A stable sensor for the determination of gallic acid (GA) or caffeic acid (CA) was fabricated by electrodeposition of Zn-Al-NO3 layered double hydroxide film on a glassy carbon electrode (LDHf/GCE). A sensitive electrochemical method for the determination of GA and CA in phosphate buffer solution (pH 3) has been achieved. The differential pulse voltammetry response of the LDHf/GCE to GA has a linear concentration range of 4 �M to 600 �M with a correlation coefficient of 0.9985 and the calculated detection limit is 1.6 �M at a signal-to-noise ratio of 3. The differential pulse voltammetry response of the LDHf/GCE to CA has a linear concentration range of 7 �M to 180 �M with a correlation coefficient of 0.9969 and the calculated detection limit is 2.6 �M at a signal-to-noise ratio of 3. The proposed method was applied to the determination of GA in commercial green tea samples.

Electrochemical determination of phenolic acids at a Zn/Al layered double hydroxide film modified glassy carbon electrode

247th National Meeting (2014)

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