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The prevalence of thyroid dysfunction, including goiter and cancer, is higher in the elderly as compared to the younger population. An excess or deficiency of specific chemical element contents in thyroid parenchyma plays an important role ingoitroand carcinogenesis of this gland. The variation with age of the mass fraction of twenty elements (Al, B, Ba, Br, Ca, Cl, Cu, Fe, I, K, Li, Mg, Mn, Na, P, S, Si, Sr, V, and Zn) in normal thyroids of 33 females (mean age 54.5 years, range 3.5-87) was investigated. Measurements were performed using a combination of non-destructive and destructive methods: instrumental neutron activation analysis and inductively coupled plasma atomic emission spectrometry, respectively. Tissue samples were divided into two portions. One was used for morphological study while the other was intended for chemical element analysis. This work revealed that there is a statistically significant increase in Al, Br, Ca, Cu, Fe, P, S and Zn mass fraction, as well as a decrease in the Cl mass fraction in the normal thyroids of females during a lifespan. Results of the study showed that for elderly females there is a goitrogenic and carcinogenic association with elevated levels of the thyroid parenchymal chemical elements as Al, Br, Ca, Cu, Fe, and Zn, which increase intra-thyroidal oxidative stress.

journal of biochemistry and analytical studies

Variation with Age of Chemical Element Contents in Females’ Thyroids Investigated by Neutron Activation Analysis and Inductively Coupled Plasma Atomic Emission Spectrometry