摘要
Abstract
A novel method for the determination of isopropyl-β-D-thiogalactopyranoside (IPTG), a sulfur-containing compound, a pharmaceutical additive in commercial recombinant human growth hormone (rhGH), has been developed using pulsed electrochemical detection (PED), following liquid chromatographic separation.A Dionex-500 ion chromatograph coupled with an electrochemical detector was employed, equipped with a gold working electrode and an Acclaim 300 analytical C18 column, with a mobile phase consisting of sodium acetate (NaOAc) buffer (pH 5.45, 0.01 mol/L) and acetonitrile (ACN) (90∶10, v/v).The C18 phase has very high surface coverage, resulting in high capacity.Electrochemical characterization via cyclic voltammetry is the basis of optimization of the integrated pulsed amperometric detection (IPAD) waveform.PED at a gold electrode has proven to be selective for sulfur-containing compounds under mildly acidic conditions.Upon optimization, IPTG was found to have a limit of detection of 1 μg/L (0.1 pmol) with 25 uL injection volume.This method was successfully applied to the determination of IPTG in rhGH samples with the characteristics of simplicity, high sensitivity and good repeatability.The assay is also useful, efficient and low-cost in monitoring disulfide formation kinetics and assuring quality control for biopharmaceuticals.关键词
反相高效液相色谱法/脉冲电化学检测/巯基/含硫化学物/异丙基-β-D-硫代半乳糖苷/重组人生长激素Key words
reversed-phase high performance liquid chromatography (RP-HPLC)/pulsed electrochemical detection (PED)/thiol/sulfur/isopropyl β-D-thiogalactopyranoside (IPTG)/recombinant human growth hormone (rhGH)分类
化学化工
