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Principle
- Koser citrate medium is described by Koser (1923), as media composed of sodium ammonium phosphate, monobasic potassium phosphate, magnesium sulfate, and sodium citrate.
- This media lacks organic carbon and nitrogen source. Sodium ammonium phosphate and sodium citrate are sources of carbon and nitrogen. Monobasic potassium phosphate and sodium ammonium phosphate act as buffering agents. Magnesium sulfate is the source of ions.
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Use: Recommended for differentiating Escherichia coli from Enterobacter aerogenes based on citrate utilization.
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PARAMETERS
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STANDARD VALUES
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PHYSICAL PARAMETERS:
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Dehydrated Powder
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Description
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A fine, free flowing, hygroscopic powder.
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Color
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White colored powder.
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Solution
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Solubility
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Soluble in Distilled / de-ionized water at 50˚ C
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Color
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Colorless clear solution
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pH
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6.8 ±0.2 at 25 ˚C (5.70 g/ l)
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