Composition of must
- water : this is the principle element, in the order of 700-830 g/L
- sugars : on average, there are 150 g/L (not particularly ripe grapes) to 280 g/l and even higher glucose and fructose (G/F = 0.9-1.1 ) arabonose & rhamnose also present.
- organic acids : depending on the degree of ripeness, these rang from the 12-15 G/l of not very ripe grape (With a probable prevalence of malic acid ) to 5-6 g/l in very ripe grapes (with a prevalence of tartaric acid)
- polyphenolic substances : these are made up of flavonoids, ( anthocyanins, annins) and non-flovonoids (phenolic acids, volatile phenols)
- pectic substance : pectina, pectic acid, gums , eta., in the oder of 0.2-2g/l
- nitrogenous substance : fundamental in the subsrquent atage of fermentation, these aer made up of ammoniacal nitrogen, amines