Table 1.

Isoelectric point by cIEF.

Brand	Batch	Main isoform (pI units)	Most acidic isoform (pI units)	Most basic isoform (pI units)	Global pI (pI units)
Herceptin	N35893	8.68 ± 0.01	7.93 ± 0.13	8.94 ± 0.03	8.60 ± 0.00
	B3423B020	8.70 ± 0.01	8.04 ± 0.10	9.00 ± 0.06	8.62 ± 0.01
	B3417B010	8.72 ± 0.01	8.04 ± 0.12	8.86 ± 0.03	8.62 ± 0.01
Trastuzumab-Probiomed	TZPP12002	8.69 ± 0.01	7.97 ± 0.11	8.97 ± 0.12	8.60 ± 0.01
	TZPP12003	8.69 ± 0.00	7.95 ± 0.08	8.84 ± 0.00	8.59 ± 0.01
	TZPP14001	8.69 ± 0.02	8.05 ± 0.14	8.99 ± 0.16	8.60 ± 0.03

Variation is presented as confidence interval at 95% (n = 3).