Solochrome Cyanine Research Articles

The determination of fluorine or phosphorus in organic compounds by a micro-titrimetric method

A method is described for determining fluorine or phosphorus in organic compounds synthesised for medical research. After combustion of the compound in an oxygen flask and absorption of the decomposition products in water, the contents are diluted with isopropanol, and titrated with thorium nitrate solution with a Solochrome cyanine R screened indicator. The addition of buffers is unnecessary. The removal of elements that interfere in the titration of fluorine is also described.

The argyrophilic fibres of human gingival connective tissue

Cold microtome and paraffin sections of chronically inflamed human gingival tissue were impregnated with silver, or stained with Masson's trichrome, van Gieson's picro-fuchsin, alcian blue, acid solochrome cyanine R, the periodic acid-Schiff reaction, haematoxylin and eosin or for sulphation-induced metachromasia. Some cold microtome sections were subjected to extraction with distilled water, salts or buffers. Two distinct types of argyrophilic fibres were present in areas where collagen had been destroyed. Wavy, unbranched, young collagen fibres were apparently laid down as a healing response. Young collagen may be deposited directly on preexisting collagen. Fine branched reticulin fibres, forming part of a network which ramifies throughout the gingival connective tissue and which includes the subepithelial reticulin, were also present. The two groups of fibres were identified by their morphology and by the extraction experiments. It is concluded that in chronic gingivitis the collagen breaks up into fine fibrils and disintegrates into debris, losing its affinity for stains with which it normally reacts. The young collagen is thought to be broken down into scattered argyrophilic granules, and the reticulin to lose material from its surface so that the fibres become very thin, and often appear interrupted. Collagen and young developing collagen appear to be more susceptible to destructive processes in chronic gingivitis than is reticulin.

Colorimetric determination of trace amounts of aluminium in steel

The method for the determination of aluminium in steel consists of a preliminary separation of iron, together with nickel, chromium, copper and molybdenum, by mercury cathode electrolysis. The electrolysed solution is made up to a known volume, and from an aliquot, the residual iron, together with any titanium and vanadium, is removed by extraction of the cupferrate with chloroform. After destruction of the excess cupferron, the solution is neutralised, a messured excess of acid is added, and the aluminium-nitrated solochrome cyanine R complex is formed under optimum conditions.

Studies in qualitative inorganic analysis. IX

The use of Solochrome Cyanine to test for aluminium ion in the iron group separation is recommended and is preferred to the use of Aluminon.

The colorimetric determination of aluminium in steel with Solochrome cyanine R

The first page of this article is displayed as the abstract.