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Tribomechanical micronization and activation of whey protein concentdrate and zeolite

Tribomechanics is a part of physics that is concerned with the study of phenomenon that appear during milling under dynamic conditions. Tribomechanical micronization and activation (TMA) of whey protein concentrates (WPC) and zeolites (type clinoptilolite) were carried out. Samples of powdered WPC and zeolite were treated with the laboratory TMA equipment. The treatment was carried out at two various rotor speeds: 16, 000 and 22, 000 r.p.m. at ambient temperature. On the powdered WPC and zeolite, before and after the TMA treatment, the analyses of the particle size and distribution as well as the specific area and scanning electron microscopy were carried out. Suspension of the WPC and zeolite were treated with an ultrasonic, just before determining of a particle size distribution. The frequency of the ultrasound was 50 kHz. The results showed that the tribomechanical treatment causes a significant decrease in particle size, a change in particle size distribution and an increase in specific area of WPC and zeolite. These changes of the treated materials depend on the type of the material, the level of inserting particles, the planned angle of the impact, internal rubbing and the planned number of impacts. The found effects were pronounced more strongly as the rotor speed of TMA equipment was greater (16, 000 to 22, 000 rpm). Ultrasonic treatment of suspension of tribomechanically treated WPC had the result in further destroy of partly damaged protein globulas proved with the statistic analyses. No further changes in their granulometric composition were caused by ultrasonic treatment of suspension of tribomechanically treated zeolite.

tribomechanical micronization; whey protein concentrate; zeolite; ultrasonic treatmen

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