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Antimicrobial and antioxidant activity and chemical characterisation of Erythrina stricta Roxb. (Fabaceae).
J Ethnopharmacol. 2016 Jun 05; 185:171-81.JE

Abstract

ETHNOPHARMACOLOGICAL RELEVANCE

The bark of Erythrina stricta Roxb. (Fabaceae) has been used in Indian indigenous systems as a remedy for rheumatism, stomach-ache, asthma, dysentery, contact dermatitis, eczema and skin infections. However, there have been limited phytochemical or biological studies on the bark of E. stricta and there are no studies that align with its traditional medicinal uses.

AIM OF THE STUDY

The aim of this study was to assess the antimicrobial and antioxidant activity of the stem bark of E. stricta to support its topical use in the treatment of contact dermatitis, eczema and skin infections and to isolate and identify any bioactive compounds.

MATERIALS AND METHODS

MTT microdilution and disc diffusion assays were used to determine the antimicrobial activities of n-hexane, dichloromethane, ethyl acetate, methanol and water extracts of the bark of E. stricta. Column and preparative thin layer chromatography were used for the purification of the dichloromethane extract. The structures of the compounds isolated were elucidated by extensive 1D and 2D NMR spectroscopic techniques and comparison with published data. The antioxidant activities of the extracts were determined by DPPH free radical scavenging and FRAP assays and the antioxidant activity of the pure compounds by dot-blot and DPPH staining methods.

RESULTS

The dichloromethane, ethyl acetate, and n-hexane extracts showed the most significant activity with MIC values of 7.8µg/mL, 125µg/mL, and 125µg/mL against a sensitive strain of Staphylococcus aureus. The dichloromethane and ethyl acetate extracts also showed significant activity against Candida albicans with MIC values of 125µg/mL and 1mg/mL respectively. GC-MS analysis of the n-hexane extract showed the presence of the antibacterial and antifungal compounds β-caryophyllene, caryophyllene oxide, α-selinene, β-selinene, selin-11-en-4-α-ol, α-copaene and δ-cadenine. Phytochemical studies of the dichloromethane extract led to the isolation of the novel compound erynone (1), together with six known compounds; wighteone (2), alpinum isoflavone (3), luteone (4), obovatin (5), erythrinassinate B (6) and isovanillin (7). Luteone (4) exhibited the most significant antibacterial activity with minimum inhibitory quantity (MIQ) values of 1.88µg, 1.88µg and 3.75µg, respectively, against sensitive (MSSA) and resistant strains (MRSA and MDRSA) of S. aureus using a TLC bioautography assay. Erynone (1) exhibited the greatest DPPH free radical scavenging activity.

CONCLUSIONS

Seven compounds, including a new chromanone, were isolated from the antimicrobial dichloromethane extract of the stem bark of E. stricta. Six of the seven compounds showed antibacterial and/or antioxidant activities. These findings provide support for the customary (traditional and contemporary) use of E. stricta bark for the treatment of skin and wound infections.

Authors+Show Affiliations

Indigenous Bioresources Research Group, Faculty of Science and Engineering, Macquarie University, North Ryde, Sydney 2109, Australia.Indigenous Bioresources Research Group, Faculty of Science and Engineering, Macquarie University, North Ryde, Sydney 2109, Australia.Indigenous Bioresources Research Group, Faculty of Science and Engineering, Macquarie University, North Ryde, Sydney 2109, Australia.Indigenous Bioresources Research Group, Faculty of Science and Engineering, Macquarie University, North Ryde, Sydney 2109, Australia.Indigenous Bioresources Research Group, Faculty of Science and Engineering, Macquarie University, North Ryde, Sydney 2109, Australia.School of Chemistry, Faculty of Science, University of New South Wales, Sydney 2052, Australia.Research School of Chemistry, Faculty of Science, Australian National University, Acton, ACT 2601, Australia.Chungtia Senso Mokokchung Town, Mokokchung, Nagaland 798601, India.Indigenous Bioresources Research Group, Faculty of Science and Engineering, Macquarie University, North Ryde, Sydney 2109, Australia.Indigenous Bioresources Research Group, Faculty of Science and Engineering, Macquarie University, North Ryde, Sydney 2109, Australia. Electronic address: joanne.jamie@mq.edu.au.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

