Chemical structure analysis by GLC and MS showed that Hf2 is a polygalacturonan,in which about 1/3 of the main chain is composed of (1→4)-linked GalA,and 2/3 is composed of (1→2)-linked GalA and Rha.
山楂果胶中的酸性糖组分Hf2是一种多聚半乳糖醛酸多糖(polygalacturonan),其30%可被果胶裂解酶所分解。