RT - Journal Article T1 - Assessment of Metallothionein as a Biomarker of Heavy Metal (Hg, Cd, Pb and Cu) in Oyster Crassostrea gigas in Imam Khomeini Port JF - JOC YR - 2012 JO - JOC VO - 3 IS - 9 UR - http://joc.inio.ac.ir/article-1-106-en.html SP - 27 EP - 39 K1 - Metallothionein K1 - Biomarker K1 - Heavy metals K1 - Oyster Crassostrea gigas K1 - Imam Khomeini port K1 - Persian Gulf. AB - The present study aimed to validate the potential use of MTs as a biomarker of Hg, Cd, Pb and Cu exposure in soft tissue of oysters Crassostrea gigas in Imam Khomeini port. For this purpose, oysters from the same size were sampled on March 2010 from 5 different locations including harbors of Petroshimi, Doc Sorsoreh, 15, 28 and 33 in the Imam Khomeini port. The samples were freeze dried and acid digested in order to determine their heavy metal content. MT contents of oysters were extracted first and then after precipitation by ethanol/chloroform, they were measured by spectrophotometry method. Results indicated that the content of Hg, Cd, Pb and Cu in the oysters’ soft tissue were 3.12±2.77, 10.34±3.98, 7.1±3.30 and 440.57±66.17 µg/g of dry weight respectively. MT concentrations in the oysters of different stations ranged from 96.5±5.53 to 185.75±7.34 µg/g of wet weight. the Highest level of Hg, Pb and Cu were measured in harbor of Petroshimi while the highest level of Cd was measured in harbor no 15. The oysters from harbor no 28 contained the lowest level of all measured metals. Also the lowest amount of MT synthesis observed in the oysters from harbor no 28. The highest level of MT was measured in oysters from harbor no 15. Among the studied metals, Cd showed a strong and direct correlation with MT level in the oysters (P0/05). It is concluded that MT is an appropriate biomarker for Cd contamination in oysters from Imam Khomeini port. LA eng UL http://joc.inio.ac.ir/article-1-106-en.html M3 ER -