Abstract: The present invention provides a process for the preparation of a reagent paper for immunological analysis, wherein a fiber fleece of a cellulose/synthetic fiber mixture, in which the weight ratio of cellulose/synthetic fiber is 1 to 90/99 to 10, is activated by treatment with periodate, the so activated fiber fleece is loaded with an acid-treated protein and non-bound protein is removed.The present invention also provides a reagent paper for immunological analysis, wherein it comprises a fiber fleece of a cellulose/synthetic fiber mixture, in which the weight ratio of cellulose/synthetic fiber is from 1 to 90/99 to 10.Furthermore, the present invention is concerned with the use of a fiber fleece of a cellulose/synthetic fiber mixture, wherein the weight ratio of cellulose/synthetic fiber is 90 to 1/10 to 99, as reagent carrier for heterogeneous immunological analysis.

Abstract: Composition for the detection of(a) hydrogen peroxide or hydrogen peroxide forming substrates or(b) peroxidases or peroxidatively reacting substances which composition comprises a substrate capable of coupling and an oxidizable substance known to undergo the Trinder reaction, and(a) a peroxidase or(b) hydrogen peroxidewherein the substrate capable of coupling is a compound of the formula ##STR1## in which n and m are individually selected from whole numbers of 1 to 4,X and Y, which can be the same or different represent a valence bond or a phenylene radical,R.sub.1 and R.sub.2 are individually selected from carboxyl or sulfonic acid groups and one of R.sub.1 and R.sub.2 can also be hydrogen or lower alkyl, andR.sub.3 and R.sub.4 are individually selected from hydrogen and alkyl radicals of up to 6 carbon atoms;and/or a salt of such compound.