Microwave dielectric spectroscopy study of water dynamics in normal and contaminated raw bovine milk
| Autor: | Yuri Feldman, Paul Ben Ishai, Dror Bezman, Gil Katz, Daniel Agranovich |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Enthalpy
Analytical chemistry Food Contamination 02 engineering and technology Dielectric Activation energy Mastitis Conductivity 010402 general chemistry 01 natural sciences symbols.namesake Colloid and Surface Chemistry Escherichia coli Animals Physical and Theoretical Chemistry Microwaves Arrhenius equation Chemistry Temperature food and beverages Streptococcus Water Surfaces and Interfaces General Medicine 021001 nanoscience & nanotechnology 0104 chemical sciences Dielectric spectroscopy Solvent Milk Dielectric Spectroscopy symbols Thermodynamics Cattle Female 0210 nano-technology Somatic cell count Biotechnology |
| Zdroj: | Colloids and surfaces. B, Biointerfaces. 154 |
| ISSN: | 1873-4367 |
| Popis: | The role of water in bovine milk is more complicated than that of a background solvent. To understand the interaction between water and the constituents of milk, an extensive dielectric study of the γ-dispersion of raw bovine milk was carried out over the frequency range 0.1–50 GHz and the interval of temperatures (10 °C–42 °C). Samples were provided by utilizing an extended donor pool. The results reveal that the temperature dependence of the characteristic relaxation times is described by the Arrhenius law. Furthermore, it conforms to a Meyer-Neldel compensation, whereby the pre-factor of the relaxation times is dependent on the activation energy. This entropy/enthalpy compensation is traced to the interaction between bulk water dynamic clusters and other milk constituents. A statistical correlation between the Somatic Cell Count, a traditional measure of milk quality, and the relaxation times is provided as well, opening new vistas for the industrial classification of milk. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect