The present invention provides a production method of a medium composition, including previously removing divalent metal cations contained in a polymer compound having an anionic functional group, preparing a dry powder of the polymer compound, and mixing the dry powder and the medium, and the like. The present invention also provides a purification method of a polymer compound having an anionic functional group, which includes mixing a suspension of the polymer compound having an anionic functional group in water and a cation exchanger that exchanges a divalent metal cation with a monovalent metal cation to give a polymer compound having an anionic functional group, which shows a reduced amount of contaminating divalent metal cations.
本发明提供了一种
培养基组合物的生产方法,包括事先除去具有阴离子官能团的聚合物化合物中所含的二价
金属阳离子,制备聚合物化合物的干粉,以及将干粉和
培养基混合等。本发明还提供了一种具有阴离子官能团的聚合物化合物的提纯方法,包括将具有阴离子官能团的聚合物化合物悬浮液与
水和阳离子交换器混合,阳离子交换器将二价
金属阳离子与一价
金属阳离子交换,得到具有阴离子官能团的聚合物化合物,该聚合物化合物中的二价
金属阳离子污染量有所减少。