Method for preparing fluorescent carbon quantum dots from alternanthera philoxeroides and detecting lemon yellow

Abstract

The invention discloses preparing fluorescent carbon quantum dots from alternanthera philoxeroides and the use thereof for detecting a food additive lemon yellow. The method comprises the following steps: a, weighing alternanthera philoxeroides powder and thiourea in a mass ratio of 1: 1, adding water, carrying out stirring, and carrying out transferring to a reaction kettle; b, putting the materials into a drying oven, and performing reacting at a set temperature; c, after the reaction is finished, naturally cooling to room temperature, carrying out suction filtration to obtain a carbon quantum dot solution, carrying out dialyzing, carrying out rotary evaporation, and carrying out drying to obtain carbon quantum dot powder. The prepared fluorescent carbon quantum dot for detecting lemon yellow belongs to a turn off type, and has the advantages of high sensitivity, strong stability, good selectivity, low cost and the like. The optimal concentration range of linear detection is 7.8-125 [mu]mol/L, the detection limit is 0.45 [mu]mol/L which is far lower than the detection limit 187.14 [mu]mol/L provided by the national standard GB/T 5009.35-2003, and the method can be used as a convenient and accurate lemon yellow rapid detection method.

Description

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AI Technical Summary

Benefits of technology

The inventors found that certain types of nanoparticles called CQDSs were able to attach themselves onto other molecules like amphetamines or drugs they had previously taken up into them during their manufacture (which could lead to drug abuse). This makes it possible to use these particles with great potential applications such as identifying illegal narcosis-related substances from blood samples.

Problems solved by technology

This patents describes different ways to detect or measure certain chemical compounds called tetrahydrastannins ("THP"), particularly those that contain sulfur atoms. These techniques can be applied either alone or combined together depending upon factors like wavelength, absorbance, concentration threshold limits, and other requirements. Current analysis tools require complicated operations, long hours, specialized training, and complex data collection procedures. There is thus a technical problem addressed in this patented paper relating to developing fast and effective means for identifying tantazines containing these ingestible colors without requiring extensive laboratory testing.

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