Some triterpenic compounds in extracts of Cecropia and Bauhinia species for different sampling years

ABSTRACT

The aim of this paper is to provide an overview on the chemical composition of triterpenes in widespread used folk medicine species, through the development and validation of eleven compounds using HPLC-UV detection. The compounds were separated using isocratic elution, on a reverse phase column (Kinetex C18, 250 mm × 4.6 mm, 5 µm) with mobile phase consisted of acetonitrile:tetrahydrofuran (90:10, v/v), flow-rate of 0.5 ml/min and detection in 210 nm. Diverse validation parameters were successfully evaluated. The samples of Bauhinia variegata L., B. variegata var. candida Voigt, Fabaceae, Cecropia palmata Willd. and C. obtusa Trécul, Urticaceae, collected in 2012, 2013 and 2014 from Amazon were treated with two different solvents (ethyl acetate and chloroform) and analyzed by the proposed method. Stigmasterol, lupeol, β-sitosterol, β-amirin and α-amirin were found in all the studied plants. Highlighting the presence of oleanolic acid, maslinic acid in C. obtusa and C. palmata extracts, erythrodiol only in C. palmata, stigmasteol in B. variegata and α-amirin in B. variegata var. candida. Overall, ethyl acetate showed better performance as the extractor solvent than chloroform. Moreover, it could be used for the quality control of medicinal plants and to assess potential marker compounds.

Keywords: HPLC-UV; Validation; Triterpenes; White and pink pata-vaca; Red and white-embaúba; Amazonian medicinal plants

Introduction

Triterpenes, presents in vegetable oils, cereals, fruits and bark of trees are widespread in the human diet (Rhourri-Frih et al., 2009; Saleem, 2009; Siddique and Saleem, 2011; Szakiel et al., 2012) and one of the largest classes of secondary metabolites, with more than 30,000 different triterpenes reported (Muffler et al., 2011; Thimmappa et al., 2014).

This large number of compounds is related to the versatility of their structure, consisted of acycles, bi-, tri-, tetra- and pentacycles (Dias et al., 2011; Muffler et al., 2011). Among those, pentacyclic triterpenes presented promising pharmacological properties (Szakiel et al., 2012; Ghosh and Sil, 2013; Shanmugam et al., 2013) such as, anti-inflammatory (Saleem et al., 2008; Martelanc et al., 2009), hepatoprotector (Kumari and Kakkar, 2012; Pollier and Goossens, 2012), anti-tumor (Saleem, 2009; Shanmugam et al., 2013), anti-viral (Sánchez-Ávila et al., 2009; Kong et al., 2013), anti-HIV (Cheng et al., 2011; Wójciak-Kosior et al., 2013), anti-microbial (Pai et al., 2011), anti-fungal (Rocha et al., 2004), anti-diabetic (Manna et al., 2010), gastroprotective (Sánchez et al., 2006; Quílez et al., 2010), anti-hyperlipidemic (Claude et al., 2004), neuroprotector (Silva et al., 2011), antiarthritic (Siddique and Saleem, 2011), antioxidant (Allouche et al., 2010), cholesterol-reducing properties (Chauhan et al., 2013), cardioprotective (Somova et al., 2003) and trypanocidal activity (Ferreira et al., 2010).

Medicinal plants have been used for centuries in folk medicine associated with health promotion, prevention and cure of human diseases (Laszczyk, 2009; Romero et al., 2010). With more than 50,000 plant species, Brazil has the greatest levels of biodiversity in the planet (Giulietti et al., 2005) and Amazonia is a region with one of the richest flora in the world with a large potential discovery and research of new drugs (Giulietti et al., 2005; Coelho-Ferreira, 2009). Despite the diversity and the widespread use of phytotherapics in Brazil the scientific knowledge about this flora properties is limited (Figueredo et al., 2014).

Bauhinia variegata L., popular known in Brazil as “pata-de-vaca” or “unha-de-boi”, member of the Fabaceae family, it has been used in popular medicine as a result of their hypoglycemic (Silva and Filho, 2002; Parekh et al., 2006; Murillo et al., 2007; Silva et al., 2007), anti-cholesterol, anti-elephantiasis (Silva et al., 2007), antibacterial (Silva and Filho, 2002; Parekh et al., 2006), anti-tumor (Rajkapoor et al., 2003), antifungal (Silva and Filho, 2002; Rajkapoor et al., 2003), diuretic, tonic, depurative activities (Pizzolatti et al., 2003), while also being useful against skin diseases and ulcers (Reddy et al., 2003) in bronchitis, leprosy (Rajkapoor et al., 2003), and in the management of inflammatory diseases (Silva and Filho, 2002; Rao et al., 2008).

