比较MALDI-TOF MS直接涂片法与蛋白提取法鉴定洋葱伯克霍尔德菌群的应用研究

被引:5
作者
孙谦 [1 ]
屈青云 [1 ]
胡燕燕 [2 ]
周宏伟 [2 ]
机构
[1] 中南大学湘雅医院
[2] 浙江大学附属第二医院
关键词
洋葱伯克霍尔德菌群; 基质辅助激光解吸/电离飞行时间质谱; 直接涂片法; 蛋白提取法;
D O I
暂无
中图分类号
R446.5 [微生物学检验];
学科分类号
摘要
目的比较基质辅助激光解吸/电离飞行时间质谱(matrix-assisted laser desorption/ionization time-of-flight mass spectrometry,MALDI-TOF MS)直接涂片法和蛋白提取法鉴定洋葱伯克霍尔德菌群的差异。方法收集118株临床分离经VITEK全自动细菌仪鉴定为洋葱伯克霍尔德菌群菌株,采用MALDI-TOF MS直接涂片法和蛋白提取法进一步分析基因型,同时比较两种鉴定方法之间的优缺点。结果 118株洋葱伯克霍尔德菌群经MALDI-TOF MS两种方法只是鉴定结果分数有所差异,鉴定结果一致,分别为:93株Burkhoderia cencepacia(基因型Ⅲ型),11株多嗜伯克霍尔德菌(基因型Ⅱ型),10株洋葱伯克霍尔德菌(基因型I型),3株越南伯克霍尔德菌(基因型V型),1株吡咯伯克霍尔德菌(基因型Ⅸ型)。MALDI-TOF MS直接涂片法鉴定分数均值2.126,仅9株(7.62%)鉴定结果不可信(分值<1.700),准确鉴定至种(t≥2.300)与准确鉴定至属(t≥1.700)的比例分别为38.98%和92.38%;MALDI-TOF MS蛋白提取法仅2株(1.69%)鉴定结果不可信,准确鉴定至种(t≥2.300)与准确鉴定至属(t≥1.700)的百分比均高于直接涂片法,分别为44.92%和98.31%;但是不同分值分组间准确鉴定至种(分值≥2.300)、鉴定至属(分值≥1.700),两种方法差异均无统计学意义(P>0.05)。结论 MALDI-TOF MS可快速准确地鉴定洋葱伯克霍尔德菌群至基因型,临床标本鉴定时首选MALDI-TOF MS直接涂片法,对于鉴定结果不可信的菌株可进一步采用蛋白提取法鉴定。
引用
收藏
页码:1387 / 1389
页数:3
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