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. 2023 Nov 27;15(1):355–365. doi: 10.1039/d3md00473b

Impact of Gln, Glu, Lys and Arg on calculated pI.

Modification Calculated pI Change in pI relative to parental antibody
Anti TNF 8.72
Anti TNF + 4 Gln 8.72 0
Anti TNF + 10 Gln 8.72 0
Anti TNF + 4 Glu 7.96 −0.8
Anti TNF + 10 Glu 7.12 −1.6
Anti TNF + 4 Lys 9.10 0.4
Anti TNF + 10 Lys 9.40 0.7
Anti TNF + 4 Arg 9.12 0.4
Anti TNF + 10 Arg 9.42 0.7