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Chemical Compounds from Seaweeds on the Tropical Coast of Brazil

Abstract

Seaweeds have been explored by humans for thousands of years as a source of chemical compounds. This study describes the content of minerals, ash, carbohydrates, protein, lipids, and main metabolites of dichloromethane / methanol extracts of the seaweed Ulva lactuca, Padina gymnospora, Palisada perforata and Gelidiella acerosa from sandstone reefs on the Brazilian tropical coast (Pernambuco, Northeastern of Brazil). The content (% dry weight) of carbohydrates ranged from 14.35-48.52, proteins 7.49-14.98, total lipids 0.40-8.92, and ash 18.51-37.02. The concentration (mg kg dry algae−1) of Ca (900-3468), Mg (1655-4902), K (810-1707), Na (1062-4580), Mn (19-4462), and Cu (3.6-6.4) were maximum in Palisada and minimum in Padina. In turn, the lowest and highest contents (mg kg dry algae−1) of Fe (100-2312), Zn (18-43), and Cr (0.08-0.93) were recorded in Gelidiella and Ulva, respectively. Neophytadiene was the major compound. Phytol and palmitic acid were found in all seaweeds, although in low quantities. Palisada had the highest contents (% dry weight) of metabolites (neophytadiene: 23.89, phytol: 8.29; palmitic acid: 8.32), while Ulva had the lowest, except phytone, which was present only in this species. Our findings highlight the potential of these macroalgae from the coastal reefs as a source of chemical compounds.

Keywords:
benthic seaweeds; lipid metabolites; sandstone reefs; tropical coast


Introduction

Humans have been using seaweed for more than 14,000 years as food or medicine. Dillehay et al.11 Dillehay, T. D.; Ramirez, C.; Pino, M.; Collins, M. B.; Rossen, J.; Pino-Navarro, J. D.; Science 2008, 320, 784. [Crossref]
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For maintenance in harsh natural conditions, seaweeds produce a variety of unique metabolites, which have a wide range of commercial and industrial applications.2828 Leandro, A.; Pereira, L.; Gonçalves, A. M. M.; Mar. Drugs 2019, 18, 17.[Crossref]
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Seaweed extracts also tend to have high concentrations of secondary metabolites (phenolic and halogenated compounds, sterols, and terpenes) that have antioxidant, anti-inflammatory, anti-cancer, antiviral, bactericide, anti-fungal, and immune-modulating properties.3333 Anjali, K. P.; Sangeetha, B. M.; Devi, G.; Raghunathan, R.; Dutta, S.; J. Photochem. Photobiol., B 2019, 200, 111622. [Crossref]
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The vastness and great biodiversity of the oceans have meant that every day more researchers have been moving away from terrestrial to the marine ecosystem looking for unique therapeutic molecules with high pharmaceutical and biotechnological potentials.3737 Giddings, L.-A.; Newman, D. J.; Bioactive Compounds from Marine Extremophiles; Springer Cham: Switzerland, 2025., 3838 Chukwudulue, U. M.; Barger, N.; Dubovis, M.; Luzzatto Knaan, T.; Mar. Drugs 2023, 21, 569. [Crossref]
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Despite the toxicity of some macroalgae3939 Kumar, M. S.; Sharma, S. A.; Crit. Rev. Food Sci. Nutr. 2021, 61, 500. [Crossref]
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several species have non-toxic, edible, inexpensive, and easy-to-grow properties, making them excellent candidates for a source of compounds for human use.4343 Lomartire, S.; Gonçalves, A. M. M.; Mar. Drugs 2022, 20, 385. [Crossref]
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Nearly 427 seaweed species are known to produce marine natural products (MNPs), and from these, more than 3129 compounds have been discovered (Rhodophyta, 1658 MNPs or 53% of the total; Ochrophyta, 1213 MNPs; 39%; Chlorophyta, 258 MNPs; 8%).4444 Leal, M. C.; Munro, M. H. G.; Blunt, J. W.; Puga, J.; Jesus, B.; Calado, R.; Rosa, R.; Madeira, C.; Nat. Prod. Rep. 2013, 30, 1380. [Crossref]
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Seaweed-derived compounds have been used as functional ingredients to boost the nutritional value of food,55 Gamero-Vega, G.; Palacios, M.; Quitral, V.; A; Gaubert, J.; J. Food Nutr. Res. 2020, 8, 431. [Crossref]
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and to produce high-value cosmetics,4545 Morais, T.; Cotas, J.; Pacheco, D.; Pereira, L.; Cosmetics 2021, 8, 8. [Crossref]
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and have shown active properties such as anticancer,4646 Matulja, D.; Vranješević, F.; Kolympadi Markovic, M.; Pavelić, S. K.; Marković, D.; Molecules 2022, 27, 1449. [Crossref]
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antidiabetic,4747 Agarwal, S.; Singh, V.; Chauhan, K.; Crit. Rev. Food Sci. Nutr. 2023, 63, 5739. [Crossref]
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antifungal,3333 Anjali, K. P.; Sangeetha, B. M.; Devi, G.; Raghunathan, R.; Dutta, S.; J. Photochem. Photobiol., B 2019, 200, 111622. [Crossref]
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antibacterial,4848 Aravinth, A.; Dhanasundaram, S.; Perumal, P.; Vengateshwaran, T. D.; Thavamurugan, S.; Rajaram, R.; Biomass Conver. Biorefin. 2023, 1. [Crossref]
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antihypertensive,4949 Seca, A.; Pinto, D.; Mar. Drugs 2018, 16, 237. [Crossref]
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antiviral,5050 Lomartire, S.; Gonçalves, A. M. M.; Mar. Drugs 2022, 20, 385. [Crossref]
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immunomodulatory,5151 Pradhan, B.; Bhuyan, P.; Ki, J.-S.; Mar. Drugs 2023, 21, 300. [Crossref]
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and thyroid-stimulating.5252 Aakre, I.; Tveito Evensen, L.; Kjellevold, M.; Dahl, L.; Henjum, S.; Alexander, J.; Madsen, L.; Markhus, M. W.; Nutrients 2020, 12, 3483. [Crossref]
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Considering the potential of seaweed as a biocompound source in a world with a growing population and ever-increasing demand for products from natural origin, in particular, seaweed that could supply the protein needed by many populations while conserving natural resources,5353 Koyande, A. K.; Chew, K. W.; Manickam, S.; Chang, J. S.; Show, P. L.; Trends Food Sci. Technol. 2021, 116, 290. [Crossref]
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identifying and quantifying nutrients and bioactive compounds in marine seaweed species can be extremely valuable. The present study investigated the chemical composition of the red algae Gelidiella acerosa and Palisada perforata, the brown alga Padina gymnospora, and the green alga Ulva lactuca from sandstone reefs on the tropical Brazilian coast, aiming to quantify their minerals and metabolites, and to discuss the potential of these algae for providing bioactive compounds for use by humans.

