Solvent extraction of halogens

Summary The solubility formula previously proposed was applied to the partition of halogens between water and some typical organic solvents, and the character of parameter in the formula was examined. The formula reproduces the experimental data of the solvent extraction of halogens reasonably. The ratio is controlled by the solute independently of the solvent. The ratio is unity for all solutes in the water-hydrocarbon system, and is 3 ^n–1 (n is periodic number) depending on the solute in the water-non-hydrocarbon system.

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Lösungsmittelextraktion von Halogenen

Zusammenfassung Die früher vorgeschlagene Löslichkeitsformel wurde auf die Verteilung von Halogenen zwischen Wasser und einigen typischen organischen Lösungsmitteln angewendet und der Charakter des Parameters in der Formel untersucht. Die Formel gibt die experimentellen Werte der Halogenextraktion zufriedenstellend wieder. Das Verhältnis der -Werte wird vom Gelösten unabhängig vom Lösungsmittel bestimmt. Dieses Verhältnis ist im Wasser-Kohlenwasserstoff-System in allen Fällen gleich 1. Im System aus Wasser und Nicht-Kohlenwasserstoff hängt es vom Gelösten ab und beträgt 3 ^n–1 (n = Periodenzahl des Halogens).

     

Gas chromatography of halogens

Summary The semi-empirical theory on the retention volume in gas chromatography recently developed by some experiments, was found to require partial correction. It was newly refined and summarized. Overall experimental checking was performed by the use of Cl₂, Br₂, and I₂.

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Gas-Chromatographie von Halogenen

Zusammenfassung Die halbempirische Theorie über das Retentionsvolumen in der Gas-Chromatographie, die kürzlich an Hand einiger Versuche entwickelt wurde, erforderte eine teilweise Korrektur. Sie wurde verbessert und zusammenfassend dargestellt. Kontrollversuche wurden mit Hilfe von Chlor, Brom und Jod durchgeführt.

     

Soil bacterial hydrolysis leading to genuine aglycone—IX : A steroidal prosapogenol of new type from epigeous part of Metanarthecium luteo-viride maxim. and characterization of 3-epi-metagenin

By virtue of the soil bacterial hydrolysis method, a mixture (ca 12:1) of prosapogenols has been isolated, and on the basis of chemical and physicochemical evidence, the structure of major component (designated as NE-1A) has been established as 2β - acetoxy - 3α - hydroxy - 11α- (tri -O- acetyl - α - L - arabinopyranosyl)oxy - 5β, 25R - spirostane (10), and the minor presumed as its 3-epimer (11). NE-1A (10) is characteristic of possessing a fully acetylated arabinoside linkage at C-11 of a new steroidal aglycone 3-epi-metagenin (9), which is a ninth spirostanol isolated from the titled plant.Finally, NE-1A (10) has been subjected to detailed PMR examinations including homonuclear INDOR, double and triple resonance experiments, and the prominent signals have been assigned.     

Multivariate analysis for 1H-NMR spectra of two hundred kinds of tea in the world.

NMR measurements coupled with pattern-recognition analysis offer a powerful mixture-analysis tool for latent-feature extraction and sample classification. As fundamental applications of this analysis for mixtures, the 1H spectra of 176 kinds of green, black, oolong and other tea infusions were acquired by a 500 MHz NMR spectrometer. Each spectrum pattern was analyzed by a multivariate statistical pattern-recognition method where Principal Component Analysis (PCA) was used in combination with Soft Independent Modeling of Class Analogy (SIMCA). SIMCA effectively selected variables that contribute to tea categorization. The final PCA resulted in clear classification reflecting the fermentation and processing of each tea, and revealed marker variables that include catechin and theanine peaks.