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TOS PROPIONATE AGAR BASE ISO 29981
CAT Nº: 2011
In combination with MUP, al ows the direct detection
FORMULA IN g/l
Galactooligosaccharide TOS 10.00 L-Cysteine HCl Final pH 6.7 ± 0.2 at 25ºC

PREPARATION
Suspend 62.5 grams of the medium in 950 ml of distilled water. Mix well and dissolve by heating with frequent agitation. Boil for one minute until complete dissolution. This medium is heat sensitive. It is recommended to autoclave small quantities (95-190 ml). Sterilize in autoclave at 115±3ºC for 15 minutes. Cool to 48ºC in a water bath and if desired, aseptical y add two vials of MUP Selective Supplement (Cat. 6074) reconstituted in 5 ml of sterile distilled water. Homogenize gently and dispense into sterile containers. The prepared medium should be stored at 2-8°C. The color of the prepared medium is amber. The dehydrated medium should be homogeneous, free-flowing and beige in color. If there are any physical changes, NOTE: After autoclaving the medium is slightly opalescent. The opalescency disappear when the medium is cooled to 48±1ºC. The base is stable during 4 hours in a water bath. MUP SELECTIVE SUPPLEMENT (CAT. 6074)
Lithium-Mupirocin (MUP)…………………………………………25 mg TOS PROPIONATE AGAR BASE is a medium according to ISO 29981 for the direct detection of viable Bifidobacteria. The method is applicable to milk products such as fermented and non-fermented milks, milk powders, infant formulae, and starter cultures where these microorganisms are present and viable, and in combination with other lactic acid bacteria. Casein peptone provides nitrogen, vitamins, minerals and amino acids essential for growth. Yeast extract is source of vitamins, particularly the B-group. Magnesium sulfate al ows the detection of smal numbers or injured Bifidobacteria. Ammonium sulfate acts as a nitrogen source during growth. Potassium phosphates act as a buffer system. L-Cysteine hydrochloride is the reducing agent. TOS enhances the growth of bifidobacteria used in dairy products as is an specific growth factor for all bifidobacteria whereas other lactic acid bacteria cannot utilize this saccharide. Sodium Propionate inhibits the accompanying flora. The antibiotic, mupirocin lithium salt (MUP), inhibits the growth of most lactic acid bacteria commonly used in fermented and non-fermented dairy products. Inoculate and incubate at 37°C for 72±3 hour under anaerobic conditions. LABORATORIOS CONDA, S.A.
MICROBIOLOGICAL TEST
The following results were obtained from type cultures in the performance of the medium after incubation at a temperature of 37 ± 2ºC, under anaerobic conditions, and observed after 72 ± 3 hours. Microorganisms
Colony Color
Streptococcus thermophilus ATCC 19258 BIBLIOGRAPHY
ISO 29981/ IDF 220. Milk products – Enumeration of presumptive bifidobacteria – Colony count technique at 37ºC (2010) Once opened keep powdered medium closed to avoid hydration. LABORATORIOS CONDA, S.A.

Source: http://www.condalab.com/pdf/2011.pdf

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