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Dive into the research topics where Yusaku Fujio is active.

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Featured researches published by Yusaku Fujio.


Starch-starke | 2000

Effect of organic nitrogen sources on raw starch-digesting glucoamylase production of Rhizopus sp. MKU 40

Hiroshi Morita; Yusaku Fujio

In a liquid cultivation of Rhizopus sp. MKU 40, supplementation of the medium with 1.5% (w/v) organic nitrogen sources (neopeptone, casein from milk, and meat extract) had a slightly positive effect on glucoamylase (GA) (EC 3.2.1.3) activity compared with the medium lacking organic nitrogen sources. The addition of organic nitrogen sources induced production of protease. Supplementation of the medium with 1.5% (w/v) organic nitrogen sources resulted in an acid and neutral protease activity of 11-25 U/mL and 12-20 U/mL, respectively. The co-existence of GA-I {a highly raw starch-digesting glucoamylase (RSDG)} and protease in the same medium leads to the production of Ga-II (an extremely weak RSDG) from GA-I. As a result the RSDG activity in the medium decreases. Raw starch adsorption rates of a medium without organic nitrogen sources were 100%, because the medium contained only GA-I. In contrast, the media supplemented with organic nitrogen sources had low starch adsorption rates because the media contained both GA-I and GA-II. The results presented in this paper indicate that supplementation of the culture medium of Rhizopus strains with organic nitrogen sources negatively affects GA-I production.


Starch-starke | 2001

Degradation Profiles of Potato Starch Melts Through a Capillary Tube Viscometer

Noriyuki Igura; Tatsuo Katoh; Isao Hayakawa; Yusaku Fujio

The effects of time-temperature and strain history on potato starch melts at 150 °C were investigated by use of a capillary tube viscometer. Reciprocating and single extrusions were performed in this study. Shear stress at single extrusion decreased gently as initial heating time increased, while shear stress at reciprocating extrusion decreased rapidly as the number of extrusion strokes increased. A high degree of cold water solubility was obtained by reciprocal extrusion at lower moisture content. From the results of gel filtration it could be concluded that starch molecules were depolymerized by high and reciprocal shear stress. According to these results time-temperature history was more effective on the depolymerization of starch molecules and degradation of starch granules at higher moisture content, while strain history was more effective at lower moisture content.


Journal of General and Applied Microbiology | 1993

Polygalacturonase production by Rhizopus spp

Francisco B. Elegado; Yusaku Fujio


Journal of The Faculty of Agriculture Kyushu University | 1990

Development and Evaluation of an Extrusion Viscometer for Polymer Melt

Nobuyuki Hayashi; Isao Hayakawa; Yusaku Fujio; 信行 林; 功 早川; 雄策 藤尾


Mycoscience | 2002

Ribonuclease production of Rhizopus oryzae IFO 4697 under metal ion stress in liquid culture

Hiroshi Morita; Masami Shiozawa; Yusaku Fujio


Journal of General and Applied Microbiology | 1999

Polygalacturonase production of Rhizopus sp. MKU 18 using a metal-ion-regulated liquid medium

Hiroshi Morita; Yusaku Fujio


Journal of the Faculty of Agriculture | 1993

Plasticization of Wheat Starch-Gluten Mixture under an Elevated Temperature

Jae-Kag Lim; Nobuyuki Hayashi; Hiroyuki Matsuo; Isao Hayakawa; Yusaku Fujio


Journal of The Faculty of Agriculture Kyushu University | 1993

Some Properties of Polygalacturonase from Rhizopus japonicus IF0 5318

Chortip Lorrungruang; Francisco B. Elegado; Yusaku Fujio; 雄策 藤尾


Journal of Fermentation and Bioengineering | 1991

Principal Component Analysis of Aroma Profiles of Tempeh Produced by Using Various Starters

Supriyanto; Kouji Wada; Isao Hayakawa; Yusaku Fujio


Journal of The Faculty of Agriculture Kyushu University | 1990

Flow Patterns in Soybean Protein Isolate Melt in the Reservoir of an Extrusion Viscometer

Nobuyuki Hayashi; Isao Hayakawa; Yusaku Fujio; 信行 林; 功 早川; 雄策 藤尾

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Hiroshi Morita

University of Kitakyushu

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