2-S-Glutathionyl caftaric acid
3D model (JSmol)
|Molar mass||617.54 g·mol−1|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
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.
Determining its concentration in wine is possible by mass spectrometry.