Colloidal gold partly modified by polyethylene glycol and preparation method thereof
A polyethylene glycol and colloidal gold technology, applied in the field of analytical chemistry, can solve problems affecting the accuracy of analysis results, colloidal gold agglomeration, false positives, etc., to solve uncontrollable agglomeration and sedimentation, good dispersion performance, and enhanced stability Effect
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[0032] Example 1
[0033] The following is the preparation of poly(ethylene glycol) 2-thioethyl ether acetic acid (Poly(ethylene glycol) 2-thioethyl ether acetic acid, average molecular weight 1000) partially modified colloidal gold with an average particle size of 43 nanometers using the method of the present invention, and application The colloidal gold detects mercury ions (Hg 2+ ) Specific examples of content:
[0034] Firstly, the cover glass (20 mm×20 mm) is immersed in a 10 ml beaker containing a mixture of 98% concentrated sulfuric acid and 30% hydrogen peroxide (volume ratio 4:1) for 5 minutes, and then the beaker is placed in the sonicator Ultrasound in a medium water bath for 15 minutes; then take out the treated coverslip, rinse it three times with secondary water, immerse it in a 0.05 M dodecyltrimethylammonium bromide solution, and let it stand overnight; then the surface The cover glass assembled with dodecyltrimethylammonium bromide was taken out, washed three ti...
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