%0 Journal Article
%T Identification of the AntiListerial Constituents in Partially Purified Column Chromatography Fractions of Garcinia kola Seeds and Their Interactions with Standard Antibiotics
%A D. Penduka
%A L. Buwa
%A B. Mayekiso
%A A. K. Basson
%A A. I. Okoh
%J Evidence-Based Complementary and Alternative Medicine
%D 2014
%I Hindawi Publishing Corporation
%R 10.1155/2014/850347
%X Partially purified fractions of the n-hexane extract of Garcinia kola seeds were obtained through column chromatography and their constituents were identified through the use of gas chromatography coupled to mass spectrometry (GC-MS). Three fractions were obtained by elution with benzene as the mobile phase and silica gel 60 as the stationery phase and these were named Benz1, Benz2, and Benz3 in the order of their elution. The antiListerial activities of these fractions were assessed through MIC determination and only Benz2 and Benz3 were found to be active with MIC¡¯s ranging from 0.625 to 2.5£¿mg/mL. The results of the GC-MS analysis showed Benz2 to have 9 compounds whilst Benz3 had 7 compounds, with the major compounds in both fractions being 9,19-Cyclolanost-24-en-3-ol, (3.¦Â.) and 9,19-Cyclolanostan-3-ol,24-methylene-, (3.¦Â.). The Benz2 fraction was found to have mainly indifferent interactions with ampicillin and penicillin G whilst mainly additive interactions were observed with ciprofloxacin. The Benz3 fraction¡¯s interactions were found to be 50% synergistic with penicillin G and 25% synergistic with ciprofloxacin and ampicillin. A commercially available 9,19-Cyclolanost-24-en-3-ol, (3.¦Â.) was found not to exhibit any antiListerial activities at maximum test concentrations of 5£¿mg/mL, suggesting that the compound could be acting in synergy with the other compounds in the eluted fractions of Garcinia kola seeds. 1. Introduction Plants produce a vast diversity of secondary metabolites most of which are phytochemicals that have potential use in the pharmaceutical industry for new drug development purposes. Phytochemicals are naturally occurring bioactive plant compounds that act as a natural defence system for the host plant and also provide colour, aroma, and flavour [1]. Some phytochemicals have been shown to possess antimicrobial properties and these include terpenoids, essential oils, alkaloids, lectins, polypeptides, polyacetylenes, and phenolics, of which phenolics can be further divided into phenolic acids, flavonoids, quinones, tannins, coumarins, and simple phenols [2]. The terpenes are one of the largest and most diverse groups of plant secondary metabolites. They include complex compounds that are formed by the cyclization of 2,3-oxidosqualene [3]. They include terpenoids and sterols as well as essential oils which carry the fragrance of the plant. Terpenes possess antimicrobial properties and their mechanism of action is mainly through disruption of the bacterial membrane [2, 3]. Flavones, flavonoids, and flavonols are phenolic structures
%U http://www.hindawi.com/journals/ecam/2014/850347/