Wechselstromuntersuchung an Rohmilch mit dem Ziel der Zellzahlbestimmung

Udder illnesses can have an essential influence on quantity and quality of the milk. A diagnosis is possible with the help of the deviation of milk contents, especially over the change of the somatic cells. The cell count consequently makes an important health and quality criterion of the milk. In order to determine the cell count and other contents directly after the vormilk, the relation between the count of the milk cells and the impedimetric quanities of the milk was examined systematically in a new measure cell with alternating current. The measurements were executed isotherm with different temperatures over a wide frequency area (10 Hz -13 MHz) and the results were compared with the cell counts obtained with standard procedures (Fossomatic). Relations between the measured complex electric quantities and the content of the milk like lactose and cell count were produced with help of statistical methods. No direct relation is found between the impedimetric qualities (complex condauctance, conductance or capacity) of milk and the number of cells found in it. Cause of that is the inhomogeneity of the cells, that varies considerably regarding their size and mass. The lactose concentration correlates good with impedimetric quantities (amplitude, phase shift, capacity and conductance) of milk. Particularly with the condactance of the milk a statistically secured relation is found over the entire frequency area (10 Hz - 13 MHz). The lactose concentration correlates on the other hand well with the cell count and makes a statistically secured prognosis of this quantity with high precision possible. Future it is possible to determine the cell count with the help of the complex conductivity, for what simple conductivity measuring instruments are suitable.

Level thesis:degree_level

thesis.doctoral

Grantor dc:publisher

Technische Universität Dresden

Year

2004

Author dc:creator

• Hassan, Anwar

Contributors dc:contributor

• Bernhardt, G.
• Rohm, H.
• Guth, U.

• Einfluss von Zellzahl
• Milchinhaltstoffe und Temperatur auf die impedimetrischen Eigenschaften der Rohmilch
• Zellzahl
• impedimetrische Messverfahren
• cell count
• impedimetric measure procedures
• influence of cell count
• milk contents and temperature at the impedimetric properties of raw milk