Excess copper promotes an increase in the concentration of metabolites in Tridax procumbens L.

The study investigated the effects of cultivating Tridax procumbens in hydroponic conditions with different concentrations of copper ions, aiming to understand the physiological changes and the impact on the biosynthesis of secondary metabolites. The treatments consisted of a completely randomized design, with five increasing concentrations of copper (T0 = 0.235, T1 = 12.

Copper exposure leads to changes in chlorophyll content and secondary metabolite profile in leaves.

Cultivation of plants in environments polluted by metals at toxic levels can affect the biosynthesis of secondary metabolites. Here, we analysed the effect caused by excess copper on the concentration of chlorophylls a and b and the profile of secondary metabolites of Lantana fucata leaves. Five copper (Cu) treatments (mg Cukg-1 soil) were tested: T0, 0; T1, 210; T2, 420; T3, 630; and T4, 840.

Performance of polymeric materials for solid phase extraction prior to chromatographic analysis.

Synthetic polymeric materials such as polyethylene and polyurethane (PU) were compared to conventional adsorbents for solid phase extraction for cleaning up biological samples. Efficiency in eliminating proteins and other components usually present in biological samples, such as serum, urine, and tissues extracts, was evaluated. The assays consisted of measuring the remaining protein content in serum and tissue homogenates (liver) and collecting the spectra in the UV region for urine samples.