In fact, any method that results in a loss of minerals is
not a good one to adopt in the preparation of fruits.
The minerals commonly found in fruits are iron, lime, sodium, magnesium,
potash, and phosphorus. These are in solution in the fruit juices to a
very great extent, and when the juices are extracted the minerals
remain in them.
17. Acids in Fruit.--Some fruits contain only a small amount of acid,
while others contain larger quantities. It is these acids, together with
the sugar and the volatile oils of fruits, that constitute the entire
flavor of this food. Most ripe fruits contain less acid than unripe
ones, and cooked fruits are often higher in acid than the same
fruits when raw.
Numerous kinds of acid are found in the different varieties of fruits.
For example, lemons, oranges, grapefruit, and a few other fruits
belonging to the class known as citrus fruits contain _citric acid_;
peaches, plums, apricots, and apples, _malic acid_; and grapes and many
other fruits, _tartaric acid_.
TABLE I
COMPOSITION AND FOOD VALUE OF FRUITS
| | | | | |Food Value
Fruit |Water|Protein| Fat |Carbo- |Mineral|per Pound,
| | | |hydrate|Matter |in Calories
------------------+-----+-------+-----+-------+-------+-----------
| | | | | |
Apples, fresh |84.
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