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The dipole approach in ion-interaction chromatography of zwitterions
Springer Science and Business Media LLC - Tập 54 Số 1 - Trang 38-44 - 2001
Cecchi, T., Pucciarelli, F., Passamonti, P., Cecchi, P.
The chromatographic behavior of zwitterions in Ion-interaction chromatography (IIC) is, investigated theoretically for the first time. The modification of the stationary phase in the presence of Ion-interaction reagent (IIR), and adsorption competition between test analytes and IIR for inner layer sites are shown theoretically to change the partition coefficient for zwitterions. Experimental resul...... hiện toàn bộ
The obstruction factor γ in gas chromatography
Springer Science and Business Media LLC - Tập 14 - Trang 576-578 - 1981
P. Thumneum, S. Hawkes
The relationship between the obstructive factor γ and velocity was restudied. The dependence of the obstructive factor on velocity was verified. The effects of diffusion coefficient and particle-to-column diameter ratio on the obstructive factor-velocity relationship were investigated. The results are consistent with Hawkes' hypothesis that values of γ at low velocities are averages over tightly p...... hiện toàn bộ
The mass detector: A new detection system for carbohydrate and lipid analyses
Springer Science and Business Media LLC - - 1982
R. Macrae, L.C. Trugo, J. Dick
Denis Desty 70 years old
Springer Science and Business Media LLC - Tập 37 - Trang 357-358 - 1993
Edward R. Adlard
Preparative Isolation and Purification of Flavonoids and Protocatechuic Acid from Sea Buckthorn Juice Concentrate (Hippophaë rhamnoides L. ssp. rhamnoides) by High-Speed Counter-Current Chromatography
Springer Science and Business Media LLC - Tập 65 - Trang 1-7 - 2006
D. Gutzeit, V. Wray, P. Winterhalter, G. Jerz
High-speed counter-current chromatography (HSCCC)—a support free all liquid–liquid chromatography technique—has been successfully used for the preparative isolation of isorhamnetin 3-O-β-d-glucoside, isorhamnetin 3-O-β-rutinoside, quercetin 3-O-β-d-glucoside, syringetin 3-O-β-d-glucoside and protocatechuic acid from sea buckthorn juice concentrate (Hippophaë rhamnoides L. ssp. rhamnoides, Elaeagna...... hiện toàn bộ
Ethylene oxide pollution evaluation part I: Sampling with active charcoal tubes
Springer Science and Business Media LLC - Tập 21 - Trang 201-204 - 1986
G. Greff, J. Delcourt, J. P. Guenier, B. Herve-Bazin, J. Muller
Air sampling of ethylene oxide on active charcoal tubes followed by GC analysis is a frequently proposed method. This paper studies just to what extent it can be used, defining its limitations (concentration range, influence of ambient temperature and relative humidity), which are seldom taken seriously into account. This method proves inadequate to determine low pollution levels, i.e. around 2 mg...... hiện toàn bộ
HPLC separation and relative quantitation of kaempferol glycosides in soybean
Springer Science and Business Media LLC - Tập 25 Số 12 - Trang 1049-1053 - 1988
J. D. Gaynor, B. R. Buttery, R. I. Buzzell, D. C. Mac Tavish
Acid/base characterization of sepiolite by inverse gas chromatography
Springer Science and Business Media LLC - Tập 31 - Trang 357-361 - 1991
E. Morales, M. V. Dabrio, C. R. Herrero, J. L. Acosta
The surface properties of sepiolite were investigated by inverse gas chromatography. It is shown that the value of the dispersive component change uniformly with temperature, while the values obtained for the parameters KA and KD indicate an acidic character for the sepiolite surface.
Monolithic ODS-silica gel column for determination of hydrogen, sodium, ammonium and potassium in acid rain by lon chromatography
Springer Science and Business Media LLC - Tập 57 - Trang 19-22 - 2003
Q. Xu, K. Tanaka, M. Mori, M. I. Helaleh, H. toada, W. Hu, K. Hasebe
A monolithic ODS-silica gel column modified by saturating it with lithium dodecylsulfate (Li-DS) was firstly used to separate monovalent cations simultaneously including H+, Na+, NH4 + and K+ by ion-chromatography (IC). Using an acidified 60 mM LiCl solution (pH 3.95, containing 0.10 mM Li-DS) as eluent, these monovalent cations were separated well in the order of Na+... hiện toàn bộ
HPLC Separation of Enantiomers of Some Flavanone Derivatives Using Polysaccharide-Based Chiral Selectors Covalently Immobilized on Silica
Springer Science and Business Media LLC - Tập 79 - Trang 119-124 - 2016
Chiara Fanali, Salvatore Fanali, Bezhan Chankvetadze
The separation of enantiomers of flavanone and 5 chiral flavanone derivatives was studied on two experimental polysaccharide-based chiral columns by high-performance liquid chromatography with methanol, ethanol, acetonitrile, n-hexane/ethanol and n-hexane/2-propanol as mobile phases with emphasis on the effect of analyte and chiral selector structure on separation parameters. Since chiral selector...... hiện toàn bộ
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