The Examination of Milk for Public Health Purposes
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of cream add an equal bulk of mercuric nitrate solution and about 20 c.cms. of cold water. Shake vigourously and filter after stand- ing for a few minutes. Inability to obtain a clear filtrate indi- cates the presence of gelatine and this may be confirmed by adding an equal volume of a saturated solution of picric acid.
A yellow precipitate is produced by gelatine in a cold solution.
Starch is detected by the formation of a blue colouration on addition of a solution of iodine in potassium iodid...e.
Saccharate of lime may be detected by the estimation of either the lime in the ash or by the lactose determination. The lime in normal samples averages about 22.4 per cent of the ash and any perceptible increase over this amount is suspicious.
Similarly an abnormally high polarimeter reading, equivalent, when calculated as lactose, to more than 52.5 per cent of the sohds not fat, should also be regarded with suspicion.
88 CHEMICAL EXAMINATION Skim Milk. The usual methods of milk analysis may be applied.
What to read after The Examination of Milk for Public Health Purposes?
You can find similar books in the "Read Also" column, or choose other free books by Joseph Race to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
of cream add an equal bulk of mercuric nitrate solution and about 20 c.cms. of cold water. Shake vigourously and filter after stand- ing for a few minutes. Inability to obtain a clear filtrate indi- cates the presence of gelatine and this may be confirmed by adding an equal volume of a saturated solution of picric acid.
A yellow precipitate is produced by gelatine in a cold solution.
Starch is detected by the formation of a blue colouration on addition of a solution of iodine in potassium iodid...e.
Saccharate of lime may be detected by the estimation of either the lime in the ash or by the lactose determination. The lime in normal samples averages about 22.4 per cent of the ash and any perceptible increase over this amount is suspicious.
Similarly an abnormally high polarimeter reading, equivalent, when calculated as lactose, to more than 52.5 per cent of the sohds not fat, should also be regarded with suspicion.
88 CHEMICAL EXAMINATION Skim Milk. The usual methods of milk analysis may be applied.
What to read after The Examination of Milk for Public Health Purposes?
You can find similar books in the "Read Also" column, or choose other free books by Joseph Race to read onlineMoreLess
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