Methoxyl groups of plant pectin as a precursor compound for atmospheric methane: evidence from deuterium labelling studies
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DEUTERIUM STUDIES IN THE DISPROPORTIONATION OF THIOXANTHYLIUM SALTS
Deuterium labelling is used to show that the disproportionation of thioxanthylium salts involve transfer of a hydride, (deuteride) ion from the9-positionof one molecule of the compound, as its hydro], to the 9 - position of another molecule in the cation form
متن کاملCarbon isotope anomaly in the major plant C1 pool and its global biogeochemical implications
We report that the most abundant C1 units of terrestrial plants, the methoxyl groups of pectin and lignin, have a unique carbon isotope signature exceptionally depleted in 13C. Plant-derived C1 volatile organic compounds (VOCs) are also anomalously depleted in 13C compared with Cn+1 VOCs. The results confirm that the plant methoxyl pool is the predominant source of biospheric C1 compounds of pl...
متن کاملA Study on Plant Polymer: Pectin Production and Modification (RESEARCH NOTE)
Abstract Pectin from two different plant sources: apple and sugar beet was studied. Apple pectinwas modified by chemical treatments such as: acid, alkali and ammonia, so as to obtain an ester levelequal to or less than 50 %, which is described as low methoxyl (LM) pectin. LM pectin form gelswith significant characteristic. In this study, de-esterification of apple pectin with acid treatmentresu...
متن کاملEffect of Ultrasound Time and Acid Type on the Qualitative Properties of Extracted High Methoxyl Pectin from Quince Fruit
Background and Objectives: Pectin is a complex mixture of polysaccharides that is widely used in the food industry as a gelling agent, stabilizer and emulsifier. The aim of this study was to investigate the efficiency and physicochemical properties of extracted pectin from quince fruit using ultrasound. Materials & Methods: Pectin was extracted by ultrasound under the power of 320 W, two typ...
متن کاملMethanol production from the degradation of pectin by human colonic bacteria.
When ingested, pectin can lower serum cholesterol levels in humans. Pectin is degraded by fecal bacteria in the colon. We examined the release of methanol (MeOH) by this degradation. A 0.2% glucose (2 g/L) mixture was used as the control medium. A pure culture of pectinolytic Erwinia carotovora was the control bacterium. The chief substrates were, in set 1, 0.2% pectin (2 g/L) and, in set 2, 0....
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تاریخ انتشار 2008