Encapsulation of wild oregano [Plectranthus amboinicus (Lour.) Spreng] phenolic extract in baker’s yeast for the postharvest control of anthracnose in papaya.

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作者: Cristina C Uclaray, M. L. Vidallon, Ronaniel A Almeda, C. Cumagun, C. T. Reyes, E. B. Rodriguez
刊名: Journal of the science of food and agriculture
出版年: 2022-02-18
摘要: "BACKGROUND Anthracnose caused by Colletotrichum gloeosporioides is considered as a major postharvest disease affecting many fruits. This plant disease is traditionally managed with synthetic fungicides, which are generally toxic and are linked to pathogen resistance. Recently, microencapsulated bioactives are being developed as potential alternative strategies to these methods, while utilizing natural fungicides and other phytochemicals. Wild oregano [Plectranthus amboinicus (Lour.) Spreng] contains potent antimicrobial phenolics, but these compounds are volatile and relatively unstable, which limits their efficacy during application. Herein, a Baker's yeast microencapsulation system was applied to improve the stability of wild oregano phenolic extract (WOPE) and enhance its antifungal activity against anthracnose. RESULTS Encapsulation of WOPE in plasmolyzed yeast cells afforded a high encapsulation efficiency (93%) and yielded WOPE-loaded yeast microcapsules (WLYM) with an average diameter of 2.65 μm. Storage stability studies showed WLYM are stable for at least four months. A 24-h in vitro release experiment showed that WLYM had an initial burst release upon re-dispersion in water, followed by a controlled release to about 80% of the loaded WOPE. Upon application as a spray-type postharvest treatment for papaya, WLYM exhibited a significantly improved mycelial inhibitory action against C. gloeosporioides and greatly reduced the anthracnose symptoms in papaya fruits. CONCLUSION This study presented a yeast microencapsulation system that can effectively stabilize WOPE and enhance its antifungal activity, making this microparticle formulation a promising environmentally safe postharvest treatment option to combat anthracnose symptoms in papaya fruits. This article is protected by copyright. All rights reserved."
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