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Any one of a class of carbohydrates containing five atoms of carbon.



a monosaccharide that contains five carbon atoms per molecule. In nature, pentoses do not occur in the free state but are present in various glycosides and polysaccharides that are commonly found in plants; these include arabinose and xylose. The pentoses ribose and 2-deoxyribose are constituents of nucleic acids. Nucleoside-diphosphate sugars participate in the insertion of arabinose and xylose into complex carbohydrates. Ribose in the form of ribose-5-phosphate, which takes part in the biosynthesis of nucleotides, is formed as an intermediate product in photosynthesis and in the pentose-phosphate cycle. Pentoses are converted by mineral acids into furfurol, a valuable raw material in the chemical industry.

References in periodicals archive ?
Competition between pentoses and glucose during uptake and catabolism in recombinant Saccharomyces cerevisiae.
As pesquisas sobre os derivados de hexoses e pentoses tem aumentado muito desde 2004, quando um relatorio do Departamento de Energia dos EUA [40] identificou uma plataforma contendo 12 moleculas derivadas de carboidratos e seus possiveis derivados [1,4-diacidos contendo quatro atomos de carbono: acido succinico, acido fumarico e acido malico, acido 2,5-dicarboxilico furano (FDCA), acido 3-hidroxipropionico, acido aspartico, acido glucarico, acido glutamico, acido itaconico, acido levulinico, 3-hidroxibutirolactona, glicerol, sorbitol, e os alcoois derivados da xilose e da arabinose (xilitol e arabinitol)].
63) The new variant of SSF is simultaneous saccharification and co-fermentation (SSCF), wherein both pentoses and hexoses are simultaneously fermented into ethanol.
Alternative approach for utilization of pentose stream from sugarcane bagasse by an induced flocculent Pichia stipitis.
At the moment there is a lack of microbes that will efficiently convert both hexoses and pentoses into ethanol," explained Dr Weber.
Metallic catalysts have been reported as enhancers to the production of furfural, they may act as Lewis acids promoting the reaction or may stabilize the intermediates in the dehydrocyclization of pentoses.
Hemicelluloses are mixtures of pentoses and hexoses.
05 Soil depth Total Percentage Pentoses (m) sugars of total C Gallery forest 0-0.
COMPOUND CONSTITUENTS MONOSACCHARIDES Monosaccharides Pentoses (5-C sugars) Arabinose Xylose Ribose Hexoses (6-C sugars) Glucose Fructose Galactose Mannose Disaccharides Sucrose Glucose-fructose Maltose Glucose-glucose Lactose Glucose-galactose Trisaccharides Raffinose Glucose-fructose- galactose Polysaccharides Pentosans Araban Arabinose Xylan Xylose Hexosans Starcha Glucose Celluloseb Glucose Glycogen Glucose Insulin Fructose Mixed Polysaccharides Hemicellulose Mixtures of pentoses and hexoses Pectins Pentoses and hexoses mixed with salts of complex acids Gums Pentoses and hexoses Oligosaccharides (c) Fructo- and galacto- Monosaccharide oligosaccharides, units, 3 to 9 (e.
Initially described as a product of the reaction of pentoses with proteins [1], it was later shown to be derived as well from glucose under physiological conditions of pH and temperature, provided that the reaction occurred in the presence of oxygen and traces of transition metals (oxidative conditions) [2].