Some green
fruits and bananas contain a very small amount of starch, but on the
whole the carbohydrate of fruits is in the form of sugar and is in
solution in the fruit juices. The chief form of this carbohydrate is
known as _levulose_, or _fruit sugar_. However, _glucose_, another form
of sugar, is also found in nearly all fruits, grapes and dried fruits,
such as figs, raisins, etc., containing an unusually large amount. In
addition, _cane sugar_ is contained in the majority of fruits. _Pectin_
is also a carbohydrate that is found in large quantities in some fruits,
while in other fruits it is lacking. This substance is related to the
gums and to cellulose. Although it is one of the carbohydrates from
which no food value is derived, it is of considerable importance,
because it is responsible for the jelly-making properties of fruits.
14. In fruits that are not fully matured, or, in other words, green
fruits, the sugar has not developed to so great an extent as it has in
perfectly ripe fruits. Consequently, such fruits are not so high in food
value as they are when they become ripe. As is well known, it is the
sugar of fruits that accounts for their sweet taste, for the sweeter the
fruits, the more sugar and the less acid they contain.
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