Definition - What does Polyvinylpolypyrrolidone (PVPP) mean?
Polyvinylpolypyrrolidone, or PVPP, is a polymer (a substance of synthetic organic materials utilized as a resin or plastic) sometimes chosen as a fining agent in wine. It has the ability to absorb the polyphenols that precipitate from the wine, which are responsible for the browning of wines and the bitter components it may contain.
WineFrog explains Polyvinylpolypyrrolidone (PVPP)
Polyvinylpolypyrolidone (PVPP) is an agent used to fine wines before their final bottling stage. While there are many fining agents for different purposes, PVPP is one which is most commonly used for some full-bodied red wines. These types of wines often have naturally-occuring polyphenols, which can cause excessive bitterness in the texture and flavor of a wine and lead to its premature browning.
By adding Polyvinylpolypyrolidone powder in recommended dosages of 25-75 grams per hectoliter of wine, it will absorb such compounds and precipitate from the wine within one to two hours.