title: Quantitative determination of insulin entrapment efficiency in triblock copolymeric nanoparticles by high-performance liquid chromatography.
abstract: A rapid and effective isocratic chromatographic procedure was described in this paper for the determination of insulin entrapment efficiency (EE) in triblock copolymeric nanoparticles using reversed-phase high-performance liquid chromatography (RP-HPLC) with an ultraviolet/visible detector at low flow rate. The method has been developed on a Shimadzu Shim-pack VP-ODS column (150 mm x 4.6 mm, 5 microm, Chiyoda-Ku, Tokyo, Japan) using a mixture of 0.2 M sodium sulfate anhydrous solution adjusted to pH 2.3 with phosphoric acid and acetonitrile (73:27, v/v) as mobile phase at the flow rate of 0.8 ml min(-1) and a 214 nm detection. The method was validated in terms of selectivity, linearity, precision, accuracy, solution stability, limit of detection (LOD) and limit of quantification (LOQ). The calibration curve was linear in the concentration range of 2.0-500.0 microg ml(-1), and the limits of detection and quantitation were 8 and 20 ng, respectively. The mean recovery of insulin from spiked samples, in a concentration range of 8-100 microg ml(-1), was 98.96% (R.S.D.= 2.51%, n = 9). The intra- and inter-assay coefficients of variation were less than 2.24%. The proposed method has the advantages of simple pretreatment, rapid isolation, high specificity and precision, which can be used for direct analysis of insulin in commercially available raw materials, formulations of nanoparticles, and drug release as well as stability studies.
authors.affiliation: West China School of Pharmacy, Sichuan University, No. 17, Section 3, Renmin Nan Road, Chengdu, Sichuan 610041, PR China.
authors.forename: Xiongliang
authors.initials: X
authors.lastname: Xu
authors.forename: Yao
authors.initials: Y
authors.lastname: Fu
authors.forename: Haiyan
authors.initials: H
authors.lastname: Hu
authors.forename: Yourong
authors.initials: Y
authors.lastname: Duan
authors.forename: Zhirong
authors.initials: Z
authors.lastname: Zhang
mesh_terms: D000097:Acetonitriles / Q000737:chemistry; D002138:Calibration; D002626:Chemistry, Pharmaceutical / Q000379:methods*; D002845:Chromatography; D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation / Q000379:methods*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007328:Insulin / Q000032:analysis* / Q000097:blood; D049329:Nanostructures / Q000737:chemistry*; D010756:Phosphoric Acids / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D015203:Reproducibility of Results; D013678:Technology, Pharmaceutical / Q000379:methods*; D013997:Time Factors
chemical_list: D000097:Acetonitriles; D007328:Insulin; D010756:Phosphoric Acids; D011108:Polymers; C030242:phosphoric acid; C032159:acetonitrile