The binding of rare earth elements with proteins

polysaccharides (PSs)

nucleic acid (DNA) in natural plant Dicranopteris Dichotoma (DD) was studied by molecular activation analysis (MAA). The REE bound proteins (RBP)

polysaccharides (PSs) and DNA (REE-DNA) were obtained using biochemical separation techniques from the leaves of DD. Meanwhile

the contents of eight rare earth elements (La

Ce

Nd

Sm

Eu

Tb

Yb and Lu) were also measured by instrumental neutron activation analysis (INAA). The results showed that the REEs were firmly bound with the proteins

PSs and DNA in the leaves of DD. The molecular weights of RBP-Ⅰ and RBP-Ⅱ were 8.0×10 5u and <12400u

respectively. Most of the PSs bound with REEs were small molecular weight PSs (10000 to 20000u). The molecular weight of REE-DNA band was about 22kb in agarose gel electrophoresis.