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original articleIssue 16 (3) 2017 pp. 269-282

Urszula Szymanowska, Barbara Baraniak, Urszula Gawlik-Dziki

Department of Biochemistry and Food Chemistry, University of Life Sciences in Lublin, Poland

Changes in the level and antioxidant activity of polyphenols during storage of enzymatically treated raspberry juices and syrups

Abstract

Background. Berry juices are a rich source of phenolic compounds exhibiting antioxidant activity. Unfortu- nately, polyphenols and especially anthocyanins are degraded during storage.

Materials and methods. The levels of total phenolic compounds, phenolic acids, flavonoids, and antho- cyanins as well as antioxidant activity (radical scavenging ability against DPPH and ABTS+• and chelating power Fe2+) were determined in raspberry juices (obtained after enzymatic treatment with three commercial pectinolytic enzyme preparations) and syrups (obtained by the addition of sucrose at concentrations of 30% and 70%) during storage.

Results. During the five-month storage of juices and syrups at room temperature, there was significant re- duction in the level of phenolic compounds, in particular anthocyanins (up to 95% in relation to the initial content). Storage of raspberry juices and syrups also resulted in a reduction in antioxidant activity.

Conclusions. The enzymatic treatment of the raspberry mash generally increased the losses of anthocyanins. The addition of sugar to fruit juices only slightly reduced these losses.

Keywords: raspberry juice, phenolic compounds, antioxidant activity, pectinolytic enzymes, sucrose addition
pub/.pdf Full text available in english in Adobe Acrobat format:
http://www.food.actapol.net/issue3/volume/3_3_2017.pdf

http://dx.doi.org/10.17306/J.AFS.0491

For citation:

MLA Szymanowska, Urszula, et al. "Changes in the level and antioxidant activity of polyphenols during storage of enzymatically treated raspberry juices and syrups." Acta Sci.Pol. Technol. Aliment. 16.3 (2017): 269-282. http://dx.doi.org/10.17306/J.AFS.0491
APA Szymanowska U., Baraniak B., Gawlik-Dziki U. (2017). Changes in the level and antioxidant activity of polyphenols during storage of enzymatically treated raspberry juices and syrups. Acta Sci.Pol. Technol. Aliment. 16 (3), 269-282 http://dx.doi.org/10.17306/J.AFS.0491
ISO 690 SZYMANOWSKA, Urszula, BARANIAK, Barbara, GAWLIK-DZIKI, Urszula. Changes in the level and antioxidant activity of polyphenols during storage of enzymatically treated raspberry juices and syrups. Acta Sci.Pol. Technol. Aliment., 2017, 16.3: 269-282. http://dx.doi.org/10.17306/J.AFS.0491