背景与目的肺癌是当今世界上最常见的恶性肿瘤之一,迄今缺乏临床诊断可用的分子标志物。本实验应用SELDI技术寻找肺癌新的血清标志物。方法对227例血清样品(包括146例肺癌、13例肺炎、28例结核性胸膜炎和40例正常人血清样品)进行蛋白质...背景与目的肺癌是当今世界上最常见的恶性肿瘤之一,迄今缺乏临床诊断可用的分子标志物。本实验应用SELDI技术寻找肺癌新的血清标志物。方法对227例血清样品(包括146例肺癌、13例肺炎、28例结核性胸膜炎和40例正常人血清样品)进行蛋白质谱检测。对候选蛋白进行质谱鉴定,并结合免疫共沉淀和ELISA技术筛选出肺癌新的候选标志物。结果通过Biomarker WizardTM软件分析显示13.78kDa、13.90kDa和14.07kDa的蛋白峰在肺癌病人血清样品中明显低于对照组。通过1-D胶分离,质谱鉴定和免疫沉淀分析显示这3个差异蛋白峰为野生型甲状腺运载蛋白(nativeTTR)和它的两个变体(cysTTR and glutTTR)。ELISA和SELDI技术分析上述血清样品均发现TTRs在肺癌血清中的表达下调。结论采用SELDI技术首次筛选并鉴定出TTRs,表明其可能作为肺癌诊断的候选血清标志物。展开更多
Euphorbia lathyris （Caper spurge） is a toxic and potent Chinese materia medica （T/PCMM）. This study sought a method for identifying five diterpenoids （Euphorbia factors LI-L3, L7a, and Ls） with the spectra of UV...Euphorbia lathyris （Caper spurge） is a toxic and potent Chinese materia medica （T/PCMM）. This study sought a method for identifying five diterpenoids （Euphorbia factors LI-L3, L7a, and Ls） with the spectra of UV and mass, quantifying three diterpenoids L1, L2, and L8 in crude extracts of unprocessed and processed E. lathyris seeds by liquid chromatography/ electrospray ionization mass spectrometry （LC-ESI-MS）. The analysis was achieved on an Agilent Eclipse XDB-C18 column （4.6 mm× 150mm i.d., 5 μm） with an isocratic elution with a mobile phase consisting of water and acetonitrile at a flow rate of 0.25 mL/min at column temperature of 30 ℃ and UV detection was set at 272 nm. An ESI source was used with a positive ionization mode. The calibration curve was linear in the ranges of 9.9-79 μg/mL for Euphorbia factor Lb 3.8-30.5μg/mL for Euphorbia factor L2, and 1.0-20.6 μg/mL for Euphorbia factor LB. The average recoveries （n=6） of three diterpenoids were 98.39%, 91.10% and 96.94%, respectively, with RSD of 2.5%, 2.4% and 2.1%, respectively. The contents of the three diterpenoids in processed E. lathyris seeds were 3.435, 1.367 and 0.286 mg/g, respectively, which decreased more sharply than those in unprocessed E. lathyris seeds which were 4.915, 1.944 and 0.425 mg/g, respectively. The method is simple, accurate, reliable and reproducible, and it can be applied to control the quality of unprocessed and processed E. lathyris seeds.展开更多
Nitryl chloride(ClNO2)is a product of nocturnal halogen activation of nitrogen oxides and has potential to impact atmospheric photochemistry.Here we report the first observation result of ClNO2in an Asian environment....Nitryl chloride(ClNO2)is a product of nocturnal halogen activation of nitrogen oxides and has potential to impact atmospheric photochemistry.Here we report the first observation result of ClNO2in an Asian environment.The measurements were made with a thermal decomposition chemical ionization mass spectrometer at a coastal site in southern China during late summer of 2012.A clear diurnal pattern of ClNO2was observed with nighttime 1-min average mixing ratio up to 1997 pptv,which is among the highest values ever reported in the world.The elevated ClNO2mixing ratios were observed in plumes from Hong Kong and the Pearl River Delta region compared to the lower levels in maritime air.Calculations suggest that the production of chlorine atom from photolysis of ClNO2in the early morning exceeds the production of hydroxyl radical via ozone photolysis by several factors.Therefore,ClNO2plays an important role in jump-starting the atmospheric photochemistry in polluted marine boundary layer of southern China.展开更多
