Autor(es):
da Mata Cunha, Otávio [UNESP] ; Lima, Aline Margarete Furuyama [UNESP] ; Assis, Odílio Benedito Garrido ; Tiera, Márcio José [UNESP] ; de Oliveira Tiera, Vera Aparecida [UNESP]
Data: 2020
Identificador Persistente: http://hdl.handle.net/11449/200992
Origem: Oasisbr
Assunto(s): Biopolymeric films; Casting; Chitosan; Derivatives; Diethylaminoethyl; Biopolymeric films; Biopolymeric films; Casting; Casting; Chitosan; Chitosan; Derivatives; Derivatives; Diethylaminoethyl; Diethylaminoethyl
Descrição
Made available in DSpace on 2020-12-12T02:21:20Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-12-01
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Edible films and coatings can enhance the quality of food products, protecting them from biological deterioration, especially against fungal diseases and pathogenic microorganisms. In this study, films from chitosan, diethylaminoethyl-chitosan (DEAE-CH) and its hydrophobicized derivative DEAE-CH-DD were prepared by casting and their physicochemical and antimicrobial properties evaluated. The grafting with DEAE and dodecyl groups resulted in films with an elasticity modulus up to five times higher than commercial chitosan and increased water vapor permeability. Field emission gun - scanning electron microscopy and atomic force microscopy techniques showed films with smooth surfaces and the contact angle measurements revealed a correlation between the grafted group and hydrophilic/hydrophobic nature of the surface of the film. The amphiphilic derivatives exhibited better antimicrobial activity than unmodified chitosan against Penecillium expansum, Alternaria alternata and Alternaria solani. The amphiphilics DEAE-CH and DEAE-CH-DD showed no toxicity and delayed rotting and loss of water in strawberries and bananas, suggesting that this kind of film has great potential for increasing the shelf-life of different fruits.
Instituto de Biociências Letras e Ciências Exatas Universidade Estadual Paulista UNESP, Campus São José do Rio Preto, Departamento de Química e Ciências Ambientais, Laboratório de Biomateriais e Nanotecnologia, Cristóvão Colombo, 2265
Empresa Brasileira de Pesquisa Agropecuária EMBRAPA, Rua XV de Novembro, 1452
Instituto de Biociências Letras e Ciências Exatas Universidade Estadual Paulista UNESP, Campus São José do Rio Preto, Departamento de Química e Ciências Ambientais, Laboratório de Biomateriais e Nanotecnologia, Cristóvão Colombo, 2265
FAPESP: 2016/15736-0
FAPESP: 2017/13762-7
CAPES: PNPD 1267244