Experimental

Study area

The study was conducted in Enseada dos Corais Beach (Pernambuco, Northeastern of Brazil). The beach is approximately 3 km long and has offshore sandstone reefs running parallel to the coastline.5454 de Vasconcelos, E. R. T. P. P.; Reis, T. N. V.; Guimarães-Barros, N. C.; Bernardi, J.; Areces-Mallea, A. S.; Cocentino, A. L. M.; Fujii, M. T.; Trop. Oceanogr. 2013, 41, 84. [Crossref]
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These reefs are colonized by Ulva lactuca, Padina gymnospora, Palisada perforata, and Gelidiella acerosa, where they occur throughout the year.2626 Bérgamo, D. B.; Oliveira, D. H.; Rosa Filho, J. S.; J. South Am. Earth Sci. 2022, 120, 104051. [Crossref]
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The local climate is tropical humid, with a mean temperature of 28 ºC and two well-defined seasons. The dry season lasts from September to February, and the rainy, from March through August.5555 Bezerra, A. C.; da Costa, S. A. T.; da Silva, J. L. B.; Araújo, A. M. Q.; Moura, G. B. A.; Lopes, P. M. O.; Nascimento, C. R.; Ver. Bras. Meteor. 2021, 36, 403. [Crossref]
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The tidal regime is of the mesotidal semi-diurnal type, with tide heights ranging from 0.7 m (neap tide) to 2.5 m, on the spring tide.5656 Pereira, P. S.; de Araújo, T. C. M.; Manso, V. A. V. In Coastal Research Library, 1st ed., Springer: Cham, Switzerland, 2016, ch. 17.

Materials and methods

Sample collection and identification

Samples of red algae Gelidiela acerosa and Palisada perforata, the brown algae Padina gymnospora, and the green algae Ulva lactuca (approximately 1 kg of fresh alga per species) were collected randomly by hand from the intertidal zone of the sandstone reefs during the low spring tide in December 2018 (SISBIO (Research Authorization in Federal Conservation Units (FUCs)) license number: 66638-3). After collection, the samples were washed thoroughly in seawater to remove the attached fauna, epiphytes, and sand particles, and then stored on ice in a cooler for transportation to the laboratory. The macroalgae species were identified based on Joly and Pereira,5757 Joly, A. B.; Pereira, S. M. B.; Trop.Oceanogr. 1972, 13, 271. [Crossref]
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Littler and Littler,5858 Littler, D. S.; Littler, M. M.; Caribbean Reef Plants. An Identification Guide to the Reef Plants of the Caribbean, Bahamas, Florida and Gulf of Mexico, 1st ed.; Off Shore Graphics, Inc: Florida, USA, 2000. Pedrini5959 Pedrini, A. G.; Macroalgas (Ocrófitas Multicelulares) Marinhas do Brasil, 1st ed.; Technical Books Editora: Rio de Janeiro, Brasil, 2013. and Guiry and Guiry.2323 Guiry, M. D.; Guiry, G. M.; National University of Ireland, Galway, https://www.algaebase.org, accessed on May 28, 2024.
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Preparation of the seaweed for chemical analysis

In the laboratory, the samples were washed under running water to remove the salt, dried at room temperature, and ground to a fine powder. The investigation of the metabolites (carbohydrates, protein and lipids) was carried out following the procedures described in “Determination of the ash”; “Determination of the minerals”; “Carbohydrates”; “Protein” and “Lipids” sub-sections. For major metabolites, samples of the seaweed powder were extracted using a 2:1 solution of dichloromethane (Neon, Suzano, Brazil) and methanol (Neon, Suzano, Brazil). After 72 h, the extracts were filtered, and the solvent was removed by evaporation under reduced pressure and a maximum temperature of 40 °C in a rotary evaporator. The dried extracts were subsequently analyzed as described in “Determination of the major metabolites” sub-section. The percentage yield of the extracts of each seaweed was calculated based on the algae dry weight.

