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Medicinal Chemistry
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Isolation and Biological Activity of the Triterpene Β-Amyrin from the Aerial Plant Parts of Maesobotrya Barteri (Baill)

Ogwuche CE1*, Amupitan JO2, NdukweIG2 and Ayo RG3

1Department of Chemistry, Federal University of Petroleum Resources Effurun, Delta State, Nigeria

2Department of Chemistry, Ahmadu Bello University, Zaria, Kaduna State, Nigeria

3Department of Agricultural Division, Ahmadu Bello University, Zaria, Kaduna State, Nigeria

*Corresponding Author:
Ogwuche CE
Department of Chemistry
Federal University of Petroleum Resources Effurun
Delta State, Nigeria
Tel: +2347037166612
E-mail: [email protected]

Received date: August 30, 2014; Accepted date: October 25, 2014; Published date: October 27, 2014

Citation: Ogwuche CE, Amupitan JO, NdukweIG, Ayo RG (2014) Isolation and Biological Activity of the Triterpene Β-Amyrin from the Aerial Plant Parts of Maesobotrya Barteri (Baill). Med chem 4:729-733. doi:10.4172/2161-0444.1000221

Copyright: © 2014 Ogwuche CE, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Abstract

Maesobotrya barteri (Baill), belonging to the family EUPHORBIACEAE, is a medicinal plant growing widely in tropical Africa. The Aerial plant parts of Maesobotrya barteri (Bail) were collected fresh from Orokam, Ogbadibo local Government of Benue State, Nigeria in July, 2013. Taxonomical identification was done by Mallam Musa Abdullahi at the Herbarium unit of Biological sciences Department, ABU, Zaria, Nigeria. Pulverized aerial parts of Maesobotrya barteri (960g) was exhaustively extracted successively using petroleum ether, chloroform, ethyl acetate and methanol and concentrated in the rotary evaporator at 40°C. The ethyl acetate fraction having the highest activity against test microbes from preliminary crude microbial screenings was subjected to phytochemical studies, antimicrobial analysis and column chromatography (CC). The column chromatography yielded fraction EN, which was further purified using preparative thin layer chromatography to give EN1. The structure of the isolated compound was established using 1-D NMR and 2-D NMR spectroscopic analysis and by direct comparism with data reported in literature was confirmed to be β-amyrin. The bioactivity of this compound was carried out using some clinical pathogens and the activity compared with standard drugs and this was found to be comparable with the standard drug.

Keywords

Maesobotrya barteri; Medicinal plant; Bioactivity; Ethylacetate extract; β-amyrin

Introduction

Maesobotrya sp is a variety of flowering plant belonging to the family Phyllanthaceae or by some authors classified in Euphorbiaceae. The Euphorbiaceae plants are shrubs, trees, herbs or rarely lianas [1]. Plants of the Euphorbiaceae are known to be rich in terpenoids (69.5%) [2].

In Nigeria, the species M. barteri is under-exploited although the tree is of both medicinal and nutritional importance [3]. Maesobotrya species are used medicinally in different regions in Africa [4]. It bears succulent black-purple fruits that are edible and stain the tongue. The nutritive values of the fruits and seeds have been studied in Southern Nigeria [5]. Thus, this study aims at validating the antimicrobial effects of the aerial plant parts of Maesobotrya barteri used in traditional medicine in Orokam town of Benue State, Nigeria, as well as potent compounds that can be used as precursors for synthetic drugs.

Plant Material

The aerial parts of Maesobotrya barteri were collected from Orokam in Ogbadibo local government area of Benue State in the month of July, 2013. They were properly identified at the herbarium, Department of Biological Sciences, Ahmadu Bello University, Zaria. The whole plant was sorted, air dried under shade, segregated and pulverized by mechanically pounding them using wooden mortar and pestle. The pulverized plant material was stored away from moisture.

Extraction

980.54g of the pulverized plant materials were carefully weighed and loaded into a Soxhlet extractor. It was extracted successively with Petroleum ether (60-80°C), Chloroform, Ethyl acetate (76-78°C) and Methanol by hot continuous percolation method in the Soxhlet apparatus for 72 hours respectively. Solvents used were those of JHD and general purpose reagentsThe extracts were concentrated in vacuo at 40°C using rotary evaporator and subjected to air drying to give dried crude extracts.

Phytochemical Screening

The crude ethyl acetate extract was subjected to phytochemical screening to test for saponins, tannins, steroids, flavonoids, alkaloids, cardiac glycosides, carbohydrates and tritepenes using standard techniques of plant secondary metabolites [6-8].

