Selective media for yeasts and bacteria in apple juice and cider

From a large number of antibiotics and other inhibitory compounds surveyed in detail, several have been chosen for the selective isolation of yeasts and bacteria from the mixed microfloras of apple juices and ciders. Bacteria were isolated on a basal medium of apple juice plus yeast extract, in the presence of actidione and oxine, while a mixture of actinomycin and Aureomycin allowed the sole growth of yeasts. Diphenyl was also added to the medium for the suppression of moulds in samples heavily infected with these organisms.