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Study of complexes formation between transition metal ions and amylopectin in DMSO/H 2 O solution
Author(s) -
Peres Gisele Louro,
Leite Daiani Canabarro,
da Silveira Nadya Pesce
Publication year - 2016
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.201500364
Subject(s) - amylopectin , biopolymer , chemistry , metal ions in aqueous solution , metal , starch , inorganic chemistry , ion , factorial experiment , polymer , salt (chemistry) , yield (engineering) , organic chemistry , materials science , amylose , statistics , mathematics , metallurgy
The complexation ability of amylopectin (starch polymer) treated with ultrasound in DMSO/H 2 O solution was investigated with respect to several metal ions, with the assistance of a factorial design (experimental planning), in order to establish and optimize the best complexation conditions. Acetate, chloride, and nitrate were counter‐ions in the metal salts. The effects of temperature, time, and salt amount were evaluated during the complexation reactions using multivariate analysis, a set of mathematic methods capable of evaluating all system variables at once and, through this, temperature was found to be the most influential variable. Results for pH and conductivity provided evidence of complex formation between amylopectin and metal ions. In addition, small shifts in the vibrational frequency between the pure biopolymer and its metal complexes were detected using principal component analysis by interval (i‐PCA, a multivariate analysis method), supporting the formation of complexes. The complexes formed with Cu II and Cr III ions presented the best complexation yield (40.0 and 55.4%, respectively) with the biopolymer.