Method for fast detecting nitrite in food through fluorescent/colorimetric double probes
A nitrite and dual-probe technology, which is applied in fluorescence/phosphorescence, measuring devices, and material analysis through optical means, can solve problems such as unfavorable food on-site detection, matrix interference analyte concentration, etc., to achieve convenient promotion and use, The effect of small background interference and wide detection range
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[0031] (1) Preparation of gold nanorods by seed crystal method
[0032] Preparation of gold nano seed solution: at room temperature (25-28°C), prepare 9.75ml 0.1mol / L cetyl ammonium bromide aqueous solution, stir evenly until transparent, add dropwise 0.25ml 0.01mol / L tetrachloroauric acid aqueous solution , after it is uniformly dispersed in the solution, quickly add freshly prepared 0.01mol / L NaBH at 0°C 4 The solution was 0.6ml, the solution changed from light yellow to brownish yellow, stirred evenly for 3min, and stood at room temperature for 2h before use. At this time, the gold concentration was 0.25 mmol.
[0033] Preparation of gold nanorod solution: at room temperature, prepare 10ml of 0.1mol / L cetyltrimethylammonium bromide aqueous solution, then add 0.5ml of 0.01mol / L tetrachloroauric acid aqueous solution, mix well and then add 0.1ml 0.01mol / LAgNO 3 , 0.2ml 1M HCl, stir well, add 80μL 0.1mol / L ascorbic acid, the solution turns from dark yellow to colorless, add...
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