Joint International Research Laboratory of Agriculture & Agri-Product Safety, Yangzhou University, Yangzhou 225009, PR China.
Joint International Research Laboratory of Agriculture & Agri-Product Safety, Yangzhou University, Yangzhou 225009, PR China.
Sci Total Environ. 2020 Mar 25;710:136448. doi: 10.1016/j.scitotenv.2019.136448. Epub 2020 Jan 3.
Docosahexaenoic acid plays a vital role in human health as it is essential for the proper function of the nervous system and for visual functions. To decrease the cost of docosahexaenoic acid production by Schizochytrium, the cost of the medium should be further decreased. In this study, the use of tofu whey wastewater to culture Schizochytrium sp. for docosahexaenoic acid production was tested, with the goal of reducing the medium cost. The results indicated that tofu whey wastewater presented a better culture performance with respect to biomass, lipid, and docosahexaenoic acid production compared with three traditional media. Through simple pH adjustment, the biomass and docosahexaenoic acid productivity reached 1.89 and 0.24 g/L/day, respectively, which were much higher than those obtained using traditional medium. The removal efficiency of chemical oxygen demand, total nitrogen, and total phosphorus reached 64.7, 66.0, and 59.3%, respectively. Due to the rich nutrients in tofu whey wastewater, the use of extra nitrogen source was avoided and the total medium cost for docosahexaenoic acid production in cultures using tofu whey wastewater was <1/3 of that of traditional media. This result indicated that tofu whey wastewater is an effective and economic basal medium for docosahexaenoic acid production by Schizochytrium sp.
二十二碳六烯酸在人类健康中起着至关重要的作用，因为它对神经系统和视觉功能的正常运作至关重要。为了降低裂殖壶菌二十二碳六烯酸生产的成本，应该进一步降低培养基的成本。在这项研究中，测试了使用豆腐乳清废水来培养裂殖壶菌以生产二十二碳六烯酸，目的是降低培养基的成本。结果表明，与三种传统培养基相比，豆腐乳清废水在生物量、脂质和二十二碳六烯酸生产方面表现出更好的培养性能。通过简单的 pH 调整，生物量和二十二碳六烯酸的生产力分别达到 1.89 和 0.24 g/L/天，远高于使用传统培养基获得的产量。化学需氧量、总氮和总磷的去除效率分别达到 64.7%、66.0%和 59.3%。由于豆腐乳清废水中含有丰富的营养物质，因此避免了额外添加氮源，并且使用豆腐乳清废水培养生产二十二碳六烯酸的总培养基成本不到传统培养基的 1/3。这一结果表明，豆腐乳清废水是裂殖壶菌生产二十二碳六烯酸的有效且经济的基础培养基。
