Preparation and Analysis of Acylated Insulin with Dehydrocholic Acid

Insulin was chemically modified with dehydrocholic acid without the use of protecting agents and the main monoacylated insulin, ε-N^BZ9-Dehydrocholyl insulin was obtained selectively and analyzed by PAGE, HPLC and MALDI-TOF-MS.     

Nanjiols D and E, Two New Uncommon Steroids from the Chinese Soft Coral Nephthea bayed

Two new steroids, nanjiols D and E, were isolated from the soft coral Nephthea bayeri. Their structures were characterized by spectroscopic methods and comparison with known compounds.     

Spirostane Steroidal Saponins from the Undergroud Parts of Tupistra chinensis

Two new spirostanol saponins, (25S)-spirostane-1β,3β,5β-trio1 3-O-β-D-glucopyranoide 1 and rhodeasapogenin 3-O-β-D-glucopyranosyl-(1→4)-β-D-glucopyranoside 2, together with a known saponin, rhodeasapogenin 3-O-β-D-glucopyranoside 3, were isolated from the underground parts of Tupistra chinensis Bak.. Their structures were determined by spectroscopic analysis.     

Antioxidant Activity of Ecdysteroids from Serratula strangulata

One new ecdysteroid,(24R)-24-(2-hydroxyethyl)-20-hydrox-yecdysone(3),as well three known ecdysteroids,has been isolated from Chinese herb serratula strangulata and these compoundsd 1-4 showed effective antioxidant activity on AAPH-induced hemolysis of human RBC and Fe^2 cysteine-induced lipid peroxidation of liver microsome.     

超高效液相色谱-串联质谱法测定湿疹膏中67种激素EI北大核心CSCD

建立了湿疹膏中67种激素的超高效液相色谱-串联质谱(UPLC-MS/MS)检测方法。样品先经饱和NaCl溶液分散,再经乙酸乙酯提取,QuEChERS净化后,UPLC-MS/MS检测,选择Waters AcQuityBEH C18色谱柱(1.7μm, 2.1 mm×100 mm),多反应监测模式扫描。67种激素在相应的浓度范围内,线性关系良好,相关系数均大于0.995,在3个不同浓度加标水平下,平均回收率为71.8%~115.9%,相对标准偏差(RSD)为1.7%~12.5%,定量限(LOQ)范围为0.15~1.00μg/kg,该方法能够满足湿疹膏中67种激素的检测需求。     

超高效液相色谱-四极杆-飞行时间质谱法测定牛奶中51种激素

基于超高效液相色谱-四极杆-飞行时间质谱(UPLC-Q-TOF MS),建立了牛奶中51种激素的高通量筛选和定量方法,并采用信息依赖型采集(IDA)模式建立了51种激素的定性筛选数据库。牛奶样品经乙腈沉淀蛋白后,采用氧化锆包覆硅胶(Z-Sep)填料进一步净化。采用Waters Acquity BEH C₁₈(100 mm×2.1 mm,1.7μm)色谱柱进行分离,UPLC-Q-TOF MS测定,基质匹配曲线外标法定量。牛奶中51种激素的线性范围为0.10～500μg/L,相关系数(r2)均大于0.99;检出限为0.03～1.67μg/kg,定量下限为0.10～5.00μg/kg;在5、10、50μg/kg加标水平下的回收率为44.6%～120%,相对标准偏差为0.90%～20%。利用该方法测定了20份市售牛奶样品,其中19份样品检出孕酮,检出量为0.80～4.51μg/kg;1份样品中含有痕量的氢化可的松,检出量为0.62μg/kg;其他激素均未检出。该方法具有良好的线性、灵敏度、准确度和精密度,可用于多种激素的同时定性定量分析。     

类固醇激素的低温等离子体质谱研究

将自行设计和搭建的低温等离子体装置作为离子源,成功地与常压高分辨质谱结合,并将其用于类固醇样品的定性分析.与常规电喷雾质谱相比,用低温等离子体质谱检测类固醇样品具有样品前处理简单、谱图干扰少等优点.对类固醇样品进行了一级质谱以及串联质谱的表征,发现其一级谱图能够体现出类固醇化合物的结构稳定性,而在串联质谱图中则出现了较多的丢水碎片.本工作结合能量计算详细比较分析了典型类固醇样品在碰撞诱导解离(CID)碎裂过程中的丢水过程.另外,通过比较二级质谱的不同以及对其碎裂过程的分析推测,睾酮和去氢表雄酮这对同分异构体得以区分.     

液相色谱-串联质谱法同时测定黄鳝肌肉组织中6种激素残留

建立了同时测定黄鳝肌肉中苯丙酸诺龙、苯甲酸雌二醇、丙酸睾酮、乙酸炔诺酮、左炔诺酮、甲睾酮6种激素的液相色谱-串联质谱法(LC-MS/MS)。试样经酶解后用乙酸乙酯提取,提取液氮吹至近干,用2mL乙腈-水(体积比1∶1)溶解,冷冻离心脱脂净化。用SB-C18色谱柱(50×2.1mm,1.8μm)分离,以乙腈-水为流动相,梯度洗脱,在电喷雾正离子模式下进行多反应监测(MRM)的定性定量分析,外标法定量。6种目标物检出限为0.25~1.0μg/kg,定量限为0.5~2.0μg/kg,6种目标物在0.5~100μg/kg范围内线性相关系数r均大于0.99,在6个加标水平下的平均回收率为70.5%~107.2%,相对标准偏差(RSD)为3.9%~9.5%。该方法的样品前处理简单快速,灵敏度高,适用于黄鳝等蛋白脂肪含量高的动物组织中激素类药物多残留的同时测定。     

固相萃取-衍生化-气相色谱/质谱测定水中类固醇类环境内分泌干扰物

建立了固相萃取-衍生化-气相色谱/质谱联用同时测定水中4种类固醇类环境内分泌干扰物雌酮(E1)、17β-雌二醇(E2)、17α-乙炔基雌二醇(EE2)、雌三醇(E3)的分析方法.通过对比衍生化试剂 N,O-双三甲基硅基三氟乙酰胺(BSTFA)和N-甲基-N-三甲基硅基三氟乙酰胺(MSTFA)的衍生化条件及效果,解释了文...