Abstract:
PURPOSE: A method for producing lipase using a buffer mixing system is provided to produce fixed lipase with high activity and high stability. CONSTITUTION: A lipase is fixed on a carrier by covalent bond in a buffer mixing system. The lipase is Candida rugosa lipase or Rhizopus oryzae lipase. Candida rugosa lipase or Rhizopus oryzae lipase are fixed at the same time at pH 6.0-7.0 and 0.2-0.3 M of ion strength for 20-30 hours.
Abstract:
A method for improving production yield of Saccharomyces cerevisiae JUL3 having beta-glucan is provided to mass produce Saccharomyces cerevisiae JUL3 inexpensively by using an inexpensive medium and optimizing process parameters, and increase the content of beta-glucan having high physiological activity in Saccharomyces cerevisiae JUL3. A method for improving production yield of Saccharomyces cerevisiae JUL3(KFCC 11359P) having abundant beta-glucan comprises the steps of: determining the optimum medium composition, wherein the optimum medium compositions are 5-7% molasses, 15-19% corn steep liquor, 0.3-0.7% KH2PO4, 0.05-0.15% MgSO4 and trace amount of minerals through response surface methodology as a statistical analysis method; comparing the cell production amount of Saccharomyces cerevisiae JUL3 in the optimum medium composition; determining the culture conditions, wherein the culture conditions are 200-400 rpm and 1-3 vvm in 2.5 liter fermenter, which are required for scale-up by using the optimum medium composition; and optimizing the substrate feed rate(10-20 ml/h) and concentration(30-75%) required for optimization of fed-batch culture under the optimum medium composition and culture conditions.
Abstract:
The present invention comprises: (a) a core unit formed by a combination of a magnetic substance and boron; (b) a silica shell unit embracing the core; (c) a surface part of an ultimate outskirt shell where the surface of the ultimate outskirt shell is reformed to a substituent selected from the groups of -NH2, -COOH, -NHS and -Biotin; and a magnetic core/shell nanoparticle consisting of an enzyme or a biomaterial fixated onto the surface part of the shell, and encapsulated by chitosan. According to the present invention, the encapsulated magnetic core/shell nanoparticle maintains the vitality of the enzyme or the biomaterial at a high standard even when re-used a number of times, and the structure of the enzyme or the biomaterial is stably protected.
Abstract:
PURPOSE: A microreactor for synthesizing lactulose and a method for preparing lactulose are provided to cheaply produce lactulose which is one of prebiotics by a reaction with a substrate containing fructose and whey using beta-galactosidase immobilized on the microreactor and to enable biological serial production. CONSTITUTION: A microreactor (11) for synthesizing lactulose contains beta-galactosidase which reacts to a substrate containing whey and fructose and is immobilized by multi-wall carbon nanotubes as a linking group. A method for producing lactulose comprises the steps of: preparing a reaction solution containing beta-galactosidase, a buffer solution, and whey; injecting the reaction solution and a solution containing the multi-wall carbon nanotubes into the microreactor to immobilize beta-galactosidase onto the microreactor; and injecting the substrate into the microreactor.