Intelligent pH indicator films containing anthocyanins extracted from blueberry peel for monitoring tilapia fillet freshness
Intelligent pH indicator films containing anthocyanins extracted from blueberry peel for monitoring tilapia fillet freshness
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含有从蓝莓皮中提取的花青素的智能pH指示剂膜，用于监测罗非鱼片新鲜度
DOI：
10.1002/jsfa.10794
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发表时间：
2020
影响因子：
4.1
通讯作者：
Zhou Zhongyun
中科院分区：
文献类型：
--
作者：
Shi Ce;Zhang Jiaran;Jia Zhixin;Yang Xinting;Zhou Zhongyun
鱼腐败导致鱼的pH值增加。比色pH指示剂可用于监测鱼的腐败程度，由于其简单、实用、成本低，已被开发用于智能包装。本研究的目的是开发两种由淀粉（S）、塔拉胶（TG）、聚乙烯醇（PVA）和从蓝莓皮中提取的花青素组成的pH指示膜，然后使用所述膜监测罗非鱼片在25和4 °C贮藏期间的新鲜度。傅立叶变换红外光谱、紫外可见分光光度法和扫描电镜证实蓝莓皮提取物（BPE）已被引入S/PVA和TG/PVA基体中。在pH 2-8下，膜中发生视觉颜色变化。在4 ° C和25 °C下储存的罗非鱼片中进行新鲜度应用测试，并观察膜中的视觉颜色变化。TG/PVA/BPE膜在25 °C下从粉红色透明到暗黄色和在4 °C下到深紫色的色差（ΔE）比S/PVA/BPE膜的Δ E大，与鱼片的挥发性盐基氮（TVB-N）和需氧菌总数（TACs）的变化有充分的相关性。BPE薄膜与罗非鱼片的TVB-N和TAC值相对应，这表明BPE薄膜作为视觉包装标签在环境温度和冷藏温度下监测鱼的新鲜度具有很大的潜力。© 2020化学工业学会
BACKGROUNDFish spoilage leads to an increase in the pH value of the fish. A colorimetric pH indicator can be used to monitor fish spoilage and has been exploited in intelligent packaging because of its simplicity, practicality and low cost. The aim of this study was to develop two pH‐indicator films comprising starch (S), tara gum (TG), polyvinyl alcohol (PVA) and anthocyanins extracted from blueberry peel and the films were then used to monitor the freshness of tilapia fillets during storage at 25 and 4 °C.RESULTSThe ultraviolet‐visible (UV‐visible) spectra and color of anthocyanins changed within pH 2–10. Fourier‐transform infrared spectroscopy, UV‐visible spectrophotometry and scanning electron microscopy certified that blueberry peel extract (BPE) had been introduced into the S/PVA and TG/PVA matrices. Visual color changes in the films occurred at pH 2–8. A freshness application test was conducted in tilapia fillets stored at 4 and 25 °C, and visual color changes in the films were observed. The TG/PVA/BPE film had a greater color difference (ΔE) from pink and transparent to dark yellow at 25 °C and to dark purple at 4 °C than ΔEof S/PVA/BPE film, which sufficiently correlated with the change of total volatile base nitrogen (TVB‐N) and total aerobic counts (TACs) of fillets.CONCLUSIONIt can be concluded that the color changes of TG/PVA/BPE films were corresponded with TVB‐N and TAC values of tilapia fillets, which presented great potential as a visual package label to monitor fish freshness at ambient and chilled temperatures. © 2020 Society of Chemical Industry