邹宁 蔡雯雯 孙东红等
摘要 研究了0.15、0.30、0.75、1.50 g/L 4种不同硝酸钠营养浓度条件对雨生红球藻生长状况的影响,同时探究了该试验条件对雨生红球藻中虾青素起始积累期和后期积累量的影响,以寻找既能使雨生红球藻在氮源用尽后细胞密度达到或接近最大,同时又能最快直接进入虾青素积累阶段的硝酸钠营养添加浓度。试验结果表明,硝酸钠浓度为0.15 g/L时雨生红球藻细胞生长状况最好,细胞浓度最高可以达到5.19×105个/ml。此条件下细胞尚未停止生长即已有细胞开始积累虾青素,变红(培养的第23天)。使用有机溶剂萃取法以丙酮提取虾青素,硝酸钠浓度为0.15 g/L时,最终虾青素浓度达到19.136 mg/L,是其他硝酸钠浓度下的虾青素含量最大值。
关键词 雨生红球藻;硝酸钠浓度;虾青素;丙酮
中图分类号 S968.41+9 文献标识码 A 文章编号 0517-6611(2015)15-232-03
Effect of NaNO3 Concentrations on Growth of Haematococcus pluvialis and Astaxanthin Accumulation
ZOU Ning, CAI Wenwen, SUN Donghong et al
(College of Life Science, Ludong University, Yantai, Shandong 264025)
Abstract Effects of four different NaNO3 concentrations, 0.15, 0.30, 0.75, and 1.50 g/L, on growth of Haematococcus pluvialis and accumulation of astaxanthin were studied. The optimal NaNO3 concentration for growth of H. pluvialis and accumulation of astaxanthin, early as well as high content was determined when nitrogen is depleted. The extracting agent of astaxanthin is acetone in the process. The results showed that the optimal NaNO3 concentration was 0.15 g/L with 5.19×105 cells/ml the maximal cell density and 19.136 mg/L the maximal astaxanthin content, while the astaxanthin accumulation started at 23th day from the culture.
Key words Haematococcus pluvialis; Sodium nitrate content; Astaxanthin; Acetone
近年来,国内外对抗氧化产品的需求量在不断增加,天然虾青素作为目前已知的最强的抗氧化剂在抗癌、增强免疫力[1-3]等医药保健和绿色食品添加剂、化妆美容等相关行业的需求量不断攀升,国内外研究人员致力于天然虾青素产品研制,但虾青素的纯度和产量远不能满足市场需求。探究天然虾青素的高效生产、提取纯化工艺是亟待解决的问题。
天然虾青素的来源主要是细菌、原生动物、真菌、微藻和甲壳类动物,其中以利用真菌和藻类及甲壳类动物提取天然虾青素为主。目前,天然虾青素的主要分离纯化方法有:酶解法[4]、有机溶剂萃取法、层析法、高效液相色谱法等[5-7],其中以有机溶剂萃取法的工业化应用最为广泛,后两者由于成本较高等诸多原因多应用于产品研发阶段。……