Isolation

The ethyl acetate extract was the most sensitive extract from the antimicrobial screening and was subjected to column chromatography (CC) for fractionation. Solvents used to run the column chromatograghy were sealed and are products JHD with 98% purity. Fifteen grams (15g) of the extract was dissolved in ethyl acetate and preadsorbed on 10.0g silica gel (qualikens 60-120 mesh). The dried pre-adsorbed extract was transferred to a mortar and ground to give a fine powder and was added at the uniform layer on top of the column. The petroleum ether descended on a horizontal line indicating that the column was well packed. A total of 105 fractions (50mls) each were initially collected using gradient elution with a solvent combination of petroleum ether and ethyl acetate, starting with 100% petroleum ether with an increasing polarity of 1% ethyl acetate. Similar fractions were pulled together based on monitoring from TLC. Fractions F20-F25 were pulled together at the ration of 8:2 and where subjected to further purification using Preparative thin layer chromatography to obtain a solid white amorphous substance which after several trails using different solvent combinations showed a single spot which was visible under the UV lamp and after spraying the TLC plate with 10% H2SO4 and oven dried for 5minutes at 60°C. The solid white amorphous substance produced was insoluble in ethyl acetate or petroleum ether but soluble in chloroform [9-12].

Results and Discussion

From the preliminary antimicrobial screening of the crude aerial plant parts extracts of M. barteri, ethylacetate extract exhibited the highest activity against the test microbes used via their zones of inhibition. Therefore, an activity guided isolation was undertaken.

The results of the phytochemical screening of the ethyl acetate extracts of the aerial plant parts of Maesobotrya barteri reviewed the presences of carbohydrates, reducing sugars, cardiac glycosides, saponins, steroids, triterpenes, flavonoids and tannins (Table 1).

Constituents Ethylacetate extract
Carbohydrate +
Saponnins -
Flavonoid +
Tannins +
Cardiac glycosides +
Steroids +
Triterpenes +
Anthraquinone -
Alkaloids -

Table 1: Phytochemical constituents of Ethylacetate extract Aerial plant parts of M. barteri.

Bioactivity of Compound EN1 Pure Isolate

The antimicrobial activities of compound EN1 isolated from ethyl acetate extract of the aerial plant parts of M.barteri was examined and agar disc diffusion method [13] was employed for the determination of the antimicrobial activities. The pure compound was determined using some pathogenic microbes; the microbes were obtained from the department of Medical Microbiology Ahmadu Bello University Teaching- Hospital, Zaria, Nigeria.

The determination of minimum inhibitory concentration was carried out using the nutrient broth susceptibility assay prepared according to the manufacturer’s instructions, as recommended by NCCLS [14]. Minimum inhibition McFarland turbidity standard scale number 0.5 was prepared to give turbid solution. Normal saline was prepared and was dispensed into test tube and the test microorganism was then inoculated into the normal saline, incubation was at 37°C for 6hrs, dilution of the microorganism in the normal was performed until the turbidity marched that of the McFarland by visual comparison at this point the microorganism had a concentration of about 1.5?108cfu/ml.

Minimum Bactericidal and fungicidal concentration of compound EN1 was carried out to check whether the test microbes were killed or only their growth was inhibited. Mueller Hunton agars were prepared according to the manufacturer’s instruction, as recommended by NCCLS [14]. They were boiled to dissolve and were sterilized at 121°C for 15 minutes, the media were cool to 45°C and the medium (20 ml) was poured in to sterile Petri dishes, the plates were covered and allowed to cool and solidify. The contents of the MIC in the serial dilution was inoculated on to the media, the media were incubated at 37°C for 24hrs for the bacteria and at 30°C for 1-7 days for fungi, after which the plate were observed for colonies growth. The MBC/MFC was the plate with lowest concentrations of the extract without colony growth.

Table 2 shows the Zones of inhibition (mm) of the pure the compound EN1 from the ethyl acetate fraction which showed remarkable activity against twelve of the sixteen organisms tested. Compound EN1 could not inhibit the growth of Corynebacterium ulcerans, Candida albicans, Candida tropicalis, Aspergillus fumigates, Aspergillus nigre. The various minimum inhibitory concentration (MIC) and minimum Bacteriocidal concentration and fungicidal concentration (MBC/MFC) for the different microbes are as shown in Tables and the bioactivity of the aerial plant parts of M. barteri is comparable to the drugs Ciprofloxacin, Fluconazole and Fulcin used as positive controls.