文摘背景与目的肺癌是当今世界上最常见的恶性肿瘤之一,迄今缺乏临床诊断可用的分子标志物。本实验应用SELDI技术寻找肺癌新的血清标志物。方法对227例血清样品(包括146例肺癌、13例肺炎、28例结核性胸膜炎和40例正常人血清样品)进行蛋白质谱检测。对候选蛋白进行质谱鉴定,并结合免疫共沉淀和ELISA技术筛选出肺癌新的候选标志物。结果通过Biomarker WizardTM软件分析显示13.78kDa、13.90kDa和14.07kDa的蛋白峰在肺癌病人血清样品中明显低于对照组。通过1-D胶分离,质谱鉴定和免疫沉淀分析显示这3个差异蛋白峰为野生型甲状腺运载蛋白(nativeTTR)和它的两个变体(cysTTR and glutTTR)。ELISA和SELDI技术分析上述血清样品均发现TTRs在肺癌血清中的表达下调。结论采用SELDI技术首次筛选并鉴定出TTRs,表明其可能作为肺癌诊断的候选血清标志物。
基金supported by the Natural Science Foundation of Zhejiang Province,China (Y2080137)
文摘Euphorbia lathyris （Caper spurge） is a toxic and potent Chinese materia medica （T/PCMM）. This study sought a method for identifying five diterpenoids （Euphorbia factors LI-L3, L7a, and Ls） with the spectra of UV and mass, quantifying three diterpenoids L1, L2, and L8 in crude extracts of unprocessed and processed E. lathyris seeds by liquid chromatography/ electrospray ionization mass spectrometry （LC-ESI-MS）. The analysis was achieved on an Agilent Eclipse XDB-C18 column （4.6 mm× 150mm i.d., 5 μm） with an isocratic elution with a mobile phase consisting of water and acetonitrile at a flow rate of 0.25 mL/min at column temperature of 30 ℃ and UV detection was set at 272 nm. An ESI source was used with a positive ionization mode. The calibration curve was linear in the ranges of 9.9-79 μg/mL for Euphorbia factor Lb 3.8-30.5μg/mL for Euphorbia factor L2, and 1.0-20.6 μg/mL for Euphorbia factor LB. The average recoveries （n=6） of three diterpenoids were 98.39%, 91.10% and 96.94%, respectively, with RSD of 2.5%, 2.4% and 2.1%, respectively. The contents of the three diterpenoids in processed E. lathyris seeds were 3.435, 1.367 and 0.286 mg/g, respectively, which decreased more sharply than those in unprocessed E. lathyris seeds which were 4.915, 1.944 and 0.425 mg/g, respectively. The method is simple, accurate, reliable and reproducible, and it can be applied to control the quality of unprocessed and processed E. lathyris seeds.
基金supported by the Research Grants Council of Hong Kong(PolyU5015/12P)
文摘Nitryl chloride(ClNO2)is a product of nocturnal halogen activation of nitrogen oxides and has potential to impact atmospheric photochemistry.Here we report the first observation result of ClNO2in an Asian environment.The measurements were made with a thermal decomposition chemical ionization mass spectrometer at a coastal site in southern China during late summer of 2012.A clear diurnal pattern of ClNO2was observed with nighttime 1-min average mixing ratio up to 1997 pptv,which is among the highest values ever reported in the world.The elevated ClNO2mixing ratios were observed in plumes from Hong Kong and the Pearl River Delta region compared to the lower levels in maritime air.Calculations suggest that the production of chlorine atom from photolysis of ClNO2in the early morning exceeds the production of hydroxyl radical via ozone photolysis by several factors.Therefore,ClNO2plays an important role in jump-starting the atmospheric photochemistry in polluted marine boundary layer of southern China.
