Determination of antioxidant activity and anthocyanin content of kombucha teas produced by using cherry laurel (Prunus laurocerasus), black carrot (Daucus carota L. ssp. sativus var. atrorubens Alef.), blackthorn (Prunus spinosa) and raspberry (Rubus idaeus)

Kombucha is a traditional refreshing beverage usually prepared by fermentation of sweetened black or green tea. Besides tea, thyme, mint, sage, cinnamon, lime and other plants such as lemon production is possible. In this study, it was aimed to investigate the effects of different raw materials usage on composition and sensory properties of kombucha beverage. For this aim, cherry laurel, red raspberry, blackthorn fruits and black carrot juice concentrate were added to green tea infusion according to preliminary test results. After 40 hours of fermentation at 28±2°C, beverages were stored at 4o C for 12 days. During fermentation and storage; total acidity, pH, brix, colour, total phenolic matter content, antioxidant capacity and total monomeric anthocyanin content of the samples were analyzed. The results demonstrated that using different raw materials together with green tea for fermentation contributed nutritional value, functional and sensory properties of the kombucha beverage