Determination of the ash

The ash content was quantified as described by Robledo and Freile-Pelegrin,6060 Robledo, D.; Freile-Pelegrín, Y.; Bot. Mar. 1997, 40, 301. [Crossref]
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with modifications. Samples of 2 g were calcined at 300 °C for ca. 1 h, and then, at 800 °C for 2 h. At the end of the process, the crucibles containing the ash were cooled in a desiccator, and the mass of the ash (g) was determined by the equation 1:

(1) Total ash = acm crm

where, acm is the ash mass (g) plus the crucible mass (g), and crm is the crucible mass (g).

Determination of the minerals

The amount of Ca, Mg, Fe, Cu, Zn, Mn, and Cr was determined by dissolving 2.0 g of the dried seaweed biomass in 10 mL of 2% nitric acid (Neon, Suzano, Brazil), which was then quantified in a Shimadzu AA-6300 atomic absorption spectrophotometer (Shimadzu Scientific Instruments, Columbia, USA). The Na and K content was determined in a DM-61 Digimed Flame Photometer (Digimed, Vila Gea, Brazil).

Determination of the metabolites (carbohydrates, protein and lipids)

Carbohydrates

Soluble carbohydrates were extracted from the dry seaweed biomass using 5% trichloroacetic acid (Merck, Darmstadt, Germany) and the concentrations were determined by the phenolic sulphuric acid colorimetric method described by Dubois et al.6161 Dubois, M.; Gilles, K. A.; Hamilton, J. K.; Rebers, P. T.; Smith, F.; Anal. Chem. 1956, 28, 350. [Crossref]
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The percentage of soluble carbohydrates (% dry weight) was calculated based on the absorption at 490 nm in a UV-Vis spectrophotometer HP 8452 (Hewlett-Packard/Agilent technologies, Santa Clara, CA, United States), which was compared to a glycogen standard.

Protein

The protein content (% dry weight) of the dry seaweed biomass was determined using the method described by Kjedahl. The total nitrogen was multiplied by factor 6.25.6262 Horwitz, W.; Latimer, G. W.; Official Methods of Analysis of AOAC International, 18th ed.; AOAC International, 2005.

Lipids

The lipid content (% dry weight) of the dry seaweed biomass was determined by extraction in a Soxhlet apparatus for 8 h, using petroleum ether (Sigma-Aldrich, Barueri, Brazil) as the solvent. The extracted material was dried in an oven at 105 ± 2 °C until reaching a constant weight (determined gravimetrically).

Determination of the major metabolites

The samples were analyzed in a Shimadzu gas chromatograph (GC-2010) coupled to a Shimadzu mass spectrometer (GCMS-QP2010 Ultra) (Shimadzu, Kyoto, Japan) equipped with a 30 m long RTX-5MS capillary column, with an internal diameter of 0.25 mm and film thickness of 0.25 μm. The carrier gas was helium 5.0 (purity: 99.9990%) with a flow rate of 1 mL min−1. The starting oven temperature was 40 °C, with an initial heating ramp of 5 °C min−1 to 220 °C and 20 °C min−1 to 280 °C. The injection mode was spitless, with 1 µL being injected. The run lasted 25 min. The mass spectra were obtained by 70 eV electron impact ionization (EI), with the ion source being maintained at a temperature of 250 °C. The NIST08, NIST08+S, and FFNSC 1.3 databases were used for comparison, complying with a minimum similarity of 90%. Substances with a concentration over 5% were considered to be majority compounds. To express the data, the chromatographic peak areas were used to determine relative peak area (%).

Statistical analysis

A one-way analysis of variance (ANOVA) was applied to compare the amount of minerals, ash and metabolites in different seaweed species (fixed factor), using data log (x+1) transformed. When the ANOVA results were significant, a Tukey’s post hoc test was applied for pairwise comparisons. These analyses were run in Statistica® 12,6363 Statistica, version 12.0, Data Analysis Software System; StatSoft Inc., Tulsa, USA, 2013. [Link] accessed in July 2024
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and a significance level of 95% was considered in all cases.

Results

The yields of the crude extracts from the four algal species are shown in Table 1. Patisada perforata had the highest yield (1.9%), followed by Getidietta acerosa (1.2%), Padina gymnospora (1.1%), and Utva tactuca (0.7%).

Table 1
Percentage yield of the crude extracts of Ulva lactuca, Padina gymnospora, Palisada perforata, and Gelidiella acerosa from coastal sandstone reefs on the tropical Brazilian coast (Pernambuco, Northeastern of Brazil)

Metabolites (carbohydrates, protein, lipids) and ash

The content of carbohydrates (F = 1202.7, p < 0.01), proteins (F = 88.2, p < 0.01), lipids (F = 2408.4, p < 0.01), and ash (F = 385.5, p < 0.01) varied significantly among the four seaweed species (Figure 1). Significantly lower amounts of all these metabolites were found in the brown alga P. gymnospora, while the red algae P. perforata had significantly more carbohydrates and lipids than the other species. The highest protein content was recorded in P. perforata, and U. lactuca, and P. perforata also contained significantly more ash than the other species (Figure 1).

Figure 1
Amount (mean ± standard deviation) of metabolites in Ulva lactuca, Padina gymnospora, Palisada perforata, and Gelidiella acerosa from coastal sandstone reefs on the tropical Brazilian coast (Pernambuco, Northeastern of Brazil). Distinct letters indicate significant differences.

