Naturally occurring biopterin as a photosensitizer for enhanced photodegradation of sulfonamides in aquatic environments.

Biopterin enhances the photodegradation of sulfonamides in water by over 23 times under sunlight, but produces more toxic by-products.

• Why it matters: Understanding natural photosensitizers like Biopterin is crucial because they influence pollutant breakdown and toxicity in aquatic environments, impacting ecological health and pollution management.
• What they did: The study used simulated sunlight, laser flash photolysis, and DFT calculations to investigate Biopterin’s role, revealing a 69% degradation of sulfamethazine in 3 hours at 5 μM concentration and identifying the triplet excited state as the main active species.
• The result: While Biopterin accelerates antibiotic degradation, it also significantly increases toxicity to aquatic organisms, highlighting the need to consider photoproduct toxicity in water pollution control strategies.