Simple,rapid and specific liquid chromatography-mass spectrometry（LC-MS） methods have been developed and validated for the quantification of cefcapene acid in human plasma and urine.Plasma samples were simply pretre...Simple,rapid and specific liquid chromatography-mass spectrometry（LC-MS） methods have been developed and validated for the quantification of cefcapene acid in human plasma and urine.Plasma samples were simply pretreated with methanol for deproteinization.Urine samples were briefly diluted with methanol-water（50：50,v/v）,and centrifuged to remove large particles.Chromatographic separation was performed on a Hedera ODS-2 column.For the plasma assay,the isocratic mobile phase consisted of 35% solvent A（Methanol） and 65% solvent B（10 mM ammonium acetate buffer solution containing 0.2% folic acid） with a flow rate of 0.3 mL/min.For the urine assay,the isocratic mobile phase consisted of 30% solvent A（Methanol） and 70% solvent B（10 mM ammonium acetate buffer solution containing 0.2% folic acid） with a flow rate of 0.3 mL/min.The assays were linear over the concentration ranges of 0.03-5 μg/mL in plasma and 0.1-400 μg/mL in urine,and were successfully applied to a pharmacokinetic study after single and multiple oral administrations of cefcapene pivoxil hydrochloride tablets in healthy Chinese volunteers.展开更多
Background: We aimed at determining whether the pathogenic bacteria at the onset of disease are genetically different and whether this affects future choice of the therapeutic methods against group A β-hemolytic stre...Background: We aimed at determining whether the pathogenic bacteria at the onset of disease are genetically different and whether this affects future choice of the therapeutic methods against group A β-hemolytic streptococcal acute pharyngitis/tonsillitis. Methods: A pharynx swab was collected from pediatric patients who visited our hospital. The swab was cultured, and hemolytic streptococcus was detected 230 times. We isolated pathogenic bacteria of patients infected more than once and examined the bacteria using pulse-field gel electrophoresis. Results: Based on gene search results, we found that if the period of developing relapse was within 1 month from the first infection, all patients had the same gene. However, all patients in whom reinfection occurred after 6 months or later had different pertinent genes. Conclusions: The number of relapse/reinfection is significant for this disease, and considerably caution is essential for its treatment. No changes to antibacterial drug administration may be necessary for the second administration unless more than 6 months have passed since the first infection.展开更多
目的：建立盐酸头孢卡品酯中7种有机溶剂残留量的检测方法，并进行了方法学研究。方法以N，N二甲基甲酰胺为溶剂，采用DB-1701毛细管柱（30 m ＆#215;0.53 mm，1.0μm），载气为氮气，FID为检测器，采用程序升温，初始柱温40℃，保持10 ...目的：建立盐酸头孢卡品酯中7种有机溶剂残留量的检测方法，并进行了方法学研究。方法以N，N二甲基甲酰胺为溶剂，采用DB-1701毛细管柱（30 m ＆#215;0.53 mm，1.0μm），载气为氮气，FID为检测器，采用程序升温，初始柱温40℃，保持10 min，再以15℃·min-1的速率升至180℃，保持5 min。结果7种残留溶剂均能得到有效的分离，在所考察的溶液浓度范围内线性关系良好，r为0.9989~0.9998，平均回收率为97.9%~103.3%。结论该方法简便、灵敏度高、结果准确、重复性好，可用于原料药中有机残留溶剂的检测。展开更多
文摘Simple,rapid and specific liquid chromatography-mass spectrometry（LC-MS） methods have been developed and validated for the quantification of cefcapene acid in human plasma and urine.Plasma samples were simply pretreated with methanol for deproteinization.Urine samples were briefly diluted with methanol-water（50：50,v/v）,and centrifuged to remove large particles.Chromatographic separation was performed on a Hedera ODS-2 column.For the plasma assay,the isocratic mobile phase consisted of 35% solvent A（Methanol） and 65% solvent B（10 mM ammonium acetate buffer solution containing 0.2% folic acid） with a flow rate of 0.3 mL/min.For the urine assay,the isocratic mobile phase consisted of 30% solvent A（Methanol） and 70% solvent B（10 mM ammonium acetate buffer solution containing 0.2% folic acid） with a flow rate of 0.3 mL/min.The assays were linear over the concentration ranges of 0.03-5 μg/mL in plasma and 0.1-400 μg/mL in urine,and were successfully applied to a pharmacokinetic study after single and multiple oral administrations of cefcapene pivoxil hydrochloride tablets in healthy Chinese volunteers.
文摘Background: We aimed at determining whether the pathogenic bacteria at the onset of disease are genetically different and whether this affects future choice of the therapeutic methods against group A β-hemolytic streptococcal acute pharyngitis/tonsillitis. Methods: A pharynx swab was collected from pediatric patients who visited our hospital. The swab was cultured, and hemolytic streptococcus was detected 230 times. We isolated pathogenic bacteria of patients infected more than once and examined the bacteria using pulse-field gel electrophoresis. Results: Based on gene search results, we found that if the period of developing relapse was within 1 month from the first infection, all patients had the same gene. However, all patients in whom reinfection occurred after 6 months or later had different pertinent genes. Conclusions: The number of relapse/reinfection is significant for this disease, and considerably caution is essential for its treatment. No changes to antibacterial drug administration may be necessary for the second administration unless more than 6 months have passed since the first infection.
