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    Pressurized hot water extraction coupled to molecularly imprinted polymers for simultaneous extraction and clean-up of pesticides residues in edible and medicinal plants of the Okavango Delta, Botswana

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    Mokgadi_ MOI_2013.pdf (468.2Kb)
    Date
    2013-10-08
    Author
    Mokgadi, Janes
    Batlokwa, Shima
    Mosepele, Keta
    Obuseng, Veronica
    Torto, Nelson
    Publisher
    De Gruyter, http://www.degruyter.com/
    Link
    http://www.degruyter.com/view/j/molim.2012.1.issue/molim-2013-0003/molim-2013-0003.xml
    Rights
    This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivs license,(http://creativecommons.org/licenses/by-nc-nd/3.0/), which means that the text may be used for non-commercial purposes, provided credit is given to the author.
    Type
    Published Article
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    Abstract
    In this study, an in-cell extraction and clean-up approach, employing pressurized hot water extraction (PHWE) coupled to a molecularly imprinted polymer (MIP) is proposed. The selectivity of PHWE was improved through the use of a chlorophyll MIP (PHWE-MIP) for the determination of organochlorine pesticides residue levels in various edible and medicinal plants of the Okavango Delta, Botswana. The PHWE-MIP method achieved simultaneous extraction and clean-up. PHWE employed an optimal temperature of 260 °C, pressure of 90 bar and flow rate of 1 mL min-1 in 10 min for the extraction of the pesticides from plants while the MIP selectively overcame the interfering chlorophyll prior to analysis with gas chromatograph coupled to electron capture detector or mass spectrometer (GC-ECD/MS). The results obtained were compared to the QuEChERS Official Method 2007:01 for pesticides residue analysis. The proposed method seems to be nearly fully automated, environmental friendly, selective, simple and quick. Moreover, the recoveries of planar pesticides were improved (93-95%) with relative standard deviations (%RSD) of less than 10%.
    URI
    http://hdl.handle.net/10311/1350
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    • Research articles (ORI) [270]

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