Browsing by Author "Silva, Sara"
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- 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.
- Potential biological activities of Craft Beer: A reviewPublication . Silva, Sara; Cruz, Agostinho; Oliveira, Rita Ferraz; Oliveira, Ana Isabel; Pinho, CláudiaBeer production and consumption have increased, stimulated by the popularity of craft beer. The presence of bioactive compounds in beer is described in the literature, including antioxidants related to benefits to human health. This review discusses, in particular, the potential biological activities of craft beer. Results showed that craft beer could potentially have a beneficial effect on cardiovascular disease, diabetes, cancer, neurological disorders, menopause, osteoporosis and oxidative stress. Also, the addition of new ingredients and production techniques can lead to a beverage with potential health value-added. However, further investigation on the health potential of craft beer is needed.