Paper base color comparison-type sensor array label and preparation method and application thereof

A sensor array and colorimetric technology, which is applied in the direction of analyzing materials through chemical reactions and observing the influence of chemical indicators, etc., can solve the problems of low comprehensive effect, high production cost, environmental pollution, etc. problem, to achieve the effect of good environmental effect, good consistency, and avoid free diffusion

Active Publication Date: 2020-01-14
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 base color comparison-type sensor array label and preparation method and application thereof
  • Paper base color comparison-type sensor array label and preparation method and application thereof
  • Paper base color comparison-type sensor array label and preparation method and application thereof

Examples

Experimental program
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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 present invention provides a paper base color comparison-type sensor array label and a preparation method and application thereof. The preparation method comprises: step 1: performing overall hydrophobic modification on filter paper through organosilane self-assembly; step 2: using ultraviolet light to perform local cleaning on the filter paper that undergoes overall modification, to obtain modified filter with a hydrophilic paper array hole area and a hydrophobic periphery; step 3: preparing a series of sensitive indicator ink according to food spoilage characteristic gas; and step 4: transferring the indicator ink to a corresponding array area of the modified filter paper, and performing drying to obtain the paper base color comparison-type sensor array label. The paper base color comparison-type sensor array label prepared by using the technical solution has advantages of being friendly to environment, capable of natural degradation, good in sensing unit consistency, high in reliability and the like. When the paper base color comparison-type sensor array label is applied to food freshness indication, a fingerprint spectrum of the array label before and after package can be used for not only accurately indicating a corruption point of food, but also performing extended indication on freshness of the food.

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 Applications(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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