Another medicinal plants included in this study is Cecropia palmata Willd. and C. obtusa Trécul, popularly known in Brazil as “embaúba-vermelha” and “embaúba-branca” from the Urticaceae family, traditional used as anti-rheumatic (Silva et al., 2007), anti-inflammatory (Rocha et al., 2007; Costa et al., 2011; Nicasio-Torres et al., 2012; Pelaez et al., 2013), anti-oxidant activities (Nicasio-Torres et al., 2012), anti-tumor (Rocha et al., 2007), act in central nervous system, including anxiolytic and antidepressant-like activities (Silva et al., 2007; Costa et al., 2011), against asthma, high blood pressure (Costa et al., 2011), as well used in the treatment of type 2 diabetes (Rocha et al., 2007; Nicasio-Torres et al., 2012; Pelaez et al., 2013).

This wide diversity of pharmacological properties reported in Cecropia and Bauhinia is related to secondary metabolites, as flavonoids, phenolic acids, carotenoids, tocopherols, alkaloids, lignans, tannins, salicylates, glucosinolates and triterpenes (Szakiel et al., 2012).

Several papers described the detection and separation of triterpenes in medicinal plants. Some methods include preparative thin-layer chromatography (TLC) (Martelanc et al., 2007; Martelanc et al., 2009), gas chromatography (GC) with derivatization step (Zhang et al., 2012), capillary electrophoresis (CE) (Cheung and Zhang, 2008; Li et al., 2011), evaporative light-scattering detectors (Lesellier et al., 2012), high-performance liquid chromatography (HPLC) (Martelanc et al., 2009; Li et al., 2011; Lesellier et al., 2012; Zhang et al., 2012) with UV detector or mass spectrometric detectors using atmospheric pressure chemical ionization (APCI) atmospheric pressure photoionization (APPI) and electrospray ionization (ESI) (Sánchez-Ávila et al., 2009). The simultaneous determination of triterpenes render a difficult task considering, their similar structure, lack of chromophores, very low UV absorption and similar polarity. According to the literature, there is only one published report that separates more than six triterpenes in a single HPLC run (Bedner et al., 2008; Martelanc et al., 2009; Sánchez-Ávila et al., 2009; Li et al., 2011; Slavin and Yu, 2012; Li et al., 2013).

In this study the development of a method for simultaneous determination of eleven triterpenes with isocratic elution and UV detection was proposed. The developed method was applied to the analysis of four different medicinal plants from the Amazon region (Cecropia obtusa, C. palmata, B. variegata and B. variegata var. candida) HPLC with UV detection.

Materials and methods

Chemicals

All the chemical standards used, α-amirin (98%), β-amirin (98.5%), β-sitosterol (85%), stigmasterol (95%), lupeol (90%), uvaol (95%), erythrodiol (97%), oleanolic acid (97%), betulinic acid (97%), arjunic acid (88%) and maslinic acid (95%) used were of analytical grade from Sigma–Aldrich (St. Louis, MO, USA). The solvents acetonitrile (ACN), methanol (MeOH) and tetrahydrofuran (THF) were of HPLC grade from Tedia (Fairfield, OH, EUA). Chloroform (CHCl₃) and ethyl acetate (EtOAc) were of analytical grade from Merck (Darmstadt, Germany). Stock solutions of α-amirin, β-amirin, uvaol, erythrodiol, oleanolic acid, arjunic acid and maslinic acid 1000 mg/l, stigmasterol 481 mg/l, lupeol 365 mg/l, betulinic acid 196 mg/l and β-sitosterol 873 mg/l were prepared in methanol. The working analytical solutions for analytical curve were obtained by diluting the analytical solutions in acetonitrile with the following concentrations 0.7, 6.5, 12.2, 18.0, 23.6, 29.3 and 35.0 mg/l. All the solutions were stored at −20 °C until analysis.

HPLC-UV analysis

Chromatographic measurements were performed on a Dionex^® model P680 (Sunnyvale, CA, USA) liquid chromatograph equipped with a UV-vis detector model UVD170U, Rheodyne^® injection valve model 8125 (Cotati, CA, USA) with loop of 100 µl. The analyses were carried out with a Kinetex reversed-phase C₁₈ column (250 mm × 4.6 mm, 5 µm particle size; Phenomenex, Torrance, CA, USA) which was preceded by a Security Guard C₁₈.pre-column (Phenomenex, Torrance, CA, USA). The mobile phase consisted of acetonitrile:tetrahydrofuran (90:10, v/v) and the flow-rate was set at 0.5 ml/min. Spectrophotometry detection of analytes was performed at 210 nm wavelengths. Evaluation and quantification were made on a Chromeleon 6.7 Workstation. The same samples were previously studied also by performing an ultra-high-performance liquid chromatography – atmospheric pressure photoionization source mass spectrometry (UHPLC-APPI-MS/MS). Therefore, a comparison of the species detected using HPLC-UV was performed by UHPLC-APPI-MS/MS, described in details by Gobo et al. (2016).

