. Analysis of milk and milk products. Milk. MILK AND MILK PRODUCTS 23 cm. long. The connection of this with the receiving flask is made by means of a bulb tube to allow for occasional drawing- back of the Hquid. The cork through which this tube passes into the flask must not fit closely, as opportunity must be given for expansion of the air. The safety tube connecting the distilhng flask with the condenser should terminate a little below the water level in the tank. The apparatus should be heated by the low temperature burner or flat evaporating burner. To avoid spurting of the boiling liquid,
. Analysis of milk and milk products. Milk. MILK AND MILK PRODUCTS 23 cm. long. The connection of this with the receiving flask is made by means of a bulb tube to allow for occasional drawing- back of the Hquid. The cork through which this tube passes into the flask must not fit closely, as opportunity must be given for expansion of the air. The safety tube connecting the distilhng flask with the condenser should terminate a little below the water level in the tank. The apparatus should be heated by the low temperature burner or flat evaporating burner. To avoid spurting of the boiling liquid, it is usual to interpose a safety-tube between the distilling flask and the con- denser. Many forms have been suggested and are figured in the catalogs of dealers in chemical apparatus. The form shown in figure 5 is somewhat compK- cated but is satisfactory. The distillation will be hastened if this tube be covered with non- conducting material. Ritthausen Method.—This method depends on precipitation by copper sulfate and sodium hydroxid. It is apphcable only to fully developed milks; the proteids of colostrum and whey are only partially precipitated. The reagents are given on page 27. 10 grams of milk are placed in a beaker, diluted with 100 of distiUed water, 5 of copper sulfate solution added, and thoroughly mixed. The sodium hydroxid solution is then added drop by drop, with constant stirring, until the precipitate settles quickly and the Hquid is neutral, or at most very feebly acid. An excess of alkali will prevent the precipitation of some of the Fig. S-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Leffmann, Henry, 1847-1930. Philadelphia, P. Blakiston's Son & Co.
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