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Metal chelating activity analysis. Measure of chelation activity retained in plasma for the phenylethanoid glycosides, (a) compound 1, (b) compound 2 and (c) compound 3 in the presence of copper (Cu), calcium (Ca), magnesium (Mg), zinc (Zn), iron (Fe), or rat serum by UPLC analysis. The data represented mean ± S.D., n = 3. *** p < 0.001 compared with compound alone.
