Chemical and physical analysis of milk, condensed milk, and infants' milk-foods, with special regard to hygene and sanitary milk inspection

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1882 Excerpt: ...a drop of oil, which will not affect the sugar crystals and salts. Cane sugar appears in large monoclinic prisms; milk sugar in four-sided tri-metric prisms; calcium lactate forms tufts of fine needles. The specific gravity is determined in a flask of known weight and contents, in the manner described above. Chemical Examination. For the determination of the solids and ash, two to three grms. of condensed milk are accurately weighed in a covered platinum crucible, coagulated by means of absolute alcohol, and treated as described on page 22. Care must be taken that the sample is perfectly free from solder. Its presence would not only produce inaccurate results, but would destroy the platinum crucible when the solids are incinerated. The albuminates and the fat are determined in two to three grms. accurately weighed in a covered beaker; 100 to 150 grms. of water are then added, the whole mixed thoroughly and precipitated with copper solution, as usual. From 1.5 to 2 c.c. of copper solution, and 0.75 to 1 c.c. alkali solution are required. The remaining part of the process of manipulation is the same as previously described (see page 24). The determination of the cane sugar and milk sugar is made in such a manner that the latter is directly determined by means of Fehling's solution, while the former is calculated. This method of determination by difference may well be accepted, considering the fact, that the rest of the constituents is determined by very accurate methods. Well-preserved condensed milk of commerce varies in its composition according to the degree of concentration, the addition of cane sugar, and the season in which it has been manufactured. The composition of condensed milk from different establishments varies as follows: Water and volatile sub...