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Method for rapid determination of sulphur ions with nanogold as logic gate color developing probe

A rapid determination, nano-gold technology, applied in analytical chemistry and nano fields, to achieve the effect of simple and fast preparation process, good anti-interference and fast detection speed

Inactive Publication Date: 2013-10-23
FUJIAN MEDICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the input signals of most of the logic gate systems reported above are (biological) molecules and metal ions, and the reports of anion as the input signal of logic gates are extremely rare.

Method used

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  • Method for rapid determination of sulphur ions with nanogold as logic gate color developing probe
  • Method for rapid determination of sulphur ions with nanogold as logic gate color developing probe
  • Method for rapid determination of sulphur ions with nanogold as logic gate color developing probe

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The preparation of embodiment 1 nanometer gold:

[0038] Dissolve 1 milliliter of 0.1 g / L chloroauric acid solution in 100 milliliters of water, heat and boil under reflux, then quickly add 3 milliliters of 0.1 g / L trisodium citrate solution, the reaction solution turns from light yellow to wine red, and continue to reflux for 15 minutes After that, the reaction solution was slowly cooled to room temperature. The obtained nano-gold particle size is 13 nm, the concentration is about 3.1 nmol / L, and stored at 4 °C.

Embodiment 2

[0040] Add 0.2 ml of a phosphate buffer solution containing 5 μmol / L thiourea to 0.2 ml of the nanogold prepared in Example 1 (the concentration of the phosphate buffer solution is 0.01 mol / L, pH=9), and react at 30°C for 3 minutes . When neither thiourea nor sulfide ions are contained, or only sulfide ions are contained, or both thiourea and sulfide ions are contained, that is, in three states (0, 0), (0, 1), (1, 1), Gold nanoparticles do not settle, the color of the solution remains red (indicating that the output signal is 0), and the absorbance ratio A 680 / A 520 Small; when only thiourea is contained, that is, in the (1, 0) state, gold nanoparticles will settle, and the solution will turn blue (indicating that the output signal is 1), and the absorbance ratio A 680 / A 520 big (see figure 1 ).

Embodiment 3

[0042] Add 0.2 ml of phosphate buffer solution containing 5 μmol / L thiourea to 0.2 ml of the nanogold prepared in Example 1 (the concentration of the phosphate buffer solution is 0.01 mol / L, pH=5~10), and react at 30°C 3 minutes, measure the absorbance ratio A 680 / A 520 . Such as figure 2 As shown, ΔA 680 / A 520 It reaches the maximum when the pH of the system is 9.

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Abstract

The invention discloses a method for rapid determination of sulphur ions with nanogold as a logic gate color developing probe. As thiourea can enable aggregation of a nanogold solution, the solution changes from wine red to blue, and sulphur ions can specifically inhibit thiourea from aggregating nanogold, variation of the solution color and ultraviolet absorption spectrum characteristics can be shown, so that the sulphur ion concentration can be determined. Thiourea can make the nanogold solution undergo aggregation and change the solution color from wine red to blue, while sulphur ions can specifically inhibit thiourea from aggregating nanogold, thus showing variation of the solution color and ultraviolet absorption spectrum characteristics. The limit of detection of visual observation is 4 micromol / L. The linear range of absorbance ratio determination is 2-9 micromol / L. After simple pretreatment, mineral water, tap water, river water, white grape wine, human urine and other actual samples can be subjected to sulphur ion content determination by the method.

Description

technical field [0001] The invention relates to a rapid content determination method of sulfur ions using nano gold as a logic gate chromogenic probe, belonging to the fields of analytical chemistry and nanotechnology. Background technique [0002] Sulfide is a common chemical raw material and chemical pollutant in papermaking, petrochemical, leather and other industries, which is harmful to aquatic ecosystems and human health. Under acidic conditions, sulfide is transformed into hydrogen sulfide, which can harm cytochrome and oxidase, cause hypoxia in cells and tissues, and even endanger life. Hydrogen sulfide also corrodes metal equipment and pipelines, and can be oxidized into sulfuric acid by microorganisms, which intensifies corrosion. At the same time, hydrogen sulfide is known as the third endogenous gas signal molecule after nitric oxide and carbon monoxide, and is a strong antioxidant and vasodilation factor. Numerous studies have shown that hydrogen sulfide level...

Claims

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Application Information

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IPC IPC(8): G01N21/25G01N21/33G01N21/78
Inventor 陈伟邓豪华许雄伟刘爱林林新华李光文
Owner FUJIAN MEDICAL UNIV
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