• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

1990 Fiscal Year Final Research Report Summary

Development and Application of Successive Production of Branched Cyclodextrins Using a Reactor

Research Project

Project/Area Number 01860016
Research Category

Grant-in-Aid for Developmental Scientific Research (B).

Allocation TypeSingle-year Grants
Research Field 製造化学・食品
Research InstitutionTokyo University of Agriculture and Technology, Faculty of Agriculture

Principal Investigator

SAKANO Yoshiyuki  Tokyo University of Agriculture and Technology, Faculty of Agriculture, Associate Professor, 農学部, 助教授 (70014959)

Co-Investigator(Kenkyū-buntansha) KUSANO Shuーichi  Nikken Chemicals Co. Ltd., Ohmiya Research Laboratory, Research Chemist, 大宮研究所, 研究員
SHIRAISHI Takanori  Nikken Chemicals Co. Ltd., Ohmiya Research Laboratory, Senior Research Chemist, 大宮研究所, 主任研究員
FUJIMOTO Daisaburo  Tokyo University of Agriculture and Technology, Faculty of Agriculture, Professo, 農学部, 教授 (40004288)
KOGURE Yasuo  Nikken Kasei Co. Ltd, General Affairs Division, Section Manager
Project Period (FY) 1989 – 1990
KeywordsBacillus acidopullulyticus / pullulanase / reactor / immobilization / branched cyclodxtrin / inclusion / ceramics / sugar alcohol
Research Abstract

The method of enzymic synthesis of branched cyclodextrins (BrーCDs) using the reverse reaction of Bacillus acidopullulyticus Pullulanase was established. More than 40 % of CDs were converted to Br-CDs from to the corresponding CDs used as substrates under the conditions as follows : the coubined concentration of CD and maltose, 70-75 % ; the molar ration of maltose to CD, 9-18 ; the amount of pullulanase, 100-200 units/g of CD ; pH and temperature, 4-4.5 and 60-70 ^゚C. The enzyme was immobilized easily on carriers (glass beads, ceramics, ionic exchanges, and chitosan beads, etc.) by physical adsorption, ionーbinding, and cross linkages, etc ; especially the enzyme was supported on SM 10 carrier (a kind of ceramic) with the highest activity in tested carriers. The column reactors (1.1-1.6 X 16-20 cm) were prepared with the immobilized enzyme preparations and the successive production of Br-CDs from CD and maltose were compared. SM 10 column reactor had remarkably high activity as well as stable ; the activity of this reactor hardly deceased after 1000 hr operation at 60 ^゚C. B. acidopullulyticus pullulanase was more stable than other pullulanases from Klebsiella pneumoniae and Bacillus sectorramus, etc. Moreover B. acidopullulyticus Pullulanase was remarkably stabilized under high concentration of sugar alcohols (maltitol, maltotriitol, maltotraitol, or maltopentaitol) and the thermal stability increased with the length of the sugar alcohols. This result indicates that this enzyme is particularly suitable for synthesis of BrーCDs. Generally the solubility of CD in water is not so high, 14.5 (alpha ーCD), 1.85(beta ーCD), and 23.2 (gamma -CD) g per 100g of water. The solubility of Br-CDs increased ; especially the solubility of Br- beta -CD was more than 100-fold of betaーCD. BrーCDs could stabilize labile compounds, emulsify oils, mask flavours of odors, increase solubility and convert viscous to oily compounds into powders similat to CDs.

URL: 

Published: 1993-08-12  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi