W320218

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Pyrrole alkaloids from Bolbostemma paniculatum.

Wen-Yong Liu et al.

Journal of Asian natural products research, 5(3), 159-163 (2003-08-23)

Three pyrrole alkaloids were isolated from Bolbostemma paniculatum. Their structures were elucidated as 4-(2-formyl-5-methoxymethylpyrrol-1-yl)butyric acid methyl ester (1), 2-(2-formyl-5-methoxymethylpyrrol-1-yl)-3-phenylpropionic acid methyl ester (2) and alpha-methyl pyrrole ketone (3) by spectroscopic techniques. Among them, 1 and 2 are new compounds.

Mutagen formation in the reaction of Maillard browning products, 2-acetylpyrrole and its analogues, with nitrite.

G C Yen et al.

Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association, 24(12), 1303-1308 (1986-12-01)

Three 2-substituted pyrroles (2-acetylpyrrole, pyrrole-2-carboxaldehyde and pyrrole-2-carboxylic acid), which are products of the Maillard browning reaction, were reacted with nitrite in buffer solution (pH 3) at 50 degrees C for 24 hr. The reaction mixtures were extracted with methylene chloride

Extension of a dynamic headspace multi-volatile method to milliliter injection volumes with full sample evaporation: Application to green tea.

Nobuo Ochiai et al.

Journal of chromatography. A, 1421, 103-113 (2015-08-16)

An extension of multi-volatile method (MVM) technology using the combination of a standard dynamic headspace (DHS) configuration, and a modified DHS configuration incorporating an additional vacuum module, was developed for milliliter injection volume of aqueous sample with full sample evaporation.

2- and 3-acetylpyrroles: a combined calorimetric and computational study.

Ana Filipa L O M Santos et al.

The journal of physical chemistry. A, 113(15), 3630-3638 (2009-03-27)

A combined experimental and computational study on the thermochemistry of 2- and 3-acetylpyrroles was performed. The enthalpies of combustion and sublimation were measured by static bomb combustion calorimetry and Knudsen effusion mass-loss technique, respectively, and the standard (p(o) = 0.1

Cycloaromatization approach to polysubstituted indolizines from 2-acetylpyrroles: decoration of the pyridine unit.

Jin Ho Lee et al.

The Journal of organic chemistry, 78(3), 1283-1288 (2013-01-08)

A new synthetic route to indolizines with various substituents on the pyridine moiety was developed by utilizing a facile cycloaromatization of 2-acetylpyrrole derivatives. Without isolation, the resulting intermediates were allowed to react with various electrophiles to afford a range of

Approaches of aroma extraction dilution analysis (AEDA) for headspace solid phase microextraction and gas chromatography-olfactometry (HS-SPME-GC-O): Altering sample amount, diluting the sample or adjusting split ratio?

Yunzi Feng et al.

Food chemistry, 187, 44-52 (2015-05-16)

Aroma extract dilution analysis (AEDA) is widely used for the screening of aroma-active compounds in gas chromatography-olfactometry (GC-O). In this study, three aroma dilution methods, (I) using different test sample volumes, (II) diluting samples, and (III) adjusting the GC injector

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