Merck Patent Gesellschaft MIT Beschrankter Haftung

Rainer Klink

Roland Helger

Uwe Wurzburg

Eberhard Henkel

Barkew Dolabdjian

Joachim Krause

Rudolf Eidenschink

Ludwig Pohl

Fernando Del Pino

A process and a reagent for the determination of .alpha.-amylase involve enzymatic splitting of an .alpha.-amylase substrate in the presence of .alpha.-glucosidase and .beta.-glucosidase and measurement of a fission product. As substrate, there is used a 4-nitrophenyl-.beta.,D-maltoheptaoside electronegatively substituted in the phenyl nucleus.

Process and reagent for the determination of .alpha.-amylase

A process and reagent are described for the determination of .alpha.-amylase by enzymatic splitting of an .alpha.-amylase substrate in the presence of .alpha.-glucosidase and .beta.-glucosidase and measurement of a fission product. The substrate utilized is a 4-nitrophenyl-.beta.,D-maltoheptaoside substituted in the phenyl ring by an electron withdrawing group, preferably a 2-chloro group.

A liquid crystalline dielectric composition contains 0.001-5% by weight of a monocyclic or bicyclic amino compound of the formula ##STR1## wherein R.sub.1 and R.sub.2 each are hydrogen or collectively are CH.sub.2 --(CH.sub.2 --Z--CH.sub.2).sub.p --CH.sub.2 ; X is --CH.sub.2 or --CO--; Y is --Z--CH.sub.2 --CH.sub.2 -- or ##STR2## Z is O, S, or NH; m and n are 0, 1 or 2; p is 1, 2 OR 3; OR AN ACID ADDITION SALT OR METAL SALT CHELATE COMPLEX THEREOF.

Liquid crystalline dielectric composition

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Darmstadt, Germany

Rainer Klink