The influence of acoustic effect of ultrasound on the formation of consumer properties of yogurts

Today fermented milk drinks are associated with “healthy products”, but the majority of fermented milk drinks can’t ensure the declared useful properties. To solve this problem it’s suggested to use the acoustic effect of ultrasound initiated with the help of an UZTA-O.4/22-OM ultrasonic technological apparatus (vibration frequency (22 ± 1.65) kHz). The structure mechanical characteristics and accumulation of a minor biologically active substance, i.e. kefiran are accepted as main factors which specify consumer properties. The ultrasonic effect was applied while preparing milk raw materials in two power modes 190 and 240 W during 3 minutes. In the course of research studies the authors have obtained the results which confirm the use of ultrasonic exposure (UE) when producing yoghurt products as a new approach, which enables one to provide consumers with functional products of high quality. The application of UE during 3 minutes at 180 W reduced the whey separation from a clot by 20 %, which agrees with visual observance. The viscosity in the examined samples of yoghurts varies in the ranges: 13.31…15.02 mPas for samples in case of UE during 3 minutes at 180 W and 4.09…4.79 mPas for the yoghurt samples in case of UE during 3 minutes at 240 W. It’s determined that UE stimulates kefiran accumulation by 5…30 %, and more intensively in case of UE during 3 minutes at 240 W. The data obtained in the course of studies give grounds for the use of UE in the technology of yoghurt products as a new approach, which provides consumers with functional high-quality products.