Quantitative measurement of fat, protein and lactose in dairy pr

Details Quantitative measurement of fat, protein and lactose in dairy pr Quantitative measurement of fat, protein and lactose in dairy pr

1981-06-15

1984-05-08

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250340, 250343, G01J 100

Patent

active

044477252

ABSTRACT:
Electro-optical apparatus for measurement of fat, protein, lactose and solids in milk wherein a milk sample in a test cell is irradiated with reference and measurement beams at differing wavelengths for fat, protein and lactose, and signals are stored indicative of uncorrected concentrations. A scaling and correction circuit includes cross-correction circuitry for compensating the effects on each reading caused by the other constituents. The signals so corrected are then provided in percentage by weight or weight over volume on suitable digital displays. For enhanced accuracy of fat concentration, infrared absorption is measured at both the carbon-hydrogen stretching wavelength (3.48 microns) and the wavelength of absorption at the ester linkages (5.72 microns), and the resulting readings are combined in a predetermined function for obtaining a reading of fat concentration.

REFERENCES:
patent: 3161768 (1964-12-01), Goulden
patent: 3803384 (1974-04-01), Braunlich
patent: 4076983 (1978-02-01), Hopkins et al.
patent: 4247773 (1981-01-01), Nexo et al.
patent: 4310763 (1982-01-01), Shields
Keeney, Estimating the Average Carbon Chain Length of Saturated Fatty Acid Esters by Infrared Spectroscopy, J. Amer. Oil Chem. Soc., 39, 304-305 (1962).
Smith, Fatty Acid Composition of the Phospholipids and Other Lipids in Milk, J. Dairy Sci., 45, 581-588 (1962).
Shields, The Analysis of Milk by Infrared Absorption (1975).

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