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South African Medicinal Orchids: Mayashree Chinsamy

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South African Medicinal Orchids: Mayashree Chinsamy SOUTH AFRICAN MEDICINAL ORCHIDS: A PHARMACOLOGICAL AND PHYTOCHEMICAL EVALUATION MAYASHREE CHINSAMY Submitted in fulfillment of the academic requirements for the degree of Doctor of Philosophy in the Research Centre for Plant Growth and Development School of Biological and Conservation Sciences University of KwaZulu-Natal Pietermaritzburg March 2012 FACULTY OF SCIENCE AND AGRICULTURE DECLARATION 1 - PLAGIARISM I, MAYASHREE CHINSAMY Student Number: 202500097 declare that: 1. The research contained in this thesis, except where otherwise indicated, is my original research. 2. This thesis has not been submitted for any degree or examination at any other University. 3. This thesis does not contain other persons‟ data, pictures, graphs or other information, unless specifically acknowledged as being sourced from other persons. 4. This thesis does not contain other persons‟ writing, unless specifically acknowledged as being sourced from other researchers. Where other written sources have been quoted, then: a. Their words have been re-written but the general information attributed to them has been referenced. b. Where their exact words have been used, then their writing has been placed in italics and inside quotation marks, and referenced. 5. This thesis does not contain text, graphics or tables copied and pasted from the internet, unless specifically acknowledged, and the source being detailed in the thesis and in the reference section. Signed at………………………………….. day of …………….2012 Signature……………………….. i STUDENT DECLARATION South African Medicinal Orchids: A Pharmacological and Phytochemical Evaluation I, MAYASHREE CHINSAMY Student Number: 202500097 Declare that: 1. The research reported in this dissertation, except where otherwise indicated is the result of my own endeavours in the Research Centre for Plant Growth and Development, School of Biological and Conservation Sciences, University of KwaZulu-Natal, Pietermaritzburg. 2. This dissertation has not been submitted for any degree or examination at any other University. 3. This thesis does not contain data, figures or writing, unless specifically acknowledged, copied from other researchers; and 4. Where I have produced a publication of which I am an author or co-author, I have indicated which part of the publication was contributed by me. Signed as………………………….on the.….. day of …….…. 2012 ______________________________ SIGNATURE ii DECLARATION BY SUPERVISORS We hereby declare that we acted as Supervisors for this PhD student: Student‟s Full Name: MAYASHREE CHINSAMY Student Number: 202500097 Thesis title: South African Medicinal Orchids: A Pharmacological and Phytochemical Evaluation Regular consultation took place between the student and us throughout the investigation. We advised the student to the best of our ability and approved the final document for submission to the Faculty of Science and Agriculture Higher Degrees Office for examination by the University appointed Examiners. SUPERVISOR: __________________________ PROFESSOR J. VAN STADEN CO-SUPERVISOR: __________________________ DR JF. FINNIE iii ABSTRACT The Orchidaceae makes up the largest and most diverse family of flowering plants. Orchids are popular, often expensive ornamentals, with a broad range of ethnobotanical applications. There is very limited documented information on South African medicinal orchid species; no formal pharmacopoeia outlining ethnobotanical uses; and ethnobotanical and distribution records are either scarce or inconsistent and plant populations are becoming gradually smaller. There have been significant developments in medicinal orchid research worldwide with medicinal use and corresponding pharmacological and phytochemical properties being extensively investigated. It is evident from the literature that there is no pharmacological research on South African medicinal orchids; hence the need to explore biological activity and chemical composition of South African medicinal orchid species. The ethnobotanical approach used to select the orchid species for pharmacological and phytochemical research elsewhere, yielded valuable biological compounds. Thus, a similar approach was applied to South African medicinal orchids. There are approximately 20 000 species and 796 genera of orchids distributed across the world. In southern Africa, orchids are widely represented with 55 genera and 494 species. Approximately 75% are endemic to this region. As part of the current investigation a review of available ethnobotanical literature on South African medicinal orchids was prepared. The review revealed that an estimated 49 indigenous orchid species from 20 orchid genera are currently being informally traded and used in South African