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Carpobrotus Edulis? African Journal of Biotechnology Vol. 7 (22), pp. 4164-4171, 19 November, 2008 Available online at http://www.academicjournals.org/AJB ISSN 1684–5315 © 2008 Academic Journals Full Length Research Paper Does seasonal variation influence the phytochemical and antibacterial properties of Carpobrotus edulis? Pirwana K. Chokoe, Peter Masoko, Matlou P. Mokgotho, Rachmond L. Howard and Leseilane J. Mampuru* University of Limpopo, Department of Biochemistry, Microbiology and Biotechnology, Private Bag X1106, Sovenga, South Africa, 0727. Accepted 15 August, 2008 Carpobrotus edulis L. (family Aizoaceae) has been used by locals over the years to treat microbial infections. Extracts of varying polarities were prepared from the leaf debris and filtrate of a spring and an autumn harvest of C. edulis. Thin layer chromatography was used to analyze the phytocompounds of the extracts as well as to assay the plant for antioxidant compounds. The spring harvest showed equal distribution of the phytochemicals within the leaf debris and the filtrate, but there was a high prevalence of phytocompounds within the leaf debris extracts of the autumn sample. An antioxidant compound was intensely pronounced in the autumn extracts of intermediate polarity and in the polar extract. The plant was evaluated for antibacterial activity against Escherichia coli, Enterococcus faecalis, Pseudomonas aeruginosa and Staphylococcus aureus by using a two-fold serial microdilution method as well as bioautography. The spring extracts were more potent against all test organisms, having MIC values that were lower than the autumn extracts. When taking the total activity of each extract into account, the autumn extracts showed higher efficacy than the extracts from the spring sample. The antibacterial activity observed in the extracts of both seasons somewhat validated the ethnomedicinal use of C. edulis. Key words: Carpobrotus edulis, antibacterial, antioxidant, minimum inhibitory concentration, bioautography, seasonal. INTRODUCTION The search for new drugs to combat diseases and activity allowing these plants to be studied and used for infections has roused the interest of scientists all over the the development of new antimicrobial drugs (Nascimento world in herbal remedies. Due to the emergence of multi- et al., 2000). The effectiveness of phytochemicals in the drug-resistant microorganisms, a huge field of research treatment of various diseases may lie in their antioxidant has arisen for novel antimicrobial agents against which effects (Akinmoladun et al., 2007). Bioactive phytocom- microorganisms have not yet acquired resistance (Rojas pounds isolated from plants include flavonoids, phenolic et al., 2006; Samie et al., 2005). These antimicrobial acids, tannins, etc, and according to Korotkova et al. agents are best obtained from medicinal plants because (2003) many of these possess antioxidant activity. many of the diseases treated with these plants are of According to van der Watt and Pretorius (2001) the microbial origin (Nascimento et al., 2000). In order to family Aizoaceae is one of the most abundant and promote the use of medicinal plants as potential sources diverse plant families in Southern Africa. The genus Car- of antimicrobial compounds, it is pertinent to thoroughly pobrotus falls within this family and is well identified by its investigate their composition and activity, and thus trailing structure and thin, blade-like succulent leaves validate their use (Nair and Chanda, 2006). Some (Springfield and Weitz, 2006). For decades, traditional phytochemicals, produced by plants, have antimicrobial healers all over South Africa have been utilizing various species of Carpobrotus genus to treat fungal and bacterial infections (van der Watt and Pretorius, 2001). The antibacterial activity of Carpobrotus edulis L. *Corresponding author. E-mail: [email protected]. (Aizoaceae) has been studied before (van der Watt and Chokoe et al. 4165 Pretorius, 2001). Six active compounds were purified Antibacterial Activity Assays from an ethyl acetate extract and were all identified as flavonoids. These individual compounds showed antibac- Test organisms terial activity against both gram-negative and gram- The antibacterial assays were done using two gram-negative and positive bacteria (van der Watt and Pretorius, 2001). two gram-positive bacteria that have been maintained on agar The aim of the current study was to qualitatively and slants and sub-cultured in Luria broth prior to use. The gram- quantitatively evaluate and compare the antibacterial negative cultures tested were Escherichia coli (ATCC 27853) and activity of C. edulis leaves harvested in two different Pseudomonas aeruginosa (ATCC 25922); and the gram-positive cultures were Enterococcus faecalis (ATCC 21212) and seasons (spring and autumn) and to further use a more Staphylococcus aureus (ATCC 29213). These four bacterial strains sensitive method to assess its antibacterial activity. are recommended for use by the National Committee for Clinical Therefore, this information