Influence of blood proteins on biomedical analysis. IX Protective effects of human serum proteins on anion-induced degradation of gliclazide.
作者:KUNIO KOBAYASHI、AYUMI IGAKI、MASAKO KIMURA、TAKAFUMI SAKOGUCHI、MITSUKO SHIMOSAWA、AKIRA MATSUOKA
DOI:10.1248/cpb.34.2957
日期:——
Gliclazide, 1-(3-azabicyclo[3.3.0]oct-3-yl)-3-(p-tolylsulfonyl)urea, an oral hypoglycemic drug having the sulfonylurea structure, was completely degraded in a medium containing more than 0.2M chloride or bromide ion at 37°C after 24h. Other sulfonylureas, tolazamide and glycopyramide, were also degraded in the presence of chloride ion, but tolbutamide, acetohexamide, chlorpropamide and glibenclamide were not. Fluoride, carbonate, acetate, sulfate and phosphate ions and both sodium and potassium cations induced slight degradation of gliclazide. Two degradation products were isolated, crystallized, and identified as a hydrazine compound (3-azabicyclo[3.3.0]oct-3-yl-amine monohydrochloride) and p-toluenesulfonamide based on mp, ultraviolet, infrated, proton nuclear magnetic resonance, mass spectra and high performance liquid chromatography data. The anion-induced gliclazide degradation was dose-dependently depressed by human serum albumin or other proteins. It was completely depressed by albumin at over 0.3 mg/ml. Other serum proteins, α, β and γ-globulins, depressed the anion (Cl-)-induced gliclazide degradation similarly to albumin.
格列齐特(1-(3-氮杂双环[3.3.0]辛-3-基)-3-(对甲苯磺酰基)脲,一种具有磺脲结构的口服降糖药)在含有超过0.2M氯离子或溴离子的介质中,于37°C下24小时后完全降解。其他磺脲类药物,如甲苯磺丁脲和格列吡嗪,也在氯离子存在下发生降解,但甲苯磺丁脲、乙酰磺环己脲、氯磺丙脲和格列本脲则不降解。氟离子、碳酸根离子、乙酸根离子、硫酸根离子和磷酸根离子以及钠离子和钾离子均引发格列齐特轻微降解。分离出两种降解产物,经结晶并根据熔点、紫外光谱、红外光谱、质子核磁共振、质谱和高性能液相色谱数据鉴定为肼类化合物(3-氮杂双环[3.3.0]辛-3-基胺单盐酸盐)和对甲苯磺酰胺。人血清白蛋白或其他蛋白质剂量依赖性地抑制了阴离子引发的格列齐特降解。当白蛋白浓度超过0.3 mg/ml时,可完全抑制该降解。其他血清蛋白,如α、β和γ球蛋白,对阴离子(氯离子)引发的格列齐特降解的抑制效果与白蛋白相似。