Table 1.

Concentration (mg/mL) of anti-SA in different formulation before and after filtration ^*

Formulation	Concn. Unfiltered (mg/mL)	Concn. In Aqueous Filtrate (mg/mL)	Difference in Concn. pre and post filtration (mg/mL)**
A5	1.02 ± 0.04	1.02 ± 0.04	0.01 ± 0.01
A5NaCL	1.00 ± 0.01	0.94 ± 0.03	0.06 ± 0.02
Phosphate	0.99 ± 0.02	0.95 ± 0.05	0.04 ± 0.02
PBS	1.02 ± 0.01	0.98 ± 0.03	0.04 ± 0.02
A5 polysorbate20	0.99 ± 0.02	0.98 ± 0.01	0.01± 0.01
A5 sucrose	1.04 ± 0.03	0.99 ± 0.04	0.03 ± 0.01

^*The mean ± SD was calculated from triplicate set of samples each replicate prepared using different syringes and filter.

^**The mean ± SD was calculated from differences in concentration measured for each replicate for a given solution.