Tags: Chemical Compound, Chemical Substance.
The grape reaction product (GRP GRP1 or 2-S-glutathionyl caftaric acid) is a phenolic compound explaining the disappearance of caftaric acid from grape must during processing. It is also found in aged red wines. Its enzymatic production by polyphenol oxidase is important in limiting the browning of musts especially in white wine production. The product can be recreated in model solutions.S-Glutathionyl caftaric acid is itself oxidizable.
