Ketchup: Methods of Manufacture; Microscopic ExaminationBitting, K. G. (Katherine Golden)
Science
Ketchup: Methods of Manufacture; Microscopic Examination
Bitting, K. G. (Katherine Golden)
Ketchup
tomatoes for canning, as the treatment is too rough. If the tomatoes are
soft or badly cracked, it causes considerable loss, but not of material
that should be used in ketchup. The strong sprays will also cut off
adherent mold and soft rot. A thoroughly good washer will do about
nine-tenths of the work for the inspectors. During the past season some
modifications have been made of this washer in the east. The machine has
been enlarged, but better results would be obtained by using a greater
number of small ones. Again, some washing machines have been
ineffective, not on account of any defect, but because of over-speeding.
The vigor with which the washing is done is always apparent in the
finished product. The poor washing usually given to tomatoes for
canning, accounts in a measure for the relatively large numbers of
organisms found in ketchup made from trimmings.
PULPING.
After washing, the tomatoes may be reduced to a pulp in one of three
ways: by running the raw tomatoes directly through a grinder and into
the cyclone; by passing the tomatoes through a scalder and into the
cyclone; and by turning the tomatoes into jacketed-kettles or tanks and
cooking them until soft before running through the cyclone. There is a
difference in the product obtained by these methods. The first one gives
a somewhat larger yield, as the hard parts are cut and torn so that more
will be squeezed through the sieve. The color is generally stronger and
inclined to the purple side rather than the yellow. The color, however,
does not hold so well when exposed to light. The pulp inclines to froth
and there is a marked separation of red pigment on the top. A raw pulp
will begin to separate into a clear layer below and solids at the top in
about fifteen to twenty minutes after standing in a tank. This is due to
the air incorporated in the solids and possibly to difference in
specific gravity, and not to fermentation, as frequently alleged.
Changes will take place more rapidly in such pulp than in that made from
scalded fruit.
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