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Measurement of Some Physico‐chemical Properties of Starches by the Adsorption of Acid and Basic Dyes
Author(s) -
Badenhuizen N. P.
Publication year - 1977
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.19770290402
Subject(s) - acridine orange , chemistry , starch , defatting , adsorption , swelling , orange (colour) , erythrosine , nuclear chemistry , organic chemistry , food science , chemical engineering , biochemistry , apoptosis , engineering
The relative number of positive and negative charges in starch granules of different species and varieties of plants and after various treatments was investigated by measuring the adsorption of erythrosine B (acid dye) and acridine orange (basic dye). The results showed a high negative correlation. It is assumed that the positive charges are represented by free OH‐groups, the negative charges by H‐bonds and that basically each starch type is characterized by a certain proportion between the two. The samples investigated showed a clear distinction between A‐ and B‐starches, with positivity increasing from the B‐ to the A‐starches and culminating in the waxy types. Positivity was enhanced in laboratory‐isolated samples over their commercial counterparts, and increased during swelling and after defatting.