Direct fermentation production L-(+)-lactic acid from potato starch using composite fungi Rhizopus oryze
This study describes factors for direct L-(+)-lactic acid production from potato starch by Rhizopus oryze AS3.819/3.851 and optimum conditions for direct fermentation using uncooked potato starch as substrates. The productivity was found to be affected by four factors: (1) culture pH control (influence selective production of L-(+)-lactic acid), (2) inoculation amount of spore (effective accumulation of product and avoid overgrowth of biological population), (3) phytic acid and its concentration in medium that improved in production rate and yield of L-(+)-lactic acid. The optimum fermentation pH for the direct and effective fermentation from potato starch substrate was 5.2 based on the yield of L-(+)-lactic acid. Under these conditions, the average L (+)-lactic acid output rate is 12 ％ from uncooked potato starch by Rhizopus oryze AS3.819/3.851fermentation. Furthermore, the addition of phytic acid stimulated the direct fermentation significantly, and enabled complete bioconversion within 105 h.
L-(+)-lactic acid fermentation potato starch composite fungi Rhizopus oryze phytic acid
Gaofeng Shi Guoying Wang Chunlei Li Chenxue Fu Qingning Wang
College of Petroleum and Chemical Engineering, Lanzhou University of Technology, Lanzhou 730050, PR China
国际会议
第四届中日化工学术研讨会(The 4th Joint China/Japan Chemical Engineering Symposium)(CJCES)
成都
英文
2007-12-19（万方平台首次上网日期，不代表论文的发表时间）