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Brazil nut:- It contain sufficient amount of barium to
cause poisoning. The kernel of brazilian nut on the air-dry basis
contains 0.26% barium. Extraction of the nut - meat with water
acidified with hydrochloric acid removes all the barium.
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Some times physiological changes also cause the formation of
poisonous substances in oil seeds.
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Rhubarb and spinach contain oxalic acid, which bind with
calcium so it creates calcium deficiency.
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The oil-seeds contain anti-nutritional and toxic factors that
must be inactivated if their full value to be realised.
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Oxalate found in Sesame oil. Oxalic acid forms insoluble salts
with calcium, magnesium and iron, and act to prevent these minerals
from being absorbed during digestion.
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Phytic acid present in cereals:- It is scientifically is
Inositol hexaphosphonic acid. It is a phosphoric acid ester of
magnesium salt is called phytin. Phytic acid forms insoluble salts
with calcium, iron and magnesium, it interferes with the intestinal
absorption of these minerals. Phytic acid is associated with fibre.
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Phytes also results into decrease iron and zinc absorption.
Cereals contain Phytin, its bind with calcium so cause calcium
deficiency
Cotton seeds endosperm
has pigment glands which contain the toxic pigment gossypol. The
gossypol that gets into the oil is removed during oil refining.
Gossypol that stay with the meal has problem accepting cotton seed
flour and cotton seed protein for human food. It is possible to remove
un -ruptured pigment glands by controlled disintegration of the seed
in the hexane and centrifugal separation of lighter glands form the
rest of endosperm. Glandless varieties of cotton seeds are free of
gossypol have been developed by plant breeder.
Some molds produce poisonous called
mycotoxin. The mycotoxin aflatoxin found in ground nut. If eaten, it
can cause severe and some times deadly liver damage.
Aflatoxin-producing molds grow under warm, moist conditions, care is
needed to store these food. |
