食物腐败
壳聚糖
化学
纤维素
食品科学
巴氏杀菌
活性包装
食品包装
pH指示剂
甲基纤维素
有机化学
遗传学
生物
细菌
作者
Fahimeh Ebrahimi Tirtashi,Mehran Moradi,Hossein Tajik,Mehrdad Forough,Parya Ezati,Bambang Kuswandi
标识
DOI:10.1016/j.ijbiomac.2019.06.148
摘要
In this study, the possible use of anthocyanins of black carrot (ABC) as a chemo-responsive dye to fabricate a colorimetric pH indicator in a cellulose-chitosan matrix was investigated in order to the monitoring of spoilage in pasteurized milk. Cellulose paper was impregnated with a chitosan solution prepared by a sol-gel method containing ABC (total anthocyanins content of 10 mg/100 mL) and characterized. The swelling and water solubility increased by incorporation of ABC into the chitosan-cellulose film. The colorimetric pH indicator showed an obvious color variation from pink to khaki at different pH values (pH 2-11). Stability tests revealed that the indicator had acceptable color stability during one-month storage at 20 °C. The results also confirmed the immobilization of ABC into the matrix of the polymeric indicator with no significant effect on the chemical and super-molecular structure of the samples. In food trial, fresh pasteurized milk was entirely discerned through a perceptible color change from blue to violet rose color after 48 h storage at 20 °C, which was comfortably observable by the naked eye. The results proved that the fabricated indicator could be used as food grade biomaterials to monitor freshness/spoilage of milk.
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