以双功能褐藻胶裂解酶(Pseudoalteromonas sp. strain No. 272)分别降解均聚古罗糖醛酸(PG)和均聚甘露糖醛酸(PM),经Bio-Gel-P6和POROS-HQ20分离得到2种三糖纯品,经ESI-MS,1H-NMR,13C-NMR,1H-1H COSY,1H-13C HMQC确定其结构为Δ4,5-古罗糖醛酸-α (1→4)-L-古罗糖醛酸-α( 1→4)-L-古罗