may help in identifying the Laboratory Standards (NCCLS, 1992) as these species are the season that is more suitable for harvesting the plant for major causes of nosocomial infections in hospitals (Sacho and pharmacological evaluation. Schoub, 1993). Microdilution Assay MATERIALS AND METHODS Antibacterial activity was evaluated by estimating the minimum Plant collection and Storage inhibitory concentration (MIC) of each extract on E. faecalis, E. coli, P. aeruginosa and S. aureus using the microdilution method The leaves of the wild fig (C. edulis) were collected from University developed by Eloff (1998a). Each culture was assayed in triplicate. of Limpopo (Turfloop campus) gardens in spring and in autumn. The extracts were redissolved in acetone to a final concentration of The leaves were homogenized in a Warring Commercial Blendor 10 mg/ml. Two-fold serial dilutions of the extracts (2.5 mg/ml to 0.02 (Model 32BL79, Dynamics Corporation, New Hartfort, CT, U.S.A) mg/ml) were prepared in 96-well microtiter plates. The wells in each and filtered through Whatman No. 3 filter paper. The leaf extract plate were inoculated with 100 l of the relevant culture and and filtrate were both dried under a stream of air at room tempera- incubated at 37oC overnight. Forty microlitres (40 l) of 0.2 mg/ml ture and stored in a dark cupboard in separate covered glass iodonitrotetrazolium chloride (INT) (Sigma-Aldrich) was added to beakers at room temperature. each well and the plates were incubated for 30 min at 37oC for S. aureus and P. aeruginosa, 1.5 h for E. coli and 24 h for E. faecalis. The formation of a red colour signified microbial growth. Extraction procedure Two grams (2 g) of each of the leaf samples was extracted once Bioautography with 20 ml of one of the following solvents: hexane, dichlorome- thane (DCM), ethyl acetate, acetone and methanol (Rochelle Bioautographic procedure was done according to Begue and Kline Chemicals, South Africa). The samples were shaken vigorously at (1972). Briefly, sixteen TLC plates were loaded with 10 mg/ml of room temperature for 40 min and filtered into pre-weighed beakers. each of the extracts dissolved in acetone. The plates were develop- The solvents were evaporated overnight under a stream of air at ed in CEF, EMW, BAW and BEA in groups of four and left to dry for room temperature. a week at room temperature under a stream of air. The test cultures used for the serial microdilution assay were sprayed on one plate (for each mobile phase) and the plates were incubated overnight at o Phytochemical Analysis 37 C and 100% humidity. The plates were sprayed with 2 mg/ml INT and incubated for 1 h. Clear zones on the plates indicated Phytochemical properties of the plant were analyzed by loading 10 areas of growth inhibition. l of each filtered sample, redissolved in acetone to make 10 mg/ml, onto four aluminium-backed TLC plates (Merck, silica gel 60 F254). The plates were then developed separately in CEF (5:4:1, RESULTS AND DISCUSSION chloroform : ethylacetate : formic acid), EMW (10:1.35:1, ethylace- tate : methanol : water), BAW (4:1:5, butanol : acetic acid : water), Extraction and BEA (18:2:0.2, benzene : ethanol : ammonia) (Kotze and Eloff, 2002). The chromatograms were visualized under ultraviolet light to detect the UV-active compounds. The plates were sprayed with Due to the vast differences in the nature of the chemical vanillin-sulphuric acid reagent (0.1 g vanillin, 28 ml methanol, 1 ml constituents found in a plant, there is no solvent that is sulphuric acid) and heated with a heat gun (PowaForce 2000 W) to able to extract all the compounds on its own. In this develop colour. study, 5 solvents of varying polarity were used in the extraction to accommodate the range of polarities of the TLC-DPPH antioxidant screening compounds obtained from C. edulis. The choice of solvent played a crucial role in the amount of material The plant was assayed for antioxidant activity by loading 10 l of 10 that was extracted from each of the samples. There was mg/ml of each filtered sample in acetone onto four aluminium- a general increase in the mass of material, in both the backed TLC plates. The plates were developed separately in CEF, spring and autumn samples, as the polarity of the EMW, BAW and BEA and later sprayed with 0.2% 2, 2-diphenyl-1- picryl-hydrazyl (DPPH) in absolute methanol to visualize the extracting solvent increased (Figure 1). The methanolic antioxidant compounds that may be present in the extracts (Deby extract yielded more material because methanol extracts and Margotteaux, 1970). more compounds of varying polarity (Eloff, 1998b). More 4166 Afr. J. Biotechnol. chemical compounds were best separated in the CEF mobile phase, which separates acidic compounds and A those of intermediate polarity. Previous studies using this species and other species of the Carpobrotus genus reported that many of the compounds present in the leaves of the plant are tannins and flavonoids (Springfield et al., 2003; Springfield and Weitz, 2006), which are both of intermediate polarity.
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