Addition of microencapsulated soybean molasses to pasta formulations

Efeito da adição de microcápsulas do melaço de soja em massas alimentícias

ABSTRACT:

This study investigated the production of pasta with the addition of microencapsulated soybean molasses and its effect on the physicochemical, sensory, and microbiological characteristics and shelf life of the product. Three formulations were prepared, as follows: F1, control pasta; F2, pasta made with free extract; and F3, pasta made with soybean molasses microparticles, which were characterized in terms of their pH, water activity, color measurements, sensory evaluation, microbiological characterization, and shelf life via determination of the phenolic compounds remaining during a 28 day storage. The cooked pasta containing the microparticles retained 25% of the original phenolics up to 14^th day of storage, meanwhile, the raw pasta presented 15% of the original phenolics up to the 21^st day of storage. Good sensory acceptability was observed for all pasta containing the microparticles, with no differences from the control pasta; however, pasta made with free extract was less accepted when compared to the other types. The addition of microparticles did not change the microbiological profile, pH, water activity, or color of the pasta.

Key words: sensory evaluation; phenolic; microcapsules; color

RESUMO:

Este trabalho teve como objetivo desenvolver massas alimentícias adicionadas de microcápsulas de melaço de soja e avaliar o efeito das microcápsulas sobre as características físico-químicas, sensoriais, microbiológicas e vida de prateleira. As formulações das massas foram, controle (F1), com extrato livre (F2) e com microcápsulas (F3), foram realizadas as análises de pH, atividade de água, cor, análise sensorial, microbiológica e vida de prateleira dos fenólicos por 28 dias. As massas cozidas contendo microcápsulas permaneceram com 25% de fenólicos até o 14º dia, e as massas cruas com 15% de fenólicos até o 21° dia de armazenamento. As massas com microcápsulas mostraram boa aceitabilidade não diferindo da massa controle, entretanto as massas com o extrato livre mostraram menor aceitação em relação às demais. A adição das microcápsulas não alterou a parte microbiológica, pH, atividade de água e cor das massas.

Palavras-chave: análise sensorial; fenólicos; microcápsulas; cor

INTRODUCTION:

Soybean molasses is a by-product of soy protein concentrate that is manufactured for human consumption and is rich in bioactive compounds. The use of soybean molasses has economic advantages in that it involves the transformation of a by-product into a valuable product, thus contributing to the intake of bioactive compounds and commercialization by the food industry (SIQUEIRA et al., 2008).

The great challenge of the application of bioactive compounds in foods has led to various studies on microencapsulation techniques, leading to the spray drying method being considered one of the most economical and flexible processes available (SUNNY-ROBERTS & KNORR, 2009). The microencapsulation process allows the core, which contains the encapsulated material, to be isolated from the external environment and, thereby, not interact with the food matrix, thus providing greater stability and allowing the release of compounds in optimized amounts across suitable periods (ROSA et al., 2018).

The growing search of the world population for foods that bring well-being and health benefits has motivated a series of studies on this subject (SKAROVANKOVA et al., 2015). The consumption of pasta is quite significant in Brazil, due to the tendency of consumers to look for practical and easily prepared foods. Both from a nutritional and economic point of view, pasta is an appropriate substrate for enrichment with functional ingredients (PAUCAR-MENACHO et al., 2008). In this context, this study produced pasta containing soybean molasses microparticles and to evaluate the effect of the microparticles on the physicochemical, sensory, and microbiological characteristics of the pasta, as well as the shelf life of the end product.

