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. 2021 Dec 16;10(12):2006. doi: 10.3390/antiox10122006

Table 1.

Experimental pKa values (with their references) and the molar fractions (Mf) for the different acid-base species of the investigated PhAs, at pH = 7.4.

PhAs pKa1 pKa2 pKa3 pKa4 Mf
(HnA)		 Mf
(Hn−1A−)		 Mf
(Hn−2A−2)		 Mf
(Hn−3A−3)		 Mf
(Hn−4A−4)		 Refs.
COA 4.38 8.68 0.001 0.949 0.050 [56,72,73]
FLA 4.56 8.65 0.001 0.945 0.053 [56,73]
PRA 4.38 8.74 10.67 0.001 0.955 0.044 <0.001 [56,57]
GAA 4.32 8.24 9.97 13.1 0.001 0.871 0.127 <0.001 <0.001 [58,74]