Synthesis and evaluation of hydroxypropylated potato starch as polymeric support for benzo[a]pyrene degradation by Fenton reaction

In order to perform an efficient Fenton reaction of benzo[a]pyrene (BaP) in the presence of starch as a reaction matrix, a computer modeling study conducted on amylopectin as a component of potato starch allows to identify three more stable sites, among six, available for BaP and iron complexation....

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Bibliographic Details
Published in:Carbohydrate polymers 2011-02, Vol.83 (4), p.1486-1491
Main Authors: Rosu, Ana-Maria, Veignie, Etienne, Surpateanu, Gheorghe, Brabie, Gheorghe, Miron, Doru Neculai, Rafin, Catherine
Format: Article
Language:English
Subjects:
Applied sciences
Benzo[a]pyrene
Decontamination. Miscellaneous
Exact sciences and technology
Fenton reaction
Hydroxypropyl starch
Life Sciences
Natural polymers
Physicochemistry of polymers
Pollution
Soil and sediments pollution
Starch and polysaccharides
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Summary:In order to perform an efficient Fenton reaction of benzo[a]pyrene (BaP) in the presence of starch as a reaction matrix, a computer modeling study conducted on amylopectin as a component of potato starch allows to identify three more stable sites, among six, available for BaP and iron complexation. For the purpose of enabling the formation of such a stable complex, starch was irreversibly modified by hydroxypropylation for favoring the accessibility of BaP to available complexation sites. The results show that such an irreversible modification significantly consequently increased starch solubilization in cold water. Hydroxypropyl starch derivative obtained in the optimized synthesis conditions (molar substitution of 0.73) increased significantly the BaP solubility and consequently influenced its degradation (38%) by Fenton oxidation. We might hypothesize that starch depolymerisation occurring through a radical chain mechanism during the Fenton reaction allows the formation of carbon centred radicals, permitting therefore an oxidation attack of BaP.
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2010.09.059