Preparation and characterization of 7-ethyl-10-hydroxycamptothecin-loaded hypomicron of amphiphilic block copolymer / 药学学报
Acta Pharmaceutica Sinica
;
(12): 440-444, 2007.
Article
in Chinese
| WPRIM
| ID: wpr-281877
ABSTRACT
Methoxypolyethylene glycol-poly lactic acid (PELA) was synthesized by ring-opening copolymerization of lactide in the presence of mPEG and its structure was characterized by 1H NMR. The novel hypomicrons were prepared by solution-casting method using PELA block copolymer as a matrix and 7-ethyl-10-hydroxycamptothecin (SN-38) as an antitumor agent. The morphology, size and size distribution, drug loading, entrapment efficiency, and release characteristics in vitro of the SN-38 loaded hypomicrons were studied. The results showed that the obtained hypomicrons showed spherical shape with the core-shell structure, the sizes are in the range of 157-238 nm, and the drug loading content varied from 1.35%-3.58% depending on the copolymer composition and the SN-38 fed amount. The in vitro release behavior in phosphate-buffered saline, pH 7.4, exhibited a sustaining release manner and was affected by the copolymer composition. The drug-loaded amount and entrapment efficiency decreased with increasing the molecular weight of the copolymer. With the increasing of the SN-38 fed amount, the drug-loaded amount and the size of hypomicrons increased, the entrapment efficiency decreased. The SN-38 hypomicrons increased the solubility of SN-38 in water and were valuable for the development of the novel dosage form of SN-38.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Particle Size
/
Polyesters
/
Polyethylene Glycols
/
Polymers
/
Solubility
/
Camptothecin
/
Drug Carriers
/
Chemistry
/
Technology, Pharmaceutical
/
Lactic Acid
Language:
Chinese
Journal:
Acta Pharmaceutica Sinica
Year:
2007
Type:
Article
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