| abstract |
A new type polyethylene glycol lipid and the use thereof. The lipid is free of in-vivo cleavable bonds, and can deliver a bioactive substance to a target cell or organ more stably. In addition, the new type polyethylene glycol lipid can be positively charged in a specific pH environment, and can more easily form stable particles with the bioactive substance, so that the bioactive substance plays a role in the target cell or organ. |