1. bookVolume 5 (2012): Issue 1 (April 2012)
Journal Details
License
Format
Journal
eISSN
1339-3065
ISSN
1337-978X
First Published
10 Dec 2012
Publication timeframe
2 times per year
Languages
English
access type Open Access

Utilization of electrochemical methods in determination of trace elements in beverages

Published Online: 14 May 2012
Volume & Issue: Volume 5 (2012) - Issue 1 (April 2012)
Page range: 42 - 46
Journal Details
License
Format
Journal
eISSN
1339-3065
ISSN
1337-978X
First Published
10 Dec 2012
Publication timeframe
2 times per year
Languages
English
Utilization of electrochemical methods in determination of trace elements in beverages

Electrochemical methods have many inherent advantages such as simplicity, low cost and amenability to miniaturization. A new, sensitive and selective electrochemical method for the caffeine determination using boron doped diamond electrode was developed. It was found by cyclic voltammetry that caffeine provided highly reproducible and well-defined irreversible oxidation peak, at very positive potential of +1.55 V vs. Ag/AgCl electrode. The effect of pH and scan rate on the voltammetric response of caffeine oxidation were studied to select the optimum experimental conditions. Linear response of peak current on the concentration in the range from 4 × 10-7 to 2.5 × 10-5 mol L-1, good repeatability (RSD of 2.1 %) and the detection limit of 1.5 × 10-7 mol L-1 without any chemical modifications and electrochemical surface pretreatment were observed by differential pulse voltammetry in 0.4 mol L-1 perchloric acid. The effect of possible interfering compounds appeared to be negligible which evidently proved very good selectivity. The proposed method was successfully applied for the caffeine determination in commercially available beverage samples, with results in a close statistical agreement to these declared by manufacturer.

Keywords

Armenta S, Garrigues S, Guardia M (2005) Anal. Chim. Acta 547: 197-203.Search in Google Scholar

Chen Q, Guo Z, Zhao J (2008) J. Pharm. Biomed. Anal. 48: 1321-1325.Search in Google Scholar

Fernandez-Maestre R, Hill HH (2009) Int. J. Ion Mobil. Spec. 12: 91-102.Search in Google Scholar

Goyal RN, Bishnoi S, Agrawal B (2011) J. Electroanal. Chem. 655: 97-102.Search in Google Scholar

Ito M, Suzuki T, Yada S, Kusai A, Nakagami H, Yonemochi E, Terada K (2008) J. Pharm. Biomed. Anal. 47: 819-827.Search in Google Scholar

Jafari MT, Rezaei B, Javaheri M (2011) Food Chem. 126: 1964-1970.Search in Google Scholar

Koleva BB, Kolev TM, Tsalev DL, Spiteller M (2008) J. Pharm. Biomed. Anal. 46: 267-273.Search in Google Scholar

Lawrence NS, Pagels M, Meredith A, Jones TGJ, Hall CE, Pickles CSJ, Godfried HP, Banks CE, Compton RG, Jiang L (2006) Talanta 69: 829-834.10.1016/j.talanta.2005.11.02018970644Search in Google Scholar

Pecková K, Musilová J, Barek J (2009) Crit. Rev. Anal. Chem. 39: 148-172.Search in Google Scholar

Pleskov YV (2002) Russ. J. Electrochem. 38: 1275-1291.Search in Google Scholar

Rostagno MA, Manchón N, D'Arrigo M, Guillamón E, Villares A, García-Lafuente A, Ramos A, Martínez JA (2011) Anal. Chim. Acta 685: 204-211.Search in Google Scholar

Schrenk MJ, Villigram RE, Torrence NJ, Brancato SJ, Minteer SD (2002) J. Membr. Sci. 205: 3-10.Search in Google Scholar

Sullivan C, Sherma J (2005) J. AOAC Int. 88: 1537-1543.10.1093/jaoac/88.5.1537Search in Google Scholar

Tzanavaras PD, Themelis DG (2007) Anal. Chim. Acta 581: 89-94.Search in Google Scholar

Zhao Y, Lunte CE (1997) J. Chromatogr. B 688: 265-274.Search in Google Scholar

Zhao F, Wang F, Zhao W, Zhou J, Liu Y, Zou L, Ye B (2011) Microchim. Acta 174: 383-390.Search in Google Scholar

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