Plant material

The medicinal plant species Bauhinia variegata L. (deposit n° IAN 185932), B. variegata var. candida Voigt (deposit n° IAN 185831), Cecropia obtusa Trécul (deposit n° IAN 185555) and C. palmata Willd (deposit n° IAN 185556) were obtained from the herbal collection of the Brazilian Agricultural Research Corporation, Embrapa Amazônia Oriental, Belém, PA, Brazil. The geographical location of the collection site is 1°27′21″ S latitude and 48°30′14″ W longitude.

The Amazon region has a hot and humid characteristic climate with small temperature gradients. There are two well establish seasons in that region, a dry-period (July–October) and rainy season (December–May); the months of June and November are considered transition periods (Ananias et al., 2010). According Gobbo-Neto and Lopes (2007) there is a positive influence of rainfall on the concentration of secondary metabolites (cyanogenic glycosides, glucosinolates, terpenes, anthocyanins and alkaloids) therefore, the samples studied were collected during the rainy season in three different years (2012, 2013 and 2014).

Sample preparation and extraction procedure

The fresh plant specimens were cleaned, dried at 40 °C for 12 h, ground into a fine powder in a laboratory mill and used as a dry powdered material. All plants were received as a fine powdered dried leaf material. Dried samples were stored in desiccators under vacuum at room temperature until sample treatment.

Ultrasound-assisted extraction was performed in a reactor thermostatic water bath (temperature accuracy of ±1.0 °C). The experimental setup consists of an ultrasonic bath USC 1800A (Unique Inc., Brazil, BR) equipped with a transducer with longitudinal vibrations. The ultrasonic unit has an operating frequency of 40 kHz and a maximum-rated ultrasound power output of 132 W. The ultrasonic transducer (surface area of 282.2 cm²) is fitted at the bottom of the bath horizontally along the length of the bath (Dal Prá et al., 2015). Samples were weighed 0.5 g and placed into a conical flask, into which 10 ml of ethyl acetate or chloroform was added and sonicated for 30 min at 37 °C. Extraction was carried out three times with fresh portions of solvent in the above conditions (Pai et al., 2011; Wójciak-Kosior et al., 2013). The extract remained was dried with N₂ and dissolved in 10 ml of mobile phase. All the samples were diluted to a 2% (m/v) and filtered through Chromafil Xtra PEFT-20/25 filters from Macherey-Nagel (Düren, Germany) before injection. For construction of the calibration curves, seven different mixed solutions were injected in three replicates.

Validation procedure

The analytical method was validated for linearity, limit of detection (LOD), limit of quantification (LOQ), accuracy, precision and robustness following the RE n° 899/2003 (Anvisa, 2003). The calibration curves were prepared using seven concentrations (0.7, 6.5, 12.2, 18.0, 23.6, 29.3 and 35.0 mg/l) of the 11 stock standard solutions in the range 0.21–40 mg/l which were injected in triplicate. The mean peak areas were taken for the construction the calibration curve. The data were analyzed by linear regression least square model. The LOD and LOQ, under the presented chromatographic conditions were determined visually. The precision was determined by intra and inter-day variation and the recovery were evaluated by standard addition method, the variations were expressed by RSD % as the following formula: RSD (%) = (detected amount − original amount)/amount spiked × 100. All solutions were kept at −20 °C before analysis.

Results and discussion

HPLC analysis

Based in methods reported in the literature (Martelanc et al., 2007; Martelanc et al., 2009; Sánchez-Ávila et al., 2009; Yang et al., 2009; Li et al., 2013), chromatographic conditions were optimized in order to obtain the best separation of the analytes in the shortest time. The main variables evaluated in the chromatographic separation were ratio of the mobile phase, flow-rate of mobile phase, temperature of the operational room and detection wavelength. Table 1 shows these variables, the ranges studied and their optimum values as well as the solvents used in the optimization of the mobile phase composition.

Table 1
Optimization of the chromatographic conditions for separation of triterpenic compounds.