Minerals

Except for Cr (F = 1.34, p = 0.33), the concentrations of all the minerals varied significantly among seaweed species (Figure 2). The greatest variation was recorded in Ca (F = 2135, p < 0.01), Mg (F = 2512, p < 0.01), Fe (F = 60087, p < 0.01), Na (F = 3721, p < 0.01), and Mn (F = 290549, p < 0.01). Less pronounced but still significant variation was recorded in K (F = 1983, p < 0.01), Cu (F = 124.8, p < 0.01), and Zn (F = 37.33, p < 0.01). In general, maximum contents of most minerals (Ca, Mg, Na, K, Mn, Cu) occurred in P. gimnospora. U. lactuca had extremely high amounts of Fe and Zn (Figure 2).

Figure 2
Amount (mean ± standard deviation) of minerals in Ulva lactuca, Padina gymnospora, Palisada perforata, and Gelidiella acerosa from coastal sandstone reefs on the tropical Brazilian coast (Pernambuco, Northeastern of Brazil). Distinct letters indicate significant differences.

Major metabolites

The major chemical groups were terpenes and fatty acids. Neophytadiene, phytol, and palmitic acid were recorded in all species, and neophytadiene was the major compound. Palisada perforata had the highest concentrations of major metabolites (neophytadiene: 23.89% dry weight, phytol: 8.29% dry weight; palmitic acid: 8.32% dry weight), while U. lactuca had the lowest concentrations, except for phytone, which was present only in this species (Figure 3 and Table 2).

Figure 3
Chemical structures of the major metabolites in Ulva lactuca, Padina gymnospora, Palisada perforata, and Gelidiella acerosa from coastal sandstone reefs on the tropical Brazilian coast (Pernambuco, Northeastern of Brazil).

Table 2
Major compounds, retention time (tR), and concentration (% seaweed dry weight) of major metabolites in Ulva lactuca, Padina gymnospora, Palisada perforata, and Gelidiella acerosa from coastal sandstone reefs on the tropical Brazilian coast (Pernambuco, Northeastern of Brazil)

Discussion

The four seaweed species, Ulva lactuca, Padina gymnospora, Palisada perforata, and Gelidiella acerosa, from the sandstone reefs of Enseada dos Corais, on the Brazilian tropical coast, have very distinct chemical composition. Seaweeds produce metabolites in response to both abiotic and biotic factors,2929 Biris-Dorhoi, E.-S.; Michiu, D.; Pop, C. R.; Rotar, A. M.; Tofana, M.; Pop, O. L.; Socaci, S. A.; Farcas, A. C.; Nutrients 2020, 12, 3085. [Crossref]
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, 3535 Belghit, I.; Rasinger, J. D.; Heesch, S.; Biancarosa, I.; Liland, N.; Torstensen, B.; Bruckner, C. G.; Algal Res. 2017, 26, 240. [Crossref]
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and the chemical composition of these organisms is known to vary according to genetic variation, geographic distribution, and environmental conditions, such as salinity, temperature, luminosity, and growth habitats.3232 Marinho-Soriano, E.; Fonseca, P. C.; Carneiro, M. A. A.; Moreira, W. S. C.; Bioresour. Technol. 2006, 97, 2402. [Crossref]
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, 3636 Vinuganesh, A.; Kumar, A.; Korany, S. M.; Alsherif, E. A.; Selim, S.; Prakash, S.; Beemster, G. T. S.; AbdElgawad, H.; Biomolecules 2022, 12, 1475. [Crossref]
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, 6464 de Vasconcelos, E. R. T. P. P.; Vasconcelos, J. B.; Reis, T. N. V.; Cocentino, A. L. M.; Mallea, A. J. A.; Martins, G. M.; Neto, A. I.; Fujii, M. T.; J. Appl. Phycol. 2019, 31, 893. [Crossref]
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Despite occupying the same reefs, the studied species belong to different phyla, being probably the principal determinant of the differences observed in their chemical composition, as already observed in other studies comparing chemical compounds in brown, red, and green algae.6565 Kumar, M.; Gupta, V.; Kumari, P.; Reddy, C. R. K.; Jha, B.; J. Food Compos. Anal. 2011, 24, 270. [Crossref]
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, 6666 Hamid, S. S.; Wakayama, M.; Ichihara, K.; Sakurai, K.; Ashino, Y.; Kadowaki, R.; Soga, T.; Tomita, M.; Planta 2019, 249, 1921. [Crossref]
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, 6767 Al Sharie, A. H.; El-Elimat, T.; Al Zu’bi, Y. O.; Aleshawi, A. J.; Medina-Franco, J. L.; J. Mol. Graph. Model. 2020, 100, 107702. [Crossref]
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Carbohydrates were the most abundant compound in all species, as is typical in seaweeds.3232 Marinho-Soriano, E.; Fonseca, P. C.; Carneiro, M. A. A.; Moreira, W. S. C.; Bioresour. Technol. 2006, 97, 2402. [Crossref]
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, 3434 Biancacci, C.; Abell, R.; McDougall, G. J.; Day, J. G.; Stanley, M. S.; J. Appl. Phycol. 2022, 34, 1661. [Crossref]
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, 6868 Rohani-Ghadikolaei, K.; Abdulalian, E.; Ng, W.-K.; J. Food Sci. Technol. 2012, 49, 774. [Crossref]
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Carbohydrates derived from seaweeds are classified into different classes, namely fucoidan, alginate, carrageenan, ulvan, laminarin, and cellulose and hemicellulose, depending on their chemical composition.6565 Kumar, M.; Gupta, V.; Kumari, P.; Reddy, C. R. K.; Jha, B.; J. Food Compos. Anal. 2011, 24, 270. [Crossref]
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Marine algae contain relatively large amounts of polysaccharides including mucopolysaccharides, and cell-wall and storage polysaccharides, which account for 4-76% of their total dry weight.6969 Usman, A.; Khalid, S.; Usman, A.; Hussain, Z.; Wang, Y.; Algae Based Polymers, Blends, and Composites, 1st ed.; Zia, K. M.; Zuber, M.; Ali, M., eds.; Elsevier: Amsterdam, Netherlands, 2017, ch. 5. [Crossref]
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Many of these carbohydrates function as either a structural component of the cell wall or as storage molecules in the plastids, which provide the energy required for various metabolic processes.7070 Khairy, H. M.; El-Shafay, S. M.; Oceanologia 2013, 55, 435. [Crossref]
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The red algae P. perforata had the highest carbohydrate content (49.7% dry weight). The taxonomic group is the principal determinant of the occurrence, composition, and structure of the carbohydrates found in marine seaweeds6969 Usman, A.; Khalid, S.; Usman, A.; Hussain, Z.; Wang, Y.; Algae Based Polymers, Blends, and Composites, 1st ed.; Zia, K. M.; Zuber, M.; Ali, M., eds.; Elsevier: Amsterdam, Netherlands, 2017, ch. 5. [Crossref]
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and each class of macroalga produces its unique compounds.7171 Rioux, L.; Turgeon, S. L.; Tiwari, B.; Troy, D. J.; The Chemical Biology of Plant Biostimulants, 1st ed.; Geelen, D.; Xu, L., eds.; Academic Press: Cambridge, USA, Massachusetts, 2020. [Link] accessed in July 2024
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Red algae have κ-carrageenan polysaccharides and agar composed of a variety of monomers.55 Gamero-Vega, G.; Palacios, M.; Quitral, V.; A; Gaubert, J.; J. Food Nutr. Res. 2020, 8, 431. [Crossref]
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,7272 Cian, R. E.; Drago, S. R.; de Medina, F. S.; Martínez-Augustin, O.; Mar. Drugs 2015, 13, 5358. [Crossref]
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Although few studies have compared the carbohydrate content of different types of seaweed, namely green, red, and brown algae,7373 Mohammadi, M.; Iran J. Fish. Sci. 2013, 12, 232. [Crossref]
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one study recorded the highest carbohydrate content in the red alga Gracillaria corticata (41.72%) and the lowest in the brown alga Colpomenia sinuosa (11.3%). Ilhami et al.7474 Ilhami, B. T. K.; Abidin, A. S.; Martyasari, N. W. R.; Kurniawan, N. S. H.; Padmi, H.; Sunarwidhi, A. L.; Widyastuti, S.; Sunarpi, H.; Prasedya, E. S.; IOP Conf. Ser.: Earth Environ. Sci. 2021, 913, 012077. [Crossref]
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obtained similar findings and concluded that red macroalgae typically have a higher carbohydrate content than either brown or green macroalgae.

