Determination of flavonoids and total polyphenol contents in commercial apple juices

Leposava Pavun, Snežana Uskoković-Marković, Milena Jelikić-Stankov, Daniela Đikanović and Predrag Đurđević
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Leposava Pavun: Faculty of Pharmacy and
Snežana Uskoković-Marković: Faculty of Pharmacy and
Milena Jelikić-Stankov: Faculty of Pharmacy and
Daniela Đikanović: Institute for Multidisciplinary Researches, University of Belgrade, Belgrade, Serbia
Predrag Đurđević: Faculty of Science, University of Kragujevac, Kragujevac, Serbia$2

Czech Journal of Food Sciences, 2018, vol. 36, issue 3, 233-238

Abstract: We propose a sensitive and selective spectrofluorimetric method for the determination of flavonoids as expressed in 'quercetin equivalent' in apple juices. The method is based on the strong emission of the aluminium(III)-quercetin complex at 480 nm with excitation at 420 nm, and it is successfully applied for the determination of flavonoids in commercial apple juices and compared with results obtained in reference spectrophotometric determination. The flavonoid content in commercial apple juices was found to range from 5.53 to 15.55 mg/l quercetin equivalent. The very good agreement between the two methods indicates the suitability of the proposed spectrofluorimetric method for the precise and accurate determination of flavonoids. In addition, the total polyphenol content was determined spectrophotometrically using the Folin-Ciocalteu (FC) method and the antioxidative activity of the tested juices was tested in a DPPH assay and these values were correlated with each other. The obtained profiles of compounds with antioxidative ability lead us to conclude that fruit juice labels based only on fruit % might sometimes misinform consumers.

Keywords: aluminium; antioxidant activity; quercetin; spectrofluorimetry; spectrophotometry (search for similar items in EconPapers)
Date: 2018
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlcjf:v:36:y:2018:i:3:id:211-2017-cjfs

DOI: 10.17221/211/2017-CJFS

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