Colorimetric indicator based on zwitterionic anti-freezing hydrogel and alizarin for visual monitoring of salmon fillets freshness  

作　　者：Yanan Liu Huan Li Jian Chen Jiesi Feng Renjie Lian Linglin Fu Yanbo Wang 

机构地区：[1]Food Safety Key Laboratory of Zhejiang Province,School of Food Science and Biotechnology,Zhejiang Gongshang University,Hangzhou 310018,China [2]Jinghai Group Co.,Ltd.,Rongcheng 264300,China [3]School of Food and Health,Beijing Technology and Business University,Beijing 100048,China

出　　处：《Journal of Future Foods》2024年第2期135-141,共7页未来食品学报（英文）

基　　金：the Key Program of Natural Science Foundation of Zhejiang Province(LZ15C200001);the Zhejiang Provincial Department of Agriculture and Rural Affairs(2022SNJF020;2022SNJF069).

摘　　要：Indicating hydrogels have shown the advantages of being fast, sensitive, and real-time in demonstrating the freshness of aquatic products due to their noticeable color change. In this work, an anti-freezing hydrogel embedded with pH-sensitive alizarin was developed as an original colorimetric indicator for monitoring the corruption of aquatic products at low temperatures. The anti-freezing hydrogel was prepared from 2-carboxyethyl acrylate, [2-(methacryloyloxy)ethyl]-trimethylammonium chloride, and 2-hydroxyethyl methacrylate monomers with triethylene glycol dimethacrylate as cross-linking agent. The hydrogel showed excellent anti-freezing capability, which was further incorporated with the pH-sensitive dye alizarin to gain the indicating capability. When applied in the indication of the freshness of salmon under low-temperature storage, it was found that the color changes of the indicator corresponded with the total volatile basic nitrogen contents of salmon, the correlation coefficient of which was 0.959 6. These results indicated the application potential of the hydrogels as freshness indicators during low-temperature storage or cold-chain transportation.

关 键 词：Colorimetric indicator ALIZARIN Zwitterionic hydrogel Food freshness Visual monitoring 

分 类 号：TS201.2[轻工技术与工程—食品科学]