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Whale heparin was separated by affinity chromatography on an antithrombin III-Sepharose column into two distinct fractions. The high-affinity fraction accounted for most the anticoagulant activity of the unfractionated material, while the low-affinity fraction was relatively inactive. The yields of the two fractions were substantially equivalent. No significant difference was observed between these fractions in terms of electrophoretic mobilities on cellulose acetate membrane and analytical data except for the contents of N-acetylglucosamine and N-sulfoglucosamine. The highly active form contained more N-acetylglucosamine and less N-sulfoglucosamine than the relatively inactive form. The two fractions were separately subjected to the sequential digestion with purified heparinase and heparitinase, and the oligosaccharide fractions were isolated from the digests by DEAE-cellulose column chromatography, followed by preparative paper chromatography. The purified compounds were then characterized by routine chemical and physical methods. Compound 1, delta 4,5hexosyuronic acid1 leads to 4N-acetylglucosamine, was exclusively obtained from the highly active form, whereas compound 3a, delta 4,5hexosyluronic acid1 leads to 4N-acetylglucosamine 6-sulfate, and compound 3b delta 4,5hexosyluronic acid1 leads to 4-sulfoglucosamine, were the only ones obtained from the relatively inactive form. The yields of other oligosaccharide fractions from both forms were comparable. The present data suggest that an N-acetylglucosamine-containing oligosaccharide structure in whale heparin is essential for binding to antithrombin II.

High performance liquid chromatography was performed by an ion-pair reversed-phase method of six standard unsaturated disaccharides derived from heparan sulfate and heparin. Separation of delta Di-GlcNAc, delta Di-GlcN(2S), delta Di-GlcNAc(6S), delta Di-GlcN(2,6- or 2,2'-diS) and delta Di-GlcN(2,6,2'-triS) was achieved on a column of Jasco SC-02 with 10 mM tetrabutylammonium phosphate (pH 7.0) containing 30 or 47% methanol as a mobile phase. delta Di-GlcN(2,6-diS) and delta Di-GlcN(2,2'-diS) were separated on the same column with 35 mM triethylamine phosphate (pH 5.3). Four preparations (BL-1.0-1, BL-1.0-2, BL-1.0-3, and BL-1.25-1) separated from crude bovine lung heparan sulfate, a standard bovine lung heparan sulfate (BL-ST), bovine kidney heparan sulfate 1.0 M Fr and 1.25 M Fr (BK-1.0 and BK-1.25), and porcine kidney heparan sulfate 1.0 M Fr (PK-1.0) were digested with a mixture of heparinase, and heparitinases 1 and 2. The resulting foregoing unsaturated disaccharides in the digests were analyzed by the above HPLC procedures. The proportions of the unsaturated disaccharides in the digests of BL-1.25-1 and BL-ST were similar, but those of the others differed from each other. It is noteworthy that delta Di-GlcNAc plus delta Di-GlcNAc(6S) in the digest of BL-1.0-1 was approximately 95% of the total unsaturated disaccharides. Small amounts of delta Di-GlcN (2,6,2'-triS) were found in all the samples. It was found that delta Di-GlcN(2,2'-diS) was a prominent component in the disulfated unsaturated disaccharides from BL-1.25-1 and BK-1.25.

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