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Evaluation of polycaprolactone as a new sorbent coating for determination of polar organic compounds in water samples using membrane-SPME.

Marcinkowski Ł, Kloskowski A, Spietelun A, Namieśnik J - Anal Bioanal Chem (2014)

Bottom Line: The analysis of variance confirmed the significant influence of temperature, salt content, and pH of samples on the extraction efficiency.The results obtained showed that PCL is an interesting sorbent which can be successfully applied for isolation of polar organics from aqueous matrices at a broad range of analytes concentration.The practical applicability of the developed fiber has been confirmed by the results based on the analysis of real samples.

View Article: PubMed Central - PubMed

Affiliation: Chemical Faculty, Department of Physical Chemistry, Gdansk University of Technology, Narutowicz St., Gdańsk, 80-233, Poland.

ABSTRACT
Commercially available solid-phase microextraction fibers used for isolation of polar analytes are based on the adsorption phenomenon. In consequence, typical limitations bonded with analytes displacement and matrix effects are very frequent. In the present study, alternative solution is described. Polycaprolactone (PCL) was used for the first time as sorbent to isolate polar organic compounds from water samples using the membrane-solid-phase microextraction (M-SPME) technique. In this technique, due to protective role of the mechanically and thermally stable polydimethylsiloxane (PDMS) membrane, internal polar coating might be melted during extraction and desorption of analytes. In consequence sorbents with low melting points like a PCL might be utilized. Based on chromatographic retention data, triazines were selected as a model compounds for evaluation of the sorptive properties of the polycaprolactone. Applying the screening plan and central composite design, statistically significant parameters influencing extraction efficiency were determined and optimized. The analysis of variance confirmed the significant influence of temperature, salt content, and pH of samples on the extraction efficiency. Besides the new PCL/PDMS fiber, a commercial fiber coated with divinylbenzene/polydimethylsiloxane (DVB/PDMS) was used for comparative studies. The results obtained showed that PCL is an interesting sorbent which can be successfully applied for isolation of polar organics from aqueous matrices at a broad range of analytes concentration. The determined detection limits of procedure based on the novel fiber enable its application at the concentration levels of triazines recommended by the US EPA standards. The practical applicability of the developed fiber has been confirmed by the results based on the analysis of real samples.

No MeSH data available.


Response surfaces as functions of optimal parameters, calculated for the PCL/PDMS fiber for a temperature vs. salt concentration, b temperature vs pH, and c salt concentration vs pH
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Fig5: Response surfaces as functions of optimal parameters, calculated for the PCL/PDMS fiber for a temperature vs. salt concentration, b temperature vs pH, and c salt concentration vs pH

Mentions: Response surface functions were fitted to the obtained data using the model including linear main effects, quadratic terms, and two-factor interactions. The response surfaces obtained for the commercial and PCL/PDMS fibers are presented in Figs. 4 and 5, respectively. In both cases, the response surfaces were plotted for the three combinations of independent variables; each response surface was calculated by assuming the mid-range value for the third variable. For example, pH 7 was used to calculate the response surface for the relationship between temperature and salt concentration. The models obtained for the commercial and PCL/PDMS fibers showed quite a good fit as described by the respective R2 values of 0.921 and 0.957.Fig. 4


Evaluation of polycaprolactone as a new sorbent coating for determination of polar organic compounds in water samples using membrane-SPME.

Marcinkowski Ł, Kloskowski A, Spietelun A, Namieśnik J - Anal Bioanal Chem (2014)

Response surfaces as functions of optimal parameters, calculated for the PCL/PDMS fiber for a temperature vs. salt concentration, b temperature vs pH, and c salt concentration vs pH
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4305092&req=5

Fig5: Response surfaces as functions of optimal parameters, calculated for the PCL/PDMS fiber for a temperature vs. salt concentration, b temperature vs pH, and c salt concentration vs pH
Mentions: Response surface functions were fitted to the obtained data using the model including linear main effects, quadratic terms, and two-factor interactions. The response surfaces obtained for the commercial and PCL/PDMS fibers are presented in Figs. 4 and 5, respectively. In both cases, the response surfaces were plotted for the three combinations of independent variables; each response surface was calculated by assuming the mid-range value for the third variable. For example, pH 7 was used to calculate the response surface for the relationship between temperature and salt concentration. The models obtained for the commercial and PCL/PDMS fibers showed quite a good fit as described by the respective R2 values of 0.921 and 0.957.Fig. 4

Bottom Line: The analysis of variance confirmed the significant influence of temperature, salt content, and pH of samples on the extraction efficiency.The results obtained showed that PCL is an interesting sorbent which can be successfully applied for isolation of polar organics from aqueous matrices at a broad range of analytes concentration.The practical applicability of the developed fiber has been confirmed by the results based on the analysis of real samples.

View Article: PubMed Central - PubMed

Affiliation: Chemical Faculty, Department of Physical Chemistry, Gdansk University of Technology, Narutowicz St., Gdańsk, 80-233, Poland.

ABSTRACT
Commercially available solid-phase microextraction fibers used for isolation of polar analytes are based on the adsorption phenomenon. In consequence, typical limitations bonded with analytes displacement and matrix effects are very frequent. In the present study, alternative solution is described. Polycaprolactone (PCL) was used for the first time as sorbent to isolate polar organic compounds from water samples using the membrane-solid-phase microextraction (M-SPME) technique. In this technique, due to protective role of the mechanically and thermally stable polydimethylsiloxane (PDMS) membrane, internal polar coating might be melted during extraction and desorption of analytes. In consequence sorbents with low melting points like a PCL might be utilized. Based on chromatographic retention data, triazines were selected as a model compounds for evaluation of the sorptive properties of the polycaprolactone. Applying the screening plan and central composite design, statistically significant parameters influencing extraction efficiency were determined and optimized. The analysis of variance confirmed the significant influence of temperature, salt content, and pH of samples on the extraction efficiency. Besides the new PCL/PDMS fiber, a commercial fiber coated with divinylbenzene/polydimethylsiloxane (DVB/PDMS) was used for comparative studies. The results obtained showed that PCL is an interesting sorbent which can be successfully applied for isolation of polar organics from aqueous matrices at a broad range of analytes concentration. The determined detection limits of procedure based on the novel fiber enable its application at the concentration levels of triazines recommended by the US EPA standards. The practical applicability of the developed fiber has been confirmed by the results based on the analysis of real samples.

No MeSH data available.