The contents of chromium in the DNA

RNA and protein fractions separated from chromium-rich and normal brewer’s yeast were determined with the neutron activation analysis in order to study the combination of Cr with DNA

RNA and protein in chromium-rich brewer’s yeast. Our results showed that the extracting rats and concentrations of DNA

RNA and protein had no significant difference in two types of yeast

but the chromium contents of DNA

RNA and protein in the chromium-rich yeast were significantly higher than those in the normal. In addition

the content of chromium in DNA was much higher than that in RNA and protein

which indicated that the inorganic chromium compounds entered into the yeast cell

during the yeast cultivation in the culture medium containing chromium were converted into organic chromium compounds combined with DNA

RNA and protein.