L-Leucine → L-Isoleucine

Participants

Reaction Conditions

Reaction Steps

In each case, 10 ml of Caso broth containing 0.5% glucose were inoculated with 100 μl of a bacterial culture from example 10 (ATCC 14310 derivatives) in a conical flask with baffles (volume: 100 ml) and shaken at 200 rpm by way of a preculture at 33° C. for 16 h (amplitude: 5 cm). From the preculture, 10 ml of main culture in each of three 100 ml conical flasks with baffles were inoculated with an inoculation volume of 1%. A medium containing 40 g of glucose, 20 g of ammonium sulphate, 0.5 g of potassium dihydrogen phosphate, 0.5 g of dipotassium hydrogen phosphate, 20 g of calcium carbonate, 0.25 g of magnesium sulphate (heptahydrate), 10 mg of iron sulphate (heptahydrate), 10 mg of manganese sulphate (×4H2O), 1 mg of zinc sulphate (heptahydrate), 0.2 mg of copper sulphate and 300 mg/l of L-leucine was used for the main culture. The main culture was incubated at 33° C. and a shaker speed of 200 rpm (amplitude: 5 cm) for 48 h. The culture fluid obtained was removed by centrifugation and the concentration of isoleucine was subsequently determined in the supernatant. Table 4 depicts the results.

Provenance & Evidence