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Simultaneous Detection of Protocatechuic Acid, Chlorogenic Acid and Caffeic Acid in Honey by HPLC with Ultraviolet and Electrochemical Detectors

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Figure

Figure 1. The molecular structures of PA, CLA and CAA, and the redox reaction mechanism of PA, CLA and CAA using HPLC (UV-ECD)
Figure 2.  Cyclic voltammetry of the bare GCE in 1 g L-1 PA, CLA and CAA solution after being immersed in borax buffer solution (pH 9.18)
Figure 3.  Effects of different mobile phase compositions on the current of the HPLC (UV-ECD) method for the three organic acids (the mobile phase compositions of 4% acetic acid and methanol were 75:25; 80:20; 85:15; 90:10; 95:5; 1
Figure 5.  Effect of voltage on the current of the HPLC (UV-ECD) method for the three organic acids
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