Simultaneous determination of bromine and chlorine in cow's milk by radioactivation analysis

SummaryA technique for determining the concentration of leucocytes in cow's milk is described which is more rapid and accurate as well as much less tedious than conventional microscope methods. The leucocytes are isolated from the fat globules of comparable size by a novel centrifuging procedure. Sizing of the leucocytes with a Coulter electronic counter shows that their volumes range from about 45 to 1770 µm3but a partially overlapping distribution of other particulate matter prevents the accurate determination of the total number of cells present. The numbers counted in truncated leucocyte distributions, however, correlate linearly with total cell counts determined with an improved microscope method up to 6 × 106cells/ml of milk.

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Determination of trace metals in cow's milk from waste water irrigated areas in Central Mexico by chemical treatment coupled to PIXE

Microchemical Journal ◽

10.1016/j.microc.2008.06.001 ◽

2009 ◽

Vol 91 (1) ◽

pp. 9-12 ◽

Cited By ~ 17

Author(s):

C. Solis ◽

K. Isaac-Olive ◽

A. Mireles ◽

M. Vidal-Hernandez

Keyword(s):

Waste Water ◽

Trace Metals ◽

Chemical Treatment ◽

Cow’S Milk ◽

Central Mexico ◽

Cow's Milk

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Determination of tetracycline antibiotics in cow's milk by liquid chromatography/tandem mass spectrometry

Rapid Communications in Mass Spectrometry ◽

10.1002/rcm.2991 ◽

2007 ◽

Vol 21 (9) ◽

pp. 1511-1520 ◽

Cited By ~ 40

Author(s):

Hendrik De Ruyck ◽

Herman De Ridder

Keyword(s):

Mass Spectrometry ◽

Liquid Chromatography ◽

Tandem Mass Spectrometry ◽

Cow’S Milk ◽

Tandem Mass ◽

Tetracycline Antibiotics ◽

Cow's Milk ◽

Chromatography Tandem Mass Spectrometry ◽

Liquid Chromatography Tandem Mass

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Phosphorus Compounds of Milk. V. The Phosphorus Partition in Milk, with Preliminary Observations on Milk Phosphatase

Journal of Dairy Research ◽

10.1017/s0022029900000923 ◽

1933 ◽

Vol 5 (1) ◽

pp. 54-62 ◽

Cited By ~ 23

Author(s):

W. R. Graham ◽

H. D. Kay

Keyword(s):

Phosphorus Compounds ◽

Appreciable Amount ◽

Cow’S Milk ◽

Inorganic P ◽

Cow's Milk ◽

Holstein Friesian ◽

P Content ◽

Mammalian Tissues ◽

Jersey Cows

1. Using the method described by Sanders for protein and fat precipitation from cow's milk, a fairly satisfactory method of determining the phosphorus partition in cow's milk has been devised.2. It is found that the gravimetric procedure of the American Association of Official Agricultural Chemists ((10), p. 3), which was not, in any case, specifically recommended for the analysis of milk, cannot be applied with safety to the determination of inorganic phosphate in filtrates prepared by Sanders' (1932) method, and that the conclusion that there is no appreciable amount of organically combined phosphorus in these filtrates is therefore invalidated.3. The ester P (organically combined, acid-soluble P) in milk obtained by the usual milking routine varies from 1/7 to 1/4 of the inorganic P of the milk (from 7 to 21 mg. P per 100 c.c. milk).4. An active phosphatase is present in cow's milky, and brings about changes in the ester P content of the milk on standing, possibly within and certainly without the mammary gland. Like phosphatases of all mammalian tissues, its optimum pH is in the neighbourhood of 9·0. In freshly drawn milk it is working, therefore, considerably on the acid side of its optimum.5. The phosphoric ester P of the milk appears to vary with the breed of cow, being low in the miiy of Canadian Holstein-Friesian cows and higher in that of Jersey cows.

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