Test Organism Compound EN1 Ciprofloxacin Fluconazole Fulcin
Staphylococus aureus 32 37 0 0
Streptococuspyogenes 30 35 0 0
Streptococcus  feacalis 32 39 0 0
Corynebacteruimulcerans 0 32 0 0
Escherichia coli 32 38 0 0
Klebsiella pneumonia 32 40 0 0
Salmonella typhi 30 42 0 0
Shigella dysenteriae 30 40 0 0
Candida albicans 0 0 35 0
Candida krusei 27 0 37 0
Candida tropicalis 0 0 32 0
Candida stellatoidea 25 0 37 0
Microsporumsp 26 0 0 38
Aspargillus fumigates 0 0 0 32
Aspargillusnigre 0 0 0 34
Trichophytonrutarum 28 0 0 38

Table 2: Zone of inhibition of Compound EN1 against the test microorganism.

image

Tables 2 and 3 show the activity of the compound EN1which the spectroscopic analysis was proposed to be a β-Amyrin or β-Amyrenol, (C30H50O, 426.7 g/mol). Antimicrobial screening reported from other natural products has also confirmed the microbial properties of β-Amyrin. β-Amyrin was isolated from Ardisiaelliptica [9], a medicinal plant used for alleviating chest pain, fever, liver poisoning and parturition complications. It was found that β-Amyrin was six times as active as aspirin in inhibiting platelets aggregation. β-amyrin was isolated for the first time from Laurenciamicrocladia, marine algae distributed widely in Egypt found to have antibacterial activity against Staphylococcus aureus, Bacillus subtilis, Salmonella typhi, Escherichia coli, and Pseudomonas aeurginosa [10].

Test Organisms Concentration 50 μg/ml 25 μg/ml 12.5 μg/ml 6.2 μg/ml
Staphylococus Aureus - - - o* +
Streptococus Pyogenes - - o* + +
Streptococcus Feacalis - - - o* +
Escherichia Coli - - - o* +
Klebsiella Pneumonia - - - o* +
Salmonella Typhi - - - o* +
Shigella Dysenteria - - - o* +
Candida Krusei - - o* + +
Candida Stellatoidea - - o* + +
Microsporum Sp - - o* + +
Trichophyton Rubrum - - o* + +

Table 3a: Minimum Inhibition Concentration (MIC).

Test Organisms Concentration 50 μg/ml 25 μg/ml 12.5 μg/ml 6.2 μg/ml 3.12 μg/ml
Staphylococus aureus - - o* + + +
Streptococus pyogenes - - o* + + +
Streptococcus feacalis - - o* + + +
Escherichia coli - - o* + + +
Klebsiella pneumonia - - - o* + +
Salmonella typhi - - o* + + +
Shigella dysenteria - - o* + + +
Candida krusei - - o* + + +
Candida stellatoidea - o* + + + +
Microsporum sp - o* + + + +
Trichophyton rubrum - - o* + + +

Table 3b: Minimum Bactericidal Concentration and Minimum Fungicidal Concentration (MBC/MFC).

Spectra Results

The structure of compound EN1 was elucidated using Nuclear Magnetic Resonance Spectroscopy(NMR), 1-DNMR and 2-DNMR and also by comparing the obtained data with already existing literature. The results obtained are as shown in the table 4.

Carbon Position δ13CNMδppmβ-amyrin,  Experimental δ13CNMRδppmβ-amyrin, Literature [12] δ13CNMRδppmβ-amyrin, Literature [11]
1 38.8495 38.7      37.3
2 27.2530 27.2      28.28
3 79.0731 79.3      71.85
4 38.7715 38.5 37.30
5 55.2568 55.1 36.81
6 18.3150 18.6 21.12
7 38.6441 32.4 42.35
8 39.5194 39.8 45.90
9 47.9239 47.6 50.18
10 36.7105 36.9 36.55
11 23.5770 23.6 24.33
12 125.9002 121.7 121.70
13 137.9624 145.2 140.81
14 42.0388 41.7        44.36
15 29.3557 26.2 26.13
16 21.1608 26.1 23.11
17 29.6969 32.6 48.48
18 47.5759 47.2  45.89
19 39.0811 46.8  39.82
20 30.6267 31.0 36.49
21 33.0001 34.7 34.00
22 37.0200 37.1 31.71
23 28.0359 28.0 29.3
24 15.5986 15.4 19.84
25 15.4777 15.4  19.10
26 16.9846 16.8   18.90
27 24.2027 25. 9 18.30
28 17.0954 28.4 19.20
29 28.1492 33.8 36.18
30 23.3098 23.7 19.42

