| 摘要 |
A vaccine against Group C meningococcal meningitis consisting of a polysaccharide of which at least 80% by weight has a molecular weight in excess of 1,000,000 daltons is prepared. The polysaccharide was isolated from Group C hexadecyl trimethylammonium bromide cell paste with 1.0M CaCl2 extraction and purified by phenol extraction, ultracentrifugation at 100,000 g. and ethanol fractionation (30%-45% v/v in ethanol). |