Variable	Tasted value	Optimum value
Flow rate (ml/min)	0.5, 0.8 and 1.0	0.5
Room temperature (ºC)	21.0 and 23.0	21.0
Composition mobile phase
MeOH:H2O	90:10 (pH 3.0) 80:20 (pH 3.0)
ACN:H2O	90:10 (pH 3.0)	ACN:THF (90:10)
THF:ACN:H2O	30:60:10
ACN:THF	90:10
Wavelength (nm)	200, 205, 210, 220 and 225	210

• ACN, acetonitrile; MeOH, methanol; THF, tetrahydrofuran; H₂O, water.

The best mobile phase was ACN/THF (90:10; v/v). The optimum flow rate and room temperature were 0.5 ml/min and 21 °C, respectively. The detection wavelength was chosen at 210 nm accordingly to experimental data (Table 2) and the literature (Holen, 1985; Schneider et al., 2009; Romero et al., 2010; Slavin and Yu, 2012; Xu et al., 2012; Zhang et al., 2012) due to better absorption at the selected wavelength. The representative chromatogram for standard solutions under the proposed conditions is shown in Fig. 1. It is noteworthy to mention that the complete separation of the eleven triterpenes could be achieved in 45 min, compared to other separation methods, it can be said that the new methodology developed separates more compounds than the others reported in literature on isocratic mode (Liu et al., 2003; Ávila et al., 2007; Razboršek et al., 2007; Cheung and Zhang, 2008).

Table 2
Molar absorptivity coefficient (ɛ) in l/mol cm of triterpenes in different wavelengths.

Compound	ɛ 200 nm	ɛ 210 nm	ɛ 220 nm
Arjunic acid	2.4·104	1.6·104	6.4·103
Betulinic acid	5.0·103	5.7·103	2.2·103
Erythrodiol	7.1·104	2.8·104	1.2·104
Lupeol	1.2·105	6.1·104	3.1·104
Maslinic acid	2.2·105	1.5·105	7.1·104
Oleanolic acid	1.6·105	9.7·104	5.4·104
Stigmasterol	1.1·105	5.0·104	2.8·104
Uvaol	1.1·105	5.1·104	2.9·104
α-Amirin	1.4·105	8.1·104	4.7·104
β-Amirin	1.3·105	4.6·104	2.4·104
β-Sitosterol	1.3·104	7.2·104	4.3·104

Fig. 1
Chromatographic separation of eleven triterpenes standard by HPLC-UV (10 mg/l) (1) arjunic acid, (2) maslinic acid, (3) betulinic acid, (4) oleanolic acid, (5) erythrodiol, (6) Uvaol, (7) lupeol, (8) β-amirin, (9) α-amirin, (10) stigmasterol and (11) β-sitosterol. Column: Kinetex C₁₈ 250 mm × 4.6 mm, 5.0 µm. Mobile phase: 90:10 ACN/THF 0.5 ml/min.

Method validation

The calibration curves showed good linearity and the correlation coefficients were found in the range of 0.990–0.996 for all of the tested compounds. The recoveries of the eleven analytes were in the range of 85–110%. The relative standard deviation (RSD) between sample measurements was used as precision, varying from 2.01 to 9.37% for intraday precision and from 1.84 to 4.04% to interday for precision. Robustness was tested in terms of flow difference (±0.1 ml/min), % mobile phase (±5% THF), and wavelength (±1 nm). The variation does not exceed 20%. Overall, these results demonstrate that the developed method has enough accuracy, precision, and sensitivity for the simultaneously quantitative analysis of the eleven compounds. The recovery results for evaluating the accuracy of the method were satisfactory according to the Anvisa (2003), which allows a range of 80–120% for amazon plants extracts. The obtained validation parameters such as correlation coefficient, linear range, recovery, LOD and LOQ are summarized in Table 3.

Table 3
Analytical parameters for the validated method by HPLC-UV.

Compound	LOD (mg/kg)	LOQ (mg/kg)	Linear range (mg/kg)	Correlation coefficient (r2)	Intra-day precision (RSD%)	Inter-day precision (RSD%)	Accuracy (%)
α-Amirin	0.37	0.75	0.74-40.0	0.996	3.60	3.21	95-110
β-Amirin	1.04	2.12	0.74-40.0	0.996	2.73	2.15	100-105
Oleanolic acid	0.22	0.43	0.74-35.0	0.990	8.92	3.65	98-102
Betulinic acid	0.09	0.20	0.74-35.0	0.996	9.38	3.40	93-97
β-Sitosterol	0.08	0.16	0.74-40.0	0.992	3.95	3.19	97-110
Stigmasterol	0.06	0.13	0.74-40.0	0.991	2.01	2.12	85-96
Lupeol	0.12	0.25	0.74-40.0	0.996	2.43	2.54	92-102
Uvaol	0.12	0.24	0.74-35.0	0.991	2.38	2.29	95-108
Arjunic acid	0.07	0.15	0.74-35.0	0.990	4.01	3.75	97-103
Maslinic acid	0.13	0.27	0.74-40.0	0.996	4.39	4.40	96-99
Erythrodiol	0.08	0.17	0.74-35.0	0.994	2.16	1.85	90-96

