✦ LIBER ✦

Extraction-Chromatographic Separation and Concentration of Phenol and Guaiacol with the Use of Organic Solvent Mixtures as Stationary Phases

✍ Scribed by Ya. I. Korenman; I. V. Vatutina; A. T. Alymova

Book ID: 110315987
Publisher: SP MAIK Nauka/Interperiodica
Year: 2001
Tongue: English
Weight: 48 KB
Volume: 74
Category: Article
ISSN: 1070-4272
DOI: 10.1023/a:1012724429925

No coin nor oath required. For personal study only.

📜 SIMILAR VOLUMES

Extraction-chromatographic separation of

Extraction-chromatographic separation of iron from cobalt, nickel, and copper using dibenzyl sulphoxide solution as the stationary phase

✍ F. Vláčil; Huynh Dang Khanh 📂 Article 📅 1980 🏛 Springer 🌐 English ⚖ 339 KB

Flow-injection luminescence determinatio

Flow-injection luminescence determination of phenols with extraction-chromatographic preconcentration and chromatomembrane separation of the extract from the aqueous phase

✍ A. L. Moskvin; L. N. Moskvin; A. V. Mozzhukhin; V. V. Fomin 📂 Article 📅 2000 🏛 SP MAIK Nauka/Interperiodica 🌐 English ⚖ 397 KB

Bare silica as a reverse-phase stationar

Bare silica as a reverse-phase stationary phase: Liquid chromatographic separation of antihistamines with buffered aqueous organic mobile phases

✍ Harold Richardson; Brian A. Bidlingmeyer 📂 Article 📅 1984 🏛 John Wiley and Sons 🌐 English ⚖ 302 KB

Unbonded silica gel is an effective support for reverse-phase liquid chromatographic separations of lipophilic amines. Simple buffered aqueous-organic mobile phases provide rapid isocratic separations of antihistamines. Phenylpropanolamine hydrochloride, chlorpheniramine maleate, and dextromethorpha

Modelling and optimization of the electr

Modelling and optimization of the electrokinetic chromatographic separation of mixtures of organic anions and cations using poly(diallydimethyl- ammonium chloride) and hexanesulfonate as mixed pseudostationary phases

✍ Philip Zakaria; Miroslav Macka; James S. Fritz; Paul R. Haddad 📂 Article 📅 2002 🏛 John Wiley and Sons 🌐 English ⚖ 162 KB 👁 1 views

Saliva and serum samples were collected

Saliva and serum samples were collected from eight healthy volunteers every two hours during a 26-hour period. Melatonin concentrations were measured by radioimmunoassay after chloroform extraction using radioiodinated melatonin as a tracer. Five of the subjects had high serum melatonin levels at night (peak levels higher than 75 pg/ml); in three subjects the highest serum melatonin concentration was 20-40 pg/ml. All subjects had low levels (P <0.001, was obtained for all detectable value pairs (n= 73). The regression and correlation coefficients were almost equal for the peak values of melatonin and during the rising and descending phases of the secretion patterns. However, no significant correlation was found between low daytime salivary and serum concentrations when calculated separately. In the five high-secretors the melatonin levels in saliva reflected reliably the changes in serum, but in the three low-secretors the correlation between salivary and serum melatonin was not significant. The proportion of melatonin found in saliva decreased with increasing serum melatonin levels. Circadian rhythm parameters were estimated by single cosinor analysis. The acrophases did not differ significantly within a subject in the concomitant measurements of serum and salivary melatonin. The measurements of salivary melatonin levels seem valid for studies on melatonin rhythms, but the melatonin concentrations measured in saliva do not always consistently reflect the absolute concentrations in blood.

✍ Maija-Liisa Laakso; Tarja Porkka-Heiskanen; Aino Alila; Dag Stenberg; Gunnar Joh 📂 Article 📅 1990 🏛 John Wiley and Sons 🌐 English ⚖ 622 KB