Table 2.

HBsAg stability at 4°C storage of concentrated partially purified HBsAg

Cell line	Day after concentrated
	1	18	27
HB117
ELISA, ng/μl	5.8	4.8	4.5
Auszyme, ng/μl	0.7	2.2	2.5
% “a” epitope	12	45	55
HB118
ELISA, ng/μl	2.1	2.1	ND
Auszyme, ng/μl	1.1	1.1	ND
% “a” epitope	53	53	ND

HBsAg was measure by either polyclonal ELISA or Auszyme monoclonal assay; % “a” epitope is calculated as in Table 1. ND, not determined.