Log-scale dose response of inhibitors on a chip.

Jae Young Yun, Sachin Jambovane, Se-Kwon Kim, Sung-Hak Cho, Evert C Duin, Jong Wook Hong

Index: Anal. Chem. 83(16) , 6148-53, (2011)

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Abstract

We demonstrate the accommodation of log-scale concentration gradients of inhibitors on a single microfluidic chip with a semidirect dilution capability of reagents for the determination of the half-inhibitory concentration or IC(50). The chip provides a unique tool for hosting a wide-range of concentration gradient for studies that require an equal distribution of measuring points on a logarithmic scale. Using Matrix metalloproteinase IX and three of its inhibitors, marimastat, batimastat, and CP471474, we evaluated the IC(50) of each inhibitor with a single experiment. The present work could be applied to the systematic study of biochemical binding and inhibition processes particularly in the field of mechanistic enzymology and the pharmaceutical industry.