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Paper-based colorimetric sensor array label and its preparation method and application

A sensor array and label technology, which is applied in the direction of analyzing materials through chemical reactions and analyzing materials through observing the impact on chemical indicators, can solve the problems of high production costs, environmental pollution, and low comprehensive effects. Achieve good consistency, avoid free diffusion, and good environmental effects

Active Publication Date: 2021-02-02
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition to silica gel plates, polytetrafluoroethylene plates, and PVDF membranes, traditional colorimetric sensor arrays usually use glass, PVC (polyvinyl chloride) plates, PET (polyester) sheets, etc. High, and the post-processing is easy to cause environmental pollution, the comprehensive effect is not high
The paper base has the advantages of light weight, good biocompatibility and environmental friendliness, but the natural hydrophilicity of cellulose and the presence of a large number of pores in the fiber structure make it easy for hydrophilic sensitive indicators to permeate and diffuse freely on it. , how to obtain a consistent sensor cell array pattern on the surface of the paper base is the key to the preparation of high-quality paper-based colorimetric sensor array labels

Method used

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  • Paper-based colorimetric sensor array label and its preparation method and application
  • Paper-based colorimetric sensor array label and its preparation method and application
  • Paper-based colorimetric sensor array label and its preparation method and application

Examples

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Effect test

Embodiment 1

[0030] The preparation method of the paper-based colorimetric sensor array label provided in the first embodiment includes the following steps:

[0031] Step 1: Soak the filter paper in 0.1% (v / v) n-hexane solution of octadecyltrichlorosilane (OTS) for 30 minutes, take it out and rinse it once with n-hexane and absolute ethanol respectively, through the coupling effect of organosilane A hydrophobic monomolecular layer is formed by self-assembly on the surface of paper fibers, and dried at 40°C to obtain an overall hydrophobized modified filter paper.

[0032] Step 2: On the filter paper obtained in step 1, cover a mask with a 3×3 array hole (round hole, the diameter of the array hole is 6mm), and place the side covering the mask upwards, and place it in a 185 / 254nm dual Wash for 20 hours under a wavelength ultraviolet lamp (power 8W), because the oxygen in the air will produce ozone under the action of 185nm ultraviolet light, so under the dual action of ultraviolet light and ...

Embodiment 2

[0045] The preparation method of the paper-based colorimetric sensor array label provided in the second embodiment includes the following steps:

[0046] Step 1: Soak the filter paper in n-hexane solution of octadecyltrichlorosilane (OTS) for 10 minutes, take it out and rinse it once with n-hexane and absolute ethanol respectively, and self-assemble on the surface of paper fibers through organosilane coupling to form a Layer hydrophobic monolayer, drying to obtain overall hydrophobic modified filter paper;

[0047] Step 2: Cover a mask with a 3×3 array of holes on the filter paper obtained in step 1, and place the side covering the mask upwards, and wash it under a 185 / 254nm dual-wavelength ultraviolet lamp for 10 hours, because Oxygen in the air will generate ozone under the action of 185nm ultraviolet light, so under the dual action of ultraviolet light and ozone, the alkyl chain will be broken to form hydrophilic aldehyde or carboxyl groups, thus obtaining the hydrophilic, ...

Embodiment 3

[0052] The preparation method of the paper-based colorimetric sensor array label provided in Example 3 includes the following steps:

[0053] Step 1: Soak the filter paper in n-hexane solution of octadecyltrichlorosilane (OTS) for 20 minutes, take it out and rinse it with n-hexane and absolute ethanol respectively, and self-assemble on the surface of paper fibers through organosilane coupling to form a Layer hydrophobic monolayer, drying to obtain overall hydrophobic modified filter paper;

[0054] Step 2: On the filter paper obtained in step 1), cover a mask with a 3×3 array of holes, place the side of the mask facing up, and wash it under a 185 / 254nm dual-wavelength ultraviolet light for 20 hours. Because the oxygen in the air will produce ozone under the action of 185nm ultraviolet light, under the dual action of ultraviolet light and ozone, the alkyl chain will be broken to form a hydrophilic aldehyde group or carboxyl group, so that the array hole area is hydrophilic , M...

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Abstract

The invention provides a paper-based colorimetric sensor array label and its preparation method and application. The preparation method includes: Step 1. Carrying out overall hydrophobic modification on filter paper through organosilane self-assembly; Step 2. The filter paper is partially cleaned with ultraviolet light to obtain a modified filter paper that is hydrophilic in the array hole area and hydrophobic in the periphery; Step 3: Prepare a series of sensitive indicator inks according to the characteristic gases of food spoilage; Step 4: Transfer the indicator inks to the modified filter paper On the corresponding array area, after drying, a paper-based colorimetric sensor array label is obtained. The paper-based colorimetric sensor array label prepared by the technical scheme has the advantages of environmental friendliness, natural degradation, good consistency of sensing units, and high reliability. When it is used as an indicator of food freshness, the "fingerprint" of the front and back array labels can not only accurately indicate the spoilage point of the food, but also provide a subdivided indication of its freshness.

Description

technical field [0001] The invention belongs to the field of food safety detection, and in particular relates to a paper-based colorimetric sensor array label, a preparation method of the sensor array label and an application for 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 黎厚斌黄少云张凌旋陈露陈良哲刘兴海
Owner WUHAN UNIV
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