| 摘要 |
The invention relates to a method for quantitative determination of fat from an emulsion, such as milk or a milk product, containing fat particles. The method uses an IR absorption technique in which the determination is based on a specific absorption peak in the absorption spectrum of the emulsion sample, and the essential idea of the invention is that the absorption peak, at a wave number of approx. 1440 (1/cm), of the carbon-carbon bonds of the fat molecules is used in the determinations. When the determinations are carried out on milk or on a milk product, the effect, on the said peak, of the proteins and lactose present in the milk is taken into account by measuring the characteristic absorption peaks of the said substances and by carrying out, on the basis of the measurements, compensation in the value of the fat concentration yielded by the absorption peak of the carbon-carbon bond. The basis of the determination can in this case be a continuous IR absorption spectrum measured within a wave number range of approx. 1050-1550. |
