An object of the present invention is to provide an agent for promoting undifferentiation that dissolves a drug, as DMSO or the like does, but is capable of promoting undifferentiation without inducing cell differentiation when added to a medium. The agent for promoting undifferentiation of the present invention has an aprotic zwitterion represented by the following formula (1)
wherein A is an anion selected from the group consisting of SO
3
−
, —COO
−
, —OP═O(H)O
−
, —OP═O(CH
3
)O
−
and —OP═O(OR
3
)O
−
, R
1
is an alkyl group having 1 to 8 carbon atoms and optionally containing one or two oxygen atoms in the molecular chain, R
2
is an alkylene group having 3 to 5 carbon atoms, and R
3
is hydrogen or an alkyl group optionally having a heteroatom in the molecular chain.
本发明的目的是提供一种促进未分化的药剂,类似于
DMSO等溶解药物,但在添加到
培养基中时能够促进未分化而不诱导细胞分化。本发明的促进未分化剂具有下式(1)所表示的无极性离子,其中A是从SO3−,—COO−,—OP═O(H)O−,—OP═O(
CH3)O−和—OP═O(OR3)O−组成的阴离子,R1是具有1至8个碳原子并且在分子链中可选地含有一或两个氧原子的烷基基团,R2是具有3至5个碳原子的亚烷基基团,R3是氢或在分子链中可选地具有杂原子的烷基基团。