Issue 20, 2018

Tea quality testing using 6B pencil lead as an electrochemical sensor

Abstract

Isomers of dihydroxy benzene (DHB) such as 1,2-DHB, 1,3-DHB and 1,2,3-trihydroxy benzene (1,2,3-THB) are the functional constituents of tea polyphenols. Herein, we report an elegant 6B pencil lead for real-time tea quality assessment via a simple and quick procedure to electrochemically detect polyphenols in a mixture without any adsorption complication. A pre-anodised 6B-PGE, denoted as 6B-PGE* has showed well-defined anodic signals without any separation technique for the dihydroxy (DHB) and trihydroxy benzene derivatives present in tea polyphenols at distinct potentials. Differential pulse voltammetry was adopted for the quantification procedure. The constructed calibration plots were linear in the windows, 10–100 μM, 50–350 μM and 10–70 μM for 1,2-, 1,3- and 1,4-DHB isomeric derivatives, respectively. The calculated sensitivity and detection limit (signal-to-noise ratio = 3) values were 0.2234, 0.0725 and 0.0627 μA μM−1 and 0.719, 2.469 and 5.072 μM, respectively. Quantification of the polyphenolic content in two different tea dust samples was demonstrated as representative examples.

Graphical abstract: Tea quality testing using 6B pencil lead as an electrochemical sensor

Article information

Article type
Paper
Submitted
15 Mar 2018
Accepted
07 Apr 2018
First published
09 Apr 2018

Anal. Methods, 2018,10, 2327-2336

Tea quality testing using 6B pencil lead as an electrochemical sensor

N. Vishnu, M. Gandhi, S. Badhulika and A. S. Kumar, Anal. Methods, 2018, 10, 2327 DOI: 10.1039/C8AY00557E

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements