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  • Contact dermatitis with clostridiopeptidase A contained in Noruxol ointment.

Contact dermatitis with clostridiopeptidase A contained in Noruxol ointment.

Contact dermatitis (2007-06-20)
Caterina Foti, Anna Conserva, Claudia Casulli, Valentina Scrimieri, Maria Luisa Pepe, Domenico Quaranta
ABSTRACT

Clostridiopeptidase A, also called collagenase 1, is a proteolytic enzyme capable of digesting collagen. Preparations containing clostridiopeptidase A are used topically for the debridement of dermal ulcers, burns and other necrotic lesions to facilitate the formation of granulation tissue and subsequent epithelization. We observed 4 patients with a periulcerative eczema after repeated applications of Noruxol ointment (Smith & Nephew Ltd, L Hull, UK). Patch testing with Noruxol ointment as is and its excipients (soft paraffin and white petrolatum), as well as scaled dilutions of the main ingredient of this topical preparation, clostridiopeptidase A (Firma, Florence, Italy), showed doubtful reactions to Noruxol ointment in 3 patients and a positive reactions only in 1 patient. All patients showed positive reactions to clostridiopeptidase A 1% in pet. This study shows the sensitizing capacity of clostridiopeptidase A that should be tested in all patients with suspect sensitization to Noruxol ointment.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Collagenase from Clostridium histolyticum, Sigma Blend Type F, ≥2.0 FALGPA units/mg solid
Sigma-Aldrich
Collagenase from Clostridium histolyticum, Sigma Blend Type H, ≥1.0 FALGPA units/mg solid