Screening of Lactobionic Acid Producing Microorganisms Hiromi
469 (J. Appl. Glycosci., Vol. 49, No. 4, p. 469-477 (2002)) Screening of Lactobionic Acid Producing Microorganisms Hiromi Murakami,* Jyunko Kawano,' Hajime Yoshizumi,' Hirofumi Nakano and Sumio Kitahata Osaka Municipal Technical Research Institute (1-6-50, Morinomiya, Joto-ku, Osaka 536-8553, Japan) 1Faculty of Agriculture, Kinki University (3327-204, Nakamachi, Nara 631-8505, Japan) Lactobionic acid (LA) is derived from lactose and expected to be a versatile material for grow- ing bifidobacterium and forming mineral salts with high solubility in water for supplements. We aimed to develop microbial or enzymatic production systems of LA. To this aim, we screened lactose-oxidizing microorganisms, and obtained a strain of Burkholderia cepacia. The lactose- oxidizing activity existed in the membrane fraction of disrupted cell preparation of the strain. Only oxygen was necessary for lactose-oxidizing activity as a proton acceptor. A crude cell-free enzyme preparation was prepared, and its oxidizing ability and other properties on several saccharides were examined. The cell-free preparation oxidized D-glucose, D-mannose, D-galactose, D-xylose, L- arabinose and D-ribose. It also reacted with lactose, cellobiose, maltose, maltotriose, maltotetaose and maltopentaose. The strain accumulated LA in the culture supernatant with no loss of lactose. The strain is advantageous to production of LA by both fermentation and enzymatic reaction. Lactose (Lac), one of the most common saccha- pergillus niger,6,7)Phanerochaete chrysosporium8) rides in dairy products, can be obtained easily and Penicillium chrysogenum .9) These strains and from cheese whey and casein whey, the large pool enzymes will not be used for LA production be- of unutilized resources.
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