Quercetin, a bioactive plant flavonoid, is an antioxidant, and as such it exhibits numerous beneficial properties including anti-inflammatory, antiallergic, antibacterial and antiviral activity. It occurs naturally in fruit and vegetables such as apples, blueberries, cranberries, lettuce, and is present in plant waste such as onion peel or grape pomace which constitute good sources of quercetin for technological or pharmaceutical purposes. The presented study focuses on the role of quercetin in prevention and treatment of dermatological diseases analyzing its effect at a molecular level, its signal transduction and metabolism. Presented aspects of quercetin potential for skin treatment include protection against aging and UV radiation, stimulation of wound healing, reduction in melanogenesis, and prevention of skin oxidation. The article discusses quercetin sources (plant waste products included), methods of its medical administration, and perspectives for its further use in dermatology and diet therapy.

Background. Water usage during beer production is one of the highest in the food processing indus try. The dynamically growing microbrewery market requires the implementation of water recycling sys tems. The research investigated and presented the technology for the recovery of rinse water from the brewing industry. A case study examined the usage of water during the brewing and cleaning process in a small brewery. Moreover, an analysis of brewery rinse water before and after purifying was conducted. Results and conclusions. The purified water obtained had high technological values, including lower turbidity, reduced content of nitrates and over two-fold increased content of chlorides and met the re quirements for drinking-grade water. The implementation of the analyzed system may both provide finan cial benefits and ensure compliance with sustainable development trends initiated by the largest breweries. The design and features of the analyzed purifying system make it possible to use it commercially in the microbrewing industry.