MATERIALS AND METHODS:

Preparation of extracts and microparticles

Soybean molasses was provided from the Selecta industry (Goiania, GO). The extract was obtained using 50% cereal alcohol at a sample/solvent ratio of 1:10 (v/v), as described by CARRÃO-PANIZZI et al. (2002), with modifications. In this case, the extract was kept under constant agitation for 2 hours at room temperature (250 rpm on an orbital shaker, Tecnal TE140, São Paulo, Brazil), followed by centrifugation (Serilab MTD III Plus, São Paulo, Brazil) at 1083 g for 20 min, thus obtaining two fractions: supernatant and precipitate. The supernatant was subjected to rotary evaporation and, subsequently, 100 mL of the evaporated extract (Buchi R-3, São Paulo, Brazil) was microencapsulated using a lab-scale mini spray dryer (Buchi B-290) with a 1.5 mm feed nozzle at a flow rate of 0.45 L/h. Hi-maize^® 18% was used as the wall material at an inlet air temperature of 130 ºC.

The following formulations were prepared: control formulation F1, consisting of 130 mL water, 426 g wheat flour, 47 g egg, and 8 g salt; formulation F2, which contained the free extract, consisting of 90 mL water, 426 g wheat flour, 47 g egg, 8 g salt, and 40 mL free extract, corresponding to 66 mg of total phenolics, and formulation F3, containing the microencapsulated extract, which consisted of 140 mL water, 386 g wheat flour, 47 g egg, 8 g salt, and 40 g microparticles with extract containing 60.56 mg of phenolics.

The ingredients were mixed until obtaining a homogeneous dough, which was rolled and cut into noodles. Cooking was performed in 1:10 boiling water for 3 min, which is the time required for the central axis to disappear, as was determined by compressing the pasta between two glass slides in 30 sec intervals (AACC, 2000). The samples were packed in polyethylene packages and stored under refrigeration (4 ºC). The stability of the pasta was evaluated by determining the loss of total phenolics after 1, 7, 14, 21, and 28 days of storage.

The phenolic compounds of the microparticles were determined via the Folin-Ciocalteu method, as described by SINGLETON et al. (1999), using a spectrophotometer (Biospectro modelo SP-220, São Paulo, Brazil) at wavelength 700nm. Results were expressed as gallic acid equivalents (mg GAE/100 g sample), which were calculated using the calibration curve, Y = 0.0126x - 0.0004, R² = 0.9909, that was constructed using a gallic acid standard at concentrations ranging from 0 to 100 µL/mL. For the determination of phenolic compounds, 5 g of pasta was weighed and 50 mL of 50% cereal alcohol was added and homogenized at 700 rpm at room temperature (25 °C). After complete homogenization, the samples were subjected to an ultrasound bath for 10 min, centrifuged at 3000 rpm for 10 min, and then filtered.

The antioxidant capacity was determined by the ORAC (Oxygen Radical Absorbance Capacity) method, as described by OU et al. (2001), using a spetrophotometer (Biospectro modelo SP-220, São Paulo, Brazil) at wavelength 700 nm, and the results were compared with a standard Trolox curve (0-96 μmol L^-1) and expressed as μmol Trolox equivalents/g sample. The ORAC was calculated as follows:

$\mathit{AUC}=1+\raisebox{1ex}{$f1$}\!\left/ \!\raisebox{-1ex}{$f0$}\right.+\raisebox{1ex}{$f2$}\!\left/ \!\raisebox{-1ex}{$f0$}\right.+\raisebox{1ex}{$f3$}\!\left/ \!\raisebox{-1ex}{$f0$}\right.+\dots \raisebox{1ex}{$\mathit{fn}$}\!\left/ \!\raisebox{-1ex}{$f0$}\right.$

where, f1...fn indicates the fluorescence determined every minute and f0 denotes the fluorescence at time zero.

The pH was measured using a previously calibrated (buffer solutions pH 4.0 and 7.0) potentiometer (Digimed^® DM-22, São Paulo, Brazil). For the determination of water activity (aw), an Aqualab^® 4TEV apparatus (Decagon Devices, Pullman, WA, USA) was used. The color was analyzed according to the CIELab system, measuring the parameters L^*, a^*, and b^*, in which L^* determines the position of the point on the vertical axis of brightness, a^* indicates the point on the (-) green/red (+) axis, and b^* denotes the corresponding point on the blue/yellow (+) axis (+), using the Minolta CR-300 colorimeter (Konica Minolta, Osaka, Japan, 1994).

