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A colorimetric pH‐sensitive hydrogel indicator integrated with the smartphone for real‐time and visual food spoilage monitoring was developed. Herein, the poly(vinyl alcohol)/sodium alginate (PVA/SA) hydrogel was used as the carriers for the pH‐sensitive mixed‐dye methyl red/bromothymol blue (MR/BB), which can be employed as an amine indicator. The functional hydrogel was prepared by a simple freezing/thawing...
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