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. 2018 May 8;23(5):1112. doi: 10.3390/molecules23051112

Table 1.

Some chemical properties of the studied biogenic amines (BAs) [13,17].

BA Structure pK Value
Putrescine (PUT) graphic file with name molecules-23-01112-i001.jpg pK1 = 10.8; pK2 = 9.4
Cadaverine (CAD) graphic file with name molecules-23-01112-i002.jpg pK1 = 11.0; pK2 = 9.9
Spermidine (SPD) graphic file with name molecules-23-01112-i003.jpg pK1 = 9.5; pK2 = 10.8; pK3 = 11.6
Spermine (SPM) graphic file with name molecules-23-01112-i004.jpg pK1 = 11.50; pK2 = 10.95; pK3 = 9.79; pK4 = 8.90
Histamine (HIS) graphic file with name molecules-23-01112-i005.jpg pK1 = 9.8; pK2 = 6.0
Tryptamine (TRY) graphic file with name molecules-23-01112-i006.jpg pK = 10.2
Tyramine (TYR) graphic file with name molecules-23-01112-i007.jpg pK = 9.6
Phenylethylamine (PEA) graphic file with name molecules-23-01112-i008.jpg pK = 10.0