Voltammetric method using a lead film electrode for the determination of caffeic acid in a plant material

Antioxidant Capacity Determination in Plants and Plant‐Derived Products: A Review

“…In the second and third steps, a mixture of hexane, diisopropyl ether, dichloromethane, formic acid 90%, and propan-2-ol (6.0 : 4.0 : 2.0 : 1.0 : 0.1) v/v was employed. The application of this HPTLC technique with area measurements at 320 nm led to a caffeic acid amount equal to 99.3  μ g/g of dried plant, with RSD of 3.19% [93]. …”

“…By operating in the square wave voltammetric mode, this technique proved viable in the determination of caffeic acid in the herbs of Plantago lanceolata . The caffeic acid amount obtained by the developed voltammetric method was 107.4  µ g/g of dried plant with RSD of 2.95% [93]. …”

“…In differential pulse voltammetric polyphenol assessment, the results exhibited a tight correlation with the antioxidant activities furnished by photocolorimetry [154]. Excellent sensitivity is obtained at caffeic acid stripping voltammetric assessment operating in square wave mode: a detection limit of 4 × 10 −9  mol/L in acetate buffer, pH = 4.0 [93]. Amperometric biosensors have the advantage of enzyme specificity, accuracy, and fastness imparted by electrochemical detection.…”

Application of an in situ plated lead film electrode to the determination of organic compounds in alkaline media

“…The previous articles about the application of lead film electrode to voltammetric measurements show that acetate buffer solutions (pH 4-6) can be used to in situ plating the substrate surface with the lead film and the determination of inorganic ions (U, Mo) and organic compounds [9,[12][13][14][15][16]. Others works show that neutral and mild alkaline media containing lead ions can also serve as plating solutions for in situ lead film formation and Co and Ni determination [5,10,11].…”

“…However, the lead film electrode shows limitations in the anodic potential range due to the oxidation of lead in the potentials more positive than À0.6 V (vs. Ag/AgCl) [9]. The good electroanalytical characteristic of PbFE have encouraged Korolczuk's team to apply it to determine different species including metal ions such as Ni(II), Co(II), U(VI), Mo(VI) [5,[10][11][12][13] as well as organic compounds such as testosterone [14], sildenafil citrate [15], caffeic acid [16] and others [9].…”