title: Production of cyclodextrins from cornstarch granules in a sequential batch mode and in the presence of ethanol.
abstract: The influence of Toruzyme® cyclomaltodextrin glucanotransferase concentration and the presence of ethanol have been studied for the production of α-, β-, and γ-cyclodextrins (CDs) from 15% (w/v) cornstarch, at 65 °C and pH 6, with the aim of increasing CD yield. The selected concentrations for a single batch reactor were 10% (v/v) ethanol and 0.1% (v/v) enzyme, yielding after 12 h, 37% total CDs, of which 52.2% was α-CD, 38.8% β-CD, and 9.0% γ-CD. The enzyme specific activities per unit mass of protein for producing α-, β-, and γ-CD were 37.25, 19.61, and 8.63 U mg(-1), respectively. Total CD yield per milliliter of enzyme was 55 g. To increase CD yield per enzyme charge and thus reduce costs, the production of CDs was tested with two sequential batches in which a single enzyme charge was used. At the end of the first batch, the enzyme was adsorbed either on 65 °C pretreated starch granules or on raw starch, and a second batch was run with this material. The best result, in this case, was obtained for pretreated starch, increasing total CD produced by 57.4%, with 53.2% α-CD, 36.1% β-CD, and 10.7% γ-CD. CD yield per milliliter of enzyme was then 87 g.
authors.affiliation: Chemical Engineering Department, State University of Maringá, Av. Colombo, 5790-BL D-90, 87020-900 Maringá, PR, Brazil. luiza.calsavara@gmail.com
authors.forename: Luiza Pedrina Vilxenski
authors.initials: LP
authors.lastname: Calsavara
authors.forename: Alessandro Rogério
authors.initials: AR
authors.lastname: Dias da Cunha
authors.forename: Tiago Albertini
authors.initials: TA
authors.lastname: Balbino
authors.forename: Gisella Maria
authors.initials: GM
authors.lastname: Zanin
authors.forename: Flavio Faria
authors.initials: FF
authors.lastname: de Moraes
mesh_terms: D001426:Bacterial Proteins / Q000737:chemistry*; D055162:Biocatalysis; D019149:Bioreactors / Q000382:microbiology*; D003505:Cyclodextrins / Q000737:chemistry*; D000431:Ethanol / Q000737:chemistry*; D005964:Glucosyltransferases / Q000737:chemistry*; D007700:Kinetics; D013213:Starch / Q000737:chemistry*; D046968:Thermoanaerobacter / Q000201:enzymology*
chemical_list: D001426:Bacterial Proteins; D003505:Cyclodextrins; D000431:Ethanol; D013213:Starch; D005964:Glucosyltransferases; C019963:cyclomaltodextrin glucanotransferase