The application belongs to the technical field of
protein standard substance value determination, and particularly relates to a TNF-
alpha value determination method based on
a peptide segment
isotope dilution mass spectrometry. The application discloses a TNF-
alpha value determination method based on
a peptide segment
isotope dilution mass spectrometry, which comprises characteristic
peptide segment selection (determining ANALLANGVELR and VNLLSAIK as the characteristic
peptide segments for quantification according to the
amino acid sequence of TNF-alpha), characteristic
peptide segment purity determination, characteristic peptide segment
mass spectrometry parameter optimization, characteristic peptide segment
linear range determination, TNF-
alpha protein sample pretreatment, sample
enzyme cutting solution
mass spectrometry analysis, and characteristic peptide segment content calculation. Finally, the concentration of the
target protein in the solution is calculated according to the molecular weights of TNF-alpha and the characteristic peptide segments, and is taken as the quantification result. The TNF-alpha specificity determined by the method is high, and the peptide segments can be traced to the national
amino acid standard substance, and finally traced to the SI
unit system, so that the accuracy and reliability of the quantification result are ensured.