Proteomic profiling of platelet proteins by trypsin immobilized self-assembled monolayers digestion chip and protein identification using electrospray ionization tandem mass spectrometry

Yu Chang Tyan, Jiunn Der Liao, Shiang Bin Jong, Pao Chi Liao, Ming Hui Yang, Yin Wei Chang, Ruth Klauser, Michael Himmelhaus, Michael Grunze

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Self-assembled monolayers (SAMs) on coinage metal provide versatile modeling systems for studies of interfacial electron transfer, biological interactions, molecular recognition, and other interfacial phenomena. Recently, the bonding of enzyme to SAMs of alkanethiols onto Au electrode surfaces was exploited to produce a bio-sensing system. In this work, the attachment of trypsin to a SAMs surface of 11-mercaptoundecanoic acid was achieved using water soluble 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide and N- hydroxysulfosuccinimide as coupling agent. Experimental results have revealed that the X-ray Photoelectron Spectroscopy (XPS) Cls core levels at 286.3 and 286.5 eV (C with N), 288.1 eV (amide bond), and 289.3 eV (carboxyl) illustrate the immobilization of trypsin. These data were also in good agreement with Fourier-Transformed Infrared Reflection-Attenuated Total Reflection (FTIR-ATR) spectra for the peaks valued at 1659.4 cm-1 (amide I) and 1546.6 cm-1 (amide II). Using electrospray ionization tandem mass spectrometry (ESI-MS/MS) observations, analytical results have demonstrated the platelet proteins digestion of the immobilized trypsin on the functionalized SAMs surface. For such surfaces, platelet proteins were digested on the trypsin-immobilized SAMs surface, which shows the enzyme digestion ability of the immobilized trypsin. The terminal groups of the SAMs structure can be further functionalized with biomolecules or antibodies to develop surface-base diagnostics, biosensors, or biomaterials.

Original languageEnglish
Pages (from-to)90-97
Number of pages8
JournalJournal of Biomedical Materials Research - Part A
Volume71
Issue number1
DOIs
Publication statusPublished - 2004 Oct 1

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Biomaterials
  • Biomedical Engineering
  • Metals and Alloys

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