What is methyl red test?
Answer Posted / roopasunil
The methyl red test is the "M" portion of the four IMViC
tests used to characterize enteric bacteria. The methyl red
test is used to identify enteric bacteria based on their
pattern of glucose metabolism. All enterics initially
produce pyruvic acid from glucose metabolism. Some enteric
subsequently use the mixed acid pathway to metabolize
pyruvic acid to other acids, such as lactic, acetic, and
formic acids. These bacteria are called methyl-red positive
and include Escherichia coli and Proteus vulgaris. Other
enterics subsequently use the buytylene glycol pathway to
metabolize pyruvic acid to neutral end-products. These
bacteria are called methyl-red-negative and include
Serratia marcescens and Enterobacter aerogenes
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