Development and Evaluation of a Novel pH Indicator Biodegradable Film Based on Cassava Starch


Autoria(s): VEIGA-SANTOS, P.; DITCHFIELD, C.; TADINI, C. C.
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

19/10/2012

19/10/2012

2011

Resumo

A pH indicator film based on cassava starch plasticized with sucrose and inverted sugar and incorporated with grape and spinach extracts as pH indicator sources (anthocyanin and chlorophyll) has been developed, and its packaging properties have been assessed. A second-order central composite design (2(2)) with three central points and four star points was used to evaluate the mechanical properties (tensile strength, tensile strength at break, and elongation at break percentage), moisture barrier, and microstructure of the films, and its potential as a pH indicator packaging. The films were prepared by the casting technique and conditioned under controlled conditions (75% relative humidity and 23 degrees C), at least 4 days before the analyses. The materials were exposed to different pH solutions (0, 2, 7, 10, and 14) and their color parameters (L*, a*, b*, and haze) were measured by transmittance. Grape and spinach extracts have affected the material characterization. Film properties (mechanical properties and moisture barrier) were strongly influenced by extract concentration presenting lower results than for the control. Films containing a higher concentration of grape extract presented a greater color change at different pH`s suggesting that anthocyanins are more effective as pH indicators than chlorophyll or the mixture of both extracts. (C) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 120: 1069-1079,2011

Brazilian Committee for Postgraduate Courses in Higher Education (CAPES)

State of Sao Paulo Research Foundation (FAPESP)

Identificador

JOURNAL OF APPLIED POLYMER SCIENCE, v.120, n.2, p.1069-1079, 2011

0021-8995

http://producao.usp.br/handle/BDPI/26795

10.1002/app.33255

http://dx.doi.org/10.1002/app.33255

Idioma(s)

eng

Publicador

WILEY-BLACKWELL

Relação

Journal of Applied Polymer Science

Direitos

restrictedAccess

Copyright WILEY-BLACKWELL

Palavras-Chave #biodegradable films #mechanical properties #pH indicator #barrier #cassava starch #EDIBLE FILMS #PHYSICAL-PROPERTIES #SODIUM CASEINATE #ESSENTIAL OIL #GUM FILMS #BARRIER #BLENDS #COLOR #Polymer Science
Tipo

article

original article

publishedVersion