目的探讨表面增强激光解析离子化飞行时间质谱(SELDI-TOF-MS)技术在筛选神经管缺陷胎儿母亲尿液中蛋白质标志物的应用。方法经超声确诊为神经管缺陷胎儿的孕妇20例和正常孕妇15例。神经管缺陷包括脊柱裂10例,无脑儿5例,脑积水5例。所有...目的探讨表面增强激光解析离子化飞行时间质谱(SELDI-TOF-MS)技术在筛选神经管缺陷胎儿母亲尿液中蛋白质标志物的应用。方法经超声确诊为神经管缺陷胎儿的孕妇20例和正常孕妇15例。神经管缺陷包括脊柱裂10例,无脑儿5例,脑积水5例。所有孕妇均取清晨空腹尿5ml,离心后取上清,选用CM10芯片检测。采用PBSⅡC型蛋白质芯片阅读机读取数据。设定优化相对分子质量范围1000～30000Da。数据分析使用Ciphergen protein chip 3.1.1软件。结果共检测到39个尿液差异蛋白质峰,有统计学意义的差异蛋白质峰5个。病例组中有4种蛋白质高表达,相对分子质量分别为8320,8209,9099,10567;1种蛋白质低表达,相对分子质量3458。建立决策分类树,得到带有3个终结点的决策分类树,获得2个标志性蛋白质,分子量为9096,8244。进行留一法交叉验证后,神经管缺陷诊断模型的灵敏度为80.0%,特异度为93.3%。结论应用SELDI-TOF-MS技术可以在孕妇尿液中筛查出神经管缺陷的特异性蛋白质标志物,进一步可用于神经管缺陷产前早期无创诊断。展开更多
The paper described and some experiments we have done on delayed ion extraction in laser desorption/ionization take-of-flight mass spectrometry Which led to much higher mass resolution compared the previous continuous...The paper described and some experiments we have done on delayed ion extraction in laser desorption/ionization take-of-flight mass spectrometry Which led to much higher mass resolution compared the previous continuous mode. By computer modeling and carefully choosing The parameters such- as delayed time and voltage ratio (extracting volt/repelling volt),we have got mass resolution up to 1734(reflect mode) with gramicidine (a-c yano-4-hydroxycinnamic acid as matrix); 2124 with insulin(4HCCA as matrix) and 960 with Corn (2-nitrophyenyl octyl octyl ether as matrix) on our modified lab-built instrument.展开更多
文摘目的探讨表面增强激光解析离子化飞行时间质谱(SELDI-TOF-MS)技术在筛选神经管缺陷胎儿母亲尿液中蛋白质标志物的应用。方法经超声确诊为神经管缺陷胎儿的孕妇20例和正常孕妇15例。神经管缺陷包括脊柱裂10例,无脑儿5例,脑积水5例。所有孕妇均取清晨空腹尿5ml,离心后取上清,选用CM10芯片检测。采用PBSⅡC型蛋白质芯片阅读机读取数据。设定优化相对分子质量范围1000～30000Da。数据分析使用Ciphergen protein chip 3.1.1软件。结果共检测到39个尿液差异蛋白质峰,有统计学意义的差异蛋白质峰5个。病例组中有4种蛋白质高表达,相对分子质量分别为8320,8209,9099,10567;1种蛋白质低表达,相对分子质量3458。建立决策分类树,得到带有3个终结点的决策分类树,获得2个标志性蛋白质,分子量为9096,8244。进行留一法交叉验证后,神经管缺陷诊断模型的灵敏度为80.0%,特异度为93.3%。结论应用SELDI-TOF-MS技术可以在孕妇尿液中筛查出神经管缺陷的特异性蛋白质标志物,进一步可用于神经管缺陷产前早期无创诊断。
文摘The paper described and some experiments we have done on delayed ion extraction in laser desorption/ionization take-of-flight mass spectrometry Which led to much higher mass resolution compared the previous continuous mode. By computer modeling and carefully choosing The parameters such- as delayed time and voltage ratio (extracting volt/repelling volt),we have got mass resolution up to 1734(reflect mode) with gramicidine (a-c yano-4-hydroxycinnamic acid as matrix); 2124 with insulin(4HCCA as matrix) and 960 with Corn (2-nitrophyenyl octyl octyl ether as matrix) on our modified lab-built instrument.
