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- Antioxidant activity of Artemisia annua LPublication . Vieira, Rita; Pinho, Cláudia; Oliveira, Ana I.; Oliveira, Rita F.; Cruz, AgostinhoTea infusions of Artemisia annua are known for their prophylactic and therapeutic efficacy against malaria. However, recent studies have revealed that A. annua possess a variety of pharmacological activities such as antibacterial, cytotoxic and antioxidant.
- Physicochemical properties and antioxidant activity of portuguese craft beers and raw materialsPublication . Silva, Sara; Oliveira, Ana Isabel; Cruz, Agostinho; Ferraz Oliveira, Rita; Almeida, Rubim; Pinho, CláudiaThere is an increase in the popularity of craft beer, which is produced by small, independent, and traditional breweries. Since craft beer popularity is rising in Portugal this research focused on assessing physicochemical parameters, total phenolic content (TPC) and the antioxidant capacity of Portuguese craft beers and raw materials used in beer production. In this experimental study, 19 beer samples were analyzed. Parameters such as pH, Total Acidity, Reducing Sugar Content and TPC were evaluated. For the determination of antioxidant activity, DPPH scavenging activity and metal chelating activity (MCA) were analyzed in all samples. Craft beers demonstrated a high phenolic content (ranging from 343.78 mg GAE/L to 2172.49 mg GAE/L), significantly different from industrial beers. Craft beers demonstrated a higher inhibition of DPPH radicals and higher MCA than the raw materials. DPPH inhibition ranged from 36.5% to 96.0% for malt and 64.7% to 79.6% in hops samples. MCA also varied between the different samples, with results of 12.0% to 24.8% in malt samples and 3.8% to 23.5% in hops. Raw materials can potentially influence the antioxidant activity of the resulting beer. Positive correlations between TPC and physicochemical properties can be useful to help consumers choose beers with added value for health.
- Antioxidant and cytotoxic activity of Dandelion (Taraxacum officinale) ethanolic extractPublication . Pinho, Cláudia; Laranjeira, Cátia; Oliveira, Ana Isabel; Oliveira, RitaFerrazDandelion (Taraxacum oficinale) is a plant known for its medicinal properties, such as antioxidant and anticancer activity. Increasing interest and research on medicinal plants have revealed its potential for treating different diseases, including cancer.
- Influence of solvent type, extraction techniques, particle size, extraction times and temperatures on antioxidant activity of T. hispanicumPublication . Laranjeira, Cátia; Oliveira, Ana Isabel; Ferraz Oliveira, Rita; Cruz, Agostinho; Pinho, CláudiaPlants of the genus Taraxacum have been used for years in medicine and food. This genus, with a complex taxonomy, includes some species of difficult distinction, where T. hispanicum is included. The leaves of these plants, known as dandelion, continue to be used as infusions, ethanolic extracts, or as juice. Since the plant represents an important source of pharmacologically active molecules, namely antioxidant activity, it is important to develop extractive procedures to maximize its potential health benefits.
- Comparison of antioxidant activity for Ginkgo biloba L. and Rosmarinus officinalis LPublication . Silva, Diana; França, Ana; Pinho, Cláudia; Oliveira, Ana I.; Oliveira, Rita F.; Cruz, AgostinhoNatural antioxidant products have gained popularity worldwide and are increasingly being used to treat various diseases. Leaves of Rosmarinus officinalis L. and Ginkgo biloba L. possess a variety of bioactivities, including antioxidant.