The maximum protein content was recorded in the green alga U. lactuca (14.98% dry weight) and the minimum value in the brown alga P. gimnospora (1.49% dry weight). In algae, protein plays a crucial role in processes such as enzymatic catalysis, transport and storage, and mechanical sustentative control.66 Rameshkumar, G.; Ravichandran, S.; Asian Pac. J. Trop. Biomed. 2013, 3, 118. [Crossref]
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Protein content may vary considerably among species, seasons, and environmental conditions,3434 Biancacci, C.; Abell, R.; McDougall, G. J.; Day, J. G.; Stanley, M. S.; J. Appl. Phycol. 2022, 34, 1661. [Crossref]
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, 7575 Mishra, V. K.; Temelli, F.; Shacklock, P. F.; Craigie, J. S.; Bot. Mar. 1993, 36, 169. [Crossref]
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although marine macroalgae tend to contain high concentrations of essential amino acids, lectins, glycoproteins, and phycobiliproteins.3030 Echave, J.; Otero, P.; Garcia-Oliveira, P.; Munekata, P. E. S.; Pateiro, M.; Lorenzo, J. M.; Simal-Gandara, J.; Prieto, M. A.; Antioxidants 2022, 11, 176. [Crossref]
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As observed in the present study, red (12.5-35.2% dry weight) and green algae (9.6-23.3% dry weight) tend to have a higher protein content than brown algae (4.5-16.8% dry weight).3030 Echave, J.; Otero, P.; Garcia-Oliveira, P.; Munekata, P. E. S.; Pateiro, M.; Lorenzo, J. M.; Simal-Gandara, J.; Prieto, M. A.; Antioxidants 2022, 11, 176. [Crossref]
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, 3434 Biancacci, C.; Abell, R.; McDougall, G. J.; Day, J. G.; Stanley, M. S.; J. Appl. Phycol. 2022, 34, 1661. [Crossref]
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, 7676 Ibañez, E.; Cifuentes, A.; J. Sci. Food Agric. 2013, 93, 703. [Crossref]
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All studied species had a relatively low lipid content, with the highest concentrations in the red algae P. perforata (8.9% dry weight) and G. acerosa (7.43% dry weight) and the lowest in the brown alga P. gymnospora (0.4% dry weight). In general, seaweeds are not considered a rich source of lipids,7777 Ratana-Arporn, P.; Chirapart, A.; Agric. Nat. Resour. 2006, 40, 75. [Crossref]
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and tend to contain on average approximately 4% dry weight.7878 Polat, S.; Ozogul, Y.; Int. J. Food Sci. Nutr. 2008, 59, 566. [Crossref]
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, 7979 Herbreteau, D.; Brunereau, L.; Cottier, J.; Delhommais, A.; Lorette, G.; Merland, J. J.; Laffont, J.; Sirinelli, D.; J. Neuroradiol. 1997, 24, 274. [Crossref]
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The results of the present study are in partial disagreement with previous studies, such as those of Rohani-Ghadikolae et al.6868 Rohani-Ghadikolaei, K.; Abdulalian, E.; Ng, W.-K.; J. Food Sci. Technol. 2012, 49, 774. [Crossref]
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and Barot et al.,8080 Barot, M.; Kumar, J. I.; Kumar, R. N.; Natl. Acad. Sci. Lett. 2019, 42, 459. [Crossref]
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which recorded higher lipid content in green algae when compared with red and brown species. However, it is important to note that these authors studied different species from ours and used analytical methods that are also different from those used in the present study, which recommends caution when comparing results.

