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XYLAN [8 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2012-10-22

English

Subject field(s)
  • Biochemistry
  • Food Additives
  • Pulp Preparation (papermaking)
DEF

A type of polysaccharide found in plant cell walls in association with cellulose and lignin; it is soluble and extractable by dilute alkaline solutions.

CONT

The hemicellulose units are distinguished analytically from cellulose by the greater ease of hydrolysis in hot dilute acids and by solubility in aqueous alkaline solutions. Pulping and bleaching are normally done at conditions which maximize retention of hemicelluloses because they promote inter-fibre bonding and strengthen paper... The principal hemicelluloses are xylan in hardwoods and glucomannan in softwoods.

French

Domaine(s)
  • Biochimie
  • Additifs alimentaires
  • Préparation de la pâte à papier
DEF

Composé glucidique (gommes et mucilages, par exemple), hydrolysable en milieu acide, faisant partie de la membrane cellulaire des végétaux supérieurs. Sa solubilité en milieu alcalin la distingue des celluloses.

Spanish

Campo(s) temático(s)
  • Bioquímica
  • Aditivos alimentarios
  • Preparación de la pasta (fabricación de papel)
DEF

Cualquier carbohidrato de tipo celulósico, excepto la celulosa misma.

CONT

Junto con la pectina y la lignina, la hemicelulosa forma parte de la matriz de la pared celular.

OBS

Celulosa con un grado de polimerización de 150 o menos. Es un término colectivo para celulosas beta y gamma.

Save record 1

Record 2 2003-04-24

English

Subject field(s)
  • Food Additives
  • Biochemistry
DEF

A hemicellulose present in cereal, straws, brans, and other woody plant tissues; yields five-carbon-atoms sugars.

CONT

... the pentosan xylan yields the sugar xylose... which is dehydrated with sulfuric acid to yield furfural...

French

Domaine(s)
  • Additifs alimentaires
  • Biochimie
DEF

Polysaccharide présent dans les céréales, les gommes végétales, le son et divers tissus ligneux.

OBS

Surtout utilisé en panification.

Spanish

Campo(s) temático(s)
  • Aditivos alimentarios
  • Bioquímica
Save record 2

Record 3 1998-11-16

English

Subject field(s)
  • Biochemistry
  • Pulp Preparation (papermaking)
CONT

Enzyme. Complex organic material used to catalyze a reaction or increase its rate. Commonly refers to xylanase(which cleaves linkages in xylan) or ligninase(which cleaves linkages in lignin) or related enzymes used as a bleaching pre-treatment.

French

Domaine(s)
  • Biochimie
  • Préparation de la pâte à papier
CONT

Deux types d'enzymes sont présentement employés ou à l'étude. La xylanase qui hydrolyse des liens dans les xylanes et la ligninase qui coupe des liens dans la lignine.

Spanish

Save record 3

Record 4 1998-11-16

English

Subject field(s)
  • Biochemistry
  • Pulp Preparation (papermaking)
CONT

Enzyme. Complex organic material used to catalyze a reaction or increase its rate. Commonly refers to xylanase(which cleaves linkages in xylan) or ligninase(which cleaves linkages in lignin) or related enzymes used as a bleaching pre-treatment.

French

Domaine(s)
  • Biochimie
  • Préparation de la pâte à papier
CONT

Deux types d'enzymes sont présentement employés ou à l'étude. La xylanase qui hydrolyse des liens dans les xylanes et la ligninase qui coupe des liens dans la lignine.

CONT

Les xylanases, dans la vaste famille des hémicellulases, sont les principales responsables du blanchiment [enzymatique] de la pâte à papier.

Spanish

Save record 4

Record 5 1998-09-22

English

Subject field(s)
  • Biochemistry
  • Biotechnology
CONT

The "isomerase cake" and details or operation are being marketed by Nagasi and Co. Ltd, Japan. The Japanese process uses enzymes known as glucose isomerases.... these are xylose isomerases adapted to use glucose. The organisms are cultivated in a medium containing xylose or xylan.

French

Domaine(s)
  • Biochimie
  • Biotechnologie
OBS

Isomérase : Enzyme qui catalyse des réarrangements intramoléculaires.

Spanish

Campo(s) temático(s)
  • Bioquímica
  • Biotecnología
Save record 5

Record 6 1997-05-21

English

Subject field(s)
  • Biotechnology
  • RBB-xylan
OBS

Oleosin-xylanase C oil bodies were incubated with a chromogenic xylan substrate(RBB-xylan). [Source : ethanol project-Canleth1. en p. 2].

French

Domaine(s)
  • Biotechnologie
OBS

Des corps lipidiques renfermant la protéine hybride oléosine-xylanase c ont été incubés avec un substrat à base de xylane chromogène (xylane-RBB). [Source: projet éthanol - Canleth1.fr p. 2].

OBS

Selon Rolf Morosoli, chercheur à l'Institut Armand-Frappier, les chercheurs utilisent l'équivalent anglais RBB.

Spanish

Save record 6

Record 7 1992-07-03

English

Subject field(s)
  • Chemical Engineering
  • Wood Products
  • Biomass Energy
CONT

Depending upon the wood species used, the kraft process produces araboxylan from coniferous woods and xylan from deciduous woods.... When the cook is preceded by a hydrolysis the pulp from both wood species contains only xylan.

French

Domaine(s)
  • Génie chimique
  • Produits du bois
  • Énergie de la biomasse
DEF

Produit chimique obtenu des essences résineuses à la suite du procédé kraft de fabrication de la pâte à papier.

Spanish

Save record 7

Record 8 1976-06-19

English

Subject field(s)
  • Chemistry
OBS

pentosan : any of a class of polysaccharides(as xylan or araban) that yield only pentoses on hydrolysis and that are widely distributed in plants(as in corncobs...)(Webster's Third New Int. Dict.) Rens. Section ACDI

French

Domaine(s)
  • Chimie
OBS

D'après Sobecka, Z., Dictionary of Chemistry and Chemical Technology in 6 languages, Warsaw, 1966

Spanish

Save record 8

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