Formulation of the biological control yeast Meyerozyma caribbica by electrospraying process: effect on postharvest control of anthracnose in mango (Mangifera indica L.) and papaya (Carica papaya L.)

Background Microorganism for biological control of fruit diseases is an eco-friendly alternative to the use of chemical fungicides. Results This is the first study evaluating the electrospraying process to encapsulate the biocontrol yeast Meyerozyma caribbica. The effect of encapsulating material (Wey protein concentrate (WPC), Fibersol® and Trehalose), its concentration and storage temperature on the cell viability of M. caribbica, and in vitro and in vivo control of Colletotrichum gloeosporioides was evaluated. The processing with commercial resistant maltodextrin (Fibersol®) 30% (w/v) as encapsulating material showed the highest initial cell viability (95.97 ± 1.01%). The storage at 4 ± 1 °C showed lower losses of viability compared to 25 ± 1 °C. Finally, the encapsulated yeast with Fibersol 30% w/v showed inhibitory activity against anthracnose in the in vitro and in vivo tests, similar to yeast fresh cells. Conclusion Electrospraying was a highly efficient process due to the high cell viability, and consequently, a low quantity of capsules are required for the postharvest treatment of fruits. Additionally, the yeast retained its antagonistic power during storage. This article is protected by copyright. All rights reserved.