Ratiometric fluorescent paper chip for monitoring the freshness of high protein foods

IF 5.7 2区 化学 Q1 CHEMISTRY, ANALYTICAL Analytica Chimica Acta Pub Date : 2024-11-13 DOI:10.1016/j.aca.2024.343418
Guobin Mao , Yuan Zeng , Chunmin Qiu , Guangmiao Ding , Leyao Li , Lixin Ma , Junbiao Dai , Wen Yin , Yingxin Ma
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Abstract

Accurately monitoring the freshness of high-protein foods has significant implications for both food safety and public welfare. Since a large amount of hydrogen sulfide (H2S) is produced during spoilage-related processes, abnormal H2S levels are often considered an important indicator of food spoilage. Therefore, we synthesized novel nanoparticles (NPs) containing Silicon (Si) dots and CdTe quantum dots to accurately assess the amount of sulfide ions (S2−) and thus the quality of high-protein foods in the early stage of storage. As the concentration of S2− increased, the fluorescence intensity of Si/CdTe NPs at λem = 488 nm increased, while the fluorescence intensity at λem = 620 nm was quenched. The fluorescence intensity ratio (F620/F488) was negatively linearly correlated to S2− concentrations in the range of 1–20 μM, with a detection limit of 0.3 μM. Furthermore, to achieve portable detection, we mixed Si/CdTe NPs with sodium carboxymethyl cellulose to prepare effective visual fluorescent sensing paper chips, which exhibited ideal porous structure, good particle dispersion, and excellent fluorescence properties. Incubating the paper chips with high-protein foods allowed for accurate monitoring of food freshness during storage. Therefore, this approach provided a reliable and portable method to determine H2S concentration using a novel concept to ensure the freshness and safety of high-protein foods.

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用于监测高蛋白食品新鲜度的比率荧光纸芯片
准确监测高蛋白食品的新鲜度对食品安全和公众福利都有重大意义。由于在腐败相关过程中会产生大量硫化氢(H2S),因此 H2S 含量异常通常被认为是食品腐败的一个重要指标。因此,我们合成了含有硅(Si)点和碲化镉(CdTe)量子点的新型纳米粒子(NPs),用于准确评估硫化氢离子(S2-)的含量,从而评估高蛋白食品在储存初期的质量。随着 S2- 浓度的增加,Si/CdTe NPs 在 λem = 488 nm 处的荧光强度增加,而在λem = 620 nm 处的荧光强度熄灭。在 1 到 20 μM 的范围内,荧光强度比(F620/F488)与 S2- 浓度呈负线性关系,检测限为 0.3 μM。此外,为了实现便携式检测,我们将 Si/CdTe NPs 与羧甲基纤维素钠混合,制备了有效的可视荧光传感纸片,该纸片具有理想的多孔结构、良好的颗粒分散性和优异的荧光特性。将纸片与高蛋白食品一起培养,可以准确监测食品在储存过程中的新鲜度。因此,这种方法提供了一种可靠、便携的方法,利用新概念测定 H2S 浓度,以确保高蛋白食品的新鲜度和安全性。
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来源期刊
Analytica Chimica Acta
Analytica Chimica Acta 化学-分析化学
CiteScore
10.40
自引率
6.50%
发文量
1081
审稿时长
38 days
期刊介绍: Analytica Chimica Acta has an open access mirror journal Analytica Chimica Acta: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Analytica Chimica Acta provides a forum for the rapid publication of original research, and critical, comprehensive reviews dealing with all aspects of fundamental and applied modern analytical chemistry. The journal welcomes the submission of research papers which report studies concerning the development of new and significant analytical methodologies. In determining the suitability of submitted articles for publication, particular scrutiny will be placed on the degree of novelty and impact of the research and the extent to which it adds to the existing body of knowledge in analytical chemistry.
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