Quantification of Proteins by Measuring the Sulfur Content of Their Constituent Peptides by Means of Nano HPLC-ICPMS

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  • SUZUKI Yoshinari
    Faculty of Science and Engineering, Department of Applied Chemistry, Chuo University
  • NOBUSAWA Ayumi
    Faculty of Science and Engineering, Department of Applied Chemistry, Chuo University
  • FURUTA Naoki
    Faculty of Science and Engineering, Department of Applied Chemistry, Chuo University

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Abstract

The sulfur (S) concentrations of three peptides were determined by using nano HPLC-ICPMS under a flow of O2 in an octapole reaction cell, and the determined values showed a good agreement with theoretical values. This method was then applied to trypsin-digested peptides from human albumin for protein quantification. Assigning of the number of S atoms in each peptide/peak and the tryptic digestion efficiency were important for protein quantification. The number of S atoms in each peptide/peak was assigned by using verification scores that gave the lowest standard deviation of the peptide S concentration and the highest S recovery. The peptide concentrations were calculated as the ratio of the S concentration/the number of S atoms in the peptide/peak. The tryptic digestion efficiency was calculated as the sum of the S concentration in the mono-peptides divided by the total S concentration in a native polyacrylamide gel electrophoresis (PAGE) band before tryptic digestion. Our result indicates that a protein can be quantified through peptide quantification, after taking into account the tryptic digestion efficiency, via S quantification using ICPMS.

Journal

  • Analytical Sciences

    Analytical Sciences 30 (5), 551-559, 2014

    The Japan Society for Analytical Chemistry

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