Archives of Pharmacal Research

The Pharmaceutical Society of Korea (대한약학회)
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Determination of the Kinetic Properties of Platycodin D for the Inhibition of Pancreatic Lipase Using a 1,2-Diglyceride-Based Colorimetric Assay

  • Zhao, Hai Lin (Natural Products Research Institute, College of Pharmacy, Seoul National University) ;
  • Kim , Yeong-Shik (Natural Products Research Institute, College of Pharmacy, Seoul National University)
  • Published : 2004.01.01
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Abstract

A 1, 2-diglyceride-based multi-step colorimetric assay to measure the pancreatic lipase activity was applied for the determination of the kinetic profiles of the lipase inhibition with a slight modification and the validity verification. With this assay method, our study revealed that platycodin D, one of major constituents of Platycodi Radix, inhibits the pancreatic lipase activity in a competitive type, with the value of $K_I$ being 0.18${\pm}$0.02 mM. In addition, PD has affected the values of $K_{m,app}\;and\;K_{cat}/K_m$ in a dose- dependent manner. The results shed a meaningful light on how PD mediates lipid metabolism in the intestinal tracts. On the other hand, since the revised assay is sensitive, rapid, and does not affect the accuracy to the kinetic properties, it is applicable not only to evaluation of the kinetic properties of the pancreatic lipase, but also to highthroughput screening of pancreatic lipase activity.

Keywords

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