LABEC M-MIA-A - Manual (Page 63)

Ultrasonic milk analyser
Table II
Calculation of casein content in the sheep milk on the base of used cubic
centimeters 0,1 N soda caustic:
0,1 n NaOH cm 3 Casein% 0,1 n NaOH cm 3 Casein % 0,1 n NaOH cm 3 Casein %
5,40 3,96 6,10 4,47 6,80 4,99
5,45 4,00 6,15 4,51 6,85 5,02
5,50 4,03 6,20 4,55 6,90 5,06
5,55 4,07 6,25 4,58 6,96 5,10
5,60 4,10 6,30 4,62 7,00 5,13
5,65 4,14 6,35 4,66 7,05 5,17
5,70 4,18 6,40 4,69 7,10 5,21
5,75 4,22 6,45 4,73 7,15 5,24
5,80 4,25 6,50 4,77 7,20 5,28
5,85 4,29 6,55 4,80 7,25 5,32
5,90 4,33 6,60 4,84 7,30 5,35
5,95 4,36 6,65 4,88 7,35 5,39
6,00 4,40 6,70 4,91 7,40 5,43
6,05 4,44 6,75 4,95 7,45 5,46
4.8. Measurement accuracy.
Two parallel samples are measured and the difference between them could
not exceed 0,1 %.
The accuracy of the method require the work to be done at place with good
natural illumination, titration to be done evenly, without interruptions, colorless
formalin to be used, preliminarily neutralized with soda caustic and
phenolphthalein indicator.
Formalin titration is easy method, but it is not enough precise. More accurate
results for casein content are obtained using Kjeldhal's method, but it requires
special appliances.
5. Determination of salts in the milk
5.1. General
For the mineral substances in the milk conclusions can me made on the
ashes content.
5.2. Sampling
According Appendices Milk sampling and preparation of samples for analyses
ad Sampling and preparation of samples for verification the accuracy of the
milk analyser, making corrections and recalibration.
Operation manual MRC.VER.01-02.10