Ethanol Production from Sunflower Seed Hull Hydrolysate by Pichia stipitis under Uncontrolled pH Conditions in a Bioreactor

Authors : Müjgan TELLI OKUR, Nurdan EKEN SARAÇOĞLU

Pages : 317-322

Doi:10.3906/sag-1208-1

View : 14 | Download : 6

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Ethanol production from sunflower seed hull hydrolysate was evaluated using Pichia stipitis NRRL Y-7124 in this study. The hydrolysate was prepared with 0.7 M H2SO4 and a solid/liquid ratio of 1/5 insert ignore into journalissuearticles values(w/v); at 90 °C. Fermentation of detoxified hydrolysate was carried out in a batch bioreactor system under uncontrolled pH operation at initial pH of 6 at 30 °C. The influence of different aeration rates on the fermentability of hydrolysates was investigated. The highest ethanol accumulation, 9.66 g l-1, and a yield of 0.41 g g-1 were achieved at the lowest tested flow rate, 2.28 vv-1 min-1, from 35 g reducing sugar l-1.
Keywords : Ethanol, Fermentation, Hydrolysate, Pichia stipitis, Sunflower seed hull