Biological Oceanography Division, CSIR-National Institute of Oceanography, Dona Paula, Goa, 403 004, India.
CSIR-National Institute of Oceanography-Regional Centre, Mumbai, 400 053, India.
Environ Sci Pollut Res Int. 2019 Apr;26(11):11342-11354. doi: 10.1007/s11356-019-04564-w. Epub 2019 Feb 23.
Accumulation of toxic metals and indigenous bacteria in oyster, (Saccostrea cucullata) and their impact on antioxidant enzyme activities in the biological system was studied and used to provide snapshot of environmental condition in different tropical estuarine systems. The sedimentary Cd, Pb, and Hg concentration varied from 0.1 to 1.8, 22.0 to 98.0, and 0.03 to 0.11 mg kg (dry wt.) respectively. The bioaccumulated Cd, Pb, and Hg concentration in the oysters ranged from 3.6 to 9.0, 0.03 to 8.0, and 0.06 to 0.1 mg kg (dry wt.) respectively. In the oyster, the Cd concentration was well above the safe limit whereas the Pb and Hg concentrations were below the safe limit recommended by the European Commission (EC No. 1881/2006) for human consumption. The MPN value in the raw oyster for fecal coliforms (33-110 × 10/100 g) exceeded the United States Food and Drug Administration (USFDA) approved limits. Increase in antioxidant enzymes (catalase, superoxide dismutase, glutathione-s-transferase, and metallothionein) activities with increasing pollutants loading was observed. The activities of antioxidant enzymes in the oyster were found to be very useful tool for evaluating environmental condition in any tropical estuarine systems.
研究了牡蛎（Saccostrea cucullata）中有毒金属和土著细菌的积累及其对生物系统抗氧化酶活性的影响，旨在为不同热带河口系统的环境状况提供快照。沉积物中 Cd、Pb 和 Hg 的浓度分别为 0.1 至 1.8、22.0 至 98.0 和 0.03 至 0.11 mg kg（干重）。牡蛎中生物累积的 Cd、Pb 和 Hg 浓度分别为 3.6 至 9.0、0.03 至 8.0 和 0.06 至 0.1 mg kg（干重）。在牡蛎中，Cd 浓度远高于安全限量，而 Pb 和 Hg 浓度低于欧洲委员会（EC No. 1881/2006）推荐的人类食用安全限量。原始牡蛎中粪大肠菌群的 MPN 值（33-110×10/100 g）超过了美国食品和药物管理局（USFDA）批准的限量。随着污染物负荷的增加，抗氧化酶（过氧化氢酶、超氧化物歧化酶、谷胱甘肽转移酶和金属硫蛋白）的活性增加。研究发现，牡蛎中的抗氧化酶活性是评估任何热带河口系统环境状况的非常有用的工具。
