Leptospermum petersonii as a Potential Natural Food Preservative.

Autor: Afolabi WO; Department of Chemistry, Cape Peninsula University of Technology, Bellville 7535, South Africa., Hussein A; Department of Chemistry, Cape Peninsula University of Technology, Bellville 7535, South Africa., Shode FO; Department of Biotechnology and Food Technology, Durban University of Technology, Durban 4000, South Africa., Le Roes-Hill M; Applied Microbial and Health Biotechnology Institute, Cape Peninsula University of Technology, Bellville 7535, South Africa., Rautenbach F; Applied Microbial and Health Biotechnology Institute, Cape Peninsula University of Technology, Bellville 7535, South Africa.
Jazyk: angličtina
Zdroj: Molecules (Basel, Switzerland) [Molecules] 2020 Nov 24; Vol. 25 (23). Date of Electronic Publication: 2020 Nov 24.
DOI: 10.3390/molecules25235487
Abstrakt: Leptospermum petersonii (family Myrtaceae ) is often cultivated for ornamental purposes but also serves as a rich source of bioactive essential oils. While several studies focused on the activities of the essential oils, this study analysed the potential of spent L. petersonii leaves as a natural food preservative.
Method: We investigated the in vitro antioxidant and antimicrobial activities of crude L. petersonii extracts against activities of the purified isolated flavonoid, 6-methyltectochrysin, which was characterized using spectroscopic methods. The antioxidant assays followed ORAC, FRAP and TEAC tests. The antimicrobial activities of the extract and purified flavonoid were analysed against six multi-drug resistant microbial strains in broth dilution assays.
Result: The results revealed that both the crude extracts and isolated 6-methyltectochrysin exhibited positive radical ion scavenging antioxidant potential, however the crude extract was about 6-fold more potent antioxidant than the purified 6-methyltectochrysin. The crude extract also showed strong antimicrobial activities against Bacillus cereus , and even more potent antimicrobial agent than the reference ampicillin antibiotic against Klebsiella pneumoniae subsp. pneumoniae. A higher resistance was observed for the tested Gram-negative strains than for the Gram-positive ones. 6-methyltectochrysin was generally inactive in the antimicrobial assays.
Conclusion: The crude methanolic extract showed significant bioactivity which validates the medicinal relevance of the plant. The observed biological activities, especially against a notorious strain of B. cereus, suggest that L. petersonii could be a promising natural source of food preservatives.
Databáze: MEDLINE
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