Abstract
A cell-bound cellobiose-oxidizing enzyme was produced by cellulolytic Cytophaga sp. LX-7. It was found that both the cellulosic substrates and the soluble carbohydrate substrates tested promoted the production of the cellobiose-oxidizing enzyme, and the highest specific activities were obtained with cellulose powder MN300, carboxy- methylcellulose CM22, maltose and cellobiose. Among the nitrogen sources examined, peptone gave the best cellobiose-oxidizing enzyme production, whereas inorganic nitrogen sources gave very poor growth. The medium buffered with Tris/HCl, pH 7.1, yielded the highest levels of cellobiose-oxidizing enzyme activity and the temperature optimum for crude enzyme activity was 40°C.
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