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Zein films with unoxidized or oxidized tannic acid.
Santos, Talita M; Souza Filho, Men de Sá M; Muniz, Celli R; Morais, João Paulo S; Kotzebue, Lloyd Ryan Viana; Pereira, André Luís Sousa; Azeredo, Henriette Mc.
Afiliação
  • Santos TM; Chemical Engineering Department, Federal University of Ceara, Fortaleza, CE, Brazil.
  • Souza Filho MSM; Embrapa Tropical Agroindustry, Fortaleza, CE, Brazil.
  • Muniz CR; Embrapa Tropical Agroindustry, Fortaleza, CE, Brazil.
  • Morais JPS; Embrapa Cotton, Campina Grande, PB, Brazil.
  • Kotzebue LRV; Department of Chemistry, Federal University of Ceara, Fortaleza, CE, Brazil.
  • Pereira ALS; Department of Chemistry, Federal University of Ceara, Fortaleza, CE, Brazil.
  • Azeredo HM; Embrapa Tropical Agroindustry, Fortaleza, CE, Brazil.
J Sci Food Agric ; 97(13): 4580-4587, 2017 Oct.
Article em En | MEDLINE | ID: mdl-28345222
BACKGROUND: Corn zein is a predominatly hydrophobic protein, forming films with relatively good water resistance. Tannic acid, especially in its oxidized form, is supposed to cross-link proteins including zein, which may be explored to further enhance the water resistance of zein films. The effects of different contents (0-8 wt%) of unoxidized and oxidized tannic acid (uTA and oTA, respectively) on the properties of zein films at different pH values (4-9) were studied, according to central composite designs. RESULTS: Increasing tannic acid contents and pH values resulted in decreased water solubility and increased tensile strength and modulus of films. The presence of tannic acid provided the films with a yellowish color and increased opacity. Paired t-tests indicated that oTA films presented higher tensile strength, lower water vapor permeability and lower water solubility than uTA films. CONCLUSION: Higher tannic acid contents and pH values resulted in films with better overall physical properties, which might be ascribed to cross-linking, although the films were still not water resistant. The resulting films have potential to be used for food packaging and coating applications. © 2017 Society of Chemical Industry.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Taninos / Zeína / Embalagem de Alimentos Idioma: En Revista: J Sci Food Agric Ano de publicação: 2017 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Taninos / Zeína / Embalagem de Alimentos Idioma: En Revista: J Sci Food Agric Ano de publicação: 2017 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido