硒化锌协同真养产碱杆菌的杂化光合系统研究

ZnSe with R.eutropha bio-hybrid photosynthetic system enhances PHB production

通过传统的生物发酵方式获得PHB(聚-β-羟基丁酸酯)的研究已经趋于成熟,各项生产条件均有学者进行了优化,但是通过传统生物发酵的方式获得的PHB在成本上仍无法和化学合成的PHB或其他石油化工所得到的高分子材料竞争.该研究提出利用水热法合成闪锌矿结构的ZnSe半导体光催化材料与真养产碱杆菌(Ralstonia eutropha)H16构建杂化光合系统,测试系统中PHB含量变化,结合材料的光催化产氢性能来探究光催化材料在生物杂化光合系统中的作用.结果表明,在单纯材料光催化产氢时,材料在短时间虽有不错的产氢性能表现,但是在长时间循环中表现不佳.在结合细菌后,该生物杂化光合系统有着优秀的表现,相较对照组最高可将PHB产量提升至1.87倍,并且在长时间连续工作的条件下系统保持稳定.材料在高浓度下依然对该系统起到正面的作用.并且通过测定底物消耗和计算效率的方式探讨了光催化材料影响该生物光合杂化系统的具体方式.证明了这种方式合成的ZnSe与Ralstonia eutropha H16相结合在光照下能够有效提升PHB的产量.

The research of producing poly-β-hydroxybutyrate by traditional fermentation has become mature, conditions of the fermentation operation have been reported by researchers. Unfortunately, the cost of obtained PHB by fermentation still higher than PHB from chemical synthesis or others polymer produced by petrochemical industry. Here, a sphalerite ZnSe semiconductor photocatalyst was synthesized by hydrothermal method. This material was combined with Ralstonia eutropha H16 which produces PHB. The function of ZnSe in the biological hybrid photosynthetic system was explored by testing the performance of photocatalytic water decomposition and hydrogen production of individual materials and the change of PHB content of the system after the biological hybrid photosynthetic system was constructed with bacteria. The results show that the material has good hydrogen production performance in a short time, but poor performance in a long cycle. Compared with the control group, the highest PHB yield of the hybrid system was 1.87 times, and the system remained stable under the condition of long-term continuous work. The material still had a positive performance in the system at high concentration. By measuring the substrate consumption and calculating the efficiency, the specific way of the photocatalytic materials affecting the biological photosynthetic hybrid system was discussed. The combination of ZnSe synthesized in this way with Ralstonia europha H16 was able to effectively increase the yield of PHB under light.