TY - JOUR
T1 - Quantification of peptides for the monitoring of protease-catalyzed reactions by matrix-assisted laser desorption/ionization mass spectrometry using ionic liquid matrixes
AU - Tholey, Andreas
AU - Zabet-Moghaddam, Masoud
AU - Heinzle, Elmar
N1 - Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2006/1/1
Y1 - 2006/1/1
N2 - Ionic liquid matrixes (ILM) have been shown to allow very homogeneous sample preparations, facilitating relative quantifications using internal standards in matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS). In the present work, the ability to perform quantifications of peptides without using internal standards in these matrixes was investigated. Linear correlations between peptide amount and signal intensities could be observed when increased molar matrix-to-analyte ratios were applied. The dynamic range of linearity was ∼1 order of magnitude. The method was applied successfully to monitor the time-dependent evolution of substrates and products in trypsin-catalyzed digests of single peptides and peptide mixtures. Thus, ionic liquid matrixes allow quantitative MALDI-MS without the need for internal standards, making the method a suitable tool for the fast screening of new enzymes or the search for substrates or inhibitors.
AB - Ionic liquid matrixes (ILM) have been shown to allow very homogeneous sample preparations, facilitating relative quantifications using internal standards in matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS). In the present work, the ability to perform quantifications of peptides without using internal standards in these matrixes was investigated. Linear correlations between peptide amount and signal intensities could be observed when increased molar matrix-to-analyte ratios were applied. The dynamic range of linearity was ∼1 order of magnitude. The method was applied successfully to monitor the time-dependent evolution of substrates and products in trypsin-catalyzed digests of single peptides and peptide mixtures. Thus, ionic liquid matrixes allow quantitative MALDI-MS without the need for internal standards, making the method a suitable tool for the fast screening of new enzymes or the search for substrates or inhibitors.
UR - http://www.scopus.com/inward/record.url?scp=30044440883&partnerID=8YFLogxK
U2 - 10.1021/ac0514319
DO - 10.1021/ac0514319
M3 - Article
C2 - 16383339
AN - SCOPUS:30044440883
VL - 78
SP - 291
EP - 297
JO - Analytical Chemistry
JF - Analytical Chemistry
SN - 0003-2700
IS - 1
ER -