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Title 

Quick quantification of proteins by MALDI

Authors 

S H AhnJ W KangJeong Hee MoonK P KimS H LeeM S Kim

Publisher 

Wiley-Blackwell

Issue Date 

2015

Citation 

Journal of Mass Spectrometry, vol. 50, no. 3, pp. 596-602

Keywords 

MALDIprotein quantificatonquantification of hGHquantification of myoglobintryptic digestion

Abstract 

Previously, we reported that the matrix-assisted laser desorption ionization spectrum of a peptide became reproducible when an effective temperature was held constant. Using a calibration curve drawn by plotting the peptide-to-matrix ion abundance ratio versus the peptide concentration in a solid sample, a peptide could be quantified without the use of any internal standard. In this work, we quantified proteins by quantifying their tryptic peptides with the aforementioned method. We modified the digestion process; e.g. disulfide bonds were not cleaved, so that hardly any reagent other than trypsin remained after the digestion process. This allowed the preparation of a sample by the direct mixing of a digestion mixture with a matrix solution. We also observed that the efficiency of the matrix-to-peptide proton transfer, as measured by its reaction quotient, was similar for peptides with arginine at the C-terminus. With the reaction quotient averaged over many such peptides, we could rapidly quantify proteins. Most importantly, no peptide standard, not to mention its isotopically labeled analog, was needed in this method.

ISSN 

1076-5174

Link 

http://dx.doi.org/10.1002/jms.3567

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2019-05-02


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