A new optical detection system using persistent luminescence nanoparticles provides a breakthrough solution for monitoring hydrogen peroxide residues in food, consumer products, and environmental samples without requiring laboratory equipment. Hydrogen peroxide serves as a disinfectant and oxidizing agent in food processing, pharmaceuticals, and consumer products, but excessive residues can degrade nutrients, damage tissues, cause gastrointestinal irritation, and potentially increase cancer risk.
Conventional detection methods including electrochemical sensing, fluorescence probing, and enzyme-based assays often require specialized equipment, continuous excitation, or complex sample preparation. Background autofluorescence in food or biological samples frequently reduces signal clarity and accuracy, creating limitations for real-world applications. The new technology developed by researchers at Chengdu University and Hefei University of Technology addresses these challenges through an innovative approach published in Food Quality and Safety.
The detection system utilizes persistent luminescence nanoparticles coated with a manganese dioxide shell that creates a switchable optical sensing mechanism. In its initial state, the manganese dioxide layer quenches luminescence through interfacial electron transfer, producing a turned-off signal. When hydrogen peroxide is present in a mildly acidic environment, manganese dioxide rapidly reduces to manganese ions, interrupting the quenching pathway and immediately restoring persistent luminescence. This produces a clear, intensity-dependent signal with a detection limit of 0.079 μmol/L, significantly more sensitive than many conventional sensors.
The key innovation lies in overcoming autofluorescence interference, which has long limited optical sensing in real-world food and biological matrices. By using persistent luminescence instead of conventional fluorescence, the method produces clean, high-contrast signals without requiring continuous excitation. The restored red luminescence can be visually recognized under UV illumination, allowing detection to be performed directly on flat plates or paper substrates without instruments.
The probe demonstrated strong anti-interference performance against common ions, sugars, amino acids, and proteins, while exhibiting excellent reproducibility and batch stability. Testing in bottled water, milk, and contact lens solutions yielded recovery rates ranging from 90.56% to 109.73%, confirming reliability in real sample environments. This performance makes the technology particularly valuable for food safety monitoring, environmental inspection, and biomedical assays where laboratory instruments are unavailable.
The autofluorescence-free detection strategy offers practical advantages for rapid, portable detection outside laboratory environments. Future development may enable integration into smart packaging, wearable chemical sensors, and real-time contamination alert systems. By simplifying and accelerating hydrogen peroxide detection, this technology supports safer processing environments and improved consumer product quality assurance across multiple industries. The research represents a significant advancement in chemical sensing technology with broad implications for public health protection and environmental monitoring.
