Isomerization and hydrolysis reactions of important disaccharides over inorganic heterogeneous catalysts
作者:Rajesh Shukla、Xenophon E. Verykios、Rajakkannu Mutharasan
DOI:10.1016/s0008-6215(00)90699-2
日期:1985.11
that reaction routes consist of parallel hydrolysis and isomerization of the disaccharides to their corresponding ketoses, followed by hydrolysis of the ketoses. Approximately 10–13% of the disaccharide reacted is not accounted for in the product distribution, indicating that degradation reactions occur, probably in the alkaline broth of the mixtures.
The present invention has objects to provide a thermostable cellobiose 2-epimerase, its preparation and uses. The present invention attains the above objects by providing a thermostable cellobiose 2-epimerase, a DNA encoding the enzyme, a recombinant DNA and transformant comprising the DNA, a process for producing the enzyme, and a process for producing isomerized saccharides using the enzyme.
Procédé de préparation de maltulose monohydrate cristallisé
申请人:Roquette Frères
公开号:EP0957106A1
公开(公告)日:1999-11-17
L'invention concerne un procédé de préparation de maltulose monohydrate cristallisé, caractérisé par le fait qu'il comporte les étapes suivantes :
préparation d'une solution aqueuse de maltulose d'une richesse supérieure à 65% en poids,
concentration de la solution aqueuse de maltulose à une matière sèche supérieure à 50 % en poids et à une température telle que le degré de sursaturation du maltulose soit inférieur à 1,
refroidissement de ladite solution concentrée de manière à porter le degré de sursaturation du maltulose à une valeur supérieure à 1,
cristallisation du maltulose dans ladite solution sursaturée, en la refroidissant à vitesse contrôlée et sous agitation, et
séparation, récupération et séchage des cristaux de maltulose monohydrate ainsi obtenus.
Expression of granular starch hydrolyzing enzymes in Trichoderma and process for producing glucose from granular starch substrates
申请人:Genencor International, Inc.
公开号:EP1698692A2
公开(公告)日:2006-09-06
The present invention relates to filamentous fungal host cells and particularly Trichoderma host cells useful for the production of heterologous granular starch hydrolyzing enzymes having glucoamylase activity (GSHE). Further the invention relates to a method for producing a glucose syrup comprising contacting a granular starch slurry obtained from a granular starch substrate simultaneously with an alpha amylase and a GSHE at a temperature equal to or below the gelatinization temperature of the granular starch to obtain a composition of a glucose syrup.