Stable NAD/NADH derivatives
View Patent ↗The present invention provides for stable nicotinamide adenine dinucleotide (NAD/NADH) and nicotinamide adenine dinucleotide phosphate (NADP/NADPH) derivatives of formula (I), enzyme complexes of these derivatives and their use in biochemical detection methods and reagent kits.
1. A test element configured for determining glucose, comprising (i) a coenzyme-dependent enzyme comprising glucose dehydrogenase or a substrate for such an enzyme and (ii) a compound of the following general formula (I) as the coenzyme:
in which
A=adenine or an analogue thereof,
T=in each case independently denotes O, S,
U=in each case independently denotes OH, SH, BH 3 − , BCNH 2 − ,
V=in each case independently denotes OH or a phosphate group,
W=COOR, CON(R) 2 , COR, 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, NCH 3 ,
Y=NH, S, O, 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 ,
where R4=in each case independently denotes H, F, Cl, 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.
2. The test element according to claim 1 , wherein the substituents on Z are selected from the group consisting of OH, F, Cl and C 1 -C 2 -alkyl which is optionally fluorinated or chlorinated or/and OH-substituted, O—C 1 -C 2 -alkyl.
3. The test element according to claim 1 , comprising a compound of the following formula (I′) as the coenzyme:
in which
A=adenine or an analogue thereof,
T=in each case independently denotes O, S,
U=in each case independently denotes OH, SH, BH 3 − , BCNH 2 − ,
V=in each case independently denotes OH or a phosphate group,
W=COOR, CON(R) 2 , COR, 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, NCH 3 ,
Y=NH, S, O, CH 2 ,
Z=a saturated or unsaturated carbocyclic or heterocyclic five-membered ring of the general formula (II)
in which a single or double bond can be present between R5′ and R5″, in which
R4=in each case independently denotes H, F, Cl, CH 3 ,
R5=CR4 2 ,
if a single bond is present between R5′ and R5″, then
R5′=0, S, NH, NC 1 -C 2 -alkyl, CR4 2 , CHOH, CHOCH 3 ,
R5″=CR4 2 , CHOH, CHOCH 3 ,
if a double bond is present between R5′ and R5″, then R5′=R5″=CR4,
R6, R6′=in each case independently denote CH, CCH 3
or a salt or optionally a reduced form thereof.
4. The test element according to claim 1 , wherein W=CONH 2 or COCH 3 .
5. The test element according to claim 1 , wherein the test element comprises a test strip configured for carrying the enzyme and coenzyme.
6. A method of determining an analyte comprising the steps of (a) providing a test element according to claim 1 ; (b) contacting the test element with a sample; (c) measuring a value relating to a change in one of the enzyme and coenzyme; and (d) correlating the value to a concentration of the analyte, wherein the analyte is at least one of the analytes selected from the group consisting of glucose, lactic acid, malic acid, glycerol, alcohol, cholesterol, triglycerides, ascorbic acid, cysteine, glutathione, peptides, urea, ammonium, salicylate, pyruvate, 5′-nucleotidase, creatine kinase (CK), lactate dehydrogenase (LDH) and carbon dioxide.
7. The test element according to claim 1 , wherein
A=adenine,
T=in each case denotes O,
U=in each case denotes OH,
V=in each case denotes OH,
W=CON(R) 2 in which R denotes H,
X 1 =O,
X 2 =O,
Y=O, and
Z=a saturated carbocyclic 5-membered ring of the general formula (II)
in which a single bond is present between R5′ and R5″, and in which
R4=H,
R5=CR4 2 ,
R5′=CHOH,
R5″=CHOH,
R6=CH, and
R6′=CH.
8. The test element according to claim 1 , the test element being configured for determining glucose in a sample comprising one of a body fluid, waste water, and food.
9. The test element according to claim 1 , the test element being in the form of a dry test wherein the enzyme or substrate for such enzyme and the compound are provided as a swellable or absorbent material that is wetted by a sample liquid for determining glucose.
