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Advisor(s)
Abstract(s)
Nowadays, new emerging products claiming antioxidant properties are becoming more frequent.
However, information about this topic in their labels is usually scarce. In this paper, we analyzed total
phenolics, total flavonoids and ascorbic acid contents, as well as DPPH scavenging activity of several
commercial samples, namely green tea and other herbal infusions, dietary supplements, and fruit juices,
available in the Portuguese market. In general, beverages containing green tea and hibiscus showed higher
phenolics contents (including flavonoids) and antioxidant activity than those without these ingredients.
A borututu infusion presented the lowest concentrations of bioactive compounds and scavenging activity,
due to the low recommended amount of plant to prepare the beverage. Some juices without antioxidant
claims in the label presented similar values to those with it.
Description
Keywords
Antioxidant activity Ascorbic acid Phenolic compounds Tea Dietary supplements Juices