Metal ion-mobilizing additives for comprehensive detection of femtomole amounts of phosphopeptides by reversed phase LC-MS
Metal ion-mobilizing additives for comprehensive detection of femtomole amounts of phosphopeptides by reversed phase LC-MS
复制标题
用于通过反相 LC-MS 全面检测飞摩尔量磷酸肽的金属离子动员添加剂
DOI:
10.1007/s00726-010-0647-7
复制
发表时间:
2010
期刊:
影响因子:
3.5
通讯作者:
Lehmann WD
中科院分区:
文献类型:
--
作者:
Seidler J;Zinn N;Haaf E;Boehm ME;Winter D;Schlosser A;Lehmann WD
It is hypothesized that metal ion-mediated adsorption of phosphorylated peptides on stationary phases of LC-columns is the major cause for their frequently observed poor detection efficiency in LC-MS. To study this phenomenon in more detail, sample solutions spiked with metal ion-mobilizing additives were analyzed by reversed phase μLC-ICP-MS or nanoLC-ESI-MS. Using μLC-ICP-MS, metal ions were analyzed directly as atomic ions. Using electrospray ionization, either metal ion chelates or phosphopeptide standard mixtures injected in subpicomole amounts were analyzed. Deferoxamine, imidazole, ascorbate, citrate, EDTA, and the tetrapeptide pSpSpSpS were tested as sample additives for the interlinked purposes of metal ion-mobilization and improvement of phosphopeptide recovery. Iron probably represents the major metal ion contamination of reversed phase columns. Based on the certified iron level in LC-grade solvents, a daily metal ion load of >10 pmol was estimated for typical nanoLC flow rates. In addition, phosphopeptide fractions from IMAC columns were identified as source for metal ion contamination of the LC column, as demonstrated for Ga3+-IMAC. The three metal ion-chelating additives, EDTA, citrate and pSpSpSpS, were found to perform best for improving the LC recovery of multiply phosphorylated peptides injected at subpicomole amounts. The benefits of metal ion-mobilizing LC (mimLC) characterized by metal ion complexing sample additives is demonstrated for three different instrumental setups comprising (a) a nanoUPLC-system with direct injection on the analytical column, (b) a nanoLC system with inclusion of a trapping column, and (c) the use of a HPLC-Chip system with integrated trapping and analytical column.
登录
查看更多内容
影响因子:
2
作者:
A. Beck;M. Deeg;K. Moeschel;E. Schmidt;E. Schleicher;W. Voelter;H. Häring;R. Lehmann
通讯作者:
R. Lehmann
影响因子:
3.6
作者:
Giardina,PJ;Grady,RW
通讯作者:
Grady,RW
DOI:
--
发表时间:
1995
期刊:
Journal of chromatography. B, Biomedical applications
影响因子:
--
作者:
F. Gaucheron;D. Mollé;J. Léonil;J. Maubois
通讯作者:
J. Maubois
影响因子:
3.8
作者:
E. Farkas;D. Bátka;H. Csóka;N. Nagy
通讯作者:
N. Nagy
DOI:
--
发表时间:
2022
期刊:
影响因子:
--
作者:
橋本優佑;志田隆史;島圭介;竹内啓晃
通讯作者:
竹内啓晃