Paper-based test paper for rapidly detecting lead in tea leaves by applying ion imprinting color development

An ion imprinting, paper-based technology, applied in the direction of chemical reaction of materials, material analysis by observing the influence of chemical indicators, etc., can solve the problems of cumbersome operation, long time consumption, etc. stable effect

Pending Publication Date: 2022-03-22
ZHEJIANG FORESTRY UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a paper-based test paper that uses ion imprinting color development to quickly detect lead in tea, which can be used as a lateral flow platform to detect Pb 2+ The enrichment device of the paper-based imprinted material is assembled into the paper-based platform to make a new side flow platform, which realizes the one-step process of sample loading and enrichment, and overcomes the problems of cumbersome operation and long time-consuming in the traditional scheme

Method used

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  • Paper-based test paper for rapidly detecting lead in tea leaves by applying ion imprinting color development
  • Paper-based test paper for rapidly detecting lead in tea leaves by applying ion imprinting color development
  • Paper-based test paper for rapidly detecting lead in tea leaves by applying ion imprinting color development

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Embodiment 1

[0042] according to Figure 1-Figure 6 The present invention provides a paper-based test paper for rapid detection of lead in tea leaves by using ion imprinting color development, including a paper base and a lead ion imprinted film constructed on the surface of the paper base, and the lead ion imprinted film is formed on paper by a sol-gel method. The paper-based substrate includes neutral filter paper, PVC membrane, Whatman filter paper or nitrocellulose membrane, and the surface of the paper-based substrate can allow the solution to pass quickly to the enrichment area.

[0043] The base material of the lead ion imprinted membrane is natural cellulose. The natural cellulose material is quantitative filter paper, soft facial tissue or cloth, and the natural cellulose is formed by interweaving many microfibers and nanometer-level fiber nets.

[0044] Wherein, comprise the preparation method of this paper-based test paper, concrete steps are as follows:

[0045] S1. Paper bas...

Embodiment 2

[0053] The paper-based test paper is FP@IIP-Pb 2+ Paper-based imprinting material, its preparation method comprises the steps:

[0054] (1) prepare 10mL hydrochloric acid, the concentration is 0.2M, soak filter paper in hydrochloric acid and clean, take out and wash with ultrapure water until neutral, dry, obtain the filter paper after cleaning;

[0055] (2) Immerse the cleaned filter paper in the PAA aqueous solution, and after ultrasonication for 30 minutes, take it out, wash it with ultrapure water, and dry it to obtain a PAA-modified paper base;

[0056] (3) Configure 0.01mol / L-0.02mol / L lead nitrate, the solvent is ethanol aqueous solution (ethanol: water = 4:3-1:1, v / v), add acetic acid and APTES, after mixing, put in 60 ℃ for pre-polymerization;

[0057] (4) After the pre-polymerization, add TEOS to the pre-polymerization liquid, after half an hour of ultrasonication, add the PAA-modified paper base, and carry out formal polymerization reaction at 60°C;

[0058] (5) ...

Embodiment 3

[0067] When the paper-based test paper can rapidly detect the lead content in tea leaves by ion imprinting color development method:

[0068] First, assemble the test paper for rapid detection of lead in tea by color development of ion imprinted paper: on the back plate of 4.5cm*0.6cm, the front end is pasted with 2.5cm*0.6cm nitrocellulose membrane (as the sample loading channel), and the back end is glued An absorbent pad is attached to provide driving force for sample loading. Finally, paste FP@IIP-Pb in the middle 2+ Paper-based imprinting materials, assembled to obtain a paper-based platform integrating sample loading and adsorption;

[0069]Pretreatment of tea samples: Accurately weigh 2g of pulverized tea samples, fully carbonize them on an electric furnace, ash them in a muffle furnace at 500°C for six hours, take them out and cool them, add 4mL of 10% hydrochloric acid, evaporate to dryness and set The volume was reduced to 5mL to obtain the sample extract. Mix 1 m...

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Abstract

The invention discloses paper-based test paper for rapidly detecting lead in tea by applying ion imprinting coloration, the paper-based test paper comprises a paper base and a lead ion imprinting membrane constructed on the surface of the paper base, the lead ion imprinting membrane is constructed on the surface of the paper base by adopting a sol-gel method, the base material of the lead ion imprinting membrane is natural cellulose, and the base material of the lead ion imprinting membrane is natural cellulose. The natural cellulose is formed by interweaving a plurality of microfibers and nano-level fiber nets; when the paper-based test paper is prepared, a sol-gel method is adopted as a construction mode, a template lead nitrate is effectively fixed and uniformly distributed on the surface of a paper-based material under the multi-layer wrapping and bonding cross-linking effects of nano titanium dioxide, and after template elution is performed, the surface of the constructed material has a large number of lead ion imprinting sites, and in the using process, the lead ion imprinting sites can be used for preparing the paper-based test paper. The lead ions in the tea can be specifically adsorbed, and the constructed detection material is stable in property and free of special color, and does not influence the color development of the lead ions.

Description

technical field [0001] The invention relates to the technical field of paper-based test paper, in particular to a paper-based test paper for rapid detection of lead in tea leaves by ion imprinting and color development. Background technique [0002] The color recognition method has the advantages of fast color development speed, intuitive color development results, simple operation and low production cost. Therefore, there is a large market demand in the fields of food processing, drug analysis, agricultural product safety, environmental monitoring, and clinical medicine. [0003] Important inorganic pollutants such as heavy metal lead in tea are continuously accumulated during the growth of tea, leading to deterioration of the quality of tea products. Polyphenolic compounds in tea tissues have a major influence on the distribution and form of lead. Monitoring the accumulation of lead ion levels in tea products is a key task in the development of organic agriculture. In a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 郇伟伟李洁漏忆雯干雅婷周颖吴小妹陈万勤叶海朋张宜明
Owner ZHEJIANG FORESTRY UNIVERSITY
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