Laura,

Here are two articles that may provide you with additional information on the
use of TTC in plates counts:

M.A. Goshko,  "The use of TTC in USP plate count medium for enumerating low
levels of bacteria from insoluble materials,"  Pharmaceutical Technology ,
November 1984, 58-60.

Ohara, MT. and Saito, T., "Application of Triphenyltetrazolium Chloride in
Microbial Limit Test of Pharmaceuticals and Cosmetics,"  Journal of AOAC
International, Vol 78, No. 6, 1995 1525-1529.

Tina Kramer
TEVA Pharmaceuticals USA


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