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Antimycobacterial evaluation and preliminary phytochemical investigation of selected medicinal plants traditionally used in Mozambique.
J Ethnopharmacol. 2011 Sep 01; 137(1):114-20.JE

Abstract

ETHNOPHARMACOLOGICAL RELEVANCE

Several medicinal plants are traditionally used in Mozambique to treat tuberculosis and related symptoms.

AIMS OF THE STUDY

It was aimed to assess the in vitro antimycobacterial activity of crude extracts from fifteen medicinal plants and to reveal main classes of compounds which may account for the activity of extracts.

METHODS AND MATERIALS

The plant materials were sequentially extracted by n-hexane, dichloromethane, ethyl acetate, and 70% ethanol. Decoction of each plant material was also prepared according to traditional use. Broth microdilution method was employed to screen extracts against two mycobacterial species: Mycobacterium smegmatis ATCC 607 and Mycobacterium tuberculosis H37Rv. The extracts with minimum inhibitory concentration(s) (MIC) below 125 μg/mL were considered active and further tested against different mycobacterial species and strains, namely Mycobacterium tuberculosis H37Ra, Mycobacterium bovis BCG ATCC 35734, Mycobacterium smegmatis mc(2) 155, Mycobacterium avium DSM 44156 and DSM 44157. Cytotoxic effect was evaluated against human macrophages from the monocytic THP-1 cells. Main classes of compounds in these active extracts were proposed from their (1)H NMR spectroscopic characterizations.

RESULTS

n-Hexane extracts of Maerua edulis and Securidaca longepedunculata, ethyl acetate extract of Tabernaemontana elegans and dichloromethane extract of Zanthoxylum capense were found to possess considerable activity against Mycobacterium bovis BCG and Mycobacterium tuberculosis H37Ra with MIC 15.6-62.5 μg/mL. Tabernaemontana elegans ethyl acetate extract displayed strong activity against Mycobacterium tuberculosis H37Rv (MIC 15.6 μg/mL). Except for Tabernaemontana elegans ethyl acetate extract which presented potent cytotoxic effects in THP-1 cells (IC(50)<4 μg/mL), the other three plant extracts showed moderate to none toxicity. Based on (1)H NMR spectroscopic analysis, major components in both Maerua edulis and Securidaca longepedunculata n-hexane extracts were linear chain unsaturated fatty acids. Zanthoxylum capense dichloromethane extract contained more complex constituents (mostly phenolic compounds). In the most potent extract, Tabernaemontana elegans ethyl acetate extract, the prominent compounds were identified as indole alkaloids.

CONCLUSIONS

The pronounced antimycobacterial activity of the medicinal plants Maerua edulis, Securidaca longepedunculata, Zanthoxylum capense, and Tabernaemontana elegans suggested that they might provide compounds which could be potential anti-TB drug leads.

Authors+Show Affiliations

Research Institute for Medicines and Pharmaceutical Sciences (iMed.UL), Faculdade de Farmácia, Universidade de Lisboa, Av. D. Forças Armadas, 1600-083 Lisboa, Portugal.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

