Although arabinose isomerase (E.C. 18.104.22.168), a commercial enzyme for edible tagatose bioconversion, can be expressed in an Escherichia coli system, this expression system might leave noxious by-products in food. To develop an eligible tagatose bioconversion with food-safe system, we compared the tagatose production activity of immobilized arabinose isomerase expressed in Bacillus subtilis (a host generally recognized as safe) with that of the enzyme expressed in E. coli. A 48% increase in tagatose production (4.3 g tagatose/L at 69.4 mg/L·hr) was found using the B. subtilis-expressed immobilized enzyme system, compared to the E. coli-expressed enzyme system (2.9 g tagatose/L). The increased productivity with safety of the B. subtilis-expressed arabinose isomerase suggests that it is a more eligible candidate for commercial tagatose production.
|Number of pages||4|
|Journal||Food Science and Biotechnology|
|Publication status||Published - 2008 Aug 22|
All Science Journal Classification (ASJC) codes
- Food Science
- Applied Microbiology and Biotechnology