Oxidase Reagent according to Gaby-Hadley B

suitable for microbiology

Gaby-Hadley Reagent B

Quality Level


according to ISO 9308-1:2014

product line


shelf life

limited shelf life, expiry date on the label


N,N-dimethyl-p-phenylenediamine (oxalate), 0.1 g
dist. water, 100 mL


microbe id | specific enzyme detection: suitable
microbiology: suitable (microbial identification)

Featured Industry

Clinical Testing
Food and Beverages

antibiotic activity spectrum

Gram-negative bacteria


Plesiomonas spp.
Aeromonas spp.
Neisseria spp.
Pseudomonas spp.

General description

Oxidase Reagent can be used to detect oxidase positive organisms. The reagent is colorless in its reduced state and dark purple in its oxidized state. On applying to an oxidase-positive colony, it changes color.


The reagent is used for detection of oxidase activity of a bacterial culture along with Oxidase Reagent A according to Gaby-Hadley.

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves


NONH for all modes of transport

Flash Point F

Not applicable

Flash Point C

Not applicable

Neelima Garg
Laboratory Manual of Food Microbiology (2010)
Vibrios are motile, curved or comma-shaped bacilli and have a single polar flagella with sheet proteins. They are often found in open water, freshwater and saltwater.
Más información
On the Trail of Campylobacter - The Campylobacter is one of the leading causes of human gastroenteritis. Common Campylobacter species C. jejuni, C. coli, and C. lari are responsible for most cases of campylobacteriosis. However, other species, like C. fetus, which causes spontaneous abortions, have also been associated with human illness. Campylobacter are Gram-negative, spiral-shaped, microaerophilic and motile bacteria with uni- or bi-polar fl agella
Más información
Chromogenic media enable the selective detection of S. aureus, which produce bluish-green colonies that are clearly differentiated from other species.
Más información
For microbiologists the most fundamental stain was developed in 1884 by the Danish bacteriologist Hans Christian Gram.
Más información
General guidance for the detection and enumeration of Enterobacteriaceae in food according to EN-ISO 8523:1991 and EN-ISO 4832:1991, respectively.
Más información
In recent years it has been recognized that Listeria is an important public health problem. The disease affects primarily people of advanced age, pregnant women, newborns, and adults with weakened immune systems.
Más información

Nuestro equipo de científicos tiene experiencia en todas las áreas de investigación: Ciencias de la vida, Ciencia de los materiales, Síntesis química, Cromatografía, Analítica y muchas otras.

Póngase en contacto con el Servicio técnico

Redes sociales

LinkedIn icon
Twitter icon
Facebook Icon
Instagram Icon


Investigación. Desarrollo. Producción.

Somos un proveedor líder para la industria de Ciencias de la Vida con soluciones y servicios para investigación, desarrollo y producción biotecnológicos, y para desarrollo y producción de tratamientos farmacéuticos

© 2021 Merck KGaA, Darmstadt, Alemania y/o sus filiales. Todos los derechos reservados.

Queda estrictamente prohibida la reproducción sin permiso de cualquiera de los materiales de la página web.