Pepper - chemistry, technology, and quality evaluation.
Pepper is the most important of the spices, with a long history. This article critically reviews our knowledge of the chemistry, processing, and quality evaluation of the product, with emphasis on the constituents contributing to the sensory properties of the spice for which it is valued in food. Other areas briefly summarized include its history, horticultural aspects, production and trade data, and physiological effects. Allied spices and aromatic members of the same family are also considered briefly.
Constituents of peppers
SummaryThin layer and high pressure liquid chromatography techniques are described for the analysis of piperine and its trans-cis isomers isopiperine, isochavicine and chavicine. U. V. irradiation of piperine produces isochavicine. Synthesis of piperine and its isomers by reacting piperidine with the corresponding acid chlorides leads to mixtures of the isomers.ZusammenfassungEs wird die dünnschicht-chromatographische und die Hochdruck-LLC-Analyse von Piperin sowie seinen cis-trans-Isomeren iso-Piperin, iso-Chavicin beschrieben. Durch UV-Bestrahlung entsteht aus Piperin iso-Chavicin. Bei der Synthese von Piperin und seinen Isomeren durch Umsetzung von Piperidin mit den korrespondierenden Säurechloriden entstehen Isomerengemische.RésuméL'analyse par chromatographie sur couche mince et par chromatographie en phase liquide sous haute pression de la pipérine et de ses isomères l'isopiperine, l'isochavicine et la chavicine est décrite. La pipérine est transformée en isochavicine par irradiation en lumière ultra-violette. La réaction de la pipéridine avec chacun des chlorures acides isomères donne un mélange d'isomères.
Chromatography of methylenedioxyphenyl compounds. I. Simple and pesticidal derivatives.
Abstract Chromatographic analysis has played an important role in the elaboration of metabolism, degradation and mode of action of a variety of methylenedioxyphenyl derivatives. Thin-layer and gas chromatography have been singularly effective in the separation and identification of isomeric mixtures as well as elaborating the influence of substituents on the basic methylenedioxy moiety to chromatographic behavior. A variety of chromatographic techniques undoubtedly will be in the forefront of attempts to further elaborate the possible dichotomy of action of the methylene-dioxyphenyl synergists 60,122 .