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High performance liquid chromatography compounds

Selectivity of chromatographic separation is known to be varied by changing both the nonstationary phase composition and adsorbent nature. It is shown that the less are the values of the reached selectivity coefficient the higher are the requirements to column effectiveness. In this connection the choice of stationai y phase with high and predicted selectivity coefficient for the compounds being separated is still remains a topical problem of high-performance liquid chromatography. [Pg.138]

High performance liquid chromatography is an effective technique for the separation of compounds of high molecular weight. There are, however, two major problems with the use of mass spectrometry for the study of this type of molecule... [Pg.156]

CALDWELL c R (2001) Oxygen radical absorbance capacity of the phenolic compounds in plant extracts fractionated by high-performance liquid chromatography, ,4Biochem, 293, 232-8. [Pg.341]

Paganga, G. et al.. The polyphenolic content of fruit and vegetables and their antioxidant activities what does a serving constitute Free Radical Res., 30, 153, 1999. Maatta, K.R. et al.. High-performance liquid chromatography (HPLC) analysis of phenolic compounds in berries with diode array and electrospray ionization mass spectrometric (MS) detection Rihes species, J. Agric. Food Chem., 51, 6736, 2003. [Pg.84]

Canjura, F.L. and Schwartz, S.J., Separation of chlorophyll compounds and then-polar derivatives by high-performance liquid chromatography, J. Agric. Food Ghem., 39, 1102, 1991. [Pg.444]

Figure 3 Structures of daidzein, liquiritigenin, naringenin, couniestrol, genistein, and isoiiquiritigenin, the substances identified by high-performance liquid chromatography. Biosynthetic relationships of compounds are indicated. (From Ref. 13.)... Figure 3 Structures of daidzein, liquiritigenin, naringenin, couniestrol, genistein, and isoiiquiritigenin, the substances identified by high-performance liquid chromatography. Biosynthetic relationships of compounds are indicated. (From Ref. 13.)...
High-performance liquid chromatography (HPLC) with a micellar mobile phase or with a selective pre-column or reaction detection system has also been used to determine alkylenebis(dithiocarbamaes). ° Zineb and mancozeb residues in feed were determined by ion-pair HPLC with ultraviolet (UV) detection at 272 nm. These compounds were converted to water-soluble sodium salts with ethylenediaminetetra-acetic acid (EDTA) and sodium hydroxide. The extracts were ion-pair methylated with tetrabuthylammonium hydrogensulfate (ion-pair reagent) in a chloroform-hexane solvent mixture at pH 6.5-8.S. The use of an electrochemical detector has also been reported. ... [Pg.1091]

Baillet, A., Corbeau, L., Rafidson, R, and Ferrier, D., Separation of isomeric compounds by reversed-phase high-performance liquid chromatography using Ag+ complexation. Application to cis-trans fatty acid methyl esters and retinoic acid photoisomers, /. Chromatogr., 634, 251, 1993. [Pg.51]

Schieffer, G. W., Preliminary examination of a new post-column photolysis-molybdate reaction detection system for the determination of organophos-phorus compounds by high performance liquid chromatography, Instr. Sci. Technol., 23, 255, 1995. [Pg.52]

McCalley, D. V., Effect of organic solvent modifier and nature of solute on the performance of bonded silica reversed-phase columns for the analysis of strongly basic compounds by high-performance liquid chromatography, /. Chromatogr A, 738(2), 169, 1996. [Pg.210]

Other kinds of bloassays have been used to detect the presence of specific allelochemical effects (8), effects on N2 fIxatlon (9), the presence of volatile compounds (10) and of Inhibitory substances produced by marine microalgae (11). Putnam and Duke (12) have summarized the extraction techniques and bioassay methods used In allelopathy research. Recent developments In high performance liquid chromatography (HPLC) separation of allelochemlcals from plant extracts dictates the need for bloassays with sensitivity to low concentrations of compounds contained In small volumes of eluent. Einhellig at al. (13) described a bloassay using Lemna minor L. growing In tissue culture cluster dish wells that maximizes sensitivity and minimizes sample requirements. [Pg.198]

Krikorian SE, Chom TA, King JW. 1987. Determination of octanol/water partition coefficients of certain organophosphorus compounds using high-performance liquid chromatography. Quant Struct-Act Relat 6(2) 65-69. [Pg.150]

Suatoni, J.C. Swab, R.E. Preparative Hydrocarbon Compound Type Analysis by High Performance Liquid Chromatography, J. Chromatogr. Sci. 1976,14, 535. [Pg.389]

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See also in sourсe #XX -- [ Pg.251 ]



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