title: Effects of poly (lactic-co-glycolic acid) as a co-emulsifier on the preparation and hypoglycaemic activity of insulin-loaded solid lipid nanoparticles.
abstract: Poly (lactic-co-glycolic acid) (PLGA) was used as a co-emulsifier in the preparation of insulin-loaded solid lipid nanoparticles (SLN) with hydrogenated castor oil as lipid matrix and lecithin as surfactant by double-emulsion technique. The effects of PLGA on the preparation and hypoglycaemic activity of insulin-loaded SLN were studied. The results showed that with the supplement of PLGA, the encapsulation efficiency and loading capacity were increased significantly from 79.08 +/- 1.62 to 85.57 +/- 3.21% and 1.58 +/- 0.03 to 1.71 +/- 0.06%, whereas the surface charge and particle size were changed insignificantly from -25.87 +/- 2.65 to -22.67 +/- 1.19 mv and 431.0 +/- 16.1 to 397.0 +/- 68.0 nm, respectively. In vivo studies demonstrated that PLGA increased the sustained hypoglycaemic activity from 12 to 36 h and 24 to 120 h in normal and steptozotocin-induced diabetic mice after a single intramuscular injection of the insulin-loaded SLN. These results demonstrated that PLGA could enhance the entrapment of insulin in the nanoparticles, and more importantly, prolong the time of hypoglycaemic activity of the insulin-loaded SLN.
authors.affiliation: Department of Preventive Veterinary Medicine, College of Veterinary Medicine, China Agricultural University, Beijing, People's Republic of China.
authors.forename: S L
authors.initials: SL
authors.lastname: Wang
authors.forename: S Y
authors.initials: SY
authors.lastname: Xie
authors.forename: L Y
authors.initials: LY
authors.lastname: Zhu
authors.forename: F H
authors.initials: FH
authors.lastname: Wang
authors.forename: W Z
authors.initials: WZ
authors.lastname: Zhou
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D001786:Blood Glucose / Q000187:drug effects / Q000378:metabolism; D002368:Castor Oil / Q000737:chemistry; D055598:Chemical Phenomena; D003921:Diabetes Mellitus, Experimental / Q000097:blood / Q000188:drug therapy; D016503:Drug Delivery Systems / Q000379:methods*; D045703:Emulsifying Agents / Q000737:chemistry*; D006016:Glycolates / Q000008:administration & dosage / Q000737:chemistry*; D007003:Hypoglycemia / Q000188:drug therapy / Q000378:metabolism; D007328:Insulin / Q000008:administration & dosage / Q000737:chemistry*; D019344:Lactic Acid; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles / Q000008:administration & dosage / Q000737:chemistry*; D011100:Polyglycolic Acid; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer
chemical_list: D001786:Blood Glucose; D045703:Emulsifying Agents; D006016:Glycolates; D007328:Insulin; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D002368:Castor Oil