Patent ID: 8921061

Claim:
A test element configured for determining first and second analytes, comprising: a first coenzyme-dependent enzyme or a substrate for the first enzyme, wherein the first analyte is hydroxybutyrate and the first coenzyme-dependent enzyme is a hydroxybutyrate dehydrogenase; a second coenzyme-dependent enzyme or a substrate for the second enzyme, wherein the second analyte is glucose and the second coenzyme-dependent enzyme is a glucose dehydrogenase or a glucose oxidase; and a coenzyme selected from the group consisting of thio-NAD, thio-NADP, and a compound according to formula (I): in which A=adenine or an analog thereof, T=in each case independently denotes O or S, U=in each case independently denotes OH, SH, BH 3 − , or BCNH 2 − , V=in each case independently denotes OH or a phosphate group, W=COOR, CON(R) 2 , COR, or CSN(R) 2 in which R in each case independently denotes H or C 1 -C 2 -alkyl, X 1 , X 2 =in each case independently denote O, CH 2 , CHCH 3 , C(CH 3 ) 2 , NH, or NCH 3 , Y=NH, S, O, or CH 2 , Z=a residue comprising a cyclic group with 5 C atoms which optionally contains a heteroatom selected from O, S and N and optionally one or more substituents, and a residue CR4 2 wherein CR4 2 is bound to the cyclic group and to X 2 , and where R4=in each case independently denotes H, F, Cl, or CH 3 , provided that Z and the pyridine residue are not linked by a glycosidic bond, or a salt or optionally a reduced form thereof.