High grade MacConkey Broth w/ Neutral Red is supplied by Micromaster. It is available in the form of a pale yellow to pink homogeneous free flowing powder with a pH in the range of 7.2 to 7.6. For maximum efficiency, it must be stored below 30C in tightly closed container.

Quantity provided: 500g /pack

MacConkey Broth w/ Neutral Red is used for direct inoculation of water samples for coliform counts and microbiological examination of foodstuffs. This medium is also accepted by the Standard Methods for the Examination of Milk and Dairy Products and pharmaceutical preparations. Peptic digest of animal tissue provides necessary nitrogen source. Lactose serves as the fermentable carbohydrate source. Sodium chloride maintains the osmotic balance of the cells. The selective action of these media is attributed to the presence of bile salts, which are inhibitory to most species of gram-positive bacteria. Gram-negative bacteria usually grow well on these media and are differentiated by their ability to ferment lactose. The colour change of the medium shown by lactose-fermenters is due to production of acid from lactose and a subsequent colour change of the indicator dye when the pH of the media falls below 6.8. Lactose non-fermenting strains, such as Shigella and Salmonella do not alter the appearance of the medium. The medium turns pink in case of lactose fermenters and yellow in case of non- lactose-fermenters, due to neutral red. MacConkey Broth, which contains neutral red as an indicator is considered as a standard medium for the primary isolation as well as presumptive identification of coliform-aerogenes group of organisms in food and water.