Assessment of Long-Term Storage on Antimicrobial and Cyclooxygenase-Inhibitory Properties of South African Medicinal Plants

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In traditional medicine, plant materials are often stored by traditional healers, plant gatherers and traders before they are eventually consumed or sold. The critical point is whether stored medicinal plants are as active as freshly harvested dried material. We evaluated the effects of long-term storage (12 or 16 years) on the antimicrobial (microplate dilution method) and anti-inflammatory (COX-1 and COX-2 inhibition) potencies of 21 extensively used traditional medicinal plants in treating pain and infection-related ailments. The minimum inhibitory concentration (MIC) values obtained againstStaphylococcus aureusandPseudomonas aeruginosain the stored plant materials were generally either lower or roughly the same as in the fresh material. Most of the stored plant material had comparable minimum microbicidal concentration (MMC) values as the fresh material againstS. aureusandP. aeruignosa. Similarly, the majority (71%) of the stored plant material had similar MIC and/or MMC values as fresh material against the fungusCandida albicans. The percentage inhibition of COX-1 by the majority (88%) of the stored material was not significantly different when compared to those freshly collected. Stored material ofClausena anisata,Ekebergia capensisandTrichilia dregeanashowed a significantly higher COX-1 inhibition than the fresh material. The therapeutic and conservation implications of the results are discussed. Copyright © 2012 John Wiley & Sons, Ltd.

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