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Succinylation in Aqueous Medium



Starch is weighed out into a beaker and distilled water is added to achieve a concentration of 40% (w/v). The starch suspension is stirred using a mechanical stirrer in order to make it into a uniform slurry. The pH of the slurry is adjusted using calomel electrodes by adding drop wise a 3% solution of sodium hydroxide. To this slurry, weighed quantity of succinic anhydride is added in small portions while simultaneously adding sodium hydroxide solution in order to maintain the pH of the medium at the desired level. Stirring is continued for the required time duration. After the reaction is over, the pH of the medium containing the product is adjusted to 6.5 using hydrochloric acid (0.5N). The product is recovered by vacuum filtration, washed with water and re-filtered. The washing is repeated thrice, dried overnight at 55°C in an air oven and powdered.


Central Tuber Crops Research Institute
Sreekariyam, Thiruvananthapuram, Kerala - 17