Cystine Tryptic Agar- Composition, Principle, Preparation, Results, Uses


Cystine Tryptic Agar (CTA) is a semi-solid medium that contains cystine and peptone as the main sources of nutrients for the growth of fastidious microorganisms. CTA can be supplemented with different carbohydrates and a pH indicator to detect fermentation reactions. CTA can also be used to test for bacterial motility by observing the extension of growth from the stab line of inoculation.