COMPOSITION OF GRAPE Analytical studies conducted have successfully characterized the physical and chemical compositions of grape. It was reported that every single part of grape contains different composition and constituent. 1. Physical Composition The essential parts of the grape are skin, pulp and seeds. The skin is an outer layer that cover the grape. It is made up of six to ten layers of thick walled cells. The outer surface of the skin (epidermis) is covered with a wax-like coating called the cuticle, which renders the grape to become waterproof and also as a protection against injury. The main components found in the skin are potassium, aromatic substances, tannins, coloring matter which is red and yellow pigments and other minerals. The largest part or grape are called flesh or pulp. They lie beneath the skin layer and make up most of the volume of the grape. It is the soft tissue of the grape which made up of fragile cells with very thin cell walls that have large vacuoles …show more content…
The acids found in grapes are tartaric, malic and low level of citric, ascorbic and acetic. These are called ‘organic acids’ because they contain carbon atoms. Many other organic acids, including amino acids, are also found in juice and wines, but tartaric and malic acid account for over 90% of the total acids present. During the early period of berry growth, concentration of both acids increases in the fruit. With the onset of ripening, as the sugar accumulates in the fruit, the acid concentration decreases. Generally, the reduction in malic acid is greater, and consequently, at maturity, the fruit contains more tartaric acid. Grapes are one of the rare fruits that contain tartaric acid. It is present as free acid and a salt, such as potassium bitartrate. Bitartrate is an important constituent since it affects pH and the cold stability of the