Changes in Provisional Methods for the Analysis of Foods And Additions Thereto
Changes in Provisional Methods for the Analysis of Foods And Additions Thereto
United States Bureau of Chemistry
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Carefully ignite the residue from the total solids, cool, and weigh. Fat. Measure 15 cc of the above 40 per cent solution, corresponding to 6 grams of the condensed milk, into a Babcock test bottle. Fill nearly to the neck with water and add 4 cc of Fehling's copper solution, shake thoroughly and rapidly, sep- arating the precipitated proteids and fat by means of a centrifuge, & or the precipitate may be allowed to settle of itself, which it does more quickly in the cold. Withdraw the supernata...nt sugar-containing liquid by means of a small stemmed pipette with a wisp of wet absorbent cotton twisted over the bottom to serve as a filter. Wipe off the cotton into the bottle on withdrawing the pipette. Give the precipitated proteids and fat two additional washings as above by shaking with water, separating the pre- cipitate, and removing the washings with the pipette. If the precipitate is caked hard after centrifuging, use a stiff platinum wire as a stirrer. Finally add water to an approximate volume of 17.
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