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Iodide ion quantitative instant detection technology

A detection technology, iodine ion technology, applied in the field of iodine ion quantitative real-time detection, can solve the problems of unsuitable real-time detection, lack of portability, high price, etc., and achieve low-cost portable qualitative and quantitative detection, specific portable qualitative and quantitative detection, The effect of reducing the cost of analysis

Inactive Publication Date: 2019-07-12
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the limited sensitivity of the naked eye to observe the color change of its solution when the gold nanomaterials are agglomerated, the detection limit of the target object based on this type of probe is often limited to the micromolar level.
In addition, most of the existing nano-gold optical sensing methods require quantitative detection with professional analytical instruments such as UV-Vis spectrophotometers, which are expensive and lack portability, and the analysis cost is high, and they are not suitable for on-site analysis and instant inspection (Point -of-Care Testing) application

Method used

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  • Iodide ion quantitative instant detection technology
  • Iodide ion quantitative instant detection technology
  • Iodide ion quantitative instant detection technology

Examples

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Embodiment 1

[0022] 100 nM iodide ions and a blank sample (blank, ultrapure water with a resistivity of 18.2 MΩ·cm) were detected using the iodide ion quantitative instant detection technology of the present invention.

[0023] Such as figure 1 As shown, the specific steps of this example are as follows: step 1, mix 900 μL of NaI aqueous solution (100 nM) and 100 μL of gold nanoparticles diluted 1000 times with ultrapure water (resistivity 18.2 MΩ·cm) in a 1.5 mL transparent test tube Particle solution (particle size is about 20 nm, the original solution is obtained by reducing chloroauric acid with sodium citrate), iodide ion (I - ) will etch part of the nano-gold particles into gold ions; step 2, use the red laser beam generated by the laser pointer to irradiate the mixture solution to make it produce Tyndall effect optical signals, and use the mobile phone to take pictures and record the gray value of the signal (Grayscale ). In addition, according to the same procedure, the method wa...

Embodiment 2

[0025] The iodide ion sample with a concentration range of 0.9-1000 nM is detected by using the iodide ion quantitative instant detection technology of the present invention.

[0026] Such as figure 1 As shown, the specific steps for the analysis of each iodide ion sample in this embodiment are: Step 1, mix 900 μL of NaI aqueous solution containing a certain concentration and 100 μL of ultrapure water (resistivity 18.2 MΩ) in a 1.5 mL transparent test tube cm) diluted 1000-fold gold nanoparticle solution (particle size is about 20 nm, the original solution is obtained by reducing chloroauric acid with sodium citrate), and iodide ions will etch part of the gold nanoparticle into gold ions; step 2, use a laser pointer The generated red laser beam irradiates the mixture solution to generate a Tyndall effect optical signal, and the grayscale value (Grayscale) of the signal is recorded by taking pictures with a mobile phone. The Log value (LogC I- ) plotting ( image 3 ), that i...

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Abstract

The invention discloses an iodide ion quantitative real-time detection technology. The technology mainly comprises the following steps: mixing a solution containing iodide ions with a nanogold solution for reaction; and observing a Tyndall effect optical signal of the mixed solution under a laser beam generated by a laser pen or a laser, wherein the signal intensity is in inverse correlation withthe iodide ion concentration. By using cheap portable photographing equipment to read a signal (a Tyndall effect optical signal), low-cost portable quantitative real-time detection of iodide ions or an analyte related to iodide ion concentration (namely iodide ions generated in a solution or substances for reducing the iodide ion concentration can be realized through a specific recognition reaction) can be realized. The technology disclosed by the invention has the outstanding advantages of simplicity in operation, low cost, no need of professional analysis instruments, suitability for on-siteanalysis and real-time detection and the like. The method can be directly popularized and applied to qualitative and quantitative detection of various samples in the fields of medical diagnosis, environment monitoring, food safety and the like.

Description

technical field [0001] The invention belongs to the technical field of chemical sensing, and in particular relates to a quantitative instant detection technology of iodide ions. Background technique [0002] The liquid-comparative colorimetric analysis method using nano-gold materials such as gold nanoparticles, gold nano-rods, and gold-nano-clusters as colorimetric probes has the advantages of simple operation, low cost, and the analyte-mediated agglomeration of gold nano-materials makes the color of the solution visible to the naked eye. It has been favored by analysts for a long time and has been widely used in medical testing, environmental analysis, food safety and other fields. However, due to the limited sensitivity of the naked eye to observe the color change of the solution when the gold nanomaterials are agglomerated, the lower limit of detection of the target object based on the optical qualitative analysis or semi-quantitative analysis of this type of probe is of...

Claims

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Application Information

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IPC IPC(8): G01N21/63
CPCG01N21/63
Inventor 张云刘召应聂瑾芳陈意静
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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