Supplier: Cayman Chemical

5,5'-Dithiobis(2-nitrobenzoic acid) (Ellmans reagent, DTNB)

Supplier: VWR Chemicals

5,5'-Dithiobis(2-nitrobenzoic acid) (Ellmans reagent, DTNB) ≥98.0%

Supplier: TCI

5,5-Bis(hydroxymethyl)-2-phenyl-1,3-dioxane ≥98.0% (by GC)

Supplier: Cayman Chemical

5,5'-Dithiobis(2-nitrobenzoic acid) (Ellmans reagent, DTNB)

Supplier: Cayman Chemical

5,5'-Dithiobis(2-nitrobenzoic acid) (Ellmans reagent, DTNB)

Supplier: Apollo Scientific

Methyl 2-{3-azaspiro[5.5]undecan-9-yl}acetate hydrochloride

Supplier: TCI

5,5'-Dimethyl-2,2'-bipiperidine (mixture of isomers) ≥98.0% (by titrimetric analysis)

Supplier: Apollo Scientific

5,5',6,6'-Tetrahydroxy-3,3,3',3'-tetramethyl-1,1'-spirobiindane

Supplier: EHRENSTORFER

2,2',5,5'-Tetrachlorobiphenyl (PCB No. 52)

Supplier: LGC Standards PROMOCHEM

2,3,3',4',5,5'-Hexachlorobiphenyl (PCB No. 162)

Supplier: LGC Standards PROMOCHEM

2,3,3',4',5,5',6-Heptachlorobiphenyl (PCB No. 193)

Supplier: LGC Standards PROMOCHEM

2,3,3',5,5',6-Hexachlorobiphenyl (PCB No. 165)

Supplier: LGC Standards PROMOCHEM

2,3,3',5,5'-Pentachlorobiphenyl (PCB No. 111)

Supplier: Thermo Fisher Scientific

3,3',5,5'-Tetra-tert-butyl-4,4'-diphenoquinone 98%

Supplier: Thermo Fisher Scientific

5,5'-Dithiobis(2-nitrobenzoic acid) (Ellmans reagent, DTNB) ≥99%

Supplier: Apollo Scientific

2-{[(2-Fluorophenyl)amino]methylidene}-5,5-dimethylcyclohexane-1,3-dione, tech

Supplier: Cayman Chemical

5,5'-Dithiobis(2-nitrobenzoic acid) (Ellmans reagent, DTNB)

Supplier: Thermo Fisher Scientific

5,5'-Dithiobis(2-nitrobenzoic acid) (Ellmans reagent, DTNB) 99%

Supplier: Apollo Scientific

1,9-Diazaspiro[5.5]undec-3-en-2-one hydrochloride 95+%

Supplier: LGC Standards PROMOCHEM

3,3',5,5'-Tetrachlorobiphenyl (PCB No. 80)

Supplier: LGC Standards PROMOCHEM

2,2',5,5'-Tetrachlorobiphenyl (PCB No. 52)

Supplier: LGC Standards PROMOCHEM

2,3',4',5,5'-Pentachlorobiphenyl (PCB No. 124)

Supplier: Thermo Fisher Scientific

3,3',5,5'-Tetra-tert-butyl-4,4'-diphenoquinone ≥98%

Supplier: Thermo Fisher Scientific

5,5',6,6'-Tetrahydroxy-3,3,3',3'-tetramethyl-1,1'-spirobiindane 97%

Supplier: Apollo Scientific

5,5'-(Hexafluoropropane-2,2-diyl)bis(2-(allyloxy)aniline) ≥95%

Supplier: Apollo Scientific

5,5-Dimethyl-2-[(phenylamino)methylidene]cyclohexane-1,3-dione, tech

Supplier: Apollo Scientific

2-{[(3-Methoxyphenyl)amino]methylidene}-5,5-dimethylcyclohexane-1,3-dione, tech

Supplier: Apollo Scientific

3,3-Dimethyl-1,5-dioxaspiro[5.5]undecan-9-one 98%

Supplier: Apollo Scientific

tert-Butyl 9-cyano-3-azaspiro[5.5]undecane-3-carboxylate, tech

Supplier: MP Biomedicals

3,3',5,5'-Tetramethylbenzidine is suitable as peroxidase substrate for use in ELISA procedures. The substrate produces a soluble end product that is pale blue in color and can be read spectrophotometrically at 370 or 620 to 650 nm. The TMB reaction may be stopped with 2 M H₂SO₄ (resulting in a yellow color), and read at 450 nm. A sensitive and specific reagent for the detection of blood, assay of hemoglobin, assay of peroxidases. It is useful in gel staining procedure for low levels of home-associated peroxidases and for enzyme immunoassay of horseradish peroxidase.