Resumo

HERNANDEZ GUERRERO, S. E. et al. Microbiological evaluation of coatings starch-based extracted from tropical fruits during postharvest storage. Revista bio ciencias [online]. 2023, vol.10, e1475.  Epub 23-Fev-2024. ISSN 2007-3380.  https://doi.org/10.15741/revbio.10.e1475.

Starch-based edible coatings, in addition to preserving organoleptic properties, also allow for gas exchange. This study aimed to evaluate the microbiological activity of three starch-based coatings. Starch was extracted from banana, mango, and soursop fruit and applied to stenospermocarpic ‘Ataulfo’ mango fruit during postharvest storage. From a batch of mango fruit, 1 cm2 segments of affected tissue were sectioned, placed on potato dextrose agar, and incubated for seven days and selecting strains. A pathogenicity test was carried out by inoculating fruit with 10 µL of a spore suspension at 1x106 mL-1 of each of the eight previously isolated strains. These were labeled CP (Pathogenic Strain). A highly aggressive strain was morphologically identified and selected for qualitative and quantitative damage evaluation. An in vivo microbiological evaluation was made using stenospermocarpic ‘Ataulfo’ mango fruit coated with 2 % (w/v) starch and inoculated with CP3. Moderate damage was observed in the control fruit and slight visible damage was observed in the coated and inoculated fruit. Mango coating inhibited the CP3 strain damage by 66.91 % at eight days of storage. Starch-based coatings for horticultural products help to reduce damage caused by microorganisms during postharvest handling.

Palavras-chave : Anthracnose; Colletotrichum sp.; Mangifera indica; pathogenicity; stenospermocarpy..