Polygalacturonic acid*
(or pectin) 4.6 g
Yeast extract 5 g
Proteose peptone No.3 5 g
K2HPO4 5 g
Sodium thioglycolate 5 g
Agar (if needed) 20 g
Distilled water 1000 ml
pH 7.5
*Dissolve polygalacturonic acid in small amounts
of distilled water neutralized with 10% NaOH to pH
7.2. Mix intensively.