Amphipathic polymer modified AuNPs (Au nanoparticles) organic mercury colorimetric detection method

An amphiphilic polymer, organic mercury technology, applied in the field of analytical chemistry science, can solve problems such as poor selectivity and inability to detect organic mercury, and achieve the effect of high detection specificity

Active Publication Date: 2019-04-05
LUDONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a colorimetric sensor capable of quickly and efficiently detecting organic mercury, so as to solve the problems that ex

Method used

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  • Amphipathic polymer modified AuNPs (Au nanoparticles) organic mercury colorimetric detection method

Examples

Experimental program
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Example Embodiment

[0027] Example 1 Preparation of HPEI-D1-C16 / AuNPs

[0028] Weigh 30 mg of amphiphilic hyperbranched polymer HPEI-D1-C16 and dissolve it in 6 mL of chloroform, mix with 6 mL of chloroauric acid aqueous solution and shake, after the system is stratified, remove the lower organic phase liquid and add 0.5 g The magnesium sulfate was dried, then centrifuged, and reacted at 45 ℃ for 3 hours to prepare the amphiphilic hyperbranched polymer HPEI-D1-C16 stably modified AuNPs colorimetric probe.

Example Embodiment

[0029] Example 2 The detection sensitivity of HPEI-D1-C16 / AuNPs to organic mercury

[0030] In the present invention, the amphiphilic hyperbranched polymer stabilized AuNPs are used as colorimetric probes to detect the presence of organic mercury. In the detection process, when organic mercury is present, it can be observed by the naked eye that the system will change from the original red to yellow, and the characteristic absorption peak of the ultraviolet absorption spectrum has a red shift, thus realizing the colorimetric detection of organic mercury.

[0031] Take 4.0 mL of the chloroform solution of HPEI-D1-C16 / AuNPs, add 0.5 mL of ethyl mercury chloride solution of different concentrations and 3.5 mL of water, shake for 2-5 min, remove the lower organic phase liquid, and add 1.0 mL 1.0 ×10 -3 M sodium borohydride / methanol solution, finally dilute to 6 mL with methanol, and after standing still for 2 minutes, take a picture and test its ultraviolet-visible absorption spectrum...

Example Embodiment

[0033] Example 3 Investigation on the selective detection of organic mercury by HPEI-D1-C16 / AuNPs

[0034] In the experiment of using amphiphilic hyperbranched polymer stabilized AuNPs as a colorimetric probe to detect ethyl mercury chloride, a variety of metal ions (Hg 2+ , Ag + , Mg 2+ , Ba 2+ , Sr 2+ , Pb 2+ , Mn 2+ , Zn 2+ , Cs + , Ni 2+ , Cu 2+ , K + ) As an interference ion to investigate the detection selectivity of the colorimetric probe. Take 4.0 mL HPEI-D1-C16 / AuNPs trichloromethane solution (13 parts), add 0.5 mL respectively to a concentration of 1.0×10 -5 The concentration of M ethylmercury chloride and 0.5 mL is 1.0×10 -4 Hg of M 2+ , Ag + , Mg 2+ , Ba 2+ , Sr 2+ , Pb 2+ , Mn 2+ , Zn 2+ , Cs + , Ni 2+ , Cu 2+ , K + After shaking the solution for 3 min, remove the lower organic phase liquid and add 1.0 mL 1.0×10 -3 M sodium borohydride / methanol solution, finally dilute the volume to 6 mL with methanol, after standing for 2 minutes, take a picture and test its UV-visib...

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Abstract

The invention discloses a preparation method of amphipathic polymer modified AuNPs and application of the amphipathic polymer modified AuNPs to organic mercury detection. According to the preparationmethod of the amphipathic polymer modified AuNPs, oleophilic fatty acyl chloride is applied to modifying hyperbranched polyethyleneimine (HPEI) to prepare an amphipathic hyperbranched polymer with a core-shell structure; the amphipathic hyperbranched polymer can be based on acid-alkali interaction to transfer chloroauric acid in aqueous phase into organic phase, and by means of the reducing capability of amido of the HPEI, can achieve in situ reduction to prepare high-stability AuNPs. The amphipathic polymer modified AuNPs can interact with organic mercury to form Au-Hg alloy to result in change of a system in color and ultraviolet-visible absorption spectrum and further to achieve high-selectivity detection of the organic mercury with a minimum detection limit as low as 1*10<-6> M. The amphipathic polymer modified AuNPs can gather the organic mercury through phase transfer, thereby, when applied to systems such as discrete-distribution and low-concentration seawater and soil, being high in sensitivity and selectivity of organic mercury detection.

Description

technical field [0001] The invention belongs to the field of analytical chemistry science, and relates to a preparation method of an amphiphilic hyperbranched polymer / gold nanoparticle composite probe applied to the detection of organic mercury. Background technique [0002] Mercury is a non-essential element widely present in nature. With the development of industry, nearly 5,000 tons of mercury in different forms are discharged around the world every year, which is extremely harmful to the environment and human health. Various forms of mercury and its compounds will cause multi-system damage to the body, mainly including neurotoxicity and renal toxicity. Among them, organic mercury has lipophilicity, bioaccumulation effect and biomagnification effect, and its toxicity is often hundreds of times that of inorganic mercury. Therefore, rapid detection of mercury ions is of great significance, which can effectively prevent and control or avoid its harm to the environment and ...

Claims

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Application Information

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IPC IPC(8): C09K11/58C09K11/02B82Y20/00B82Y30/00B82Y40/00G01N21/78G01N21/31
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/025C09K11/58G01N21/31G01N21/78
Inventor 刘训恿边杰刘毅朱晨雪戴雨晴刘军深郭磊
Owner LUDONG UNIVERSITY
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