As a negatively charged lipid that can stably add negative charges to the surface of vesicles without side effects, the carboxyl acid-type lipid of the following general formula [1]
1
[wherein R
1
, R
2
and R
3
represent substituents of which one is represented by the following general formula [X]:
2
(wherein M is a hydrogen atom or monovalent cation, and m is an integer of 1 to 5 that represents the methylene chain length), and the other two are chained hydrocarbon groups; A
1
, A
2
and A
3
are the same or different substituents selected from the group consisting of C(O)O, CONH or NHCO; and n is an integer of 1 to 3 that represents the methylene chain length) is provided.
作为一种可在囊泡表面稳定添加负电荷且无副作用的负电荷脂质,以下通式的
羧酸型脂质[1]
1
其中 R
1
, R
2
和 R
3
代表其中一个由以下通式表示的取代基[X]:
2
(其中 M 为氢原子或一价阳离子,m 为 1 至 5 的整数,代表亚甲基链长 度),另外两个为链状烃基; A
1
, A
2
和 A
3
是相同或不同的取代基,选自由 C(O)O、CONH 或 NHCO 组成的组,n 是 1 至 3 的整数,表示亚甲基链长 度)。