Antibacterial tests on
Mycobacterium tuberculosis H
37Rv,
Staphylococcus aureus 209P,
Bacterium coli communior type, and
Bacillus subtilis were carried out with 95 kinds of cyanoacetylhydrazone, benzoylhydrazone,
p-aminobenzoylhydrazone, and
o- and
p-hydroxybenzoylhydrazone of aldehydes and ketones. Growth inhibition on tubercle bacilli was shown by cyanoacetylhydrazones of isovaleraldehyde, β-orcilaldehyde, 2-hydroxynaphthaldehyde,
p-methoxybenzalacetone, and
p-nitrobenzalacetone, and
p-aminobenzoylhydrazone of usnic acid and 2-butanone in 12.5γ/cc. concentration, and by cyanoacetylhydrazones of
m-hydroxybenzaldehyde, orcilaldehyde, orcilaldehyde dimethyl ether, cinnamaldehyde, ethyl acetoacetate, cyclohexanone, usnic acid, and salicylalacetone, by
o-hydroxybenzoylhydrazones of perillaldehyde and cyclohexanone, and by
p-hydroxybenzoylhydrazone of vanillin methyl ether in 25γ/cc. concentration. Growth inhibition of the staphylococci was shown by cyanoacetylhydrazone of cinnamaldehyde in 12.5γ/cc. and by cyanoacetylhydrazone of 3-chloro-2, 4-dihydroxy-5-iaoamylbenzaldehyde,
o-hydroxybenzoylhydrazone of divaraldehyde, and by benzoylhydrazone of usnic acid in 25γ/cc, concentration. Growth inhibition of
Bac. subtillis was shown by cyanoacetylhydrazone of usnic acid in 12.5γ/cc. and by benzoylhydrazone of usnic acid in 25γ/cc. concentrations. All of these compounds showed only a weak growth inhibitory action against coli bacilli type.
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