The ash content varied widely among the seaweed species (18.51-37.02% dry weight). High ash contents are common in seaweed,8181 Fuentes, M. M. R.; Fernandez, G. G. A.; Pérez, J. A. S.; Guerrero, J. L. G.; Food Chem. 2000, 70, 345. [Crossref]
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and values are generally around 20-25% dry weight,8282 Di Filippo-Herrera, D.A.; Hernández-Carmona, G.; Muñoz-Ochoa, M.; Arvizu-Higuera, D. L.; Rodríguez-Montesinos, Y. E.; Bot. Mar. 2018, 61, 91. [Crossref]
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, 8383 Tapia-Martinez, J.; Hernández-Cruz, K.; Franco-Colín, M.; Mateo-Cid, L. E.; Mendoza-Gonzalez, C.; Blas-Valdivia, V.; Cano-Europa, E.; J. Appl. Phycol. 2019, 31, 2597. [Crossref]
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although higher values have already been recorded (Rupérez:8484 Rupérez, P.; Food Chem. 2002, 79, 23. [Crossref]
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20.6-39.3% dry weight; Mohammadi et al.:7373 Mohammadi, M.; Iran J. Fish. Sci. 2013, 12, 232. [Crossref]
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15.84-33.68% dry weight; Jeliane et al.:8585 Jeliani, Z. Z.; Yousefzadi, M.; Kokabi, M.; Sorahinobar, M.; Sourinejad, I.; Malik, S.; J. Aquat. Food Prod. Technol. 2022, 31, 71. [Crossref]
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31-36% dry weight). Most algae have a greater ash content than terrestrial plants, and some of the trace elements found in seaweeds are rare or absent in terrestrial plants.2424 Wynne, M. J.; Checklist of Benthic Marine Algae of the Tropical and Subtropical Western Atlantic, 5th ed.; J. Cramer Verlag: Stuttgart, Germany, 2022. The ash content of a plant tends to correlates with its mineral content,6565 Kumar, M.; Gupta, V.; Kumari, P.; Reddy, C. R. K.; Jha, B.; J. Food Compos. Anal. 2011, 24, 270. [Crossref]
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, 8686 Siddique, M. A. M.; Aktar M.; Khatib, M. A. B. M.; J. Fishscicom 2013, 7, 178. [Crossref] [Link] accessed in July 2024
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, 8787 Praiboon, J.; Palakas, S.; Noiraksa, T.; Miyashita, K.; J. Appl. Phycol. 2018, 30, 101. [Crossref]
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as observed in the present study. The ash of edible seaweed is known to contain larger amounts of macrominerals (8.083-17.875 mg 100 g−1; Na, K, Ca, Mg) and trace elements (5.1-15.2 mg 100 g−1; Fe, Zn, Mn, Cu) than edible terrestrial plants.2828 Leandro, A.; Pereira, L.; Gonçalves, A. M. M.; Mar. Drugs 2019, 18, 17.[Crossref]
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, 8484 Rupérez, P.; Food Chem. 2002, 79, 23. [Crossref]
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Except for Cr, the mineral content of the different elements (Ca, Mg, Fe, Na, K, Mn, Cu, and Zn) varied significantly among the study species. These minerals play a vital role in the growth, development, and protein synthesis of seaweed8888 Huerta-Diaz, M. A.; de León-Chavira, F.; Lares, M. L.; Chee-Barragán, A.; Siqueiros-Valencia, A.; Appl. Geochem. 2007, 22, 1380. [Crossref]
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, 8989 Ismail, G. A.; FoodSci. Technot. 2017, 37, 294. [Crossref]
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and the availability of these nutrients can affect the production of metabolites by marine algae.9090 Gaubert, J.; Payri, C. E.; Vieira, C.; Solanki, H.; Thomas, O. P.; Sci. Rep. 2019, 9, 993. [Crossref]
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Seaweeds can absorb minerals selectively from the seawater and accumulate them in their thallus.9191 Azmat, R.; Uzma; Uddin, F.; Asian J. Ptant. Sci. 2006, 6, 42. [Crossref]
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In general, the composition and concentrations of minerals found in seaweeds are species and location specific.6868 Rohani-Ghadikolaei, K.; Abdulalian, E.; Ng, W.-K.; J. Food Sci. Technol. 2012, 49, 774. [Crossref]
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Minerals such as Ca, Mg, K, and Na are important for the development of the plant and are generally present in larger quantities in marine algae than in freshwater species.9292 Nisizawa, K.; Seaweeds Kaiso Bountifut Harvestfrom the Teas. Sustenance for Heatth and Wett-Being by Preventing Common Life-Styte Retated Diseases, 1st ed.; Japan Seaweed Association: Tosa, Japan, 2002. [Link] accessed in July 2024
Link...

