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Role of Different Bleaching Earths for Sunflower Oil in a Pilot Plant Bleaching System
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Publication date: 2013-09-30
Pol. J. Food Nutr. Sci. 2013;63(3):147-154
The purpose of present study is to investigate the efficiency of different kinds of Turkish commercial bleaching earth materials for changes in different color pigment concentrations in neutralized sunflower oils. The bleaching experiments were performed in a pilot system under at stable vacuum (50 mmHg) and temperature (100ºC) for 30 min. By examining the changes in chlorophyll, β-carotene and red color, bleaching process parameters such as type and dosage of the bleaching material were optimized. The sorption characteristics of color pigments were evaluated using common adsorption isotherms and Scatchard plot analysis. Ads-3 acid-activated earth material at 1% (w/w) per samples was found to be the most appropriate sorbent and the amount of sorbed pigments was calculated as 1.01x10-4 mmol/g ads. for chlorophyll, 1.15x10-3 mmol/g ads. for carotene and 1.70 red on Lovibond color scale. The procedure indicated that this system can be easily adapted to the actual oil refining systems.
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