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

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

February 18, 2022

J Sci Food Agric. 2022 Feb 18. doi: 10.1002/jsfa.11826. Online ahead of print.

ABSTRACT

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.

PMID:35178723 | DOI:10.1002/jsfa.11826

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Patrick Blanchard MD

Meet Dr. Blanchard Dr. Blanchard’s medical practice is an embodiment of Integrative health which brings conventional and complementary approaches together in a coordinated way. Conveniently located in sunny Florida and over the internet with ValiseMD’s secure HIPPA compliant telXmed servers. Since 1994, patients with a wide range of challenging medical problems have achieved optimum health using the best of natural medicine, judiciously combined with high-tech innovations. Breakthroughs are often achieved even after patients have consulted mainstream specialists and holistic practitioners. Dr. Blanchard is founder and CEO of ValiseMD, Inc. He is board certified in Family Medicine since 1994 and awarded Fellow of the American Academy of Family Physicians in 2001. He received the ‘Teacher of the Year’ award from the University of Kansas School of Medicine at completion of his residency in Family Medicine. He completed a fellowship at Wake Forest University in the field of vascular neurosonology. He holds a medical patent in the field of Gastroenterology. He holds an unrestricted license to practice medicine and surgery in Florida. He started his medical career as a Emergency Medical Technician, then as a Paramedic and later a Medical Doctor.