Mineral salts pyridine broth is a selective medium for bacteria that can metabolize pyridine (which is an unusual carbon source that a select few types of bacteria can use). This medium is used to isolate bacteria belonging to the genus Arthrobacter among other bacteria genera.
{| class="wikitable" style="width:20em"
|+ Mineral Salts Pyridine Broth
! Ingredient || g/L
|-
|Na<sub>2</sub>HPO<sub>4</sub> || 1.6
|-
|KH<sub>2</sub>PO<sub>4</sub> || 21.0
|-
|(NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub> || 2.6
|-
|MgSO<sub>4</sub>*7H<sub>2</sub>O || 0.1
|-
|Pyridine (Sole C source) || 2.0
|}