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Int. J. Mol. Sci. 2017, 18(4), 801; doi:10.3390/ijms18040801

Large-Scale Membrane- and Lignin-Modified Adsorbent-Assisted Extraction and Preconcentration of Triazine Analogs and Aflatoxins

Department of Applied Chemistry, National Chiayi University, Chiayi 600, Taiwan
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Academic Editors: Araceli García, Luis Serrano and Vladimír Křen
Received: 23 February 2017 / Revised: 27 March 2017 / Accepted: 30 March 2017 / Published: 11 April 2017
(This article belongs to the Special Issue The Lignin Challenge: Exploring Innovative Applications)
View Full-Text   |   Download PDF [5174 KB, uploaded 11 April 2017]   |  

Abstract

The large-scale simultaneous extraction and concentration of aqueous solutions of triazine analogs, and aflatoxins, through a hydrocarbon-based membrane (e.g., polyethylene, polyethylene/polypropylene copolymer) under ambient temperature and atmospheric pressure is reported. The subsequent adsorption of analyte in the extraction chamber over the lignin-modified silica gel facilitates the process by reducing the operating time. The maximum adsorption capacity values for triazine analogs and aflatoxins are mainly adsorption mechanism-dependent and were calculated to be 0.432 and 0.297 mg/10 mg, respectively. The permeation, and therefore the percentage of analyte extracted, ranges from 1% to almost 100%, and varies among the solvents examined. It is considered to be vapor pressure- and chemical polarity-dependent, and is thus highly affected by the nature and thickness of the membrane, the discrepancy in the solubility values of the analyte between the two liquid phases, and the amount of adsorbent used in the process. A dependence on the size of the analyte was observed in the adsorption capacity measurement, but not in the extraction process. The theoretical interaction simulation and FTIR data show that the planar aflatoxin molecule releases much more energy when facing toward the membrane molecule when approaching it, and the mechanism leading to the adsorption. View Full-Text
Keywords: extraction; preconcentration; lignin-modified adsorbent; adsorption; triazine analog; membrane; aflatoxin extraction; preconcentration; lignin-modified adsorbent; adsorption; triazine analog; membrane; aflatoxin
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Hu, S.-W.; Chen, S. Large-Scale Membrane- and Lignin-Modified Adsorbent-Assisted Extraction and Preconcentration of Triazine Analogs and Aflatoxins. Int. J. Mol. Sci. 2017, 18, 801.

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