Culture medium for rapid count of coliform bacteria
First Claim
1. A bacterial culture medium which facilitates the early detection and count of coliform bacteria growing in the medium comprising tryptose, lactose, sodium chloride, bile salts, guar gum and an excess amount of phenol red sufficient to provide a high concentration of phenol red in close proximity to the growing bacteria in order to allow detection and count of the growing bacteria in less than 12 hours.
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Accused Products
Abstract
This invention generally relates to products and processes used to determine the presence of bacteria in a sample and particularly relates to a culture medium which may be used in products and processes to allow early detection and count of coliform bacteria. The bacterial culture medium which facilitates the early detection and count of coliform bacteria is a mixture of tryptose, lactose, sodium chloride, bile salts, guar gum and an excess amount of phenol red sufficient to provide a high concentration of phenol red in close proximity to the growing bacteria in order to allow detection and count of the growing bacteria in less than 12 hours.
89 Citations
19 Claims
- 1. A bacterial culture medium which facilitates the early detection and count of coliform bacteria growing in the medium comprising tryptose, lactose, sodium chloride, bile salts, guar gum and an excess amount of phenol red sufficient to provide a high concentration of phenol red in close proximity to the growing bacteria in order to allow detection and count of the growing bacteria in less than 12 hours.
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7. A method of detecting the presence of coliform bacteria in a sample comprising the steps of adding an aliquot of the sample containing coliform bacteria to a culture medium comprising tryptose, lactose, sodium chloride, bile salts, guar gum and an excess amount of phenol red sufficient to provide a high concentration of phenol red in close proximity to the bacteria;
- growing the bacteria in the presence of the culture medium; and
detecting the color change of the phenol red as the growing bacteria metabolize in less than about 12 hours. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
- growing the bacteria in the presence of the culture medium; and
- 15. A device to detect coliform bacterial growth in a sample consisting essentially of a self-supporting, waterproof substrate, a foam spacer and a transparent cover sheet, wherein a culture medium comprising tryptose, lactose, sodium chloride, bile salts, guar gum and an excess amount of phenol red is coated on the self-supporting, waterproof substrate sufficient to provide a high concentration of phenol red in close proximity of growing bacteria in order to allow detection and count of the growing bacteria in less than 12 hours.
Specification