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Quick measuring method for copper ions by heat-treated bare nano-gold as developing probe

A rapid determination and nano-gold technology, which is applied in the field of analytical chemistry and nanometers, can solve the problems of complex detection steps and low sensitivity, and achieve the effects of high detection sensitivity, fast detection speed, and simple and fast heat treatment process

Inactive Publication Date: 2013-01-16
FUJIAN MEDICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the complex modification process of gold nanoparticles, relatively complicated detection steps, time-consuming process, and low sensitivity limit the application of these methods.

Method used

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  • Quick measuring method for copper ions by heat-treated bare nano-gold as developing probe
  • Quick measuring method for copper ions by heat-treated bare nano-gold as developing probe
  • Quick measuring method for copper ions by heat-treated bare nano-gold as developing probe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation of heat-treated bare gold nanoparticles: First, 500 μL of 0.1 g / L chloroauric acid aqueous solution was diluted with 39.5 ml of water, and 0.8 ml of 0.1 g / L sodium borohydride aqueous solution was added under vigorous stirring (the addition time was controlled Within 5 minutes), the color of the reaction solution changed from light yellow to wine red, and continued rapid stirring for 1 hour in the dark to obtain bare gold nanoparticles. The obtained bare gold nanometer solution was heated in a constant temperature water bath at 70° C. for 5 minutes to obtain heat-treated bare gold nanometer. The heat-treated bare gold nanometer solution is wine red, with a maximum absorption wavelength of 515 nm (see figure 1 ). All glassware used in the above process was soaked in aqua regia, washed thoroughly with double distilled water, and dried.

Embodiment 2

[0037] Copper ions interact with heat-treated bare gold nanoparticles: 0.2 milliliters of phosphate buffer solution containing 6 μmol / L copper ions was added to 0.2 milliliters of the heat-treated bare gold nanoparticles prepared in Example 1 (the concentration of the phosphate buffer solution is 0.01 mol / L , pH=8), react at 70°C for 5 minutes. The color of bare gold nanoparticles changes from wine red to blue, and the maximum absorption wavelength is red-shifted (see figure 2 ).

Embodiment 3

[0039] Copper ions interact with heat-treated bare gold nanoparticles: 0.2 milliliters of phosphate buffer solution containing 2.5 μmol / L copper ions was added to 0.2 milliliters of the heat-treated bare nano-gold prepared in Example 1 (the concentration of the phosphate buffer solution is 0.01 mol / L , pH=6-12), react at 70°C for 5 minutes, and measure the absorbance ratio A 650 / A 515 . Such as image 3 As shown, the absorbance ratio A 650 / A 515 It reaches a maximum at pH=8.

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Abstract

The invention discloses a quick measuring method for content of copper ions by heat-treated bare nano-gold as a developing probe. Surface effect of the heat-treated bare nano-gold with the copper ions causes gathering of nano-gold, and accordingly changes in characteristics of the color of solution and the ultraviolet absorption spectrum are shown. The characteristics of the color of the heat-treated bare nano-gold solution are observed visually to judge the concentration of the copper ions, and detection limit of visual observation is 2 micrometers mol / L. The concentration of the copper ions is judged according to the ratio of light absorbance of the heat-treated bare nano-gold A650 / A515. A linear range of measuring the ratio of the light absorbance is 0.5-6micrometers mol / L, and the detection limit is 0.04micrometers mol / L.

Description

technical field [0001] The invention relates to a method for quickly measuring copper ion content by using heat-treated bare nano-gold as a color probe, and belongs to the fields of analytical chemistry and nanotechnology. Background technique [0002] Gold nanoparticles have attracted extensive attention due to their facile preparation and biofunctionalization, excellent biological stability, and unique spectral properties. The surface plasmon absorption bands of gold nanoparticles lie in the visible region of the electromagnetic spectrum and are influenced by the morphology of the nanoaggregates. Typical colloidal gold nanoparticles are wine red, while their aggregates appear purple or blue, which is due to the shift of the surface plasmon absorption band of gold nanoparticles to long wavelengths. Methods based on this principle can be used for the detection of various analytes such as cells, proteins, DNA, and metal ions. [0003] As an essential trace element for livin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33
Inventor 陈伟邓豪华刘爱林林新华李光文
Owner FUJIAN MEDICAL UNIV
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