Highly sensitive biofunctionalized nanostructures for paper-based colorimetric sensing of hydrogen peroxide in raw milk.

Hydrogen Peroxide (H2O2) is a highly hazardous, toxic, and carcinogenic chemical compound utilised in various industries-based applications. Despite strict restriction, they are deliberately added to food items such as milk as preservatives to increase its shelf life. Herein, we have formulated a green rapid colorimetric nanosensor for detection of H2O2 in milk using cotton leaves as both reducing and functionalizing agent for synthesis of silver nanoparticles (AgNPs). UV-Vis spectra exhibit a strong plasmonic peak at around 434 nm. X-Ray Diffraction (XRD) analysis was performed to determine the crystallinity of the nanoparticles. Field Emission Scanning Electron Microscope (FESEM) and Transmission Electron Microscope (TEM) characterizations revealed spherical morphology with size approximately âˆ¼16 nm. This functionalized nanoparticle could colorimetrically sense presence of H2O2 in milk samples both in liquid media and on paper substrates with Limit of Detection (LOD) of 8.46 ppm even in presence of other interfering substances in milk. This inexpensive route will pave the way for in depth research.

Burkholderia Cepacia Endophthalmitis: An Unusual Presentation.

PURPOSE: To report three cases of Burkholderia cepacia endophthalmitis following uneventful phacoemulsification surgery. CASE REPORT: Three cases presented with blurriness of vision 2 to 3 weeks following phacoemulsification. Vitreous culture confirmed the diagnosis. Pars plana vitrectomy with intravitreal injection of vancomycin (1 mg/0.1 ml) and ceftazidime (2.25 mg/0.1 ml) was performed. Despite several modalities of treatment, 2 cases did not respond to intravitreal antibiotics and vitrectomy. The first case ended up with phthisis bulbi and the second case underwent evisceration. One case improved after intravitreal injection of the first dose of antibiotic. CONCLUSION: B. cepacia endophthalmitis is rare and difficult to treat. More studies are necessary to understand the course and outcome of the infection.