Counting type sensing array indication label and preparation method and application thereof

Abstract

The invention discloses a counting type sensing array indication label and a preparation method and application thereof, and the counting type sensing array label screens out two or more chemical indicators responding to a single decay characteristic gas on the basis of a common colorimetric type freshness indication label or a colorimetric type array freshness indication label. The chemical indicators have the same color change range, but have different response sensitivities to spoilage characteristic gas. The chemical indicators are mixed according to different proportions, the moment of the same color can be found when the color change of the obtained mixed indicator is about to be finished, and the concentrations of the spoilage characteristic gases corresponding to different moments are different. Screened chemical indicators in different proportions are transferred and fixed to a base material according to a certain sequence to prepare a sensing array label, different numbers of array points reach the same color under different putrefying characteristic gas concentrations, and the food freshness can be deduced by counting the numbers of the array points.

Description

technical field [0001] The invention belongs to the field of food safety detection, and in particular relates to a counting sensor array indicator label, a preparation method of the sensor array label and an application in food freshness detection. [0002] technical background [0003] With the continuous improvement of living standards, people pay more and more attention to food safety. The freshness of food is one of the important factors affecting food quality and food safety. The freshness of food not only determines the price of commodities, but also a key indicator that affects consumers' willingness to purchase and the health of eaters. At present, food quality and safety indicators mainly include physical and chemical indicators (volatile basic nitrogen, referred to as TVB-N), microbial indicators (total bacterial colony, referred to as TVC) and sensory indicators. The former two require special instruments and equipment, and the detection operation process is cumb...

AI Technical Summary

Problems solved by technology

[0007] At present, traditional freshness indicator label substrates include silica gel plates, polytetrafluoroethylene plates, and PVDF films. Traditional colorimetric sensor arrays are usually made of glass, PVC (polyvinyl chloride) plates, PET (polyester) ) sheets, etc. These materials not only have high production costs, but also cause environmental pollution after post-processing, and the comprehensive effect is not high

Paper base has the advantages of light weight, low cost, good biocompatibility, and environmental friendliness, and is highly integrated with existing packaging forms, but the natural hydrophilicity of cellulose and the presence of a large number of pores in the fiber structure make it hydrophilic Sensitive indicators are easy to permeate and diffuse freely on it. How to obtain a consistent sensor cell array pattern on the surface of the paper base is another key issue in the preparation of high-quality paper-based sensor array labels.

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