Journal
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
Volume 31, Issue 4, Pages 917-926Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jasms.9b00102
Keywords
matrix-assisted laser desorption/ionization time-of-flight mass spectrometry; parylene-matrix chip; cancer biomarker; N-methyl-2-pyridone-5-carboxamide; glutamine; lysophosphatidylcholine
Funding
- Ministry of Trade, Industry and Energy (MOTIE, Korea)
- Industry Technology Development Program [10063335]
- National Research Foundation of Korea [NRF-2020R1A2B5B01002187]
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Recently, the parylene-matrix chip was developed for quantitative analysis of small molecules less than 1 kDa. In this study, MALDI-TOF MS based on the parylene-matrix chip was performed to clinically diagnose intrahepatic cholangiocarcinoma (IHCC) and colorectal cancer (CRC). The parylene-matrix chip was applied for the detection of small cancer biomarkers, including N-methyl-2-pyridone-5-carboxamide (2PY), glutamine, lysophosphatidylcholine (LPC) 16:0, and LPC 18:0. The feasibility of MALDI-TOF MS based on the parylene-matrix chip was confirmed via analysis of spot-to-spot and shot-to-shot reproducibility. Serum metabolite markers of IHCC, N-methyl-2-pyridone-5-carboxamide (2PY), and glutamine were quantified using MALDI-TOF MS based on the parylene-matrix chip. For clinical diagnosis of CRC, two water-insoluble (barely soluble) biomarkers, lysophosphatidylcholine (LPC) 16:0 and LPC 18:0, were quantified. Finally, glutamine and LPC 16:0 were simultaneously detected at a range of concentrations in sera from colon cancer patients using the parylene-matrix chip. Thus, this method yielded highthroughput detection of cancer biomarkers for the mixture samples of water-soluble analytes (2PY and glutamine) and waterinsoluble analytes (LPC 16:0 and LPC 18:0).
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