Lipopolysaccharides obtained from Brucella abortus, B. melitensis, and B. suis, but not B. canis, were found to contain amino sugars identified as glucosamine and quinovosamine by cation exchange and thin-layer cellulose chromatography and ninhydrin degradation.

A major protease present in dormant bark tissues of the apple (Malus domestica Borkh. cv. "Golden Delicious") was partially purified by hemoglobin-coupled Sepharose column chromatography. The protease active at pH 4.6 and at temperatures of 30 to 50 C was found to be sulfhydryl-dependent. Phenylmercuric acetate inhibited the enzyme approximately 50% at 2 millimolar, whereas phenylmethylsulfonyl...

Fingerprints are used since 19th century by Police forces to identify criminals and murderers. In 20th the evolution of science contributed develop forensic methods for revealing latent fingerprints. One most chemical method fingerprints on documents paper objects is made using Ninhydrin. This substance has great results but affecting characteristics ink or other scriptural substances. 21st cen...

Although the validity of the calorimetric determination of single amino acids with ninhydrin, described by Harding and MacLean (l), is unquestioned, the failure of this determination for mixtures of amino acids, together with the observation that ninhydrin produces a color with ammonia (2) and with certain amines and amides (3), seems to have led to the neglect of this useful procedure. The dis...