Anthranoid free radicals found in pseudomelanosis coli

Area of Science:

• Gastroenterology
• Dermatology
• Spectroscopy
• Toxicology

Background:

• Pseudomelanosis coli is a benign condition resulting from prolonged ingestion of anthranoids.
• The pigmentation associated with pseudomelanosis coli typically resolves without adverse effects upon discontinuation of the causative agent.
• Previous studies suggest a lack of carcinogenicity and genotoxicity associated with these pigments.

Purpose of the Study:

• To analyze the Electron Spin Resonance (ESR) spectra of pseudomelanosis coli pigments.
• To compare these spectra with those of anthralin-induced skin pigmentation and in vitro-formed anthralin brown material.
• To investigate the stability and bio-inertness of anthranoid-derived pigments.

Main Methods:

• Electron Spin Resonance (ESR) spectroscopy was employed to analyze pigment samples.
• Specimens included pseudomelanosis coli tissue, pigmented skin scales from psoriatic patients treated with anthralin, and in vitro-generated anthralin brown material.
• ESR spectra were compared for characteristic g values and signal stability over time.

Main Results:

• Comparable g values were observed across all examined specimens within measurement accuracy.
• The ESR signal intensity demonstrated remarkable stability, remaining constant for up to four years.
• The brown pigments derived from anthranoids exhibit stable chemical and physicochemical properties.

Conclusions:

• The ESR findings support the bio-inert nature of pseudomelanosis coli pigments.
• The stability and chemical properties of these pigments explain their apparent lack of toxicity.
• Anthranoid-derived pigments, including those in pseudomelanosis coli, are likely non-carcinogenic and non-genotoxic.