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Because of its excellent capability in grease synthesis and accumulation, Rhodotorula glutinis is a good candidate to produce microbial oil by molasses fermentation. The influencing factors, such as culture volume, pH value, inoculum concentration, temperature, nitrogen and carbon nutrition, were investigated by batch cultures. The results indicate that a dry-cell yield of 2.42g/L and a grease yield of 0.8g/L are obtained after fermenting for 132h with an initial COD concentration of 11100mg/L, pH value of 6.5, temperature of 30℃ and swing at 160r/min. The corresponding specific dry-cell and grease yield by COD removal are 0.35 and 0.12kg/kg, respectively. The dry-cell yield and grease yield could be increased to 3.74 and 1.31g/L, respectively, by adding 10g/L glucose instantly at a certain fermentation moment. 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科技导报
| 研究论文 2010, 28(20): 77-81
Rhodotorula glutinis发酵糖蜜产油脂影响因素研究
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李建政,王 茜,班巧英
作者信息
哈尔滨工业大学城市水资源与水环境国家重点实验室;市政环境工程学院,哈尔滨 150001
通讯作者:
李建政
Influencing Factors in Molass Fermentation by Rhodotorula glutinis for Microbial Oil Production
Affiliations
出版时间: 2010-10-28
文章导航
微生物油脂生产是解决生物柴油原料问题的重要途径之一。本文以制糖厂废糖蜜为原料,通过间歇发酵试验,考查了装液量、pH、接种量、温度,以及氮素和碳素等因素对黏红酵母(Rhodotorula glutinis)增殖与油脂合成的影响。结果表明,在稀释糖蜜COD浓度11100mg/L、初始pH值6.5、30℃和160r/min条件下发酵132h,黏红酵母的总细胞干重和油脂产量分别达到2.42和0.8g/L,去除单位COD的细胞产量和油脂产量分别为0.35和0.12kg/kg;在黏红酵母发酵系统中,氮源的补充对细胞增殖具有显著刺激作用,但对油脂合成与积累无显著影响;在发酵过程中一次性补加碳源葡萄糖10g/L,可使黏红酵母的细胞和油脂产量分别提高到3.74和1.3g/L。
Microbial oil production is a feasible source of raw materials for biodiesel industry. Because of its excellent capability in grease synthesis and accumulation, Rhodotorula glutinis is a good candidate to produce microbial oil by molasses fermentation. The influencing factors, such as culture volume, pH value, inoculum concentration, temperature, nitrogen and carbon nutrition, were investigated by batch cultures. The results indicate that a dry-cell yield of 2.42g/L and a grease yield of 0.8g/L are obtained after fermenting for 132h with an initial COD concentration of 11100mg/L, pH value of 6.5, temperature of 30℃ and swing at 160r/min. The corresponding specific dry-cell and grease yield by COD removal are 0.35 and 0.12kg/kg, respectively. The dry-cell yield and grease yield could be increased to 3.74 and 1.31g/L, respectively, by adding 10g/L glucose instantly at a certain fermentation moment. The addition of nitrogenous nutriments to the fermentation system could promote the multiplication of R. glutinis remarkably, but has no observable influence on the grease yield.
biodiesel
/
microbial oil
/
Rhodotorula glutinis
/
fermentation
李建政;王 茜;班巧英.
Rhodotorula glutinis发酵糖蜜产油脂影响因素研究.
科技导报,
2010
, 28
(20)
: 77
-81
.
.
Influencing Factors in Molass Fermentation by Rhodotorula glutinis for Microbial Oil Production[J].
Science & Technology Review ,
2010
, 28
(20)
: 77
-81
.
2010年第28卷第20期
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接收时间:2010-06-22
首发时间:2010-10-28
出版时间:2010-10-28
收稿日期:2010-06-22
修回日期:2010-09-26
https://castjournals.cast.org.cn/joweb/kjdb/CN/1242120774975295789
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2种不同金属材料的力学参数
科 Family 属数 Number of genus 种数 Number of species 占总种数比例 Percentage of total species (%) 属 Genus 种数 Number of species 占总种数比例 Percentage of total species (%) 鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78 小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39 多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39 红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87 小菇属 Mycena 11 5.26 光柄菇属 Pluteus 5 2.39 红菇属 Russula 17 8.13 栓菌属 Trametes 5 2.39
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