title: Preparation of insulin loaded PLGA-Hp55 nanoparticles for oral delivery.
abstract: The aim of the present work was to investigate the preparation of PLGA nanoparticles (PNP) and PLGA-Hp55 nanoparticles (PHNP) as potential drug carriers for oral insulin delivery. The nanoparticles were prepared by a modified emulsion solvent diffusion method in water, and their physicochemical characteristics, drug release in vitro and hypoglycemic effects in diabetic rats were evaluated. The particle sizes of the PNP and PHNP were 150+/-17 and 169+/-16 nm, respectively, and the drug recoveries of the nanoparticles were 50.30+/-3.1 and 65.41+/-2.3%, respectively. The initial release of insulin from the nanoparticles in simulated gastric fluid over 1 h was 50.46+/-6.31 and 19.77+/-3.15%, respectively. The relative bioavailability of PNP and PHNP compared with subcutaneous (s.c.) injection (1 IU/kg) in diabetic rats was 3.68+/-0.29 and 6.27+/-0.42%, respectively. The results show that the use of insulin-loaded PHNP is an effective method of reducing serum glucose levels.
authors.affiliation: School of Pharmacy, Shenyang Pharmaceutical University, No. 103, Wenhua Road, Shenyang 110016, China. cuifude@163.com
authors.forename: Fu-de
authors.initials: FD
authors.lastname: Cui
authors.forename: An-jin
authors.initials: AJ
authors.lastname: Tao
authors.forename: Dong-mei
authors.initials: DM
authors.lastname: Cun
authors.forename: Li-qiang
authors.initials: LQ
authors.lastname: Zhang
authors.forename: Kai
authors.initials: K
authors.lastname: Shi
mesh_terms: D000284:Administration, Oral; D000818:Animals; D001786:Blood Glucose / Q000032:analysis; D003921:Diabetes Mellitus, Experimental / Q000097:blood / Q000188:drug therapy; D004339:Drug Compounding; D016503:Drug Delivery Systems; D005750:Gastric Juice / Q000378:metabolism; D007004:Hypoglycemic Agents / Q000737:chemistry* / Q000493:pharmacokinetics / Q000494:pharmacology; D007328:Insulin / Q000737:chemistry* / Q000493:pharmacokinetics / Q000494:pharmacology; D007419:Intestinal Secretions / Q000378:metabolism; D019344:Lactic Acid / Q000737:chemistry*; D008297:Male; D008747:Methylcellulose / Q000031:analogs & derivatives* / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles / Q000648:ultrastructure; D011100:Polyglycolic Acid / Q000737:chemistry*; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers / Q000737:chemistry*; D051381:Rats; D017208:Rats, Wistar
chemical_list: D001786:Blood Glucose; D007004:Hypoglycemic Agents; D007328:Insulin; D011108:Polymers; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D008747:Methylcellulose; C053309:hydroxypropyl methylcellulose phthalate