Indirect Micro-Method for Milk Fat Determination

A method for the micro-determination of magnesium.

A Micro Manometric Method for the Determination of Diphosphopyridine Nucleotide

In the course of histochemical studies of the retina, it was desired to determine the diphosphopyridine nucleotide content of single microtome sections of tissue weighing on the order of 10 to 50 y. It was, therefore, necessary to increase the sensitivity of the manometric method for the determination of DPN. To this end, the technique of Linderstrom-Lang (6) with the Cartesian diver was employ...

A Micro Method for the Determination of Potassium as Iodoplatinate *-

The standard and most widely accepted method for the determination of potassium depends upon its precipit,ation as potassium chloroplatinate. The modification called the Lindo-Gladding procedure (1) is official with the Association of Official Agricultural Chemists. Methods based upon the precipitation of potassium as potassium of cobalti-nitrite (2), have been very useful in determination of p...

Micro method for determination of borohydride with NAD+.

A spectrophotometric method for the determination of borohydride is described. It involves the reduction of NAD’ to a number of isomeric forms of NADH by borohydride. In the standard assay procedure herewith presented, there is a direct proportionality between the absorption at 340 nm and the amount of borohydride in solution over the range IO-100 nmoles, with an effective “molar extinction coe...

A Colorimetric Micro-method for the Determination of Glutathione.

1. A rapid colorimetric and apparently specific micromethod for the determination of total glutathione in small amounts of tissue is described. Generally, less than 30mg. of tissue is sufficient and this is homogenized in ice-cold 3% metaphosphoric acid. The product is filtered through sintered glass and neutralized or diluted before being added to a cuvette containing phosphate buffer, pH7.1, ...