Tryptic Soy Agar acc. to EP/USP/JP with LTH (TSA-LTH)

Recommended by the Harmonised European Pharmacopoeia, supplemented with Lecithin, Polysorbate 80 (Tween 80) and L-Histidine


Shorthand symbol: TSA-LTH
Item number: 40-1531
Format: Petri Dish, 90mm
Colour: Yellowish
Storage conditions: Dry, in closed bag, at 15 – 22°C.
Shelf-life: 6 Months
pH: 7.3 ± 0.2 at 25°C
1531 caseinpepton sojamehlpepton agar mit enthemmer tsa lth xebios
Intented use and fields of application

Tryptone Soya Agar is a very nutrient-rich universal growth for the microbiological examination of non-sterile products. A general purpose agar medium, containing two peptones, which will support the growth of a wide variety of organisms. It is suitable for the cultivation both of aerobic and anaerobic bacteria, the latter being grown either in deep cultures or by incubation under anaerobic conditions as well as yeasts and moulds.

The high numbers of microorganisms detectable using Tryptone Soya Agar is due to the addition of peptones gained from enzumatic hydrolysis of casein protein and soya proteins. It therfore includes - besides others - the detection of Listeria spp, Pasteurella spp, Vibrio spp, Haemophilus vaginalis or Candida spp.

Tryptone Soya Agar contains no carbohydrates so it can be used in the investigation of haemolytic reactions. The Pharmacopeia European (PhEur) recommends TSA for the enumeration of Total Viable Count in products under examination for microbial load.

The addition of Lecithin, Tween 80 and Histidine components neutralise the inhibotory effects of aldehydes, phenols, Hexachlorophene, chlorhexidine, formaldehyde and quarternary ammonium compounds used for preservatives and cleaning and disinfection agents.


Typical composition in g/l

in g per 1 litre of Nutrient medium
Pancreatic-digest of Casein Peptone15.0
Enzyme-digest of Soya Bean Pepton5.0
Sodium Chloride 5.0
Lecithin 0.7
Tween 80 5.0
L-Histidine 0.5
Agar15.0


Microbiological quality control

The Microbiological Performance Test is carried out in accordance with the requirements of PhEur. (Microbiological Examination of Non-Sterile Products in accordance with Chapter 2.6.13).


Productivity
Incubation conditions: 2–3 days at 30–35°C; Inoculum concentration: 10–100 CFU

OrganismType StrainSpecificationColony morphology
Staphylococcus aureusATCC 6538 / WDCM 0003250–200 %Medium, slightly yellowish colonies
Pseudomonas aeruginosaATCC 9027 / WDCM 0002650–200 %Medium, slightly yellowish colonies
Bacillus subtilisATCC 6633 / WDCM 0000350–200 %Large, flat, dry, irregularly shaped colonies
Candida albicansATCC 10231 / WDCM 0005450–200 %Small, white, dry colonies
Aspergillus brasiliensisATCC 16404 / WDCM 0005350–200 %Dark brown to black conidia on light mycelium
Candida albicans
(3–5 days at 20–25°C)
ATCC 10231 / WDCM 0005450–200 %Small, white, dry colonies
Aspergillus brasiliensis
(3–5 days at 20–25 °C)
ATCC 16404 / WDCM 0005350 – 200 %Dark brown to black conidia on light mycelium


Microbial contamination
Incubation conditions: 5–7 days at 20–25°C and 5–7 days at 30–35 °C

Specification
No growth present


Documents Productinformation Safty information