EFFECT OF VIBRATION FREQUENCY AND EXPOSURE TIME ON THE TECHNOLOGICAL USABILITY OF FRESH MILK

A study was undertaken in order to monitor the effect of vibrations with variable frequency (10-60 Hz) and different times of exposure to vibrations (30 and 120 min) on changes in selected physicochemical properties of milk, especially those determining its technological usability. Vibrations were found to negatively affect the properties of milk significant from the technological point of view, producing a slight increase in its acidity and conductance, a decrease in thermal and ethanolic stability as well as a reduction in the time of rennet coagulation of raw milk, among other effects. The changes of the analysed milk traits as affected by vibrations were observed to depend on the frequency band applied and to intensify with an increasing frequency and elongated time of milk exposure to vibrations, thus exerting a significant, negative impact on its technological usability.

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eISSN:	2083-6007
ISSN:	1230-0322

W latach 2022-2024 kwartalnik naukowy Polish Journal of Food and Nutrition Sciences realizuje projekt nr RCN/SP/0520/2021/1 finansowany ze środków budżetu państwa – Ministerstwo Edukacji i Nauki w ramach programu „Rozwój czasopism naukowych”. Dofinansowanie wynosi 120 000 zł. W ramach projektu podejmowane są działania zmierzające do podniesienia poziomu praktyk wydawniczych i edytorskich, zwiększenia wpływu czasopism na rozwój nauki oraz utrzymania się czasopism w międzynarodowym obiegu naukowym.

In the years 2022-2024, the scientific quarterly Polish Journal of Food and Nutrition Sciences accomplishes a project no. RCN/SP/0520/2021/1 financed from the state budged – Ministry of Education and Science Republic of Poland in the framework of a program “Development of scientific journals”. The financing amounts to 120,000 PLN. The program aims at improving the level of publishing and editing practices, increasing the impact of scientific journals on science development, and extending the international range of scientific journals.