Description

Violet Red Lactose Bile Agar (VRBA) is a selective medium racommended by APHA and ISO 4832:2006 and for the isolation, cultivation and count of Coliforms, from dairy product, foods and milk.

Coliforms (Enterobacter, Klebsiella, Citrobacter e Escherichia) have the characteristic of fermenting lactose forming red-violet colonies, for the presence of neutral red and crystal violet, while precipitation of bile salts, determines the appearance of halo around the colonies.

Packing:

• Cod. H70.200 Pack. 10 bags /385 g Hydrobag® (1 x 1 litre of medium) 
• Cod. B70.200 Pack. 5 Kg
• Cod. 70.200 Pack. 500 g
• Cod. 71.200 Pack. 100 g
• Cod. 14.0083V Pack. 20 plates ø 90 mm, ready to use
• Cod. 11.0045 Pack. 20 contact plates ø 55 mm, ready to use
• Cod. 60.39V Pack. 20 plates ø 60 mm, ready to use
• Cod. 90.052 Pack. 10 test-tubes 22 ml, ready to use

Bibliography:

• ISO 5541-1 (1986). Milk and Milk Products. enumeration of coliforms. Colony count technique at 30ºC.
• UNI ISO 4832:1988 Microbiologia. Direttive generali per il conteggio dei coliformi. Metodo per il conteggio delle colonie ottenute a 30°C.
• ISO 4831:1991 Microbiology - General guidance for the enumeration of coliforms -- Most probable number technique
• ISO 4832:2006 Microbiology of food and animal feeding stuffs -- Horizontal method for the enumeration of coliforms -- Colony-count technique
• AFNOR NF ISO 4832:2006 Microbiology of food and animal feeding stuffs -- Horizontal method for the enumeration of coliforms -- Colony-count technique