Steam sterilization indicator

Details Steam sterilization indicator Steam sterilization indicator

1982-09-24

1985-04-30

Marcus, Michael S.

Chemical apparatus and process disinfecting, deodorizing, preser

Process disinfecting, preserving, deodorizing, or sterilizing

Using direct contact steam to disinfect or sterilize

422 56, 422 57, 422119, 436 1, A61L 206, G01N 2180, G01N 3122

Patent

active

045143617

ABSTRACT:
A steam sterilization indicator including a carrier, a pH value indicator that changes color at a predetermined pH value affixed to the carrier and a chemical composition associated with the carrier. The chemical composition contains a mixture of at least two different carboxyl group-containing submixtures, wherein the first carboxyl group containing submixture is a mixture of 2,4-dihydroxybenzoic acid and a metal salt of 2,4-dihydroxybenzoic acid, and the second carboxyl group containing submixture is a mixture of phenylpropiolic acid and a metal salt of phenylpropiolic acid, wherein the molar ratio of the first submixture to the second submixture is about 1:4 to 4:1. Under steam sterilization conditions, the pH value of the chemical composition exceeds the predetermined pH value, causing the pH value indicator to change color and indicate that sterilization is complete.

REFERENCES:
patent: 3000706 (1961-09-01), Royce
patent: 3346464 (1967-10-01), Ernst
patent: 3360338 (1967-12-01), Edenbaum
patent: 3704096 (1972-11-01), Verses et al.
patent: 3862824 (1975-01-01), Chapman
patent: 4410493 (1983-10-01), Joslyn

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