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US 4,062,876 AGranted
Sensitive pH indicator
AssigneeMcDonnell Douglas Corporation
InventorsClifton Aldridge, Michael C. Meyer
Life of this patent
Estimating the term…
Abstract
Process of preparing reduced aniline blue pH indicator for use in detecting presence of microorganisms in culture media. The process involves reducing aniline blue by the sequential addition of sodium thioglycollate. The reduced aniline blue indicator may be used in certain media designed for use in the cards and wells of the mechanism described in applications AUTOMATED MICROBIAL ANALYZER and MACHINE AND PROCESS FOR READING CARDS CONTAINING SPECIMENS.
Claims5
A process for reducing aniline blue in order to make it suitable for detecting minute changes in pH comprising the steps of
- a. dissolving water-soluble aniline blue in an alkaline solution,
- b. boiling the solution of step (a) in the presence of sodium thioglycollate until the aniline blue is reduced.
Dependencies are inferred from the claim text.