Amines-mediated β-glucose pentaacetate to generate photoluminescent polymer-carbon nanodots for visual monitoring the freshness of shrimp

• Published in: Talanta (Oxford) 2022-11, Vol.249, p.123706-123706, Article 123706
• Main Authors: Zhang, Yaqin, Dong, Shengye, Chen, Jiaxin, Gao, Wenli, Shi, Xingbo
• Format: Article
• Language: English
• Subjects: Freshness of shrimp; Functional hydrogel; Polymer-carbon nanodots; Smartphone; Volatile amines
• ISSN: 0039-9140; 1873-3573
• DOI: 10.1016/j.talanta.2022.123706

In this paper, a portable fluorescence-based functional hydrogel loaded with β-d-glucose pentaacetate (β-D-GP) is designed for high-sensitive quantification of amine vapor and visual monitoring of freshness of shrimp. We found for the first time that amine vapor can mediate β-D-GP to generate photoluminescent polymer-carbon nanodots (PCNDs) with good optical properties. On this basis, a functional hydrogel sensing platform is simply formed by solidifying β-D-GP in agarose hydrogels. When exposure to the volatile amines released from the spoilage of shrimp, β-D-GP in hydrogel is immediately mediated by amines to generate PCNDs, resulting in obvious fluorescence-based color variation of functional hydrogel. Notably, a smartphone is used to obtain digital photographs and RGB (Red/Green/Blue) information of hydrogels for on-site quantitative analysis. The gray value of G/(R + B) of hydrogel shows good linearity with trimethylamine (TMA) vapor concentration in the range of 0–59.49 × 10−9 mol dm−3. More importantly, the G/(R + B) value of functional hydrogel is successfully used to assess the freshness of shrimp. Consequently, this strategy provides a low-cost, portable fluorescence analysis device with promising applications in achieving high-sensitive, nondestructive, and on-site food safety evaluation of animal-derived aquatic products. [Display omitted] •Amine vapor can mediate β-d-glucose pentaacetate to generate photoluminescent polymer-carbon nanodots.•A portable fluorescence-based functional hydrogel loaded with β-d-glucose pentaacetate is designed.•Photoluminescent polymer-carbon nanodots are generated in situ in hydrogels without additional synthesis.•Introduction of smartphone combined with RGB analysis greatly improves the practicality of monitoring on-site.•The hydrogel platform achieves highly sensitive, nondestructive and on-site monitoring of shrimp freshness.