6.5% sodium chloride glucose agar

6.5% sodium chloride glucose agar

6.5% sodium chloride and glucose agar is a hypertonic differential medium for bacterial salt tolerance test. Its basic components are peptone and beef extract powder, and its key feature is that 6.5% sodium chloride is added to create a high osmotic pressure environment, and glucose is used as a carbon source and bromocresol purple is used as an acid-base indicator. The culture medium is mainly used for identification of enterococci: the target bacteria can grow in this high-salt environment and ferment glucose to produce acid, so that the culture medium changes from purple to yellow; However, the growth of most streptococci was inhibited. This test is an important biochemical index to identify gram-positive cocci.

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