Abstract: N-Acetyl-.beta.-D-glucosaminides produced from 1-chloro-1-deoxy-2,3,4,6-tetraacetyl-.alpha.-D-glucosamine and indicators for titration as the aglycons useful as substrates in kits for diagnostic aid, with which N-acetyl-.beta.-D-glucosaminidase activity can be determined colorimetrically in high sensitivity, precisely, and quickly.

Abstract: N-Acetyl-.beta.-D-glucosaminides produced from 1-chloro-1-deoxy-2,3,4,6-tetraacetyl-.alpha.-D-glucosamine and indicators for titration as the aglycons useful as substrates in kits for diagnostic aid, with which N-acetyl-.beta.-D-glucosaminidase activity can be determined colorimetrically in high sensitivity, precisely, and quickly.

Abstract: A system composed of a complex of a chelating agent with a polyvalent metal ion in its higher valency, an indicator capable of reacting with said metal ion in its lower valency and a buffering agent is disclosed as a composition and a test strip useful for colorimetric analysis of ascorbic acid present in body fluid.

Abstract: A test strip for detecting the presence of occult blood in excreta such as urine or feces or body fluid, which strip comprises a bibulous or porous material impregnated with a chromogen, a hydroperoxide and, as a sensitizer, a thiazole compound of the formula: ##STR1## wherein R.sub.1 is a lower alkyl; a substituted or unsubstituted aralkenyl, or a substituted or unsubstituted aralkyl; R.sub.2 and R.sub.3 are each a hydrogen or a lower alkyl; and R.sub.2 and R.sub.3, when taken together with the adjacent carbon atoms, may form a benzene ring.

Abstract: A test strip for the detection of phenylketone bodies in the body fluids, especially in the urine, comprising an absorbing material, a ferric salt and an iron-chelating agent. The test strip is useful in early diagnosis of phenylketonuria, inborn disorder of phenylalanine metabolism.