食品科学 ›› 2017, Vol. 38 ›› Issue (14): 64-70.doi: 10.7506/spkx1002-6630-201714010

• 生物工程 • 上一篇    下一篇

脉冲式添加氮源对耐温微藻Desmodesmus sp.F51细胞生长和细胞组成的影响

谢友坪,赵旭蕊,阳需求,卢英华,郑向南,陈剑锋   

  1. (1.福州大学生物科学与工程学院,福建?福州 350108;2.厦门大学化学化工学院,福建?厦门 361005)
  • 出版日期:2017-07-25 发布日期:2017-09-06
  • 基金资助:
    国家自然科学基金应急管理项目(41641050);福建省青年科技人才创新基金资助项目(2016J05077); 福建省海洋高新产业发展专项(闽海洋高新[2016]15号);福州市市校(院所)科技合作项目(2015-G-69)

Effect of Nitrate Pulse-Feeding Cultivation on Cell Growth and Cell Composition of Thermo-Tolerant Desmodesmus sp. F51

XIE Youping, ZHAO Xurui, YANG Xuqiu, LU Yinghua, ZHENG Xiangnan, CHEN Jianfeng   

  1. (1. College of Biological Science and Engineering, Fuzhou University, Fuzhou 350108, China; 2. College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China)
  • Online:2017-07-25 Published:2017-09-06

摘要: 考察脉冲式添加氮源培养对耐温微藻Desmodesmus sp. F51细胞生长和细胞组成的影响。结果表明,在脉冲式添加氮源培养过程中,藻株F51的蛋白质含量由(560±16)mg/g降低至(456±17)mg/g,而碳水化合物和油脂含量则分别由(209±13)mg/g和(98±3)?mg/g提高至(310±12)mg/g和(120±4)mg/g。另外,对色素和油脂的具体组成变化进行分析,发现脉冲式添加氮源培养可增强β-胡萝卜素的生物合成,以及促进α-胡萝卜素生物转化为叶黄素,同时还可发现叶黄素积累与多不饱和脂肪酸含量变化呈正相关性。而在碳水化合物的具体组成分析中,发现碳水化合物为藻株F51主要的储能物质,当脉冲式添加氮源培养时间为3?d时,其葡萄糖占总碳水化合物的质量分数可明显提高至(75.7±1.4)%。采用脉冲式添加氮源培养策略可明显同时促进藻株F51叶黄素和碳水化合物的生产。

关键词: 微藻, 流加培养, 细胞组成, 叶黄素, 碳水化合物

Abstract: The aim of the present study was to investigate the effect of nitrate pulse feeding on the cell growth and cell composition of Desmodesmus sp. F51. Under nitrate pulse-feeding cultivation, the protein content of cells of Desmodesmus sp. F51 decreased from (560 ± 16) mg/g to (456 ± 17) mg/g, while the contents of carbohydrate and lipid increased from (209 ± 13) mg/g to (310 ± 12) mg/g and (98 ± 3) mg/g to (120 ± 4) mg/g, respectively. By investigating the changes in carotenoid, lipid and carbohydrate compositions, it appeared that nitrate pulse feeding could promote β-carotene biosynthesis and enhance the bioconversion of α-carotene to lutein. Lutein accumulation was positively associated with polyunsaturated fatty acid formation. Desmodesmus sp. F51 tended to accumulate carbohydrate as an energy storage product after 3 days of cultivation under nitrate pulse-feeding conditions, and the major accumulated monosaccharide was glucose (75.7 ± 1.4)%. Therefore, the nitrate-pulse feeding strategy is a highly promising approach to simultaneously produce lutein and carbohydrate in Desmodesmus sp. F51.

Key words: microalgae, fed-batch culture, cell composition, lutein, carbohydrate

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