The microbiological and physicochemical characterization of the fresh pasta was performed according to the methodologies of the Brazilian Normative Instruction # 62, and Resolution RDC # 12, respectively (BRAZIL, 2001).

The sensory evaluation of the samples was performed after 7 days of storage at 4 ± 1 °C. The pasta was cooked in salted cooking water, and 10 g of the sample was served in a monadic way on disposable white plates coded with random three-digit numbers; drinking water was also supplied for palate cleansing. One hundred untrained consumers, recruited at the Center of Rural Sciences at UFSM, participated in the sensory analysis. The affective test was used to evaluate the acceptance of the products (MONTEIRO, 1984) in terms of the attributes of color, odor, flavor, texture, and overall appearance, using a 7-point structured hedonic scale with the ends anchored by dislike very much (1) and liked very much (7).

Data were submitted to analysis of variance (ANOVA), followed by Tukey’s test for comparison of means. Results were considered significant when P < 0.05. Statistical analyses were performed using STATISTICA version 7.0 (StatSoft Inc, Tulsa, OK, USA).

RESULTS AND DISCUSSION:

Phenolic compounds in the free and microencapsulated soybean molasses extracts.

The total phenolic content in the free soybean molasses extract was 167.49 ± 0.02 mg GAE/100 g, and the antioxidant activity was 191.02 ±0.96 µmol Trolox/g. The microparticles exhibited 30.28 ± 0.03 µmol Trolox/g and antioxidant activity of 90.03 ±0.17 µmol Trolox/g, corresponding to the amount of extract used during the microencapsulation process, thus obtaining a total of 20 g of microparticles.

The microencapsulation resulted in retention of 20% of the phenolic compounds present in the initial extract, probably due to the high temperatures used in the spray drying process, as phenolic concentrations in soybean products have been shown to depend on the processing conditions, especially temperature (ZHANG et al., 2003). It is also noted that the antioxidant activity decreased with the microencapsulation process.

Although, the microencapsulation process led to a high degradation of bioactive compounds, use of Hi-maize^® as an encapsulating agent allowed greater encapsulation efficiency, yielding 20 g capsules per 100 mL of encapsulated extract. Encapsulation efficiency is defined by the amount of compound trapped within the microcapsule and depends on the inlet air temperature, encapsulating agent, and the affinity between the encapsulating agent and the compound to be encapsulated, among other factors (KISSEL et al., 2006).

As shown in table 1, the pH of pasta gradually decreased during storage, while the water activity remained stable. Although, the phenolic content of both the raw pasta with free extract and with the microparticles decreased during storage, the pasta containing the microparticles exhibited higher phenolic levels at the end of the storage period. Similar behavior was observed for the cooked pasta, despite presenting higher phenolic losses after cooking. The phenolics content remained until the 14^th day of storage for both the pastas made with free extract and microparticles however, pasta containing the microparticles was more stable upon heating.

Table 1
pH, water activity, total phenolics of raw and cooked pasta during 21 days of refrigerated storage at 4 °C (±1).

--------Fresh pasta--------			------------------------------------Raw--------------------------------		Cooked
		pH	Aw	Total phenolics mg GAE/100 g	Total phenolics mg GAE/100 g
1º day	F1	6.46A±0.00	0.96A±0.00	1.02Ga±0.00	0.85Ga±0.01
	F2	6.49A±0.01	0.97A±0.00	60.28Aa±0.02	35.09Bb±0.02
	F3	6.45A±0.00	0.96A±0.00	61.92Aa±0.11	42.66AAb±0.01
7º day	F1	6.18D±0.01	0.97A±0.00	0.91Ha±0.01	0.75Db±0.02
	F2	6.23C±0.02	0.96A±0.00	55.88Ba±0.00	22.18Db±0.01
	F3	6.33B±0.01	0.96A±0.00	61.60Aa±0.01	24.67Cb±0.01
14º day	F1	6.12E±0.02	0.96A±0.00	0.86Ia±0.00	0.43Hb±0.01
	F2	6.12E±0.01	0.96A±0.00	42.23Da±0.00	8.74Fb±0.02
	F3	6.10E±0.01	0.96A±0.00	45.14Ca±0.01	10.49Eb±0.02
	F1	6.05F±0.01	0.96A±0.00	0.45Ja±0.02	0.02 Kb±0.00
21° day	F2	6.05F±0.02	0.96A±0.00	8.23Fa±0.02	0.04Jb±0.00
	F3	6.06F±0.01	0.96A±0.00	11.08Ea±0.01	0.07Ib±0.00

