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Adsorption of Methyl Orange on Starches
Author(s) -
BOKI K.,
IMAI T.,
OHNO S.
Publication year - 1991
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1991.tb07982.x
Subject(s) - adsorption , chemistry , freundlich equation , starch , methyl orange , langmuir , orange (colour) , corn starch , potato starch , polysaccharide , amylose , food science , organic chemistry , nuclear chemistry , photocatalysis , catalysis
Adsorption characteristics of methyl orange were investigated on kudzu, sweet potato, corn, rice, wheat, potato and snake gourd starches. No adsorption of methyl orange, an anionic dye, was observed on potato starch and snake gourd starch because of the presence of phosphate esters. Adsorption isotherms were found to fit both the Langmuir equation and Freundlich equation in all others. The degree of adsorption by kudzu, sweet potato, corn and wheat starches was related to the number of hydroxyl groups. We suggested methyl orange was confined to a monolayer on surface hydroxyl groups of the starches.