STUDIES ON REMOVAL OF UNDESIRABLE PIGMENTS FROM DISCOLOURED SORGHUM BY CHEMICAL TREATMENTS
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Date
1996
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Mahatma Phule Krishi Vidyapeeth, Rahuri.
Abstract
The investigations were carried out to standardise
a chemical dehulling treatment to remove a black to brown
discolouration of sorghum grains often obtained in khanf
season, to improve their acceptability and utilisation. The
discoloured grains of different cultivars were obtained from
the Sorghum Breeder of this University and subjected to
alkaline extraction using different concentration of alkali,
extraction temperatures, and extraction periods, followed by
washing, neutralisation and drying of the grains. The dehulled
grains were analysed for changes m nutritional composition
and evaluated for their roti making quality.
Extraction of the grains in 4 per cent NaOH (1:1
W/V) at 100°C for 5 mm followed by washing under water,
neutralisation of the residual alkali with 1 per cent acetic acid for 5 min, rewashing of the grains followed by drying at
50 to 60 °C to constant weight was found to be effective for
the complete removal of discoloured bran. The treatment
produced white grains without any breakage.
The chemical dehulling treatment was found to cause
about 15 per cent loss in dry matter, a significant increase
in grain protein while a reduction in crude fiber, ash,
phenolics and sugars.
Dehulling of the discoloured grains did not
influence dough rollability or extent of moisture loss in rotj_
during ambient storage. The dehulling of grains significantly
improved the colour and appearance of the roti. However the
loss in sugars caused a decrease in sweetness of the product.
A supplementation of the meal with table sugar may be
necessary to maintain the sweetness of the roti. Further
investigations are essential to economise the dehulling
process and minimise the losses in sugars of the grains.
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