• Results expressed as Mean ± SD (n = 3) ^ABEqual capital letters in the same column show no significant difference by Tukey's test (P <0.05) between the different formulations. ^abEqual lowercase letters on the same line show no significant difference by the Tukey's test (P <0.05) between the same formulations and day of storage.

The concentration of phenolic compounds in both the cooked pasta made with free extract and that containing microparticles was 25% until the 14^th day of storage. Meanwhile, the raw pasta exhibited 15% of original phenolic content until the 21^st day of storage. Importantly, pasta made with the free extract presented phenolic content up to 21 days of storage, presumably due to both the refrigerated storage and the high antioxidant activity of the extract. The determination of phenolic compounds was not performed at 28 days of storage, at which time the pasta was cooked for consumption, and the cooked pasta in the present study presented very low contents of these compounds after only 21 days of storage.

Regarding the color variable L^*, values ​​ranged from 78.49 to 57.69 in the various pasta formulations (Table 2), with a darkening observed during storage. However, after 14 days, the pasta made with free extract (F2) presented higher luminosity than the pasta made with the microparticles, probably due to the high antioxidant activity of the extract. The darker coloration of the pasta may be due to the natural colors of Hi-maize and soybean molasses, which are darker (L^* 52.63).

Table 2
Color of fresh pasta after the addition of free extract and microencapsulated soybean molasses extract during 21 days of storage at 4 ° C (±1).

Days of storage	Fresh pasta formulations	----------------------------------------Color parameters------------------------------------
		L*	a*	b*
1° day	F1	78.49Aa± 1.10	7.18Ca± 0.51	21.53Ba± 0.83
	F2	71.87Ca± 0.44	8.09Ba± 0.11	23.43Aa± 0.13
	F3	73.21Ba± 1.11	10.01Aa± 0.26	23.28Aa± 0.33
7° day	F1	74.10Ab± 0.72	6.88Ba ± 0.18	18.45Bb ± 0.16
	F2	69.39Cb ± 0.70	8.59Aa ± 0.23	21.99Ab ± 0.38
	F3	70.49Bb ± 0.51	8.97Aa ± 0.13	22.05Ab ± 0.63
14° day	F1	72.94Ac ± 0.22	7.40Ca ± 0.21	18.20Bb ± 0.19
	F2	62.94Bc ± 1.83	8.99Ba ± 0.03	22.29Aab ± 0.19
	F3	60.83Cc ± 1.07	9.66Aa ± 0.19	22.83Aab ± 0.78
21º day	F1	70.08Ad ± 0.21	8.09Ca ± 0.19	18.09Bb ± 0.18
	F2	60.23Bd ± 0,23	9.13Ba ± 0.05	21.18Abc ± 0.18
	F3	57.69Cd ± 0,88	9.55Aa ± 0.17	22.27Aab ± 0.73
------------------------------Extract-------------------------		52.63D ± 0.12d	3.10D ± 0.33	9.37C ± 0.14

• Results expressed as Mean ± SD (n = 3) ^AB Equal capital letters in the same column show no significant difference by Tukey's test (P <0.05) between the different formulations. ^ab Equal lowercase letters on the same line show no significant difference by the Tukey's test (P <0.05) between the same formulations and day of storage.

