Solid-phase extraction sorbents for

Vaananen, T., Kuronen, P., Pehu, E. (2000). Comparison of commercial solid-phase extraction sorbents for the sample preparation of potato glycoalkaloids. J. Chromatogr. A, 869, 301-305. 

Pichon, V., A.I. Krasnova, and M.C. Hennion. 2004. Development and characterization of an immunoaf-finity solid-phase-extraction sorbent for trace analysis of propanil and related phenylurea herbicides in environmental waters and in beverages. Chromatographia 60 S221-S226. 

Andersson, L. I. Paprica, A. Arvidsson, T., A highly selective solid-phase extraction sorbent for preconcentration of sameridine made by molecular imprinting, Chromatographia 1997, 46, 57-62... 

Dzygiel, P. O Donnell, E. Fraier, D. Chassaing, C. Cormack, P. A. G., Evaluation of water-compatible molecularly imprinted polymers as solid-phase extraction sorbents for the selective extraction of sildenafil and its desmethyl metabolite from biological samples, J. Chromatogr. B 2007, 853(1-2), 346-353... 

Theodoridis, G. Manesiotis, P. Selective solid-phase extraction sorbent for caffeine made by molecular imprinting. J. Chromatogr. A. 2002, 948 (1-2), 163-169. 

Mohamed R, Mottier P, Treguier L, et al.. Use of molecularly imprinted solid-phase extraction sorbent for the determination of four 5-nitroimidazoles and three of their metabolites from egg-based samples before tandem LC-ESIMS/MS analysis, J. Agric. Food Chem. 2008 56 3500-3508. 

Baggiani, C. Giovannoli, C. Anfossi, L. Tozzi, C. Molecularly imprinted solid-phase extraction sorbent for the clean-up of chlorinated phenoxyacids from aqueous samples. J. Chromatogr. A 2001, 938, 35-44. 

Zhang, Z. Zhang, H. Hu, Y. Yang X Yao, S. (2010d). Novel surface molecularly imprinted material modified multi walled carbon nanotubes as solid phase extraction sorbent for selective extraction gallium ion from fly ash. Talanta, 82, 304-311. 

Georga, K.A. Samanidou, V.F. Papadoyannis, l.N. The use of novel solid phase extraction sorbent materials for HPLC quantitation of caffeine metabolism products methyl-xanthines and methyluric acids in samples of biological origin. J. Chromatogr., B 2001, 759, 209 -218. 

Numerous articles can be found on the use of sorbent materials such as silica, stainless steel beads, and common solid-phase extraction materials for collection of supercritical fluid-extracted analytes.38 2 In this scenario the fluid is usually allowed to expand into a gas, which is forced through a packed bed of solid sorbent material. The analytes are bound or simply deposited and cryogenically trapped onto the sorbent and are later eluted with appropriate solvents. The advantage of this technique is that further cleanup can be performed by carefully selecting the eluting solvent. 

The microwave distillation SPE apparatus is shown in Figure 9.12. A filet of catfish is placed in the microwave oven and heated, which drives the geosmin out of the tissue and is swept through the solid-phase extraction sorbent with argon gas. The condenser unit cools the gas, which increases the retention of geosmin, onto the 500 mg of C-18 in Figure 9.12. The sorbent is present in the bottom of the condenser unit. Charcoal, XAD-2, and C-18 were all tried for recovery of geosmin, and C-18 had the best recovery. 

In addition to electrophoresis-based collection of DNA in microchannels (see Section 7.7.3), adsorbents have been used to collect and purify DNA. In these cases, microchannels are generally used because of the small quantity of material requiring collection. Using solid phase extraction, sorbent particles of nano- and micro-silica and micro-sized octadecylsilica were immobilized using sol-gel chemistry to hU the microchannels of the microfluidic device [194]. DNA as well as several organic compoimds were evaluated for adsorption and desorption. They showed excellent adsorption, but poor recovery because they were difficult to extract. 

The last part of the book, Chapters 10—17, reports on different applications of polymers in the field of analytical chemistry sorption of organic compounds, Hke phenols, pesticides or caffeine, the use of polymeric materials for size-exclusion chromatography, for HPLC packing materials or as solid phase extraction sorbents. The examples cover a broad variety of chemical compounds, fike pesticides, pharmaceuticals, organic acids in different matrices, such as food, biological fluids, non-aqueous media, air and the use of hemosorbents in blood purification. 

FIGURE 11.6 Graph of retention versus elution strength for a solid-phase extraction sorbent. 

The low selectivity of the SPE columns currently in use can be increased with more selective sorbents such as the immunosorbents, which have been quite extensively used in SPE-LC (72). Immunoaffinity-based solid-phase extraction (lASPE) sorbents have also been used in coupled gas chromatography for determining... 

N. Masque R. M. Marce and P. Bonnll, New polymeric and other types of sorbents for solid-phase extraction of polar organic micropollutants from envir onmental water . Trends. Anal. Chem. 17 384-394 (1998). 

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