Solid-phase extraction, with

C. Aguilar, P. BottuII and R. M. Marce, On-line and off-line solid-phase extraction with styrene-divinylbenzene-membrane extr action disks for determining pesticides in... 

Chiaia AC, Banta-Green C, Field J (2008) Eliminating solid phase extraction with large-volume injection LC/MS/MS analysis of illicit and legal drags and human urine indicators in US wastewaters. Environ Sci Technol 42(23) 8841-8848... 

A method has been reported [481] for the determination of flavins in seawater. The method is based on solid-phase extraction. With ion-pair HPLC using fluorescence detection, concentrations in the picomolar range can be measured. 

Curran DP, Luo ZY (1999) Fluorous Synthesis with Fewer Fluorines (Light Flu-orous Synthesis) Separation of Tagged from Untagged Products by Solid-Phase Extraction with Fluorous Reverse-Phase Silica Gel. J Am Chem Soc 121 9069-9072... 

Niederlander H.A.G. et al., 2006. High throughtput therapeutic drug monitoring of clozapine and metabolites in serum by online coupling of solid phase extraction with liquid chromatography-mass spectrometry. J Chromatogr B 834 98. 

Pruvost A. et al., 2000. Fully automated determination of eserine N-oxide in human plasma using online solid-phase extraction with liquid chromatography coupled with electrospray ionization tandem mass spectrometry. J Mass Spectrom 35 625. 

Wissiack R., Rosenberg E., and Grasserbauer M., 2000. Comparison of different sorbent materials for online solid-phase extraction with liquid chromatography-atmospheric pressure chemical ionization mass spectrometry of phenols. J Chromatogr B 896 159. 

Mills and Thurman [105] studied the mixed mode isolation of Triazine metabolites from soils using automated solid phase extraction with methanohwater (4 lu/u) extracts of the sample. Methanol is evaporated from the extract and the metabolites are collected on an octadecyl resin (Cl8) column. The analytes are eluted with ethyl acetate leaving the impurities on the C18 resin column. The detection limit of this method is 0-lgg kg 1-... 

Mills and Thurmen [105] used a mixed method for the isolation of triazine herbicide metabolites from aquifer sediments using automated solid phases extraction with a mixture of methanol and water (4 1 V/V). Following evaporation of the methanol phases, the metabolites were collected in a column of Cl8 octadecyl resin. The analytes were then stripped from the column with ethyl acetate leaving impurities on the column. Down to O.lpg kg-1 triazine could be determined. 

Water Solid phase extraction with Empore disk. Eluted with ethyl acetate. Dried with sodium sulfate, concentrated. GC/ECD 4 ppt 86 Tomkins et al.1992... 

Nakamura, M., Suzuki, T., Amano, K., and Yamada, S. Relation of sorption behavior of agricultural chemicals in solid-phase extraction with their n-octanolAvater partition coefficients evaluated by high-performance liquid chromatography. Anal Chim. Acta, 428(2) 219-226, 2001. 

E. Kenduezler, O. Yalcinkaya, S. Baytak and A. R. Tuerker, Application of full factorial design for the preconcentration of chromium by solid phase extraction with Amberlyst 36 resin, Microchim. Acta, 160(4), 2008, 389-395. 

Curran, D. P. Hadida, S. He, M. Thermal Allylations of Aldehydes with a Fluorous Allylstannane. Separation of Organic and Fluorous Products by Solids Phase Extraction with Fluorous Reverse Phase Silica Gel, J. Org. Chem. 1997, 62, 6714. 

Altenbach, and W. Giger, Determination of benzenesulfonates and naphthalenesulfonates in waste-water by solid-phase extraction with graphitized carbon-black and ion-pair liquid-chromatography with UV-detection , Anal. Chem., 67, 2325-2333 (1995). 

Barbital can be isolated from urine by solid-phase extraction with C 8-silica. The barbital is then eluted with 1 1 vol/vol acetone chloroform. Explain how this procedure works. 

