海洋卡盾藻日本株过氧化氢产生的影响因素

对海洋卡盾藻日本株(Chattonella marina Japan,CMJP)在不同盐度、营养盐条件及不同生长期的过氧化氢产生特点进行了研究.结果表明:H2O2浓度峰值出现在CMJP对数生长期(4~8d),以第6d达到最大,为0.97×10-4nmol/cell.在N:P为8:1和16:1的情况下,CMJP生长较快,藻细胞在对数生长末期之前一直保持较高密度.CMJP产生的H2O2量与藻类生长呈现出一定的相反趋势,在藻细胞适宜生长的N:P下,产生的H2O2浓度较小.在N:P为16:1时单个藻细胞的H2O2量最低(0.40×10-4nmol/cell),仅是N:P为32:1时(1.17 ×10-4nmol/cell)的1/3,N:P为8:1时,单个藻细胞的H2O2浓度为0.63 ×10-4nmol/cell. CMJP在盐度为20,25psu时生长较好且藻细胞达到较高密度,在盐度为10,15,30psu时藻密度较低,表明低盐和高盐条件均不利于CMJP的生长.盐度对CMJP过氧化氢的产量有一定的影响,在高盐度下单个藻细胞的H2O2产量增加,盐度为30psu时,H202浓度最高(1.1×10-4nmol/cell).

Study on production of peroxide hydrogen by Chattonella marina Japan strain

The induced peroxide hydrogen (H2O2) under different stages of C. marina which was treated at different salinity and nutrient conditions was studied. The results showed that high concentration of H2O2 was observed during the logarithmic phase from 4 to 8 d, with the maximum value of 0.97×10-4nmol/cell on the 6th day. Under the N:P ratio of 8:1 and 16:1, CMJP possessed the relative higher growth rate and cell concentration. However, H2O2 concentration was relatively low at those optimal N:P ratios, indicating the production of H2O2 is negative to the growth of C. marina. The lowest concentration of peroxide hydrogen of CMHK was 0.40×10-4nmol/cell with the N:P ratio of 16:1, which was only one third of that with the N:P ratio of 32:1 (1.17 ×10-4). The concentration of peroxide hydrogen per cell was 0.63 ×10-4nmol/cell when N:P ratio was 8:1. The optimal salinities for the growth of CMJP were 20 and 25psu, where cell concentrations were relatively higher. However, cell concentrations were lower at the salinity of 10, 15 and 30psu, showing the growth of CMJP was depressed at relatively low and high salinity. Salinity also influenced the production of peroxide hydrogen. The concentration of peroxide hydrogen per cell was 1.1 ×10-4nmol/cell, the highest value among the experiments, at the salinity of 30 psu.