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An authoritative technical evaluation for procurement directors, QA chemical engineers, and healthcare supply chain executives.
Ortho-Phthalaldehyde (CAS Registry Number: 643-79-8; Molecular Formula: C₈H₆O₂), commonly designated as OPA or 1,2-Benzenedicarboxaldehyde, represents a crucial milestone in chemical biocides and high-level disinfection (HLD) technologies. Characterized by two adjacent formyl groups attached to a benzene ring, OPA exhibits rapid bactericidal, mycobactericidal, and virucidal efficacy even at low ambient temperatures. Compared to legacy aldehyde sterilants such as Glutaraldehyde, OPA offers minimal vapor emission pressure, eliminating the need for complex localized exhaust ventilation systems during medical instrument processing.
Beyond its dominant clinical application in reprocessible flexible endoscopes and surgical instrumentation, Ortho-Phthalaldehyde serves as a indispensable diagnostic reagent in fluorometric amino acid derivatization (via mercaptoethanol coupling) and acts as a high-purity chemical intermediate in the synthesis of pharmaceuticals, phthalocyanine dyes, and specialty biocide formulations.
| Specification / Metric | Ortho-Phthalaldehyde (OPA) | Glutaraldehyde (2.4%) | Peracetic Acid (PAA) |
|---|---|---|---|
| CAS Registry No. | 643-79-8 | 111-30-8 | 79-21-0 |
| Typical Active Concentration | 0.55% - 0.60% w/w | 2.4% - 3.4% w/w | 0.2% - 0.35% w/w |
| High-Level Disinfection Time | 5 - 12 Minutes (Fastest) | 20 - 45 Minutes | 10 - 15 Minutes |
| Vapor Pressure & Odor | Extremely Low (<0.005 mmHg) | High (Irritating fumes) | Pungent acetic odor |
| Activation Requirement | None (Ready-to-Use) | Requires liquid/powder activator | Requires mixing buffer |
| Material Compatibility | Excellent (Metals, Elastomers, Lenses) | Good (Slight protein coagulation) | Corrosive to copper/brass |
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China leading chemical production facilities utilize continuous gas-phase or liquid-phase microreactors for catalytic oxidation of o-xylene or phthalic acid derivatives. This continuous micro-channel synthesis eliminates batch-to-batch variance, lowers thermal degradation, and achieves unmatched 99.5%+ crystalline purity.
Unreacted phthalic anhydride, phthalic acid, and iso-phthalaldehyde residues can diminish biocide efficacy and cause solution discoloration. Our specialized secondary crystallization protocols ensure total organic impurities remain below 0.2%, fulfilling rigorous healthcare and analytical reagent grades.
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OPA serves as the core active ingredient in automated endoscope reprocessors (AER). Operating at a stable 0.55% aqueous dilution, it achieves complete destruction of Mycobacterium tuberculosis, Pseudomonas aeruginosa, and resistant spore strains in under 12 minutes without requiring chemical buffering or temperature elevation above room ambient (20°C).
In biochemistry and clinical assay kits, OPA reacts specifically with primary amines in the presence of nucleophilic thiols (such as N-acetyl-L-cysteine or 3-mercapto-propionic acid) to generate highly fluorescent isoindole adducts. This enables ultra-sensitive HPLC quantification of amino acids, neuro-transmitters, and peptide fragments.
The dual aldehyde reactivity allows Ortho-Phthalaldehyde to act as a versatile building block for heterocyclic ring construction, quinoline derivatives, ISO-indoline based API synthesis, and modern cross-linking agents for biological polymers and protein immobilization matrixes.
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