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Dichloran-Glycerol (DG 18) Agar (RTU)
Dichloran-glycerol (DG-18) agar is recommended for the enumeration of yeasts and molds that develop in products with a low water activity (a w less than 0.95). The media finds particular applications for the enumeration and isolation of xerophilic molds which may be found in dehydrated or extremely dry products, such as heavily sugared or salted foods, dried fruits, cereals, cakes and cookies, flour and meat or fish based dehydrated products.
The media favors a controlled growth regarding the size and breadth of mold mycelia and yeast colonies, allowing easier and more
accurate counts.
The typical composition of the media corresponds to that defined in the standards NF V08-036 & NF ISO 21527-2.
Ready-to-melt medium (with glycerol): 10 vials of 100 ml
Also available as dehydrated medium (without glycerol) 500 g bottle:BK170HA.
In compliance with regulatory requirements, a USDA permit (VS 16-3) is mandatory for shipments from Canada to the USA due to the inclusion of peptone, an animal byproduct.
Tryptone and glucose assure the growth of the yeasts and molds.
The concentration of glycerol at 18% results in a diminution of the water content from 0.999 to 0.955.
Dichloran inhibits the invasion of molds and reduces the size of other colonies.
The presence of Chloramphenicol, a heat resistant antibiotic, reinforces the selectivity of the medium against the majority of bacterial contaminants.
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