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Study on the accumulation level of heavy metals was conducted on sediment and fishes from estuaries of Bay of Bengal. Heavy metals were determined by using Inductively Coupled Plasma Optical Emission Spectrometer (ICP-OES) and the results were compared to permissible limits of WHO/USEPA. The accumulation patterns of Fe and Cd were found predominantly in all samples tested when correlated with other metals. It was found that the concentration of metals such as Cd (3.90 ± 0.25 μg/g), Cr (0.44 ± 0.05 μg/g), Ni (0.33 ± 0.01 μg/g), and Mn (1.1 ± 0.11 μg/g) were exceeding the permissible limit, whereas Fe, Co, Pb, and Zn were found within the limit of WHO/USEPA at station 1. In station 2, Cd (16.5 ± 0.4 μg/g), Mn (0.67 ± 0.11 μg/g), and Cr (0.80 ± 0.01 μg/g) were exceeding the permissible limit, whereas Fe, Co, Pb, Ni, and Zn were found within the limit. This study emphasizes that Cd and Mn levels in both stations, are far higher than the acceptable values set by WHO/USEPA and may therefore present human health hazards. It is therefore mandatory to carry out extensive research to evaluate the possible environmental risk factors in the vicinity of both estuaries with respect to heavy metals.

MATERIALS AND METHODS Collection of plant materialThe plants, including flowers of Tanacetum cineriifolium, Tagetes erect were obtained from the areas in and around Coimbatore, Tamil Nadu, India and Lantana camara were ORIGINAL RESEARCH ARTICLE OPEN ACCESSInternational Current Pharmaceutical Journal ABSTRACTThe present study is conducted to find the efficacy of plant extracts to act as mosquito repellents. Initially, the larvicidal activity of the extracts and the toxicity study was conducted. From the results, the extracts with maximum larvicidal activity and the minimum toxicity were used for the further analysis. The least toxicity was observed with the ethanol extracts of Lantana camara, Tagetes erecta and Tanacetum cineriifolium. The Lanatana camara and Tanacetum cineriifolium showed the maximum larvicidal activity. The DNA sugar damage assay is performed and read at 532 nm. The hemolytic activity of the extract is conducted and the results indicate that the extracts showed no hemolytic activity at the concentration of 100 and 200mg/L. Only the flower extracts of Tagaetes erecta, Lantana camara and Tanacetum cineriifolium showed moderate hemolytic activity at 500 and 1000 mg/L. Finally, the HPLC analysis of the extracts showed that the ethanol extracts of Lantana camara and Tanacetum cineriifloium revealed the presence of marker compound. Therefore the ethanol extracts of Lantana camara and Tanacetum cineriifolium were taken up for the membrane stabilization assay. The skin irritation potential of the cream prepared using the ethanol extract of Tanacetum cineriifolium was analysed, the cream showed no irritation.