• LOD, limit of detection; LOQ, limit of quantification; RSD, relative standard deviation.

Application to Bauhinia samples

Previous studies in phytochemical analysis reported the presence of glycosides, triterpene, flavonoid, lactones, steroids, alkaloids, coumarins and saponins in Bauhinia species (Silva and Filho, 2002; Pizzolatti et al., 2003; Rajkapoor et al., 2003; Rao et al., 2008). Sample analysis (Fig. 2) indicated the presence of six (maslinic acid, stigmasterol, lupeol, β-sitosterol, β-amirin and α-amirin) out of the eleven compounds in the Bauhinia species. The presence of the four compounds previously listed, using the same sample, was also confirmed previously by UHPLC-APPI-MS/MS analysis (Gobo et al., 2016).

Fig. 2
Triterpenic compounds found in the Bauhinia species via HPLC-UV (A) Bauhinia variegata and (B) B. variegata var. candida.

Bauhinia variegata shows greater amounts of triterpenes in comparison with B. variegata var. candida. The use of ethyl acetate enabled to extract higher concentrations of stigmasterol (+85%), lupeol (+35%) and β-sitosterol (+13%) in comparison with the chloroform.

Application to Cecropia samples

Regarding the studied compounds, C. obtusa (Fig. 3) exhibited a greater diversity when compared to the other species of the same genus analyzed C. palmata. Among the eleven triterpenes separated in this method oleanolic acid, maslinic acid, β-amirin, stigsmasterol, lupeol and β-sitosterol were found in these samples. β-amirin, lupeol and β-sitosterol were also identified by UHPLC-APPI-MS/MS analysis (Gobo et al., 2016).

Fig. 3
Triterpenic compounds found in the Cecropia species via HPLC-UV (A) Cecropia obtusa and (B) Cecropia palmata.

Noteworthy is the presence of β-sitosterol (+55%), α-amirin (+60%), β-amirin (+60%) and oleanolic acid (+20%), increasing concentrations along the years, and the ethyl acetate was a better extract solvent than chloroform for these compounds. This observation can be a result of some environmental factors such as ultraviolet radiation, rainfall, temperature (Gobbo-Neto and Lopes, 2007).

Conclusions

A new analytical method has been developed for the simultaneous identification and quantification of triterpenes compounds using HPLC-UV and isocratic elution, to analyze these compounds in Cecropia and Bauhinia species. The HPLC-UV method is effective to separate and quantify the medicinal plants extracts with good validation parameters, such as linearity, LOD, LOQ, recovery, accuracy, precision, robustness and repeatability. Although triterpenoids contribute significantly to the bioactivity and pharmacology of Bauhinia and Cecropia, no study was reported so far for the quantitative determination of these compounds in these folk medicine plants. Triterpenes compounds such as maslinic acid, oleanolic acid, α-amirin, β-amirin and β-sitosterol were found as major compounds in chloroform and ethyl acetate extracts. Furthermore, the presence of these triterpenic compounds in the extracts reinforces the pharmacological action, and the medical use of such plants in folk medicine. Based on the results, the species with the highest variety of compounds and concentration were B. variegata and C. obtusa. The present method developed can be used in research of chemical markers in medicinal plants as well as in the quality control of herbal medicines widely used in Brazil and in folk medicine. The identified compounds in Bauhinia (lupeol, β-sitosterol, β-amirin and α-amirin), as well in Cecropia (β-amirin, lupeol and β-sitosterol) extracts were also observed and using the same sample by HPLC-APCI-MS/MS analysis, therefore, ratifying the importance of this work.

Acknowledgements

This work was supported by grants from the Brazilian Nacional Research Council CNPq, (processes 487028/2012-0 and 440132/2014-2). The authors also thank Embrapa Amazônia Oriental (Belém/PA) for supplying the medicinal plants studied.

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Publication Dates

• Publication in this collection
  Jan-Feb 2018

History

• Received
  9 Oct 2017
• Accepted
  24 Nov 2017