Erythropoietin (EPO) is a glycoprotein with three N-glycosylation sites and one O-glycosylation sites. According to the reference, all of the N-glyco-chains were acid complex type. The amount of sialic acid in rhEPO w...Erythropoietin (EPO) is a glycoprotein with three N-glycosylation sites and one O-glycosylation sites. According to the reference, all of the N-glyco-chains were acid complex type. The amount of sialic acid in rhEPO was determined and two N-glycosylation sites on it were confirmed by matrix-assisted laser desorption time of flight-time of flight mass spectrometry (MALDI-TOF-TOFMS) in this paper. The total amount of sialic acid in rhEPO accounts for 12.97%. Two N-glycosylation sites (Asn38,Asn83) were identified successfully.展开更多
目的探讨基质辅助激光解吸附电离飞行时间质谱(matrix assisted laser desorption ionization ti me of flight mass spectrometry,MALDI-TOF-MS)对宫颈鳞癌(squamous carcinoma of thecervix,SCC)组织切片直接分析,获取宫颈鳞癌早期浸...目的探讨基质辅助激光解吸附电离飞行时间质谱(matrix assisted laser desorption ionization ti me of flight mass spectrometry,MALDI-TOF-MS)对宫颈鳞癌(squamous carcinoma of thecervix,SCC)组织切片直接分析,获取宫颈鳞癌早期浸润的分子标志物的有效性。方法利用超微量点样枪将化学基质直接点样到宫颈鳞癌组织切片上,然后利用基质辅助激光解吸附电离飞行时间质谱直接扫描宫颈鳞癌组织切片,分析宫颈鳞癌组织蛋白质分子。结果获得的25种蛋白质质谱峰强度比较,差异有显著意义(P<0.05)。其中7种差异蛋白质有分类意义,其质/核(M/Z)分别为:m/z3433,m/z4786,m/z10092,m/z10835,m/z15114,m/z15854和m/z16345。差异蛋白质m/z3433,m/z15114,m/z15854在宫颈鳞癌鳞状上皮组织高度表达,可作为宫颈鳞癌早期诊断的标志蛋白;差异蛋白质m/z16345在宫颈鳞癌的间质组织高度表达,可作为宫颈鳞癌早期间质浸润和扩散诊断的标志蛋白。结论利用基质辅助激光解吸附电离飞行时间质谱技术成功获取一组差异蛋白质。该差异蛋白组可望作为宫颈鳞癌早期诊断的标志蛋白。展开更多
文摘Erythropoietin (EPO) is a glycoprotein with three N-glycosylation sites and one O-glycosylation sites. According to the reference, all of the N-glyco-chains were acid complex type. The amount of sialic acid in rhEPO was determined and two N-glycosylation sites on it were confirmed by matrix-assisted laser desorption time of flight-time of flight mass spectrometry (MALDI-TOF-TOFMS) in this paper. The total amount of sialic acid in rhEPO accounts for 12.97%. Two N-glycosylation sites (Asn38,Asn83) were identified successfully.
文摘目的探讨基质辅助激光解吸附电离飞行时间质谱(matrix assisted laser desorption ionization ti me of flight mass spectrometry,MALDI-TOF-MS)对宫颈鳞癌(squamous carcinoma of thecervix,SCC)组织切片直接分析,获取宫颈鳞癌早期浸润的分子标志物的有效性。方法利用超微量点样枪将化学基质直接点样到宫颈鳞癌组织切片上,然后利用基质辅助激光解吸附电离飞行时间质谱直接扫描宫颈鳞癌组织切片,分析宫颈鳞癌组织蛋白质分子。结果获得的25种蛋白质质谱峰强度比较,差异有显著意义(P<0.05)。其中7种差异蛋白质有分类意义,其质/核(M/Z)分别为:m/z3433,m/z4786,m/z10092,m/z10835,m/z15114,m/z15854和m/z16345。差异蛋白质m/z3433,m/z15114,m/z15854在宫颈鳞癌鳞状上皮组织高度表达,可作为宫颈鳞癌早期诊断的标志蛋白;差异蛋白质m/z16345在宫颈鳞癌的间质组织高度表达,可作为宫颈鳞癌早期间质浸润和扩散诊断的标志蛋白。结论利用基质辅助激光解吸附电离飞行时间质谱技术成功获取一组差异蛋白质。该差异蛋白组可望作为宫颈鳞癌早期诊断的标志蛋白。