Abstract
Isotope dilution mass spectrometry (IDMS), an important metrological method, is widely used for absolute quantification of peptides and proteins. IDMS employs an isotope-labeled peptide or protein as an internal standard although the use of a protein provides improved accuracy. Generally, the isotope-labeled protein is obtained by stable isotope labeling by amino acids in cell culture (SILAC) technology. However, SILAC is expensive, laborious, and time-consuming. To overcome these drawbacks, a novel universal SI-traceable IDMS method for absolute quantification of proteins in a matrix is described with human transferrin (hTRF). The hTRF and a human serum sample were labeled with different tandem mass tags (TMTs). After mixing the TMT-labeled hTRF and serum sample together followed by digestion, the peptides were separated by nano-liquid chromatography and analyzed by matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF-MS). Using the signature peptides, we calculated the ratios of reporter ions from the TMT-labeled peptides which, in turn, allowed determination of the mass fraction of hTRF. The recovery ranged from 97 % to 105 % with a CV of 3.9 %. The LOD and LOQ were 1.71 × 10−5 g/g and 5.69 × 10−5 g/g of hTRF in human serum, respectively, and the relative expanded uncertainty was 4.7 % with a mass fraction of 2.08 mg/g. For comparison, an enzyme-linked immunosorbent assay (ELISA) method for hTRF yielded a mass fraction of 2.03 mg/g. This method provides a starting point for establishing IDMS technology to accurately determine the mass fractions of protein biomarkers in a matrix with traceability to SI units. This technology should support the development of a metrological method useful for quantification of a wide variety of proteins.
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Abbreviations
- ACN:
-
Acetonitrile
- CHCA:
-
(R)-cyano-4-hydroxycinnamic acid
- CID:
-
Collision-induced dissociation
- CRM:
-
Certified reference material
- CV:
-
Coefficient of variation
- ELISA:
-
Enzyme-linked immunosorbent assay
- HSA:
-
Human serum albumin
- hGH:
-
Human growth hormone
- hCG:
-
Human chorionic gonadotropin
- hTRF:
-
Human transferrin
- ICP-MS:
-
Inductively coupled plasma mass spectrometry
- IDMS:
-
Isotope dilution mass spectrometry
- LOD:
-
Limit of detection
- LOQ:
-
Limit of quantification
- MALDI-TOF-MS:
-
Matrix-assisted laser desorption ionization time-of-flight mass spectrometry
- SA:
-
Sinapinic acid
- SDS:
-
Sodium dodecyl sulfate
- SILAC:
-
Stable isotope labeling by amino acids in cell culture
- TEAB:
-
Triethylammonium bicarbonate
- TFA:
-
Trifluoroacetic acid
- TMTs:
-
Tandem mass tags
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Acknowledgments
This work is part of the project funded by the Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China (AQSIQ, grant no. 201310008) and National Institute of Metrology, China (NIM, grant no. AKY1413).
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Human serum samples were collected from the healthy volunteers after taking their written consent and the approval by the ethical committee of the institute.
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Li, J., Wu, L., Jin, Y. et al. A universal SI-traceable isotope dilution mass spectrometry method for protein quantitation in a matrix by tandem mass tag technology. Anal Bioanal Chem 408, 3485–3493 (2016). https://doi.org/10.1007/s00216-016-9424-0
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DOI: https://doi.org/10.1007/s00216-016-9424-0