Naked-eye detection pH sensor is becoming a powerful tool in food safety monitoring. In this work, a pH sensor was developed by incorporating cellulose modified with acidochromic dye into polyvinyl alcohol (PVA). The results indicated that the dye (up to 170.4 μmol/g) was successfully anchored to cellulose. It was demonstrated that the addition of acidochromic regenerated cellulose (ARC) resulted in enhancement of tensile strength, elongation at break and maximum decomposition temperature by 44 %, 43.6 % and 11 °C, respectively. The pH sensor demonstrated that a visible color change from yellow to brick-red and to purple when placed in solutions of pH = 7, 10 and 12. The pH sensor showed excellent resistance to leaching under strong acidic and alkaline conditions. When applied to spoiled shrimp, an evident color change from yellow to brown was observed, suggesting it could serve as an easy-to-use, non-destructive visual indicator system for real-time food monitoring.

中文翻译：

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肉眼检测基于聚乙烯醇/纤维素的pH传感器，用于智能包装。

裸眼检测pH传感器正成为食品安全监控中的强大工具。在这项工作中，通过将用酸性变色染料改性的纤维素掺入聚乙烯醇（PVA）中来开发pH传感器。结果表明，染料（高达170.4μmol/ g）已成功锚固在纤维素上。结果表明，添加酸性变色再生纤维素（ARC）可使抗张强度，断裂伸长率和最大分解温度分别提高44％，43.6％和11°C。pH传感器显示，当置于pH = 7、10和12的溶液中时，可见的颜色从黄色变为砖红色和紫色。pH传感器在强酸性和碱性条件下显示出优异的耐浸出性。当应用于变质的虾时，