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通过高效毛细管电泳法(HPCE),建立一种检测齐考诺肽含量的方法。本文利用线性、精密度、稳定性、重现性、加样回收率等实验,利用HPCE法检测合成的齐考诺肽样品中齐考诺肽的含量,测定齐考诺肽在100-500mg/mL(r=0.999)范围内成良好的线性关系,精密度、重现性、稳定性、加样回收率等实验的RSD值均小于3%,加样回收率平均值为100.18%。本文首次利用HPCE法建立了检测齐考若肽含量的测定方法。结果表明此法线性好、精密度高、重现性好、结果准确,前处理简单;HPCE操作简单,分析速度快,适合齐考诺肽的含量检测。 相似文献
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目的:建立奶制品中三聚氰胺的含量测定方法。方法:采用高效毛细管电泳法测定,以30mmol/L 磷酸盐缓冲液(pH5.0)为电泳介质,未涂层石英毛细管(75μm× 78cm,有效长度70cm)为分离通道,紫外检测波长240nm,分离电压10kV。结果:三聚氰胺在10.0~50.0μg/mL 范围内线性关系良好,r=0.9992。平均加标回收率为97.04%,平均RSD 为1.24%(n=3)。结论:该方法快速简便、灵敏度高、重现性好,可用于奶制品中三聚氰胺含量的测定。 相似文献
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Alicia B Pomilio Silvia P Trajtemberg Arturo A Vitale 《Journal of the science of food and agriculture》2005,85(4):622-628
Micellar electrokinetic capillary chromatography (MECC) experimental conditions were applied to 12 samples of methylxanthine‐containing infusions of different commercial brands of yerba mate, coffee, tea and cocoa as well as two cola drinks. The best resolution in this mode of automated high‐performance capillary electrophoresis (HPCE) was achieved here when using 15 kV voltage in an uncoated fused‐silica capillary of 45 cm length (40 cm effective length), 50 mM sodium dodecylsulfate, 90 mM pH 8.5 borate buffer and UV detection. Theobromine, caffeine and theophylline were separated, and the peak splitting due to tautomeric species was observed. Experimental conditions were controlled, keeping constant the size of the elution window in each analysis. The limit of detection was less than 1 mg l?1, the limit of quantitation was 2.5 mg l?1 and the work range was 2.5–300 mg l?1. This HPCE–MECC system has proved suitable for the analysis/quality control of xanthines in beverages for consumption. Roles of various parameters as well as distinctly charged species of each xanthine and the origin of peak splitting in this MECC system are discussed. Copyright © 2004 Society of Chemical Industry 相似文献
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黄酒生产与陈化过程中发生酸败变质,是黄酒业面临的头等难题。本文中以黄酒原酒为对象,从检测波长、缓冲液组成、分离电压等方面对高效毛细管区带电泳法检测黄酒组分的条件进行研究。结果表明,选择检测波长215nm、0.075nmol/L的pH=10.0的磷酸氢二钠-四硼酸钠缓冲液、分离电压8kV检测,可以得到理想的黄酒原酒、黄酒料酒与酸败黄酒原酒的高效毛细管区带电泳图谱。通过对比分析,确定导致酸败的可能组分峰位于保留时间27.031.0min区段。研究结果为黄酒酸败组分的检出、质量标准构建及黄酒生产过程中的质量控制奠定基础,具有一定的应用价值。 相似文献
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毛细管电泳测定钩藤中钩藤碱、异钩藤碱、去氢钩藤碱的含量 总被引:1,自引:0,他引:1
建立了钩藤中钩藤碱、异钩藤碱、去氢钩藤碱的含量的测定方法:采用高效毛细管电泳法,运行缓冲液为25 mmol/L磷酸盐缓冲液(磷酸调pH为2.5)-甲醇(体积比为4∶1),运行电压21 kV,柱温25℃,检测波长250 nm。结果:钩藤碱、异钩藤碱、去氢钩藤、线性范围分别为0.00176~0.01760 mg/mL(r=0.9998),0.00183~0.01830 mg/mL(r=0.9996),0.00101~0.01010 mg/mL(r=0.9998),加样回收率(n=6)分别为99.73%(RSD1.17%)、99.23%(RSD 1.23%)、98.91%(RSD1.02%)。试验证明该法操作简便,分析快速,结果准确,重现性好,适用于立钩藤中钩藤碱、异钩藤碱、去氢钩藤碱的含量的测定。 相似文献
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