ethanol precipitation造句怎么写

2、The extracting conditions of pectin from akebia trifoliate koiaz peels with the ways of ethanol precipitation or FeCl3 solutions were studied.

1、The crude polysaccharides from Enteromorpha linea were extracted by hot water and refined by ethanol precipitation method.

3、After ethanol precipitation, OPC was separated by ethyl acetate-ligroin system. Content of OPC was determined by normal butyl alcohol-hydrochloric acid method at 546 nm to be over 90%.