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Application of capillary isoelectric focusing and peptide mass fingerprinting in carbohydrate‐deficient transferrin detection
Author(s) -
Luo LianZhong,
Jin HongWei,
Huang HeQing
Publication year - 2011
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.4993
Subject(s) - carbohydrate deficient transferrin , isoelectric focusing , chemistry , chromatography , transferrin , peptide mass fingerprinting , capillary electrophoresis , peptide , proteomics , biochemistry , gene , alcohol , alcohol consumption , enzyme
Carbohydrate‐deficient transferrin (CDT) is a specific biomarker of alcohol abuse and is widely used in clinical diagnosis to detect and follow up excessive alcohol consumption. However, false %CDT results still exist in CDT detection, because of interference from genetic variants and the lack of standardization in CDT analysis. Therefore, it is still very important to find a method with high sensitivity and high accuracy for CDT detection. Here, we compared the detection sensitivity and accuracy of pI values based methods [isoelectric focusing on polyacrylamide gel electrophoresis (IEF‐PAGE) and capillary isoelectric focusing (CIEF)] with hydrophobic characteristic based methods [reversed‐phase high‐performance liquid chromatography (RP‐HPLC)] on CDT detection. Moreover, we investigated the potential of peptide mass fingerprinting (PMF), a method based on the mass spectrometry to identify human transferrin (HTf) variants including CDT isoforms and genetic variants, based on their specific peptide masses. Results indicated that PMF can identify HTf variants including CDT isoforms and genetic variants based on their specific peptides, and CIEF showed higher sensitivity detection of HTf variants than RP‐HPLC and IEF‐PAGE did. Accordingly, we suggest that PMF is suitable for identifying CDT with high accuracy, and CIEF has potential for detection of CDT and genetic variants with high sensitivity; moreover, they are both worth further investigatation in clinical diagnosis. Copyright © 2011 John Wiley & Sons, Ltd.