The color coordinate b^*, which varies from blue to yellow, decreased on the 7^th day of storage for all formulations, with no significant differences observed between formulations until the end of storage, indicating that the pasta did not undergo oxidation. The values presented in the current study are lower than the values observed by PAUCAR-MENACHO et al. (2008), who reported b^* values of 28.41 in functional fresh pasta made with different concentrations of soy protein isolate and polydextrose.

Regarding the color coordinate a^*, no significant differences were observed during storage for across all formulations, with values remaining stable for 21 days. The coordinate a^* represents the red color and is a good indicator of color stability (RAMOS & GOMIDE, 2007).

Concerning the microbiological characterization of the different pasta formulations, all cases exhibited Bacillus cereus counts ​​ <1.0 x 10¹, coliforms at 45 ^oC <3.0 NMP/g, absence of Salmonella, and coagulase-positive staphylococci <1.0 x 10². According to the Resolution 12 of the Brazilian National Health Regulatory Agency (ANVISA, Brazil, 2001), which established microbiological criteria for food, the fresh pasta is within required standards, with maximum acceptable limits being 10² CFU/g for coliforms at 45 °C, 5x10³ CFU/g for coagulase-positive staphylococci, 5x10² CFU/g for Bacillus cereus, and the absence of Salmonella sp. in 25 g of the sample. Concerning the coliforms at 35 °C, the counts were 9x10², 9x10¹, and 4x10³ NMP/mL for the control, the formulation containing the microparticles, and the formulation containing the free extract, respectively. The counts of coliforms at 45 °C were below 10¹ CFU/g for all fresh pasta formulations.

As shown in table 3, there was no significant difference in consumer acceptance of the pasta made with the microparticles when compared to the control, with scores ranging between “liked” and “liked very much” for the attributes of flavor, texture, and appearance, thus demonstrating good acceptability. However, the pasta made with free extract (F2) was less accepted when compared to the other formulations, due to the dark color of the soybean molasses extract, which made the pasta appear darker, as well as its strong off-flavor.

Table 3
Acceptance test of different fresh pasta formulations.

Attributes	--------------------------------------------------------Fresh Pasta-----------------------------------------------------
	F1	F2	F3
Color	4.92a± 0.92	4.49b ± 1.03	5.02a ± 0.98
Odor	4.93a ± 1.02	4.87a ± 1.06	4.91a ± 0.96
Flavor	5.18a ± 1.38	4.67b ± 1.12	5.07a ± 1.02
Texture	5.22a ± 1.13	5.16a ± 1.26	5.29a ± 1.01
Appearance	5.29a ± 1.08	4.73b ± 0.89	5.16a ± 1.02

• Results expressed as Mean ± SD (n = 3) ^ab Equal lowercase letters on the same line show no significant difference by Tukey's test (P <0.05). Control formulation (F1); Formulation containing free extract (F2); Formulation containing microencapsulated extract (F3). Scores: 1 = extremely disliked; 2 = moderately disliked; 3 = disliked; 4 = indifferent; 5 = liked; 6 = liked very much; 7 = extremely liked.

CONCLUSION:

Pasta made with free extract and raw and cooked pasta containing the microparticles all exhibited losses of phenolic compounds during storage. However, cooked pasta made with either free extract or microparticles both retained 25% of their original phenolic content up to the 14^th day of storage, while raw pasta exhibited 15% original phenolic content until 21 days of storage. Although, good sensory acceptability was observed for pasta containing the microparticles, with no differences from the control, pasta made with the free extract was less accepted than the others. No changes in pH, water activity, or color were observed for pasta made with the addition of soybean molasses microparticles.

ACKNOWLEDGEMENTS

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Brasil - Finance code 001.

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• CR-2020-0722.R1

Publication Dates

• Publication in this collection
  31 May 2021
• Date of issue
  2021

History

• Received
  03 Aug 2020
• Accepted
  15 Jan 2021
• Reviewed
  03 June 2021