STUDIES ON REMOVAL OF UNDESIRABLE PIGMENTS FROM DISCOLOURED SORGHUM BY CHEMICAL TREATMENTS

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Date
1997
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MAHATMA PHULE KRISHI VIDYAPEETH RAHURI, DIST. AHMEDNAGAR, MAHARASHTRA, (INDIA)
Abstract
The investigations were carried out to standardize 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 m m followed by washing under water, neutralisation of the residual alkali with 1 per cent acetic XI 1 Abstract contd... . Darade N.B. 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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Agricultural Biochemistry
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