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KMID : 0380020070220040260
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Korean Journal of Biotechnology and Bioengineering
2007 Volume.22 No. 4 p.260 ~ p.264
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Surface Modification of Glass Chip for Peptide Microarray
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Cho Hyung-Min
Im Chang-Hwan
Lee Eun-Kyu
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Abstract
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Peptides are frequently studied as candidates for new drug development. Recently, synthesized peptide library is screened for a certain functionality on a microarray biochip format. In this study, in order to replace the conventional cellulose membrane with glass for a microarray chip substrate for peptide library screening, we modified the glass surface from amines to thiols and covalently immobilized the peptides. Using trypsin-FITC (fluorescein isothiocyanate) conjugate that could specifically bind to a trypsin binding domain consisting of a 7-amino acid peptide, we checked the degree of surface modification. Because of the relatively lower hydrophilicity and reduced surface roughness, the conjugation reaction to the glass required a longer reaction time and a higher temperature. It took approximately 12 hr for the reaction to be completed. From the fluorescence signal intensity, we could differentiate between the target and the control peptides. This difference was confirmed by a separate experiment using QCM. Furthermore, a smaller volume and higher concentration of a spot showed a higher fluorescence intensity. These data would provide the basic conditions for the development of microarray peptide biochips.
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KEYWORD
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Peptide library, immobilization, surface modification, microarray, peptide screening
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