Refractometric detector in microcolumn exclusion high performance chromatography of polymers

Aleksandrov, M. S.; Belen'kii, B.G.; Gankina, E.S.; Gotlib, V. A.; Kever, J. J.; Komarov, N.N.; Pavlenko, Vadim A.

doi:10.1002/jhrc.1240061112

Cited by 4 publications

(1 citation statement)

References 2 publications

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“…microcolumns packed with TSK gel G-3000 and a spectrophotometric detector for molecular weight (MW) determinations of unsaturated polyesters. [9] suggested that a laser interferometric detector with a sample cell volume of 0.2 pL should be used. However, the peak asymmetry increased with MW and elution rate.…”

Section: Problems Of Micro Size-exclusion Chromatographymentioning

confidence: 99%

Optimization of the eluent delivery system for micro size‐exclusion chromatography

Alexandrov

Belen'kii

Gotlib

et al. 1992

J Microcolumn Separations

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Abstract. The problems of microcolumn size-exclusion chromatography and its instrumentation are considered. It is shown that the reproducibility of retention times of a micro-gel chromatograph depends on the stability of eluent delivery by a syringe micropump. It is possible to increase this stability and to suppress the relaxation processes related to the changes in hydrodynamic column resistance and in the solvent temperature in the pump chamber.In order to suppress instability when columns of 0.5-mm inner diameters are used, the volume of the eluent delivery system should be as small as possible (Vp < 1 mL) and the system should be thermostatted at AT (P,(a/fl)6 where P, is the pressure under conditions of constant pump pressure, a and fl are the coefficients of thermal expansion and compressibility of the liquid, and 6 is the permissible retention time error (At&).

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Section: Problems Of Micro Size-exclusion Chromatographymentioning

confidence: 99%

Optimization of the eluent delivery system for micro size‐exclusion chromatography

Alexandrov

Belen'kii

Gotlib

et al. 1992

J Microcolumn Separations

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Modification of a refractive index detector for use with semi‐microbore HPLC columns

Reed

1986

J. High Resol. Chromatogr.

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OBu'). Column: stainless-steel tubing, 20 cm length and 4 mm i.d., packed with N-formyl-L-valyl-aminopropylsilanized silica.Enantiomeric pairs of cysteine derivatives eluted first, followed by those of the tryptophan derivatives. l h e o-isomers of both racemic samples eluted faster than the L-isomers. The elution order was identical with that of liquid chromatographic separations using binary solvents consisting of a diluent and stronger solvent. The chromatographic process responsible for recognition of the enantiomers in SF is assumed to be similar to that in organic solvent phase systems [6,7]. In either case, the enantiomeric retention order should be related to the stability difference of the diastereomeric complex formed by the solutes and chiral stationary phase in the liquid or SF.Fast optical resolution of the enantiomers was also performed by preparative scale SFchromatography.The resultswill be reported in a future paper.

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Some aspects of analytical instrumentation: models, techniques, instruments

Alexandrov

Andreev

1989

Z. Anal. Chem.

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Refractometric detector in microcolumn exclusion high performance chromatography of polymers

Cited by 4 publications

References 2 publications

Optimization of the eluent delivery system for micro size‐exclusion chromatography

Optimization of the eluent delivery system for micro size‐exclusion chromatography

Modification of a refractive index detector for use with semi‐microbore HPLC columns

Some aspects of analytical instrumentation: models, techniques, instruments

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