CIDEX® OPA solution

CIDEX OPA Solution (containing 0.55% ort/io-phthalaldehyde, OPA, 1) has become the preferred choice over glutaraldehyde (GTA, 2) as a high-level disinfectant for hospital instrument processing. 

The other, preferred new method is hydrogen peroxide oxidation. Hydrogen peroxide (at different concentrations) neutralizes CIDEX OPA Solution almost instantly at room temperature (based on color reaction of OPA with glycine). No color changes are detectable after neutralization. The neutralized solution passes the fish test (this becomes an important criterion if the neutralized solution goes to rivers or oceans). 

---