The metabolites groups in the present study were terpenes (neophytadiene and phytol) and fatty acids (palmitic acid), although both groups varied considerably in their abundance among the different seaweed species. The red algae P. perforata had a higher content of these metabolites in comparison with the green alga U. lactuca. Both chemical groups are typical of seaweeds9393 Kim, S.-K.; Pangestuti, R. In Advances in Food and Nutrition Research Marine Medicinat Foods: Imptications and Apptications, Macro andMicroatgae, vol. 64; Kim, S.-K., ed.; Elsevier, 2011, ch. 9, p. 11-128. [Crossref]
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, 9494 Andrade, P. B.; Barbosa, M.; Matos, R. P.; Lopes, G.; Vinholes, J.; Mouga, T.; Valentão, P.; Food Chem. 2013, 138, 1819. [Crossref]
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, 9595 Teixeira, T. R.; Santos, G. S.; Turatti, I. C. C.; Paziani, M. H.; von Zeska Kress, M. R.; Colepicolo, P.; Debonsi, H. M.; Potar. Biot. 2019, 42, 1431. [Crossref]
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and neophytadiene, phytol, and palmitic acid often comprise the major compounds of terpenes and fatty acids in these organisms.1212 dos Santos, G. S.; Rangel, K. C.; Teixeira, T. R.; Gaspar, L. R.; Abreu-Filho, P. G.; Pereira, L. M.; Yatsuda, A. P.; Gallon, M. E.; Gobbo-Neto, L.; da Costa Clementino, L.; Graminha, M. A. S.; Jordão, L. G.; Pohlit, A. M.; Colepicolo-Neto, P.; Debonsi, H. M.; Planta Med. Int. Open 2020, 7, e122. [Crossref]
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, 9696 Abdel-Aal, E. I.; Haroon, A. M.; Mofeed, J.; Egypt. J. Aquat. Res. 2015, 41, 233. [Crossref]
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In general, this metabolites are excretory produced under stressful conditions, such as exposure to ultraviolet radiation, shifts in temperature and salinity, and pressures from competitors and herbivores,9090 Gaubert, J.; Payri, C. E.; Vieira, C.; Solanki, H.; Thomas, O. P.; Sci. Rep. 2019, 9, 993. [Crossref]
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, 9797 Verges, A.; Paul, N. A.; Steinberg, P. D.; Ecotogy 2008, 89, 1334. [Crossref]
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, 9898 Uhrich, A. V.; Córdoba, O. L.; Flores, M. L.; Ars Pharm. 2016, 57, 67. [Crossref]
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and are predominantly phenolic and halogenated compounds, sterols, terpenes, and small peptides.9999 Stengel, D. B.; Connan, S.; Popper, Z. A.; Biotechnot. Adv. 2011, 29, 483. [Crossref]
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, 100100 Rosa, G. P.; Tavares, W. R.; Sousa, P. M. C.; Pages, A. K.; Seca, A. M. L.; Pinto, D. C. G. A.; Mar. Drugs 2019, 18, 8. [Crossref]
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Neophytadiene and phytol are the predominant terpenes in many types of seaweed, and their potential industrial applications have been the focus of several studies.1212 dos Santos, G. S.; Rangel, K. C.; Teixeira, T. R.; Gaspar, L. R.; Abreu-Filho, P. G.; Pereira, L. M.; Yatsuda, A. P.; Gallon, M. E.; Gobbo-Neto, L.; da Costa Clementino, L.; Graminha, M. A. S.; Jordão, L. G.; Pohlit, A. M.; Colepicolo-Neto, P.; Debonsi, H. M.; Planta Med. Int. Open 2020, 7, e122. [Crossref]
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, 101101 Aziz, S. D. A.; J. Oit Patm Res. 2019, 31, 238. [Crossref]
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Phytol is an isoprenoid compound derived primarily from chlorophyll,102102 de Moraes, J.; de Oliveira, R. N.; Costa, J. P.; Junior, A. L. G.; de Sousa, D. P.; Freitas, R. M.; Allegretti, S. M.; Pinto, P. L. S.; PLoSNegt.Trop. Dis. 2014, 8, e2617. [Crossref]
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and is known to have antinociceptive, antioxidant,103103 Santos, C. C. M. P.; Salvadori, M. S.; Mota, V. G.; Costa, L. M.; de Almeida, A. A. C.; de Oliveira, G. A. L.; Costa, J. P.; de Sousa, D. P.; de Freitas, R. M.; de Almeida, R. N.; Neurosci. J. 2013, 2013, 1. [Crossref]
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, 104104 Santos, S. A. O.; Vilela, C.; Freire, C. S. R.; Abreu, M. H.; Rocha, S. M.; Silvestre, A. J. D.; Food Chem. 2015, 183, 122. [Crossref]
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antimicrobial,3333 Anjali, K. P.; Sangeetha, B. M.; Devi, G.; Raghunathan, R.; Dutta, S.; J. Photochem. Photobiol., B 2019, 200, 111622. [Crossref]
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and immunostimulatory activity in humans.105105 Venkata Raman, B.; Samuel, L. A.; Saradhi, M. P.; Rao, B. N.; Krishna, N. V.; Sudhakar, M.; Radhakrishnan, T. M.; Asian J. Pharm. Ctin. Res. 2012, 5, 99. [Crossref]
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Like phytol, neophytadiene is a diterpene with known antibacterial3333 Anjali, K. P.; Sangeetha, B. M.; Devi, G.; Raghunathan, R.; Dutta, S.; J. Photochem. Photobiol., B 2019, 200, 111622. [Crossref]
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and antioxidant activity.106106 Santos, S. A. O.; Trindade, S. S.; Oliveira, C. S. D.; Parreira, P.; Rosa, D.; Duarte, M. F.; Ferreira, I.; Cruz, M. T.; Rego, A. M.; Abreu, M. H.; Rocha, S. M.; Silvestre, A. J. D.; Mar. Drugs 2017, 15, 340. [Crossref]
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Bhardwaj et al.1111 Bhardwaj, M.; Sali, V. K.; Mani, S.; Vasanthi, H. R.; Inflammation 2020, 43, 937. [Crossref]
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also found that neophytadiene extracted from the brown macroalga Turbinaria ornata significantly inhibited the production of nitric oxide and inflammatory cytokines in in vivo and in vitro experiments.

