Synthesis of molecularly imprinted monolithic fibers for solid-phase microextraction of acetaldehyde from head-space of beverages stored in PET bottles

► We synthesize an acetaldehyde-imprinted monolithic fiber. ► It selectively extracts acetaldehyde from head-space of beverages stored in PET bottles. ► The fiber shows promising mechanical and thermal stability. ► The derivatization step is not necessary. Good linear range and long durability are t...

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Bibliographic Details
Published in:	Talanta (Oxford) Vol. 86; pp. 58 - 63
Main Authors:	Rajabi Khorrami, A., Narouenezhad, E.
Format:	Journal Article
Language:	English
Published:	Amsterdam Elsevier B.V 30-10-2011 Elsevier
Subjects:	Acetaldehyde Acetaldehyde - analysis Analytical chemistry Beverage Beverages - analysis Chemistry Chromatographic methods and physical methods associated with chromatography Exact sciences and technology Food Storage - instrumentation Gas chromatographic methods Indexing in process Methacrylates - chemical synthesis Molecular Imprinting - methods Molecularly imprinted Monolithic fiber Poly(ethylene terephthalate) Polyethylene Terephthalates - analysis Solid Phase Microextraction - methods Solid-phase microextraction Spectrometric and optical methods Solid-phase microextraction Monolithic fiber Beverage Molecularly imprinted Acetaldehyde Poly(ethylene terephthalate) Peak resolution Molecular structure Ethylene Microanalysis Glass Standard Replica method Mixture Chemical enrichment Molecules Sample preparation Detection limit Solvent Mold Trace analysis Sample Use Polymer Desorption Leaching Solid phase microextraction Gas chromatography Adsorption Template polymerization Syringe Headspace Parameter Molecular imprinting Mass spectrometry
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Summary:	► We synthesize an acetaldehyde-imprinted monolithic fiber. ► It selectively extracts acetaldehyde from head-space of beverages stored in PET bottles. ► The fiber shows promising mechanical and thermal stability. ► The derivatization step is not necessary. Good linear range and long durability are the other advantages. Molecularly imprinted monolithic fibers were synthesized and evaluated for solid-phase microextraction (SPME) of acetaldehyde from head-space of beverages stored in poly(ethylene terephthalate) (PET) bottles. The fibers were prepared by co-polymerization of methacrylic acid and ethylene glycole diethacrylate as functional monomer and cross-linker, respectively. Acetaldehyde was used as template molecule during polymerization process, in order to leave specific cavities after leaching off from the co-polymer. Narrow bore (i.d. 100μm) glass capillaries as molds were filled with polymerization mixture containing cross linker, functional monomer, template molecule, initiator and porogen solvent. This mixture is then polymerized to form a continuous porous monolith that conforms to the shape of the mold. The resulting monolithic fibers were employed by a micro-syringe to extract acetaldehyde from head-space of sample solutions. Gas chromatography/mass spectrometry (GC/MS) was used to analyze adsorbed acetaldehyde to the fibers. Parameters influencing adsorption of acetaldehyde from head-space of standard solutions to the fiber and subsequently desorption in the GC chamber were optimized. The limit of detection (LOD) and the limit of quantification (LOQ) were 0.01 and 0.03μgmL−1, respectively. The intra-day and inter-day precisions of the peak areas for five replicates were 8 and 15%, respectively.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2
ISSN:	0039-9140 1873-3573
DOI:	10.1016/j.talanta.2011.08.002