traditional medicine. They are used primarily for medicinal and cultural purposes, especially by the Zulu community in South Africa. Medicinal uses of orchid species include: treatment of inflammatory, intestinal, neurological and reproductive disorders and emetics are used to cause emesis. Non-medicinal uses of orchid species include: love, fertility, protective and lethal charms. Based on their ethnobotanical uses and endemism, South African orchids were considered to be one of the untapped sources of bioactive compounds that needed to be researched. The current investigation addressed the broader aims of medicinal plant research by determining the efficacy, safety and chemical profile of seven indigenous orchid species used in South African traditional medicine and practices. The biological and toxic effects of orchid plant iv extracts were assessed using established pharmacological bioassays. The phytochemical evaluation of the seven orchid plant extracts provided insight into the classes of chemical compounds present and their possible role in the observed biological activities. The potential of plant extracts from seven orchid species used in South African traditional medicine, as sources of natural bioactive products, are discussed. The current investigation determined the biological activity and chemical profile of seven orchid species commonly traded in KwaZulu-Natal herbal markets: Ansellia africana Lindl., Bulbophyllum scaberulum (Rolfe) Bolus, Cyrtorchis arcuata (Lindl.) Schltr., Eulophia hereroensis Schltr., Eulophia petersii (Rchb.f.) Rchb.f., Polystachya pubescens (Lindl.) Rchb.f. and Tridactyle tridentata (Harv.) Schltr. Well established in vitro micro-dilution bioassays were used to determine the antibacterial, antifungal, anthelmintic activities of crude orchid extracts. A minimum inhibitory and/or lethal effect of organic and aqueous crude orchid extracts was observed against Bacillus subtilis, Escherichia coli, Klebsiella pneumoniae, Staphylococcus aureus, Candida albicans and Caenorhabditis elegans. Tridactyle tridentata aqueous root extract produced the most effective antibacterial activity against S. aureus (0.049 mg/ml). All T. tridentata organic root extracts produced significant inhibitory activities against B. subtilis and S. aureus. Eulophia petersii DCM pseudobulb extracts significantly inhibited all bacterial strains tested (0.39 mg/ml against S. aureus and 0.78 mg/ml against B. subtilis, E. coli, and K. pneumoniae). Eulophia hereroensis 80% EtOH root extract was the only other extract to exhibit significant inhibitory effects against K. pneumoniae (0.65 mg/ml). After 48 h C. albicans was most susceptible to P. pubescens aqueous pseudobulb extract (0.0816 mg/ml). Eulophia petersii DCM pseudobulb extract however, exhibited significant activity against C. albicans (0.65 mg/ml) over 72 h. Cyrtorchis arcuata leaf and root extracts were the most effective anthelmintic extracts with MLCs of 0.041 mg/ml for 80% EtOH leaf and root extracts; 0.049 mg/ml for aqueous leaf extracts and 0.78 mg/ml for aqueous and DCM root extracts. Caenorhabditis elegans was most susceptible to all A. africana and T. tridentata organic root extracts. A similar significant effect was observed for all E. petersii organic pseudobulb extracts, DCM extracts and organic root extracts of B. scaberulum. Only the DCM tuber and root extracts of E. hereroensis exhibited lethal effects on C. elegans. All of the P. pubescens extracts showed poor anthelmintic activity. v Similarly, in vitro enzyme based cyclooxygenase (COX) 1 and 2 and acetylcholinesterase (AChE) inhibitory bioassays, revealed significant inhibition of COX-1, COX-2 and AChE enzymes by crude organic and certain aqueous orchid extracts. Out of a total of 53 evaluated extracts, 21 and 13 extracts exhibited significant anti-inflammatory activity in the COX-1 and COX-2 assays respectively. The DCM tuber extract of E. hereroensis was the only extract to significantly inhibit both COX enzymes, 100.02±0.11% and 87.97±8.38% respectively. All B. scaberulum root extracts (DCM, EtOH and water) exhibited COX-2 selective inhibitory activity (100.06±0.01, 93.31±2.33 and 58.09±3.25%) . Overall, the DCM root extract of A. africana was found to be the most potent extract (EC50 0.25±0.10 mg/ml). The 80% EtOH root extract of B. scaberulum was the most potent in the COX-2 assay (EC50 0.44±0.32 mg/ml). Generally the root extracts exhibited greater AChE inhibitory activity; where the most active extract was B. scaberulum DCM root extract (EC50 0.02±0.00 mg/ml). All aqueous extracts, except that of A. africana roots and B. scaberulum pseudobulbs, showed poor or no COX-1 and COX-2 inhibition. The antioxidant capacity of crude orchid extracts was determined using: hydrogen atom transfer (HAT) (β-carotene/linoleic acid assay) and single electron transfer (SET)
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