| 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. 1160-1190 (1/cm), of the single carbon-oxygen bonds of the ester groups of the fat molecules is used in the determination. When the determinations are carried out on milk or on a milk product, the effect of lactose can, when so desired, be taken into account by measuring the characteristic absorption peak of lactose and by carrying out, on the basis of it, a correction in the fat concentration value yielded by the C-O absorption peak. Since scatter does not affect the absorption peak of the C-O bond, the determinations according to the invention can be carried out directly from full milk, without a preceding homogenization treatment. |
