碳酸氢钠、氯化钠和pH对菱形藻EPA累积的影响  

Effects of NaHCO_3,NaCl and pH on the EPA accumulation of Nitzschia sp.

作　　者：吴华莲[1] 苏娇娇[1,2] 向文洲[1] 刘纪化[1] 李涛[1] 何慧[1] 

机构地区：[1]中国科学院南海海洋研究所,中国科学院热带海洋生物资源与生态重点实验室,广东广州510301 [2]润科生物工程(福建)有限公司北京生物科技研发中心,北京101312

出　　处：《渔业现代化》2014年第3期5-10,共6页Fishery Modernization

基　　金：中国科学院知识创新工程青年人才领域前沿项目(SQ201213);广东省中国科学院全面战略合作项目(2012B091100268);海洋经济创新发展区域示范专项(SZHY2012-B01-003)

摘　　要：菱形藻(Nitzschia sp.)MD1藻株是一株具有嗜碱特性,富含二十碳五烯酸(EPA)的硅藻。本研究探讨了培养基中碳酸氢钠(NaHCO_3)、氯化钠(NaCl)浓度和pH对菱形藻MD1 EPA累积的影响。结果显示,NaHCO_3浓度和pH对菱形藻MD1总脂肪酸和EPA含量有明显的影响。在试验范围内,NaHCO_3、NaCl浓度和pH对EPA产量的影响呈现先增加后降低的趋势。NaHCO_3、NaCl浓度和pH这3个因素中,最有利于EPA累积的条件和EPA产量分别为:NaHCO_3浓度16.8g/L,EPA产量8.16 mg/L;pH 9.5,EPA产量12.72mg/L;NaCl浓度10g/L,EPA产量13.24 mg/L。研究表明,菱形藻MD1具有较强的高碱及高盐耐受性,而且在高碱及高盐培养条件下具有较高的EPA含量和产量,是一株具有生产EPA潜力的微藻。Nitzschia sp. MD1, a diatom characterized by alkaliphilicity, is rich in EPA which belongs to omega-3 polyunsaturated fatty acids. In this study we investigated the effects of NaHCO3 , NaCl and initial pH of medium on the EPA accumulation of Nitzschia sp.. The results showed that NaHCO3 concentration and pH value of the medium has obvious effects on the content of total fatty acids and EPA. Effect trend of NaHCO3, NaCl and pH on EPA accumulation firstly increases and then decreases in the scope of the tests. Among these 3 factors, the optimum condition for EPA accumulation and respective yields are： when the NaHCO3 concentration was at 16.8 g/L, the EPA yield was 8.16 mg/L, and the EPA yield was 12.72 mg/L at a pH of 9.5, 13.24 mg/L at a concentration of 10 g/L NaCl. The results indicated that MD1 showed strong tolerance to high alkaline and salt;and there were high EPA contents and EPA yields under cultural condition with high alkaline and salt, so it may be a candidate for EPA production.

关 键 词：菱形藻MD1 碳酸氢钠 氯化钠 PH 脂肪酸 EPA 

分 类 号：Q949.2[生物学—植物学]