Table 2.

Charge heterogeneity distribution consistency of the control standards and supernatant samples determined by the described CEX method using the pH 7 buffer system

Sample	Variant	Relative area ± σ (%)
Pharmaceutical standard (n = 15)	Acidic	16.2 ± 1.3
	Main	59.2 ± 1.6
	Basic	24.5 ± 0.8
Fed-batch samples drawn at day 4 (n = 8)	Acidic	69.2 ± 3.0
	Main	24.6 ± 2.5
	Basic	6.6 ± 1.7