Removal of patulin from aqueous solutions by propylthiol functionalized SBA-15

JOURNAL OF HAZARDOUS MATERIALS

卷:187

Article

Appell, Michael¹  Jackson, Michael A.²  Dombrink-Kurtzman, Mary Ann² 

[1] ARS, Bacterial Foodborne Pathogens & Mycol Res Unit, USDA, Natl Ctr Agr Utilizat Res, Peoria, IL 61604 USA

[2] ARS, Renewable Prod Technol Res Unit, USDA, Natl Ctr Agr Utilizat Res, Peoria, IL 61604 USA

关键词: Detoxification;    SBA-15;    Molecular Modeling;    Mycotoxin;    Patulin;   

DOI  :  10.1016/j.jhazmat.2011.01.002

来源: Elsevier

【 摘 要 】

Propylthiol functionalized SBA-15 silica was investigated to detoxify aqueous solutions contaminated with the regulated mycotoxin patulin. Micelle templated silicas with a specific pore size were synthetically modified to possess propylthiol groups, a functional group known to form Michael reaction products with the conjugated double bond system of patulin. BET surface area analysis indicated the propylthiol functionalized SBA-15 possesses channels with the pore size of 5.4 nm and a surface area of 345 m(2) g(-1). Elemental analysis indicates the silicon/sulfur ratio to be 10:1, inferring one propylthiol substituent for every ten silica residues. The propylthiol modified SBA-15 was effective at significantly reducing high levels of patulin from aqueous solutions (pH 7.0) in batch sorption assays at room temperature. The material was less effective at lower pH; however heating low pH solutions and apple juice to 60 degrees C in the presence of propylthiol functionalized SBA-15 significantly reduced the levels of patulin in contaminated samples. Composite molecular models developed by semi-empirical PM3 and empirical force field methods support patulin permeation through the mesoporous channels of propylthiol functionalized SBA-15. Density functional study at the B3LYP/6-31G(d,p) level predicts the proposed patulin adducts formed by reaction with the thiol residues exhibit less electrophilic properties than patulin. It is demonstrated the use of propylthiol functionalized SBA-15 is a viable approach to reduce patulin levels in aqueous solutions, including contaminated apple juice. Published by Elsevier B.V.

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