The invention relates to the technical field of chemical analysis and detection, in particular to a
fluorescence determination method for
free amino acid in tobacco leaves, based on the
fluorescence characteristic of
epinephrine-based
zinc-
doped carbon dots Zn / NA-CDs,
free amino acid reacts with phthalic dicarboxaldehyde to generate a
Schiff base product, and Zn / NA-CDs and
Schiff base have
hydrogen bond interaction and charge transfer effect, so that the content of
free amino acid in tobacco leaves is determined. Therefore, the
Schiff base has a
fluorescence sensitization effect on the Zn / NA-CDs, and a free
amino acid fluorescence detection method is established. According to the method, the
detection limit can reach 0.01 mg / L, and the
recovery rate is between 90.52% and 105.33%, so that the method also has high sensitivity to low-concentration free
amino acid, can meet the requirement for accurately measuring trace
amino acid in tobacco leaves, and has excellent accuracy and reliability. Meanwhile, the method further has the advantages of being easy and convenient to operate, low in cost,
environmentally friendly, wide in applicability and the like, a new technical means is provided for
tobacco leaf quality detection, and beneficial reference is provided for amino acid determination in other fields.