Reduktiver abbau einer huminsäure-modellsubstanz: Nachweis der abbauprodukte mittels chromatographie

Helbig, B; Hartung, J. B.; Klöcking, R.; Sprössig, M; Gräser, H.

doi:10.1016/0016-7061(85)90006-0

Cited by 3 publications

(1 citation statement)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The saturation of aromatic compounds is well-documented in metallic reductions with the Birch method (34, 35) and other alkali metal methods (36). Helbig et al (37) found hydrocaffeic acid as a product of the sodium amalgam reduction of a caffeic acid polymer; this finding indicates that ar omatic saturation occurred in addition to fission.…”

Section: Alkali Metal Reduction Of Humic Materialsmentioning

confidence: 99%

Chemical Degradation of Humic Substances for Structural Characterization

Sonnenberg

Johnson

Christman

1988

Advances in Chemistry

View full text Add to dashboard Cite

Chemical degradations of humic substances are reviewed, with emphasis on the identity of the products and how these compounds relate to the overall structure of the humic macromolecule. The methods described include (1) reduction using metals, hydrogen, and metal hydrides; (2) oxidation with copper oxide, permanganate, and chlorine; and (3) alkaline hydrolysis. Experimental results are reported for the reductive and solvolytic degradation of isolated aquatic humic acid using metallic sodium dissolved in liquid ammonia. A number of highly oxygenated compounds, many that commonly result from oxidative procedures, are identified in the reduction mixture. The presence of these structures in the original humic macromolecule is suggested. DEGRADATIVE TECHNIQUES CAN BE EFFECTIVE TOOLS for structural elucidation of complex natural polymers (I). Prediction of the types of bondsthat are unstable to a particular method of degradation, coupled with identification and quantification of products, can indicate what substructures are included in the macromolecule and how they are linked together. Ideally, these techniques will produce untransformed subunits in a mechanistically predictable manner.Degradative methods have long been used to examine the subunits that exist in humic substances and their mode of attachment to the parent molecule. Aquatic humic material has been degraded hydrolytically and oxidatively by a variety of methods. However, because of the uncertainty about

show abstract

Section: Alkali Metal Reduction Of Humic Materialsmentioning

confidence: 99%