A capillary gas chromatographic method is described for determination of major phytosterols and cholesterol in edible oils and fats. To extract the unsaponifiable matter and for sample cleanup, solid-phase extraction with C18 absorbent was used. 

The Basic Protocol describes the reversed-phase HPLC analysis of polyphenolic compounds isolated into nonanthocyanin and anthocyanin fractions by solid-phase extraction. The Alternate Protocol describes the HPLC separation of acidic and neutral polyphenolic fractions. Fractionated samples are used because significant amounts of interfering compounds are extracted along with polyphenolics from plant materials. Solid-phase extraction with C18 Sep-Pak cartridges (vnitu.2) is used to selectively eliminate undesired components from crude extracts, and may minimize the effects of sample cleanup or preparation on the integrity of polyphenolics. The isolation and purification step using solid-phase extraction of polyphenolics will make possible the efficient analysis of individual polyphenolics by reversed-phase HPLC. 

Clarification with Carrez solutions can be used to eliminate interfering compounds (14,44,45). Purification, isolation, or concentration of the extract can also be performed by solid-phase extraction with C8 (53) or Cl8 (46,47,75). Hayakawa et al. (75) used Sep-Pak Cl8 cartridges for the separation of aspartame from its degradation products. The sample was applied to the Sep-Pak, and degradation products and aspartame were eluted with 10% and 30% methanol in acetate buffer, respectively. 

Extraction of samples is described in Sec. I.C (16). Extracts might need purification or concentration, which can be performed by solid-phase extraction with Sep-Pak or Alumina Sep-Pak C18 cartridges (87). 

The assessment of mutagenic activity in cooked foods requires tedious extraction work in order to isolate and quantify the responsible chemicals at the nanogram level. Efforts have been made to develop a rapid and efficient method to obtain chromatograms free of interfering material. Coextracted matrix components influence analyte detection limits more than does absolute detector sensitivity (182). The sample workup therefore is the most critical part of the analysis (183). Solid-phase extraction with different coupled columns provides an improvement (176) over LLE and the use of large columns filled with XAD resin. The determination of PAHs and PANHs in food has been carried out by different chromatographic techniques, including LC with fluorescence (164,171,184) and/or UV detection (185,171) and GC with FID (168,186) or MS detection (187). 

Solid-Phase Extraction with MIPs (MISPE). 276... 

J. L. Bernal, M. J. Nozal, L. Toribio, M. L. Serna, F. Borrull, R. M. Marce and E. Pocurull, Determination of polycyclic aromatic hydrocarbons in waters by use of supercritical fluid chromatography coupled on-line to solid-phase extraction with disks , J. Chromatogr. 778 321-328 (1997). 

Mills et al. [367] have described a method for the isolation of triazine metabolites from soil using automated solid-phase extraction with methanol water... 

Adjustment of pH Adjustment of pH (to 3 and 11) provides additional information on the nature of the toxicants, and provides blanks for subsequent pH adjustment tests performed in combination with other treatments (/.< ., filtration, aeration). Samples are adjusted to pH 3 and 11, and then subjected to filtration, aeration, or solid phase extraction with a Cl8 column. The treated samples (including the pH adjusted samples without additional treatment) are re-adjusted to the initial pH of the effluent (pH 7) prior to testing. 

Caro, E., R.M. Marce, P.S.G. Cormack, D.C. Sherrington, and F. Borrull. 2003. On-line solid-phase extraction with molecularly imprinted polymers to selectively extract substituted 4-chlorophenols and 4-nitrophenol from water. J. Chromatogr. A 995 233-238. 

M. J. M. Wells and G. K. Stearman, Coordinating supercritical fluid and solid-phase extraction with chromatographic and immunoassay analysis of herbicides, in M. T. Meyer and E. M. Thurman, eds., Herbicide Metabolites in Surface Water and Groundwater, ACS Symposium Series 630, American Chemical Society, Washington, DC, 1996, pp. 18-33. 

Phenoxy carboxylic acids Solid phase -extraction with C18 resin Phenoxyacetic acids derivativised with pentafluorobenzyl bromide, then GLC ppt [409]... 

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