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Polyamines (PAs) are a class of low-molecular-weight aliphatic nitrogenous bases that widely exist in plants, animals and microorganisms, including putrescine, spermidine, spermine and their derivatives. Polyamines are related to cell growth and development, nucleic acid metabolism, protein biosynthesis, sugar, lipid, hormone metabolism, etc., and play an important role in the growth and development of organisms. Therefore, the detection of polyamines has important research significance in the study of plant growth and development and clinical diagnosis.