反应详情

The same medium and parameters as the inoculum were used. A 500 ml flask containing 100 ml broth was sterilized for 20 min. at 121° C. A 2.5 ml aliquot of sterilized 20% sodium butyrate solution (pH 7.0) and 1 ml. of the 24 hours grown culture were added. The flask was incubated at 30° C. and 150 rpm for 24 hours. Sterile 10% sodium cinnamate (pH 7.0) was added to each flask as follows: 5 g/l at 24 hours, 4 g/l at 72 hours, and 6 g/l at 80 hours. Periodically, 2 ml. samples of broth were acidified to pH 4.0 using 50% sulfuric acid, extracted with an equal volume of ethyl acetate, and analyzed by GC. The acetophenone concentration was estimated by external standard. At the conclusion of the fermentation, the culture broth was acidified to pH 4 as above and extracted twice with 1/2 volume of ethyl acetate each time. The extracts were combined and solvent was removed under vacuum using a rotary evaporator. The crude product was distilled in a micro-distillation oven and the distillate analyzed by GC. The yield of 1.8 g/L having a purity of 94.3% was obtained.

1. additionA 500 ml flask containing 100 ml
2. customof the 24 hours
3. additionwere added
4. customwas incubated at 30° C.
5. wait150 rpm for 24 hours
6. wait5 g/l at 24 hours
7. wait4 g/l at 72 hours
8. wait6 g/l at 80 hours
9. extractionextracted with an equal volume of ethyl acetate
10. concentrationThe acetophenone concentration
11. extractionextracted twice with 1/2 volume of ethyl acetate each time
12. customsolvent was removed under vacuum
13. customa rotary evaporator
14. distillationThe crude product was distilled in a micro-distillation oven
15. customwas obtained