Preparation of pH‐indicator films based on soy protein isolate/bromothymol blue and methyl red for monitoring fresh‐cut apple freshness

溴百里酚蓝 pH指示剂 化学 大豆蛋白 傅里叶变换红外光谱 水活度 酚红 吸附 核化学 色谱法 化学工程 含水量 吸附 有机化学 食品科学 岩土工程 工程类
作者
Ruimin Ran,L L Wang,Yuhang Su,Shujian He,Binbin He,Cheng Li,Caixia Wang,Yuntao Liu,Saiyan Chen
出处
期刊:Journal of Food Science [Wiley]
卷期号:86 (10): 4594-4610 被引量:24
标识
DOI:10.1111/1750-3841.15884
摘要

Intelligent pH-indicator films based on soy protein isolate (SPI) were prepared using pH-sensitive dyes (bromothymol blue and methyl red). The addition of mixed indicators imparts pH-indicator films with an appreciable microstructure, acceptable water resistance, and favorable optical properties. The incorporation of the mixed indicators did not lead to significant improvement in the mechanical properties of films due to weak ionic cross-linking by hydrogen bonding between the SPI macromolecules and low-molecular-weight indicators. Fourier-transform infrared spectroscopy indicated hydrogen bond-mediated intermolecular interactions, and scanning electron microscopy showed that BB/MR were well dispersed in the SPI film. The indicator addition hindered the sorption and passage of water molecules. The water vapor permeability, moisture sorption, moisture content, and total soluble matter were 4.32 to 6.12 ×10-12 g·cm/cm2 ·s·Pa, 36.70% to 73.33%, 25.28% to 44.11%, and 8.21% to 25.56%, respectively. Also, the addition of indicators reduced UV light transmittance with minimal effect on the transparency of the film. The presence of indicators enhanced the pH sensitivity, seen as a visible color reaction at different pHs (total color difference, ΔE > 5). When the pH-indicator film containing 8 ml/100 ml final film emulsions was used to monitor the fresh-cut apple freshness, a green color for fresh status was observed, which turned blue after 60 h. Collectively, our findings suggested that indicator-containing SPI films have the potential for monitoring the freshness of fruits. PRACTICAL APPLICATION: pH-indicator films can help consumers to identify the freshness of packaged food by a change in the color of the packaging material, which is easily visible to the unaided eye without the need for opening the packaging. This protects consumers' interests.
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