将胎儿成纤维细胞悬浮于不同的冷冻保护液中 ,在不同的温度下进行冷冻保存试验。结果显示 ,当保护液中含有 90 0 m L / L胎牛血清 (FBS)时 ,- 196℃下保存的山羊胎儿成纤维细胞解冻后的细胞贴壁率高于- 80℃ ,且前者贴壁细胞增殖也较后...将胎儿成纤维细胞悬浮于不同的冷冻保护液中 ,在不同的温度下进行冷冻保存试验。结果显示 ,当保护液中含有 90 0 m L / L胎牛血清 (FBS)时 ,- 196℃下保存的山羊胎儿成纤维细胞解冻后的细胞贴壁率高于- 80℃ ,且前者贴壁细胞增殖也较后者快 ,二者间差异显著 ;而在 - 2 0℃条件下只有一小部分细胞能够存活 ,与前两者相比差异极显著 ,说明 - 2 0℃不适合冷冻胎儿细胞。冷冻保护液中含有 10 0 m L / L二甲基亚砜 (DMSO)的保护效果明显好于 5 0 m L / L DMSO,二者间差异显著。用组织块法培养的细胞 ,在两种培养基 DMEM和 M199中添加 10 0 m L / L FBS和 2 mm ol/ L 2 -巯基乙醇 (2 - Me) ,其组织块成活率及细胞生长速度均高于单纯添加 10 0 m L / LFBS,同时证明 DMEM和 M199都能用于胎儿成纤维细胞的体外培养。以 DMEM培养液为基础 ,分别添加 2mm ol/ L 2 - Me,5 m L / L FBS,10 0 m L / L FBS和 2 m mol/ L 2 - Me+10 0 m L / L FBS对山羊胎儿成纤维细胞进行体外培养 ,结果显示 ,细胞在 10 0 m L / L FBS和 2 mm ol/ L 2 - Me+10 0 m L / L FBS培养液中生长迅速 ,两者间无明显差异 ,2 - Me的存在促进了细胞的增殖 ;两者都与添加 2 m mol/ L 2 - Me组存在显著差异 ;添加 2 m mol/ L 2 - Me和 5m L / L展开更多
A sensitive method based on high-performance liquid chromatography-tandem mass spectrometry （LC- MS/MS） has been developed for the simultaneous determination of folic acid （FA） and its active meta- bolite, 5-methy...A sensitive method based on high-performance liquid chromatography-tandem mass spectrometry （LC- MS/MS） has been developed for the simultaneous determination of folic acid （FA） and its active meta- bolite, 5-methyltetrahydrofolic acid （5-M-THF）, in human plasma. The analytes were extracted from plasma with methanol solution containing 10 mg/mL of 2-mercaptoethanol and 0.025% （v/v） ammonium hydroxide. FA and 5-M-THF were more stable after the addition of 2-mercaptoethanol and ammonium hydroxide in the sample preparation procedures of this study than they were in the previously published methods. Chromatographic separation was performed on a Hedera ODS-2 column using a gradient elution system of acetonitrile and 1 mM ammonium acetate buffer solution containing 0.6% formic acid as mobile phase. LC-MS/MS was carried out with an ESI ion-source and operated in the multiple reaction monitoring （MRM） mode. The assay was linear over the concentration ranges of 0.249-19.9 ng/mL for FA, and 5.05-50.5 ng/mL for 5-M-THF. The developed LC-MS/MS method offers increased sensitivity for quantification of FA and 5-M-THF in human plasma and was applicable to a pharmacokinetic study of FA and 5-M-THF.展开更多
Mononuclear copper phthalocyanine (CuPc) and binuclear copper phthalocyanine (Cu2Pc2) were synthesized by the phenylanhydride-urea route, and their catalytic oxidation activity on 2-mercaptoethanol was studied. Based ...Mononuclear copper phthalocyanine (CuPc) and binuclear copper phthalocyanine (Cu2Pc2) were synthesized by the phenylanhydride-urea route, and their catalytic oxidation activity on 2-mercaptoethanol was studied. Based on the experimental results, a catalytic mechanism of Cu2Pc2 on 2-mercaptoethanol has been proposed. Furthermore, the effects of pH, Cu2Pc2 concentration, and temperature on the catalytic oxidation activity were evaluated. The results showed that CuPc has no catalytic activity, while Cu2Pc2 has high catalytic oxidation activity towards 2-mercaptoethanol with the optimal activity at pH 11. The reaction can further be enhanced by increasing Cu2Pc2 concentration and temperature, due to its endothermic characteristics.展开更多
