Preparation of carbon dots from Folium nelumbinis and their application in the detection of food carmine
[Objective]To establish a fast,sensitive,and accurate method for detecting carmine.[Methods]Using Folium Nelumbinis;as the carbon source,carbon dots(FN-CDs)were prepared using a solvent thermal method,and the preparation conditions were optimized using a single factor test.Study the factors that affect the fluorescence intensity of FN-CDs,the effects of coexisting substances on the detection system,and optimize the measurement conditions;Using FN-CDs for the determination of carmine content in food and exploring its mechanism of action.[Results]Using 0.6 g of Folium Nelumbinis,0.25 g of citric acid and 45 mL of formamide were reacted at 240℃for 4 hours,and the fluorescence value of FN-CDs was the strongest.Rouge had a good linear relationship within the concentration range of 0～70 µg/mL,with an R2 of 0.996 4 and a detection limit of 0.57 µg/mL.The spiked recovery rates of grapefruit juice beverage and canned arbutu were 88.09%～102.49%and 97.73%～112.47%,respectively.[Conclusion]This detection method has the characteristics of high sensitivity,good selectivity and high accuracy,and can be applied to the rapid detection of carmine in food.
国家科技期刊平台
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