Leptospermum petersonii as a Potential Natural Food Preservative

Leptospermum petersonii as a Potential Natural Food Preservative

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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: jilungin dreaming tea 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 acupatch 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.