Jiayue Zhou, Dong Li, Yanqun Xu, Xiaochen Zhang, Lei Wang, Lin Zhou, Liang Zou, Zisheng Luo
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引用次数: 0
Abstract
(E)-2-Hexenal (E2H) is an important volatile organic compound (VOC) that can serve as a marker for fruit quality sensing and shelf-life evaluation. However, visual and portable sensors for E2H have not been reported mainly because of the difficulty in selective response to E2H while avoiding interference from other VOC, especially isomers. Herein, we developed a novel colorimetric sensor based on thiol-functionalized polydiacetylene assembly (PDA-SH/PDA) for the quantitative and selectivity of E2H. The mechanism was that E2H underwent a Michael addition reaction with sulfhydryl groups in PDA-SH/PDA. The Michael addition reaction destroyed the hydrogen bond and distorted the conjugated molecular system, resulting in colorimetric responses. Under optimal conditions, a good linear relationship was observed between E2H concentration and red colorimetric shift (R2 = 0.9679). The E2H sensor yields a high analytical sensitivity of 1.5203% and a limit of detection of 0.015 g L−1. Besides, the PDA-SH/PDA sensor can be used to visually distinguish E2H and its isomer (Z)-3-hexenal. The PDA-SH/PDA sensor yielded a statistically significant difference in red colorimetric shift (p < 0.01) between the pairs of isomers in the ripeness of fruits. At last, the sensor was utilized for detecting E2H in grapes from different shelf lives. We found that the E2H concentration increased from 66.16 ± 1.54 to 67.56 ± 1.30 µg L−1 as storage time was prolonged. The results of this research not only demonstrated the feasibility of visual and on-site detection of E2H but also provided potential promise for portable fruit quality sensing and shelf-life evaluation.
(E)-2-己烯醛(E2H)是一种重要的挥发性有机化合物(VOC),可作为果实品质感知和货架期评价的标志物。然而,E2H的视觉和便携式传感器尚未报道,主要是因为难以对E2H做出选择性响应,同时避免其他VOC的干扰,特别是同分异构体。在此,我们开发了一种基于巯基功能化聚二乙炔组件(PDA- sh /PDA)的新型比色传感器,用于E2H的定量和选择性。其机理是E2H与PDA- sh /PDA中的巯基发生Michael加成反应。迈克尔加成反应破坏了氢键,扭曲了共轭分子体系,导致比色反应。在最佳条件下,E2H浓度与红比色位移呈良好的线性关系(R2 = 0.9679)。E2H传感器的分析灵敏度为1.5203%,检测限为0.015 g L-1。此外,PDA- sh /PDA传感器可用于视觉区分E2H及其异构体(Z)-3-己烯醛。随着储存时间的延长,PDA- sh /PDA传感器产生的红色比色位移(p -1)具有统计学意义。本研究结果不仅证明了E2H可视化和现场检测的可行性,而且为便携式水果品质检测和货架期评价提供了潜在的前景。
期刊介绍:
The goal of the Journal of Food Science is to offer scientists, researchers, and other food professionals the opportunity to share knowledge of scientific advancements in the myriad disciplines affecting their work, through a respected peer-reviewed publication. The Journal of Food Science serves as an international forum for vital research and developments in food science.
The range of topics covered in the journal include:
-Concise Reviews and Hypotheses in Food Science
-New Horizons in Food Research
-Integrated Food Science
-Food Chemistry
-Food Engineering, Materials Science, and Nanotechnology
-Food Microbiology and Safety
-Sensory and Consumer Sciences
-Health, Nutrition, and Food
-Toxicology and Chemical Food Safety
The Journal of Food Science publishes peer-reviewed articles that cover all aspects of food science, including safety and nutrition. Reviews should be 15 to 50 typewritten pages (including tables, figures, and references), should provide in-depth coverage of a narrowly defined topic, and should embody careful evaluation (weaknesses, strengths, explanation of discrepancies in results among similar studies) of all pertinent studies, so that insightful interpretations and conclusions can be presented. Hypothesis papers are especially appropriate in pioneering areas of research or important areas that are afflicted by scientific controversy.