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极大和钝顶螺旋藻对Se(Ⅳ)的吸收和代谢
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摘要
研究了各种硒胁迫对生长周期不同阶段的极大螺旋藻(S.maxima)和钝顶螺旋藻(S.platensis)的生长、硒生物有机化和代谢的影响:此外,还采用DAN荧光法测定了5种生物样品中的总硒含量。获得了一些有意义的结果:
     1.在S.maxima和S.platensis不同生长阶段进行硒胁迫处理:分别从接种后1(st)d至5(th)d开始添加硒,并不断增加硒浓度,至7(th)d使硒的累计浓度为1000mg·L~(-1),形成5种不同硒胁迫(硒胁迫Ⅰ~Ⅴ)。观察各种硒胁迫对螺旋藻生长及螺旋藻中无机硒的生物有机化的影响。结果表明:硒胁迫Ⅰ~Ⅳ对两种螺旋藻的生长影响不明显,而硒胁迫Ⅴ对螺旋藻生长有明显促进作用;螺旋藻含硒总量及其对无机硒的有机化率按硒胁迫Ⅰ~Ⅴ依次增加。首次提出硒胁迫强度概念,并用此较好地解释了有关实验结果。
     2.在S.maxima、S.platensis接种后5(th)d和6(th)d两天内施加硒胁迫(累计加硒浓度分别为600,800和1000mg/L),获得了有机硒含量分别为580.83、685.94、771.65μg·g~(-1)(DW)的S.maxima和461.91、616.06、1376.20μg·g~(-1)(DW)的S.platensis。分析了螺旋藻藻体及7(th)~10(th)d培养液中的有机硒含量,表明无机Se(Ⅳ)经螺旋藻吸收代谢后的产物分布状况:存在于螺旋藻中的含硒有机分子;由藻细胞代谢产生的水溶性有机硒小分子;由藻细胞代谢产生挥发性气态含硒小分子。
     3.用2,3-二氨基萘(DAN)荧光法测定了螺旋藻、茶叶、枸杞、酵母和灵芝宝5种生物样品中的总Se含量。测量结果为:检出限0.2×10~(-3)μg/mL;线性范围0.2×10~(-3)~1.0μg/mL:回收率94.8~104.2%;相对标准偏差(RSD)平均4.6%;结果满意。
Effect of different Se(IV)-intimidation on the growth of S. maxima and S. platensis at different growth phases, bio-organization and metabolism of Se(IV) were investigated in this study. Total Se content in five biological samples was determined by diaminonaphthalene (DAN) fluorometry. Some interesting results were observed.
    First of all, Se(IV) concentration increased with adding Se(IV) from the 1st day to the 5th day, gradually. The cumulated Se(IV) concentration on the 7th day was 1000mg-L-1(Se(IV)-intimidation I~V). The growth of Spirulina, the absorption and bio-organization of Se were also discussed. The results indicated that Se(IV)-intimidation I~IV showed no significant effect on the growth of Spirulina,while Se(IV)-intimidation V showed obvious promotion. The total Se content and bio-organization ratio of Se increased from I to V. The results were explained by Se(IV)-intimidation intensity at the first time.
    Secondly, Se(IV)-intimidation on 5. maxima and S. platensis on 5th and 6th day was implemented, with cumulated Se(IV) concentration of 600, 800 and 1000mg-L-1. The organic Se content was 580.83 , 685.94, 771.65 g g-1(DW) in S. maxima, while 461.91, 616.06, 1376.20 g-g-1 (DW) in S. platensis. The metabolites of Spirulina under different Se(IV)-intimidation were distributed as follows: Se-containing organic molecules in Spirulina; Se-containing organic molecules in algae culture; Se-containing organic molecules volatiled into the air.
    Thirdly, Se content in five biological samples including Spirulina, tea leaf, medlar, yeast and mythic fungus was determined by diaminonaphthalene (DAN) fluorometry. The detected limitation was 0.223 10-3 g/mL, with liner range of 0.223 10-3~ 1.0 g/mL, recovery ratio of 94.8-104.2%, and average relative standard deviation (RSD) of 4.6%.
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