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A renewable indicator based on polyaniline (PANI) was developed and was able to indicate the freshness of tilapia. Hydrochloric acid was used in preparation of doped PANI, and experiments on colour variations of PANI films during spoilage of tilapia were conducted under accelerate storage condition (30°C) and chilled condition (4°C). When stored under 30°C, significant colour change of PANI film from...
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