26969405

Citation

Akter, Kaisarun, et al. "Antimicrobial and Antioxidant Activity and Chemical Characterisation of Erythrina Stricta Roxb. (Fabaceae)." Journal of Ethnopharmacology, vol. 185, 2016, pp. 171-81.
Akter K, Barnes EC, Loa-Kum-Cheung WL, et al. Antimicrobial and antioxidant activity and chemical characterisation of Erythrina stricta Roxb. (Fabaceae). J Ethnopharmacol. 2016;185:171-81.
Akter, K., Barnes, E. C., Loa-Kum-Cheung, W. L., Yin, P., Kichu, M., Brophy, J. J., Barrow, R. A., Imchen, I., Vemulpad, S. R., & Jamie, J. F. (2016). Antimicrobial and antioxidant activity and chemical characterisation of Erythrina stricta Roxb. (Fabaceae). Journal of Ethnopharmacology, 185, 171-81. https://doi.org/10.1016/j.jep.2016.03.011
Akter K, et al. Antimicrobial and Antioxidant Activity and Chemical Characterisation of Erythrina Stricta Roxb. (Fabaceae). J Ethnopharmacol. 2016 Jun 5;185:171-81. PubMed PMID: 26969405.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Antimicrobial and antioxidant activity and chemical characterisation of Erythrina stricta Roxb. (Fabaceae). AU - Akter,Kaisarun, AU - Barnes,Emma C, AU - Loa-Kum-Cheung,Wendy L, AU - Yin,Ping, AU - Kichu,Meyanungsang, AU - Brophy,Joseph J, AU - Barrow,Russell A, AU - Imchen,Imchawati, AU - Vemulpad,Subramanyam R, AU - Jamie,Joanne F, Y1 - 2016/03/08/ PY - 2015/12/24/received PY - 2016/02/16/revised PY - 2016/03/07/accepted PY - 2016/3/13/entrez PY - 2016/3/13/pubmed PY - 2017/2/25/medline KW - Alpinum Isoflavone (PubChem CID: 54901393), Isovanillin (PubChem ID: 12127) KW - Antimicrobial KW - Antioxidant KW - Chemical constituents KW - Erythrina stricta KW - Isoflavanone KW - Luteone (PubChem CID: 5281797) KW - Obovatin (PubChem CID: 13940733) KW - Wighteone (PubChem ID: 5281814) SP - 171 EP - 81 JF - Journal of ethnopharmacology JO - J Ethnopharmacol VL - 185 N2 - ETHNOPHARMACOLOGICAL RELEVANCE: The bark of Erythrina stricta Roxb. (Fabaceae) has been used in Indian indigenous systems as a remedy for rheumatism, stomach-ache, asthma, dysentery, contact dermatitis, eczema and skin infections. However, there have been limited phytochemical or biological studies on the bark of E. stricta and there are no studies that align with its traditional medicinal uses. AIM OF THE STUDY: The aim of this study was to assess the antimicrobial and antioxidant activity of the stem bark of E. stricta to support its topical use in the treatment of contact dermatitis, eczema and skin infections and to isolate and identify any bioactive compounds. MATERIALS AND METHODS: MTT microdilution and disc diffusion assays were used to determine the antimicrobial activities of n-hexane, dichloromethane, ethyl acetate, methanol and water extracts of the bark of E. stricta. Column and preparative thin layer chromatography were used for the purification of the dichloromethane extract. The structures of the compounds isolated were elucidated by extensive 1D and 2D NMR spectroscopic techniques and comparison with published data. The antioxidant activities of the extracts were determined by DPPH free radical scavenging and FRAP assays and the antioxidant activity of the pure compounds by dot-blot and DPPH staining methods. RESULTS: The dichloromethane, ethyl acetate, and n-hexane extracts showed the most significant activity with MIC values of 7.8µg/mL, 125µg/mL, and 125µg/mL against a sensitive strain of Staphylococcus aureus. The dichloromethane and ethyl acetate extracts also showed significant activity against Candida albicans with MIC values of 125µg/mL and 1mg/mL respectively. GC-MS analysis of the n-hexane extract showed the presence of the antibacterial and antifungal compounds β-caryophyllene, caryophyllene oxide, α-selinene, β-selinene, selin-11-en-4-α-ol, α-copaene and δ-cadenine. Phytochemical studies of the dichloromethane extract led to the isolation of the novel compound erynone (1), together with six known compounds; wighteone (2), alpinum isoflavone (3), luteone (4), obovatin (5), erythrinassinate B (6) and isovanillin (7). Luteone (4) exhibited the most significant antibacterial activity with minimum inhibitory quantity (MIQ) values of 1.88µg, 1.88µg and 3.75µg, respectively, against sensitive (MSSA) and resistant strains (MRSA and MDRSA) of S. aureus using a TLC bioautography assay. Erynone (1) exhibited the greatest DPPH free radical scavenging activity. CONCLUSIONS: Seven compounds, including a new chromanone, were isolated from the antimicrobial dichloromethane extract of the stem bark of E. stricta. Six of the seven compounds showed antibacterial and/or antioxidant activities. These findings provide support for the customary (traditional and contemporary) use of E. stricta bark for the treatment of skin and wound infections. SN - 1872-7573 UR - https://www.unboundmedicine.com/medline/citation/26969405/Antimicrobial_and_antioxidant_activity_and_chemical_characterisation_of_Erythrina_stricta_Roxb___Fabaceae__ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0378-8741(16)30116-7 DB - PRIME DP - Unbound Medicine ER -