Humin

For other uses, see Humin (disambiguation).

Humins are a class of organic compounds that are insoluble in water at all pH's. The term is used in two related contexts, in soil chemistry and saccharide chemistry. These dark brown solids are inhomogenous and their structures are often vaguely described.

Soil consists of both mineral (inorganic) and organic components. The organic components can be subdivided into fractions that are soluble, largely humic acids, and insoluble, the humins. Humins comprise about 50% of the organic matter in soil.[1]

Humins also produced during the dehydration of sugars, as is conducted in the conversion of cellulose to smaller organic compounds. These humins arise by the condensation of sugars with furfural and hydroxymethylfurfural, products of the dehydration of pentoses and hexoses. Since they are generally undesirable for chemical purposes, efforts are made to avoid their formation. Otherwise, humins are used for fuel.[2]

See also

References

  1. ↑ Rice, James A. "Humin" Soil Science 2001, vol. 166(11), pp. 848-857. doi:10.1097/00010694-200111000-00002
  2. ↑ van Putten, R.-J., van der Waal, J. C., de Jong, E., Rasrendra, C. B., Heeres, H. J.,de Vries, J. G., "Hydroxymethylfurfural, A Versatile Platform Chemical Made from Renewable Resources", Chem. Rev. 2013, 113, 1499. doi:10.1021/cr300182k

See also

Singer, Michael J., and Donald N. Munns. Soils An Introduction (6th Edition). Upper Saddle River: Prentice Hall, 2005. ISBN 978-0-13-119019-1


This article is issued from Wikipedia - version of the Sunday, July 27, 2014. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.