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Copper ion detection capillary tube with stimuli-responsive wettability, and application thereof

A copper ion detection and capillary technology, applied in the field of analytical chemistry, can solve the problems of complex operation and the need for professionals, and achieve the effects of broad application prospects, easy portability and strong operability

Active Publication Date: 2020-09-29
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods often have the disadvantages of complex operation and the need for professionals. Therefore, it is necessary to develop a rapid, easy-to-operate and portable instant detection method for copper ions

Method used

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  • Copper ion detection capillary tube with stimuli-responsive wettability, and application thereof
  • Copper ion detection capillary tube with stimuli-responsive wettability, and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] A kind of stimulation wet responsive copper ion detection capillary, its preparation method comprises the following steps:

[0019] (1) Cleaning of the glass capillary: place the glass capillary in piranha solution (98vol% H 2 SO 4 and 30vol% H 2 o 2 (mixed at a volume ratio of 7:3) for 2 h, then ultrasonicated with ethanol and water for 5 min each, and then washed with N 2 blow dry;

[0020] (2) Preparation of gold seed solution: the sodium citrate reduction method was used to prepare gold seed solution with a particle size of about 20nm. Specifically, before the synthesis, the glassware to be used was filled with aqua regia (HCl:HNO3=3:1 ) soaked overnight, then rinsed with running tap water for 10 min, then ultrasonically cleaned with ultrapure water, and finally dried with nitrogen; then, 100 mL of 0.01 wt% HAuCl was added to a 250 mL three-neck flask equipped with a magnetic stir bar 4 solution, adjust the rotation speed of the magnetic stirrer to 800 rpm to m...

experiment example 1

[0028] In order to visually reflect the change of wettability of the inner wall of the capillary glass under different copper ion concentrations, the cover glass was used to replace the glass capillary for surface modification to obtain a stimulus wettability-responsive cover glass, and the change of its contact angle was measured. The preparation method of the stimulus-wetting-responsive copper ion detection device is as follows:

[0029] (1) Place the coverslip in piranha solution (98vol% H 2 SO 4 and 30 vol% H 2 o 2 (mixed at a volume ratio of 7:3) for 2 h, then ultrasonicated with ethanol and water for 5 min each, and then washed with N 2 blow dry;

[0030] (2) First use the sodium citrate reduction method to prepare a gold seed solution with a particle size of 13-20 nm, and then use a one-step seed-mediated method to make gold nanoparticles with a particle size of about 120 nm by using mercaptosuccinic acid as a reducing agent. Finally, redisperse the nano-gold parti...

experiment example 2

[0037] A kind of stimulation wet responsive copper ion detection capillary, its preparation method comprises the following steps:

[0038] (1) Cleaning of the glass capillary: place the glass capillary in piranha solution (98 vol% H 2 SO 4 and 30vol% H 2 o 2 (mixed at a volume ratio of 7:3) for 2 h, then ultrasonicated with ethanol and water for 5 min each, and then washed with N 2 blow dry;

[0039] (2) Preparation of nano-gold solution: Firstly, sodium citrate reduction method was used to prepare gold seed solution with a particle size of 13-20 nm, and then a one-step seed-mediated method was used to prepare a gold seed solution with a particle size of about 120 nm using mercaptosuccinic acid as a reducing agent. Nano-gold particles, after centrifugation, re-disperse the nano-gold particles into water, and adjust the pH to 9.0 to form a nano-gold solution;

[0040] (3) Amination treatment on the surface of the glass capillary: Soak the cleaned glass capillary in ethanol...

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Abstract

The invention discloses a copper ion detection capillary tube with stimuli-responsive wettability, and application thereof, wherein a layer of azido-modified nano gold particles is deposited on the surface of a glass capillary tube to obtain the copper ion detection capillary tube with stimuli-responsive wettability. According to the invention, in the presence of copper ions, by using sodium ascorbate as a catalyst, bivalent copper is reduced into monovalent cuprous, and 1-ethynyl 4-(trifluoromethyl)benzene and azido on the inner wall of a capillary tube are subjected to a 1,3-dipole cycloaddition reaction under the catalysis of the cuprous ions to connect the strong hydrophobic group trifluoromethyl benzene to the inner wall, so that the hydrophilicity of the surface of the glass capillary tube is reduced, and the rising height of the liquid level in the capillary tube is also reduced so as to achieve the preliminary detection of the concentration of the copper ions; the grafting amount of the azido groups on the surface of the capillary tube is controlled, so that the quantitative measurement of the concentration of the copper ions is expected to be further realized; and the copper ion detection capillary tube is easy to carry, high in operability and convenient to detect and is expected to be widely applied to food safety analysis.

Description

technical field [0001] The invention belongs to the field of analytical chemistry, and in particular relates to a stimulus-wetting-responsive copper ion detection capillary and its application in rapid detection of copper ions. Background technique [0002] In nature, many biomaterials exhibit excellent stimuli-responsive surface wettability. External stimuli (e.g., DNA, counterions, temperature, solvents, electric potential, pH, etc.) can alter the surface conformation and / or morphology of stimulus-sensitive materials, leading to changes in surface wetting behavior. Stimuli-responsive materials that functionally have wettability similar to natural surfaces have been developed for bioseparation, drug delivery systems, cell-based diagnostics, biosensing, etc. Capillarity is a common physical and chemical phenomenon related to wettability in nature, that is, the ability of liquid to flow in a narrow space without external force. The capillary force will change with the change...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/10
CPCG01N31/10
Inventor 罗芳陈舒婷林振宇郭隆华邱彬
Owner FUZHOU UNIV