Diatom Research Laboratory, Amity Institute of Biotechnology, Amity University, Noida, India.
Amity School of Earth & Environment Science, Amity University, Haryana, India.
Environ Monit Assess. 2023 Jun 8;195(7):820. doi: 10.1007/s10661-023-11336-0.
With increasing anthropic activities, a myriad of typical contaminants from industries, hospitals, and municipal discharges have been found which fail to be categorized under regulatory standards and are hence considered contaminants of "emerging concern". Since these pollutants are not removed effectively even by the conventional treatment systems, they tend to inflict potential threats to both human and aquatic life. However, microalgae-mediated remediation strategies have recently gained worldwide importance owing to their role in carbon fixation, low operational cost, and production of high-value products. In this study, centric diatom Chaetoceros neogracilis was exposed to different concentrations of estradiol (E2)-induced synthetic media ranging from 0 to 2 mg L, and its impact on the antioxidative system of algae was investigated. The results demonstrate that the nutrient stress caused a strong oxidative response elevating the superoxide dismutase (SOD) activity and malondialdehyde (MDA) content in the 2 mg L E2-treated diatom cultures. However, the specific activity of the HO radical scavenging enzymes like catalase (CAT) was inhibited by the E2 treatment, while that of ascorbate peroxidase (APX) remained comparable to the control (0 mg L of E2). Thus, the study reveals the scope of diatoms as potential indicators of environmental stress even under the varying concentration of a single contaminant (E2).
随着人类活动的增加，工业、医院和城市排放的大量典型污染物被发现，这些污染物无法被监管标准所归类，因此被认为是“新兴关注”的污染物。由于即使是传统的处理系统也不能有效地去除这些污染物，它们往往会对人类和水生生物造成潜在威胁。然而，由于微藻在固碳、低运营成本和生产高价值产品方面的作用，微藻介导的修复策略最近在全球范围内受到重视。在这项研究中，中心硅藻 Chaetoceros neogracilis 暴露于不同浓度的雌二醇（E2）诱导的合成培养基中，浓度范围从 0 到 2 mg/L，并研究了其对藻类抗氧化系统的影响。结果表明，营养胁迫引起强烈的氧化反应，提高了超氧化物歧化酶（SOD）的活性和丙二醛（MDA）的含量在 2 mg/L 的 E2 处理的硅藻培养物中。然而，E2 处理抑制了 HO 自由基清除酶如过氧化氢酶（CAT）的比活性，而抗坏血酸过氧化物酶（APX）的比活性与对照（0 mg/L 的 E2）相当。因此，该研究揭示了硅藻作为环境应激潜在指标的范围，即使在单一污染物（E2）浓度变化的情况下也是如此。