21571059

Citation

Luo, Xuan, et al. "Antimycobacterial Evaluation and Preliminary Phytochemical Investigation of Selected Medicinal Plants Traditionally Used in Mozambique." Journal of Ethnopharmacology, vol. 137, no. 1, 2011, pp. 114-20.
Luo X, Pires D, Aínsa JA, et al. Antimycobacterial evaluation and preliminary phytochemical investigation of selected medicinal plants traditionally used in Mozambique. J Ethnopharmacol. 2011;137(1):114-20.
Luo, X., Pires, D., Aínsa, J. A., Gracia, B., Mulhovo, S., Duarte, A., Anes, E., & Ferreira, M. J. (2011). Antimycobacterial evaluation and preliminary phytochemical investigation of selected medicinal plants traditionally used in Mozambique. Journal of Ethnopharmacology, 137(1), 114-20. https://doi.org/10.1016/j.jep.2011.04.062
Luo X, et al. Antimycobacterial Evaluation and Preliminary Phytochemical Investigation of Selected Medicinal Plants Traditionally Used in Mozambique. J Ethnopharmacol. 2011 Sep 1;137(1):114-20. PubMed PMID: 21571059.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Antimycobacterial evaluation and preliminary phytochemical investigation of selected medicinal plants traditionally used in Mozambique. AU - Luo,Xuan, AU - Pires,David, AU - Aínsa,José A, AU - Gracia,Begoña, AU - Mulhovo,Silva, AU - Duarte,Aida, AU - Anes,Elsa, AU - Ferreira,Maria-José U, Y1 - 2011/05/05/ PY - 2011/01/17/received PY - 2011/04/01/revised PY - 2011/04/26/accepted PY - 2011/5/17/entrez PY - 2011/5/17/pubmed PY - 2011/12/28/medline SP - 114 EP - 20 JF - Journal of ethnopharmacology JO - J Ethnopharmacol VL - 137 IS - 1 N2 - ETHNOPHARMACOLOGICAL RELEVANCE: Several medicinal plants are traditionally used in Mozambique to treat tuberculosis and related symptoms. AIMS OF THE STUDY: It was aimed to assess the in vitro antimycobacterial activity of crude extracts from fifteen medicinal plants and to reveal main classes of compounds which may account for the activity of extracts. METHODS AND MATERIALS: The plant materials were sequentially extracted by n-hexane, dichloromethane, ethyl acetate, and 70% ethanol. Decoction of each plant material was also prepared according to traditional use. Broth microdilution method was employed to screen extracts against two mycobacterial species: Mycobacterium smegmatis ATCC 607 and Mycobacterium tuberculosis H37Rv. The extracts with minimum inhibitory concentration(s) (MIC) below 125 μg/mL were considered active and further tested against different mycobacterial species and strains, namely Mycobacterium tuberculosis H37Ra, Mycobacterium bovis BCG ATCC 35734, Mycobacterium smegmatis mc(2) 155, Mycobacterium avium DSM 44156 and DSM 44157. Cytotoxic effect was evaluated against human macrophages from the monocytic THP-1 cells. Main classes of compounds in these active extracts were proposed from their (1)H NMR spectroscopic characterizations. RESULTS: n-Hexane extracts of Maerua edulis and Securidaca longepedunculata, ethyl acetate extract of Tabernaemontana elegans and dichloromethane extract of Zanthoxylum capense were found to possess considerable activity against Mycobacterium bovis BCG and Mycobacterium tuberculosis H37Ra with MIC 15.6-62.5 μg/mL. Tabernaemontana elegans ethyl acetate extract displayed strong activity against Mycobacterium tuberculosis H37Rv (MIC 15.6 μg/mL). Except for Tabernaemontana elegans ethyl acetate extract which presented potent cytotoxic effects in THP-1 cells (IC(50)<4 μg/mL), the other three plant extracts showed moderate to none toxicity. Based on (1)H NMR spectroscopic analysis, major components in both Maerua edulis and Securidaca longepedunculata n-hexane extracts were linear chain unsaturated fatty acids. Zanthoxylum capense dichloromethane extract contained more complex constituents (mostly phenolic compounds). In the most potent extract, Tabernaemontana elegans ethyl acetate extract, the prominent compounds were identified as indole alkaloids. CONCLUSIONS: The pronounced antimycobacterial activity of the medicinal plants Maerua edulis, Securidaca longepedunculata, Zanthoxylum capense, and Tabernaemontana elegans suggested that they might provide compounds which could be potential anti-TB drug leads. SN - 1872-7573 UR - https://www.unboundmedicine.com/medline/citation/21571059/Antimycobacterial_evaluation_and_preliminary_phytochemical_investigation_of_selected_medicinal_plants_traditionally_used_in_Mozambique_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0378-8741(11)00314-X DB - PRIME DP - Unbound Medicine ER -