IIB   20738
INSTITUTO DE INVESTIGACIONES BIOLOGICAS
Unidad Ejecutora - UE
artículos
Título:
Revaluation of waste from fishing industry through generation of chitosan coatings to improve quality and extend shelf-life of minimally processed lettuce
Autor/es:
GOÑI, M.G.; ORTUETA, R.; ANDREU, A.B; GOÑI, M.G.; ORTUETA, R.; ANDREU, A.B; FASCIGLIONE, G.; PEREZ-BRAVO, J.J.; BUFFA, L.; FASCIGLIONE, G.; PEREZ-BRAVO, J.J.; BUFFA, L.; YOMMI, A.K; SCAMPINI, A.; CREUS, C.M; YOMMI, A.K; SCAMPINI, A.; CREUS, C.M
Revista:
POSTHARVEST BIOLOGY AND TECHNOLOGY
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2020 vol. 170 p. 1 - 9
ISSN:
0925-5214
Resumen:
Chitosan is obtained at industrial scale through a process of alkaline deacetylation of chitin the major waste of shrimp industry. Its utilization could both diminish industrial environmental impact and add value to foods and other industrial products. In this study, an industrial chitosan obtained in Argentina and a commercial chitosan were physicochemically characterized and evaluated as edible coating for biopreservation of minimally processedlettuce.BasedonNuclearMagneticResonance,X-raydiffractionandthermogravimetricandviscosimetric assays we conclude thatboth biopolymers havesimilarmolecular weight anddeacetylation degree. Thechitosan coatings were applied by spraying to lettuce leaves that had been removed and cleaned after the harvest. Each sample composed by four whole leaves, packed into a low-density polyethylene bag, was stored at 4 °C for 15 d. Microbial quality, weight and color losses, antioxidant contents, stomatal closure and sensorial attributes were evaluated during storage. An initial reduction of 2 log in molds and yeast counts were obtained for both types of chitosan coatings. As a result, the counts remained below the limit value of 6 log for 12 d in the chitosan coatings, while in the control samples this limit was reached 6 d after storage. Total mesophilic bacteria counts were also reduced by both types of chitosan coatings, keeping counts under the threshold value of 7 log for 12 d while in control samples this value was exceeded at 9 d. Both chitosans increased chlorophyll content, total phenolic compounds and antioxidant activity in lettuce leaves during the storage. Besides, the leaf weight loss was minimized by both chitosan coatings, in accordance to a higher proportion of stomatal partial closure as seen by SEM. The overall visual quality was not affected by chitosan coatings. In conclusion, the industrial chitosan showed similar effects on stored minimally processed lettuce than the commercial chitosan adding value to a material that is currently considered a waste.