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Aureobasidum pullulans 의 포도당전이활성에 의한 맥아당으로부터 이소말토올리고당 생산의 속도론적 고찰 및 수학적 모델
윤종원,서정호,송승구 ( Jong Won Yun,Jung Ho Suh,Seung Koo Song ) 한국화학공학회 1994 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.32 No.6
A mathematical model for the production of isomalto-oligosaccharides from maltose by transglucosylation reaction of Aureobasidium pullulans was proposed based on the kinetic study, and the predicted values were compared with the experimental results for two maltose concentrations. The formation of isomalto-oligosaccharides occurred from a consecutive set of disproportionation reactions(viz. G_n+G_n→G_(n-1)+G_(n+1)). The Michaelis-Menten constants for maltose and panose were 154.5 g/ℓ and 55.6 g/ℓ, respectively at 50℃. Competitive inhibition by glucose and panose was observed from kinetic analysis for the substrate maltose where the inhibition constants were 15.3 g/ℓ, 9.8 g/ℓ, respectively. In a similar manner, glucose was also proved a competitive inhibitor when panose was used as substrate, in which the inhibition constant was found to be 6.3 g/ℓ. The predicted carbohydrate profiles of the proposed model gave good agreements with the experimental results.
Amyloglucosidase 에 의한 Fructo - oligosaccharides 생산의 반응메카니즘
윤종원,이민규,송승구 ( Jong Won Yun,Min Gyu Lee,Seung Koo Song ) 한국화학공학회 1994 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.32 No.4
A mathematical model for the production of fructooligosaccharides by amyloglucosidase was proposed and compared with experimental results. The reaction mechanism of amyloglucosidase in fructooligosaccharides production was very similar to that of fructosyltransferase except that fructose was accumulated at a high level. The kinetic parameters such as Michaelis constants(K_m) and inhibition constant(K_l) were higher, whereas maximum reaction velocities(V_(max)) were low compared with those of fructosyltransferase. Although data points were scattered for profiles of sucrose and 1-kestose to some extent, good agreement was generally found between the proposed model and experimental results.
Fructosyltransferase 와 Glucose isomerase 혼합효소계를 이용한 프락토 올리고당의 생산
윤종원,노지선,이민규,송승구 ( Jong Won Yun,Ji Seon Noh,Min Gyu Lee,Seung Koo Song ) 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.6
The production of fructo-oligosaccharides having new composition was investigated using the mixed-enzyme system of fructosyltransferase and glucose isomerase. Despite of decrease in glucose concentration which acts as an inhibitor of fructosyltransferase during the production of fructo-oligosaccharides, the concentration of fructo-oligosaccharides was not high due to the altered kinetic parameters in the mixed-enzyme system. To confirm these results, a mathematical model for the mixed-enzyme system was proposed and compared with the experimental results, which showed good agreement with experimental data. Surprisingly, the K_m values and inhibition constant of glucose(K_(iG)) for fructosyltransferase in the mixed-enzyme system were different from those of fructosyltransferase alone. The fructose isomerized from glucose by glucose isomerase did not act as a sucrose acceptor, which meant the isomerized fructose did not play a part in the production of fructo-oligosaccharides.