文摘将胎儿成纤维细胞悬浮于不同的冷冻保护液中 ,在不同的温度下进行冷冻保存试验。结果显示 ,当保护液中含有 90 0 m L / L胎牛血清 (FBS)时 ,- 196℃下保存的山羊胎儿成纤维细胞解冻后的细胞贴壁率高于- 80℃ ,且前者贴壁细胞增殖也较后者快 ,二者间差异显著 ;而在 - 2 0℃条件下只有一小部分细胞能够存活 ,与前两者相比差异极显著 ,说明 - 2 0℃不适合冷冻胎儿细胞。冷冻保护液中含有 10 0 m L / L二甲基亚砜 (DMSO)的保护效果明显好于 5 0 m L / L DMSO,二者间差异显著。用组织块法培养的细胞 ,在两种培养基 DMEM和 M199中添加 10 0 m L / L FBS和 2 mm ol/ L 2 -巯基乙醇 (2 - Me) ,其组织块成活率及细胞生长速度均高于单纯添加 10 0 m L / LFBS,同时证明 DMEM和 M199都能用于胎儿成纤维细胞的体外培养。以 DMEM培养液为基础 ,分别添加 2mm ol/ L 2 - Me,5 m L / L FBS,10 0 m L / L FBS和 2 m mol/ L 2 - Me+10 0 m L / L FBS对山羊胎儿成纤维细胞进行体外培养 ,结果显示 ,细胞在 10 0 m L / L FBS和 2 mm ol/ L 2 - Me+10 0 m L / L FBS培养液中生长迅速 ,两者间无明显差异 ,2 - Me的存在促进了细胞的增殖 ;两者都与添加 2 m mol/ L 2 - Me组存在显著差异 ;添加 2 m mol/ L 2 - Me和 5m L / L
文摘A sensitive method based on high-performance liquid chromatography-tandem mass spectrometry （LC- MS/MS） has been developed for the simultaneous determination of folic acid （FA） and its active meta- bolite, 5-methyltetrahydrofolic acid （5-M-THF）, in human plasma. The analytes were extracted from plasma with methanol solution containing 10 mg/mL of 2-mercaptoethanol and 0.025% （v/v） ammonium hydroxide. FA and 5-M-THF were more stable after the addition of 2-mercaptoethanol and ammonium hydroxide in the sample preparation procedures of this study than they were in the previously published methods. Chromatographic separation was performed on a Hedera ODS-2 column using a gradient elution system of acetonitrile and 1 mM ammonium acetate buffer solution containing 0.6% formic acid as mobile phase. LC-MS/MS was carried out with an ESI ion-source and operated in the multiple reaction monitoring （MRM） mode. The assay was linear over the concentration ranges of 0.249-19.9 ng/mL for FA, and 5.05-50.5 ng/mL for 5-M-THF. The developed LC-MS/MS method offers increased sensitivity for quantification of FA and 5-M-THF in human plasma and was applicable to a pharmacokinetic study of FA and 5-M-THF.
基金This work was supported by the National Natural Science Foundation of China (Grant No. 50373038) Program for New Century Excellent Talents in University (NCET-04-0559) Zhejiang Key International Cooperation Project.
文摘Mononuclear copper phthalocyanine (CuPc) and binuclear copper phthalocyanine (Cu2Pc2) were synthesized by the phenylanhydride-urea route, and their catalytic oxidation activity on 2-mercaptoethanol was studied. Based on the experimental results, a catalytic mechanism of Cu2Pc2 on 2-mercaptoethanol has been proposed. Furthermore, the effects of pH, Cu2Pc2 concentration, and temperature on the catalytic oxidation activity were evaluated. The results showed that CuPc has no catalytic activity, while Cu2Pc2 has high catalytic oxidation activity towards 2-mercaptoethanol with the optimal activity at pH 11. The reaction can further be enhanced by increasing Cu2Pc2 concentration and temperature, due to its endothermic characteristics.
