Esters-targeted colorimetric sensor array for the authenticity discrimination of strong-aroma baijiu with different origins.

Baijiu authenticity has been a frequent problem driven by economic interests in recent years, so it is important to discriminate against baijiu with different origins. Herein, we proposed a simple and efficient esters-targeted colorimetric sensor array mediated by hydroxylamine hydrochloride. Esters undergo a nucleophilic addition reaction with hydroxylamine hydrochloride to form hydroxamic acid, which rapidly forms a purplish red ferric hydroxamate under FeCl3·6H2O. Bromophenol blue and rhodamine B enrich the color effects. The array detected 12 esters with a detection limit on the order of 10-5 of most esters and 16 mixed esters with R2 > 0.999 and recoveries close to 100%. Otherwise, for discriminating 34 strong-aroma baijius (SABs), the array has an accuracy of 98% according to the origin, and 95% according to the grades, with a response time of 1 min. This study provides a new strategy for authenticity determination and quality control of baijiu. Copyright © 2024. Published by Elsevier Ltd.

Citation

Meixia Wu, Jinbin Zhang, Yao Fan, Hengye Chen, Songtao Wang, Caihong Shen, Haiyan Fu, Yuanbin She. Esters-targeted colorimetric sensor array for the authenticity discrimination of strong-aroma baijiu with different origins. Food chemistry. 2024 Sep 30;453:139560

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PMID: 38761721

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