Palmitic acid is the most abundant saturated fatty acid found in green, brown, and red algae.6868 Rohani-Ghadikolaei, K.; Abdulalian, E.; Ng, W.-K.; J. Food Sci. Technol. 2012, 49, 774. [Crossref]
Crossref...
This compound has known antioxidant, antifungal, and antibacterial activity,3333 Anjali, K. P.; Sangeetha, B. M.; Devi, G.; Raghunathan, R.; Dutta, S.; J. Photochem. Photobiol., B 2019, 200, 111622. [Crossref]
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, 4848 Aravinth, A.; Dhanasundaram, S.; Perumal, P.; Vengateshwaran, T. D.; Thavamurugan, S.; Rajaram, R.; Biomass Conver. Biorefin. 2023, 1. [Crossref]
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and may protect the seaweed against physical, chemical, and biological stressors.88 Vasconcelos, J. B.; Vasconcelos, E. R. T. P. P.; Urrea-Victoria, V.; Bezerra, P. S.; Cocentino, A. L. M.; Navarro, D. M. A. F.; Chow, F.; Fujii, M. T.; J. Phycol. 2021, 57, 1045. [Crossref]
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While phytone was found only in U. lactuca in the present study, it has been observed in other species of green, red, and brown macroalgae.107107 Kajiwara, T.; Hatanaka, A.; Kodama, K.; Ochi, S.; Fujimura, T.; Phytochemistry 1991, 30, 1805. [Crossref]
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, 108108 Kajiwara, T.; Kashibe, M.; Matsui, K.; Hatanaka, A.; Phytochemistry 1990, 29, 2193. [Crossref]
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The presence of this compound may be the result of the hydrolysis of chlorophyll or bacteriochlorophyll-a photoproducts109109 Marchand, D.; Rontani, J.-F.; Org. Geochem. 2003, 34, 61. [Crossref]
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, 110110 Rontani, J.-F.; Rabourdin, A.; Marchand, D.; Aubert, C.; Lipids 2003, 38, 241. [Crossref]
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or the biodegradation of phytol.111111 Aladić, K.; Jokić, S.; Živković, D.; Jerković, I.; Cikoš, A.-M.; Croatian J. Food Sci. Technot. 2022, 14, 224. [Crossref]
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, 112112 Rontani, J.-F.; Acquaviva, M.; Chemosphere 1993, 26, 1513. [Crossref]
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Conclusions

The chemical compounds, including minerals, ash, and metabolites, of the seaweed species Ulva lactuca, Padina gymnospora, Palisada perforata, and Gelidiella acerosa from sandstone reefs of the tropical coast of Northeastern of Brazil, are described in this study. In general, these species are rich in proteins (all four), carbohydrates (primarily the red and green algae), and lipids (the red algae in particular). The red and green algae also have high concentrations of essential minerals, while the red and brown algae have the highest concentrations of major metabolites. These findings highlight that the four studied species have considerable potential as a source of chemical compounds for human use in a world with a continuously growing population, and ever-increasing demand for food and medicine. The study also emphasizes the need for further studies to better evaluate the potential of marine seaweeds for commercial, industrial, and pharmaceutical uses, and contribute to the prospection of products from marine origin.

Acknowledgements

Nykon Craveiro is grateful to the Brazilian National Research Council (CNPq) for his PhD scholarship (grant number: 140581/2019-7). F. F. S. thanks FAPESQ (call No. 09/2021), FINEP (INCT-CiMol, grant number: 406804/2022-2) for the financial support. F. F. S. and J. S. R. F. also acknowledge CNPq for the research grants (grant numbers: 303521/2022-8 and 303609/2022-2).

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Edited by

Editor handled this article: Hector Henrique F. Koolen (Associate)

Publication Dates

  • Publication in this collection
    23 Aug 2024
  • Date of issue
    2025

History

  • Received
    13 Mar 2024
  • Accepted
    31 July 2024
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