Table 4: Comparison of 13C NMR spectrum data of β-amyrin Obtained from the Aerial parts of M. barteri with literature

H1NMR: 7.2401, 5.2346, 3.2100, 3.2021, 3.1911, 3.1836, 2.3241, 2.1768, 2.1585, 2.0742, 2.0181, 2.0023, 1.9942, 1.9793, 1.9727, 1.9067, 1.9012, 1.8923, 1.8865, 1.8621, 1.8455,1.8379, 1.8227, 1.7276, 1.7067, 1.6857, 1.6669, 1.6529, 1.6353, 1.6302, 1.6127, 1.5952, 1.5890, 1.5669,1.5463, 1.5230,1.4987,1.4836,1.4667,1.4579,1.4402,1.4276,1.373 0,1.3429, 1.3195, 1.2990, 1.2780, 1.2630, 1.2329, 1.1813, 1.1514, 1.1169, 1.0870, 1.0639, 1.0316, 1.0195, 0.9989, 0.9759, 0.9681, 0.9404, 0.9322, 0.9217, 0.9088, 0.8927, 0.8841, 0.8680, 0.8591, 0.8450 0.8341

13CNMR: 137.9624, 125.9002, 79.0731, 77.2169, 77.0054, 76.7938, 55.2568, 52.7408, 47.9239, 47.5759,42.0388, 39.5194, 39.0811, 38.8495, 38.7715, 38.6441, 37.0200, 36.7105, 33.0001, 30.6267, 29.6969, 29.3557, 28.1492, 28.0359, 27.2530, 24.2027, 23.5770, 23.3098, 21.1608, 18.3150,17.0954, 16.9846, 15.5986, 15.4777.

The 13C NMR spectrum (Figures 1-7) showed thirty (30) major recognizable carbon signals, eight methyl groups at δ37.0200 (C- 22), 28.0359 (C-23), 15.5986 (C-24), 15.4777(C-25), 16.9846 (C-26), 24.2027 (C-27), 17.0954(C-28), 28.1492(C-29), 23.3098 (C-30) and a secondary hydroxyl bearing carbon 79.0731 at (C-3). It also showed some recognizable signals at δ 125.9002 and 137.9624 ppm which is assignable to the double bond at C-12 and C-13. In addition, ten methylene groups, eight methyl groups, six quaternary carbons atoms from DEPT experiment were observed. The chemical shift at δ137.962, 125.9002 which are C-12 and C-13 and the consistent flow of methyl groups from C-23 to C-30 were characteristic peaks for a β- Amyrin type of skeleton [11] and [12].

medicinal-chemistry-1HNMR

Figure 1: 1HNMR.

medicinal-chemistry-13CNMR

Figure 2 : 13C NMR

medicinal-chemistry-DEPT

Figure 3: DEPT.

medicinal-chemistry-COSY

Figure 4: COSY

medicinal-chemistry-NOESY

Figure 5: NOESY

medicinal-chemistry-HMBC

Figure 6: HMBC

medicinal-chemistry-HSQC

Figure 7: HSQC

1HNMR, 13C NMR and DEPTH spectra of the proposed compound β-amyrin.

Conclusion

The isolation of β-Amyrin from the aerial plant parts of M. barteri, whose bioactivity was established from this work by its zone of inhibition, is comparable to the drugs of Ciprofloxacin, Fluconazole and Fulcin. This justifies why the plant really serves as a general purpose antibiotic in traditional medicine in our society. The preliminary phytochemical screening also shows that the ethyl acetate extract contains other classes of compounds that can be further isolated and tested for microbial activities and this can lead to chains of discoveries as the quest of precursors for modern drugs are continually on course.

Acknowledgement

Authors thank Professor Francis Oluwole Shode of Department of Chemistry, University of Kwa-zulunatal, Durban, South Africa and Dr Habila James of the Department of Chemistry, Ahmadu Bello University, Zaria, Nigeria for helping in carrying out the spectroscopic analysis of the sample. We also like to acknowledge the Department of Chemistry, Ahmadu Bello University, Zaria- Nigeria, for providing an enabling laboratory environment for this research work.

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