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Volume 4 Toxicology: Open Access
ISSN: 2476-2067 Toxicology Congress 2018
March 12-14, 2018
March 12-14, 2018 Singapore
14th World Congress on
Toxicology and Pharmacology
Circulation of zinc and cadmium in the sea and land environment of west Japan
Yumiko Nitta
Hiroshima Shudo University, Japan
The Hiroshima-Oyster has bearded the Setouchi
local cuisine culture. Its commercial share
expanded to all over Japanafter the great earthquake
of eastern Japan in 2011. In order to evaluate the
sanitary environment around Hiroshima Bay
area, we collected wild oysters (Crassostrea gigas)
and mud from gulf of Hiroshima, Kurashiki and
Kagoshima, and measured their zinc (Zn) and
cadmium (Cd) in their meat, shell and the mud.
The mud at the gulf of Hiroshima contained Zn
and Cd with amounts of 188.0 and 0.53 mg/kg mg/
kg, respectively. Concentration ratios of Zn in the
oysters were higher as the concentrations of it in
mud were lower. The concentration ratio of Zn in
the shell/whole oyster (meat plus shell) was constant among the three groups with the value of 0.019. This finding made us
available to estimate the Zn concentration ratio of the meat from that of the shell. The formula is b=c•a, where b is concentration
ratio in meat, c is constant (46.4) and a concentration ratio in shell. Concentration of Cd in the shell/whole oyster was constant
among the three groups (0.26~0.42). For the monitoring of the cultivation environment of Hiroshima Bay area, the seawater
temperature, salinity concentration and plankton amount were recorded weekly, while the content of moisture, protein, total
lipid, minerals, Zn was measured monthly for mature and immature oysters. Measuring the concentration of Cd in shells and
mud is very informative to estimate the amounts of metals we consume through seafood, vegetables and poultry, as the shell
has been recycled for fertilizer of vegetables or food of poultry in Japan.
Recent Publications
1. Harada T, Nitta Y, et al. (2017) Epidemiological Study of Eating Habit of Middle-Aged and Elderly Women: Mihara and
Hiroshima Questionnaire Study. International Medical Journal; 24: 214 -218.
2. Nitta Y, et al. (2007) Intestinal tumorigenicity of mice carrying hemizygous Pax6, Pax6(Sey-4H). Exp. Anim.; 56: 289-294.
References
1. Aoi S, et al. (2016) Association of Changes in Neck Circumference with Cardiometabolic Risk in Postmenopausal Healthy
Women. J. Atheroscler Thromb.; 23: 728-36.
2. Aoi S, et al. (2014) Neck circumference has possibility as a predictor for metabolic syndrome in postmenopausal women.
Hiroshima J. Med. Sci.; 63: 27-32.
Biography
Yumiko Nitta has completed her PhD from Hiroshima University. She started her occupation as the Research Assistance at Research Institute of Radiation Biology
and Medicine in Hiroshima University, where she examined effects of radiations on mammalian genome. Then, she obtained the position of Associate Professor at
Suzugamine Women’s College, where she analyzed data of human health monitoring. Presently she is a Professor at the Department of Nutrition, Faculty of Health
Science of Hiroshima Shudo University, where she concerns about nutrition epidemiology.
Yumiko Nitta, Toxicol Open Access 2018, Volume 4
DOI: 10.4172/2476-2067-C1-006
Figure-1: Concentration of zinc (Zn) and cadmium (Cd); concentration ratio of zinc (Zn)
and cadmium (Cd)