Global Centre for Environmental Remediation (GCER), Faculty of Science, ATC Building, University of Newcastle, Callaghan, NSW 2308, Australia.
Global Centre for Environmental Remediation (GCER), Faculty of Science, ATC Building, University of Newcastle, Callaghan, NSW 2308, Australia; Cooperative Research Centre for Contamination Assessment and Remediation of Environment (CRC CARE), University of Newcastle, ATC Building, Callaghan, NSW 2308 Australia.
Bioresour Technol. 2019 Jun;281:469-473. doi: 10.1016/j.biortech.2019.03.001. Epub 2019 Mar 1.
Two acid-tolerant microalgae, Desmodesmus sp. MAS1 and Heterochlorella sp. MAS3, originally isolated from non-acidophilic environment, were tested for their ability to withstand higher concentrations of an invasive heavy metal, cadmium (Cd), at an acidic pH of 3.5 and produce biomass rich in biodiesel. The growth analysis, in terms of chlorophyll, revealed that strain MAS1 was tolerant even to 20 mg L of Cd while strain MAS3 could withstand only up to 5 mg L. When grown in the presence of 2 mg L, a concentration which is 400-fold higher than that usually occurs in the environment, the microalgal strains accumulated >58% of Cd from culture medium at pH 3.5. FTIR analysis of Cd-laden biomass indicated production of significant amounts of biodiesel rich in fatty acid esters. This is the first study that demonstrates the capability of acid-tolerant microalgae to grow well and remove Cd at acidic pH.
两种耐酸微藻，Desmodesmus sp. MAS1 和 Heterochlorella sp. MAS3，最初从非嗜酸环境中分离出来，被测试其在酸性 pH 值为 3.5 时耐受更高浓度的入侵重金属镉 (Cd) 的能力，并生产富含生物柴油的生物质。叶绿素生长分析表明，菌株 MAS1 甚至耐受 20mg/L 的 Cd，而菌株 MAS3 只能耐受高达 5mg/L 的 Cd。当在 2mg/L 存在下生长时，这是环境中通常存在浓度的 400 倍，微藻菌株在 pH 3.5 时从培养基中积累了超过 58%的 Cd。对含 Cd 生物质的 FTIR 分析表明，产生了大量富含脂肪酸酯的生物柴油。这是首次证明耐酸微藻能够在酸性 pH 值下良好生长并去除 Cd 的研究。
