作者:A. V. Streletskii、A. Yu. Kozlova、D. S. Esipov、A. L. Kayushin、M. D. Korosteleva、S. E. Esipov
DOI:10.1007/s11171-005-0019-3
日期:2005.3
MALDI mass spectrometry (MS) of 14- to 42-mer homogeneous oligonucleotides and their mixtures was carried out using a Vision 2000 instrument (Thermo BioAnalysis, Finnigan, United States). Conditions for the determination of oligonucleotide molecular masses were optimized by applying various matrices and operation modes. The most reproducible results with minimal uncontrolled decomposition of the oligonucleotides including their apurinization during the MALDI MS registration were obtained using 2,4,6-trihydroxyacetophenone as a matrix instead of 3-hydroxypicolinic acid usually employed in the mass spectrometry of oligonucleotides. Our approach allows the determination of molecular masses of oligonucleotides obtained by chemical synthesis and the evaluation of their component composition and purity. It was applied to the mass spectrometric analysis of oligonucleotides containing a 3′-(methyl-C-phosphonate) group or a modified 1,N 6-ethenodeoxyadenosine unit.
使用Vision 2000仪器(Thermo BioAnalysis,美国Finnigan公司)对14至42个单元的均质寡核苷酸及其混合物进行了MALDI质谱(MS)分析。通过应用各种基质和操作模式,优化了寡核苷酸分子质量的测定条件。在MALDI MS登记期间,使用2,4,6-三羟基苯乙酮作为基质代替寡核苷酸质谱分析中常用的3-羟基吡啶甲酸,获得了寡核苷酸最小不可控分解(包括其脱氧)的最可重复的结果。我们的方法可以测定化学合成寡核苷酸的分子质量,并评估其成分组成和纯度。它被应用于含有3′-(甲基-C-磷酸酯)基团或修饰的1,N 6-乙烯脱氧腺苷单元的寡核苷酸的质谱分析。