Addition Of Sodium Nitrite Research Articles

Reaction of Rauwolfia Alkaloids, Indoles, and Related Compounds to Nitrite

The greenish-yellow color complex resulting from the addition of sodium nitrite to an alcoholic solution of reserpine in the presence of dilute sulfuric acid has been re-examined to determine the selectivity of the reaction and the chromophore groups fundamentally responsible for the color. Its application to other rauwolfia alkaloids, indoles, and related compounds was investigated. A new indican reaction is reported for simpler indoles.

FACTORS INFLUENCING DRY-BEADING DEFECTS*

The effect of milling and of application variables on the dry-beading defects of two types of kitchenware enamels was determined. The tearing adjacent to the bead was influenced by the same factors that govern the usual tearing encountered in all enamels. The extent of blistering was controlled by the quantity and nature of the soluble salts deposited in the water line. Potassium carbonate was a primary cause of blistering. Under certain conditions, however, the addition of sodium nitrite or sodium thiosulfate either to the cover enamel or to the beading enamel eliminated blistering.