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YERBA MATE, BLACK AND GREEN TEA INFUSIONS. COMPARISON OF THEIR ALKALOID CONTENT AND ANTIOXIDANT ACTIVITY

DOI: 10.19202/j.cs.2016.01.11


Keywords:

yerba mate, tea, alkaloids, polyphenols, antioxi-dant activity.

Summary
The objective of the present study was to determine alkaloids and total polyphenol contents as well as the antioxidant activity of yerba mate infusions in comparison to green and black tea infusions. Under investigation were: 4 brands of yerba mate and 9 brands of green and black teas commonly sold on the Polish market.
The result obtained showed significant differences among antioxidant activities of yerba mate and green or black teas. The TEAC values for teas ranged from 2.11 (black tea) to 5.72 mmol/g d.w. of extract (green tea). For yerba mate, the antioxidant activities were determined for three following infusions of the same leaves. It was found that the TEAC antioxidant activity and alkaloid content generally are the same in each infusion. It confirms the claim that yerba mate may be infused several times without substantial lost of the active compounds.
Total polyphenol and alkaloid contents were generally higher in green and black teas than in yerba mate infusions. The following infusions of yerba mate leaves contributed to the increase of total polyphenol content from 20% to 40% depending on brands of yerba. The relationship between polyphenol content and the TEAC values was obtained for green and black teas as well as yerba mate infusions. The significant correlations for teas (R = 0.992) and yerba mate (R=0.812) indicate that their antioxidant activity significantly depends on their polyphenols content.

dr Katarzyna PAWLAK-LEMAŃSKA
mgr inż. Olga ZARZYKA dr hab. inż. Anna GLISZCZYŃSKA-ŚWIGŁO, prof. nadzw. UEP
prof. dr hab. Bożena TYRAKOWSKA
Poznań University of Economics and Business,
Faculty of Commodity Science,
Department of Technology and Instrumental Analysis,
al. Niepodległości 10, 61-875 Poznań, Poland
e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

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