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Zhenjiang fragrant vinegar (Kozu) is a black rice vinegar that has been used as a traditional Chinese medicine and has various health benefits, including anti-obesity effects. In the present study, using luciferase reporter assays of PPARγ promoter activity, a novel ingredient from 8-year-old Kozu, 5-hydroxy-4-phenyl-butenolide, was isolated. The newly found agonist was named as "Fraglide-1". Moreover, in subsequent experiments, it was confirmed that fraglide-1 was an PPARγ agonist and it could increase expression level of the uncoupling protein (UCP)-1. Fraglide-1 was chemically synthesized and it was verified that expression of the PPARγ was increased in dose dependent manner. Although Kozu has been consumed globally as a functional food for thousands of years, the mechanisms behind its health effects have not been characterized. The active ingredient of Kozu was successfully found and the results unraveled a longtime mystery about Kozu for its beneficial health effect.

journal of oleo science

A New Agonist for Peroxisome Proliferation-activated Receptor γ (PPARγ), Fraglide-1 from Zhenjiang Fragrant Vinegar: Screening and Characterization Based on Cell Culture Experiments