title: Continuous production of cyclodextrins in an ultrafiltration membrane reactor, catalyzed by cyclodextrin glycosyltransferase from Bacillus circulans DF 9R.
abstract: Cyclodextrins (CDs) are cyclic oligosaccharides of wide industrial application, whose synthesis is catalyzed by Cyclodextrin glycosyltransferase (CGTase) from starch. Here, CDs were produced using CGTase from Bacillus circulans DF 9R in continuous process and an ultrafiltration membrane reactor. The batch process was conducted as a control. This method allowed increasing the yield from 40 to 55.6% and the productivity from 26.1 to 99.5 mg of CD per unit of enzyme. The method also allowed obtaining a high-purity product. The flow rate remained at 50% of its initial value after 24 h of process, improving the results described in the literature for starch hydrolysis processes. CGTase remained active throughout the process, which could be explained by the protective effect of the substrate and reaction products on CGTase stability. In addition, batch processes were developed using starches from different sources. We concluded that any of the starches studied could be used as substrate for CD production with similar yields and product specificity.
authors.affiliation: Dept. de Ciencias Básicas, Universidad Nacional de Luján, Luján (6700), Buenos Aires, República Argentina.
authors.forename: Jorgelina A
authors.initials: JA
authors.lastname: Rodríguez Gastón
authors.affiliation: Dept. de Ciencias Básicas, Universidad Nacional de Luján, Luján (6700), Buenos Aires, República Argentina.
authors.forename: Hernán
authors.initials: H
authors.lastname: Costa
authors.affiliation: Dept. de Ciencias Básicas, Universidad Nacional de Luján, Luján (6700), Buenos Aires, República Argentina.
authors.forename: Susana A
authors.identifier: http://orcid.org/0000-0002-3013-0055
authors.initials: SA
authors.lastname: Ferrarotti
mesh_terms: D001407:Bacillus / Q000201:enzymology*; D019149:Bioreactors; D002384:Catalysis; D003505:Cyclodextrins / Q000096:biosynthesis*; D005964:Glucosyltransferases / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D013213:Starch / Q000737:chemistry; D013379:Substrate Specificity; D014462:Ultrafiltration
chemical_list: D003505:Cyclodextrins; D013213:Starch; D005964:Glucosyltransferases; C019963:cyclomaltodextrin glucanotransferase
keywords: Bacillus circulans; cyclodextrin glycosyltransferase; cyclodextrins; starch conversion; ultrafiltration membrane reactor