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Absorption spectra of baicalein in the presence of (a) Cu2+, (b) Mg2+ and (c) Al3+. Cbaicalein = 2.66 × 10−5 mol L−1; [Cu2+] = 0.00, 1.00, 2.00, 3.00, 4.00, 5.00, 6.00 and 7.00 × 10−5 mol L−1; [Mg2+] = 0.00, 0.25, 0.50, 0.75, 1.00, 1.25, 1.50 and 1.75 × 10−2 mol L−1; [Al3+] = 0.00, 0.40, 0.80, 1.20, 1.60, 2.00, 2.40 and 2.80 × 10−4 mol L−1.
