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p-Phenylenediamine (PPD) is an organic compound with the formula C 6 H 4 (NH 2) 2. This derivative of aniline is a white solid, but samples can darken due to air oxidation. [1] It is mainly used as a component of engineering polymers and composites like kevlar. It is also an ingredient in hair dyes and is occasionally used as a substitute for ...
Wine is a complex mixture of chemical compounds in a hydro-alcoholic solution with a pH around 4. The chemistry of wine and its resultant quality depend on achieving a balance between three aspects of the berries used to make the wine: their sugar content, acidity and the presence of secondary compounds.
Phenolic compounds found in wine that may contribute to off odors and flavors that are considered wine faults. The most common types of volatile phenols found in wine are ethyl and vinyl phenols . To a limited degree some volatile phenols may contribute pleasing aromas that add to a wine's complexity, such as ethyl-4-guaiacol which imparts a ...
Phenylenediamine may refer to: o-phenylenediamine or OPD, a chemical compound C 6 H 4 (NH 2) 2; m-phenylenediamine or MPD, a chemical compound C 6 H 4 (NH 2) 2;
Tannins are found in the skin, stems, and seeds of wine grapes but can also be introduced to the wine through the use of oak barrels and chips or with the addition of tannin powder. The natural tannins found in grapes are known as proanthocyanidins due to their ability to release red anthocyanin pigments when they are heated in an acidic ...
A 2024 study found that drinking red wine may significantly decrease certain markers of inflammation related to atherosclerosis—plaque buildup on the artery walls. Interestingly, this was true ...
Malic and tartaric acid are the primary acids in wine grapes. The acids in wine are an important component in both winemaking and the finished product of wine. They are present in both grapes and wine, having direct influences on the color, balance and taste of the wine as well as the growth and vitality of yeast during fermentation and protecting the wine from bacteria.
A place where grape vines are grown for wine making purposes. Vintage The year in which a particular wine's grapes were harvested. When a vintage year is indicated on a label, it signifies that all the grapes used to make the wine in the bottle were harvested in that year. Viticulture The cultivation of grapes. Not to be confused with viniculture.