Study of quantitative interactions of potato and corn starch granules with ions in diluted solutions of heavy metal salts

被引:28
|
作者
Szymonska, Joanna [1 ]
Molenda, Marcin [2 ]
Wieczorek, Jerzy [3 ]
机构
[1] Univ Agr, Dept Chem & Phys, PL-30149 Krakow, Poland
[2] Jagiellonian Univ, Fac Chem, PL-30060 Krakow, Poland
[3] Univ Agr, Dept Agr Chem, PL-30120 Krakow, Poland
关键词
Metal ion biosorption; Ion distribution in starch; Starch oxidation; Bioelements in foods; RHEOLOGICAL PROPERTIES; AQUEOUS-SOLUTION; GELATINIZATION; COMPLEXES; HYDRATION; CATIONS; BIOSORPTION; PHOSPHATE; SURFACE; LIPIDS;
D O I
10.1016/j.carbpol.2015.07.041
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Interactions of potato and corn starch granules with ions in diluted solutions of silver, lead, copper or iron salts were investigated. It was shown experimentally that granules accumulated the cations in amounts depending on the granule structure and water content as well as a type of both metal and counter-ions present in solution. Potato starch retained almost three times more cations compared to corn starch what was proportional to the total phosphorous content in these starches. Quantity of milligrams of cations bound by 1 g of starch was inversely correlated with the cation hydration. Ag+, Pb2+ and Cu2+ were connected in stoichiometric amounts of moles to semicrystalline and amorphous parts of the granules. Fe3+ ions were accumulated in higher than stoichiometric quantities mainly in granule amorphous regions. Metal ions penetrated into granules together with anions except nitrates which remained on surface of potato starch granules. Cations facilitated the starch thermal decomposition in accordance with values of their standard redox potentials. Nitrates supported this process only in the presence of base metal cations. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码:102 / 109
页数:8
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