4.4 Article

Effect of low-molecular additives on precipitation of potato fruit juice proteins under different temperature regimes

Journal

JOURNAL OF FOOD PROCESS ENGINEERING
Volume 31, Issue 4, Pages 533-547

Publisher

WILEY
DOI: 10.1111/j.1745-4530.2007.00167.x

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The effects of two mineral and two organic acids, four organic solvents (methanol, ethanol, 2-propano and acetone) and three inorganic metal salts in combination with temperature regimes 0 and 22C on the yield and resolubility of potato tuber proteins were studied. Using acids, the yield of precipitated protein ranged from 22.3% (citric acid, 0C) to 54.5% (acetic acid, 22C) of total protein; however the resolubility was generally very low. The precipitation. with organic solvents resulted in significantly higher yield as well as resolubility (P < 0.05) when precipitated at low temperatures. The yield ranged from 23.4% (ethanol, 22C) to 64.5% (2-propanol, 0C) of total protein. The use of the salts resulted in precipitates with, high resolubility regardless of the temperature regimes. The yield of precipitated protein ranged from 25.8% (ZnCl2, 0C) to 86.4% (FeCl3, 0C) of total protein.

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