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Lactic acid was continuously produced from raw starch using a combination of a reversibly soluble-autoprecipitating amylase (D-AS) depending on pH and Lactobacillus casei entrapped in κ-carrageenan. Lactic acid was produced continuously by a novel reactor system, which consisted of a turbine-blade reactor with a cylindrical stainless steel net, a mixing vessel, and a separation vessel. The gel beads with entrapped lactic acid bacteria were held on the cylindrical net equipped in the main reactor throughout cultivation. D-AS was separated continuously from a solution containing lactic acid by self-sedimentation in the separation vessel and it was returned to the main reactor for repeated use. In the continuous lactic acid production from raw starch, the lactic acid productivity was 3.1 g/l/hr at a dilution rate (D) of 0.1 hr-1 and the value was about 3.1 times higher than the average of the repeated batches of lactic acid production. Although the enzymatic activity of D-AS is inactivated due to insolubiliz...

agricultural and biological chemistry

Continuous lactic acid production from raw starch in a fermentation system using a reversibly soluble-autoprecipitating amylase and immobilized cells of Lactobacillus casei.