10. A compound of the general formula (I″):
in which
A=adenine or an analogue thereof,
T=in each case independently denotes O, S,
U=in each case independently denotes OH, SH, BH 3 − , BCNH 2 − ,
V=in each case independently denotes OH or a phosphate group,
W=COOR, CON(R) 2 , COR, 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, or NH,
Y=NH, S, O, CH 2 ,
Z=a saturated or unsaturated carbocyclic or heterocyclic five-membered ring of the general formula (II)
in which a single or double bond can be present between R5′ and R5″,
R4=in each case independently denotes H, F, Cl, CH 3 ,
R5=CR4 2 ,
if a single bond is present between R5′ and R5″, then
R5′=O, S, NH, NC 1 -C 2 -alkyl, CR4 2 , CHOH, CHOCH 3 ,
R5″=CR4 2 , CHOH, CHOCH 3 ,
if a double bond is present between R5′ and R5″, then R5′=R5″=CR4,
R6, R6′=in each case independently denote CH, CCH 3
provided that if R5=CH 2 , T=O, U=in each case OH, V=OH, W=CONH 2 , X 1 , X 2 =O and Y=O, then R5′ and R5″ are not simultaneously CHOH,
or a salt or optionally a reduced form thereof.
11. The compound according to claim 10 , wherein at least one residue U is different from OH.
12. The compound according to claim 11 , wherein at least one residue U=BH 3 − .
13. The compound according to claim 10 , wherein W=CONH 2 or COCH 3 .
14. The compound according to claim 10 , wherein a first residue V is an OH group and a second residue V is a phosphate group, and wherein the OH group and the phosphate group are able to form a cycle with the carbon atoms to which they are bound.
15. The compound according to claim 10 , wherein R5′=CR4 2 or CHOH.
16. The compound according to claim 10 , wherein R5′ is O.
17. The compound according to claim 10 , wherein R5′=NH or NC 1 -C 2 -alkyl.
18. An enzyme-coenzyme complex comprising a compound according to claim 10 in combination with a suitable enzyme.
19. The complex according to claim 18 , wherein the enzyme is a dehydrogenase selected from the group consisting of glucose dehydrogenase (E.C.1.1.1.47), lactate dehydrogenase (E.C.1.1.1.27, 1.1.1.28), malate dehydrogenase (E.C.1.1.1.37), glycerol dehydrogenase (E.C.1.1.1.6), alcohol dehydrogenase (E.C.1.1.1.1), alpha-hydroxybutyrate dehydrogenase, sorbitol dehydrogenase, and an amino acid dehydrogenase comprising L-amino acid dehydrogenase (E.C.1.4.1.5).
20. A method for detecting an analyte in a fluid sample comprising the steps of (a) providing a test element, the test element carrying a compound according to claim 10 and an enzyme; and (b) analyzing an enzymatic reaction involving the analyte and correlating a change in the compound or the enzyme to a quantity of the analyte.
21. A reagent kit comprising in combination a compound according to claim 10 , a suitable enzyme, and a suitable reaction buffer.
22. The reagent kit according to claim 21 , wherein the enzyme is a dehydrogenase selected from the group consisting of glucose dehydrogenase (E.C.1.1.1.47), lactate dehydrogenase (E.C.1.1.1.27, 1.1.1.28), malate dehydrogenase (E.C.1.1.1.37), glycerol dehydrogenase (E.C.1.1.1.6), alcohol dehydrogenase (E.C.1.1.1.1), alpha-hydroxybutyrate dehydrogenase, sorbitol dehydrogenase, and an amino acid dehydrogenase comprising L-amino acid dehydrogenase (E.C.1.4.1.5).
23. A method for detecting an analyte comprising the steps of:
(a) contacting a sample with a reagent kit according to claim 21 ; and
(b) detecting the analyte.
24. The method according to claim 23 , wherein the analyte is detected photometrically or fluorometrically.
25. The compound according to claim 10 , wherein the compound comprises carbaNADP or a salt or a reduced form thereof.