SOME COMMENTS ON THE NINHYDRIN-SCHIFF REACTION

The ninhydrin reaction and its analytical applications.

Feuge, R. O., Cousins, E. R., Fore, S. P., Dupre, E. F. & O'Connor, R. T. (1953). J. Amer. Oil Chem. Soc. 30, 454. Feuge, R. O., Pepper, M. B. jun., O'Connor, R. T. & Field, E. T. (1951). J. Amer. Oil Chem. Soc. 28, 420. Garton, G. A. (1954). J. Sci. Fd Agric. 5, 251. Grass Driers' Association (1941). Analyst, 66, 334. Hartman, L., Shorland, F. B. & McDonald, I. R. C. (1954). Nature, Lond., 174...

The Ninhydrin Reaction with Amines and Amides

1 Harding, V. J., and Warneford, F. H. S., J. Biol. Chem., 1916, xxv, 319. 2 Dakin, H. D., and Dudley, H. W., J. Biol. Chem., 1913, xv, 127. 3 Neuberg, C., Biochem. Z., 1913, lvi, 500. 4 Ruhemann, S., J. Chem. Sot. 1910, xcvii, 2026. 5 In this and the preceding paper triketohydrindene hydrate has sometimes been written as the triketone for the sake of simplicity in explaining the decompositions...

Some comments on the cuff.

This issue of RESPIRATORY CARE includes a detailed study of a novel device to maintain a stable pressure within the cuff of an endotracheal tube (ETT).1 Why all the bother? Why do ETTs need cuffs anyway? These seem like silly questions on the surface. A certain level of occlusion between the tracheal wall and the ETT is necessary for positive-pressure ventilation. But what level of occlusion is...

Cyanide reaction with ninhydrin: elucidation of reaction and interference mechanisms.

A new sensitive spectrophotometric method has recently been developed for the trace determination of cyanide with ninhydrin. Cyanide ion was supposed to act as a specific base catalyst. Nevertheless, this paper demonstrates that the reported assay is based on a novel reaction of cyanide with 2,2-dihydroxy-1,3-indanedione, which affords purple or blue colored salts of 2-cyano-1,2,3-trihydroxy-2H...

Some Comments on Qis3