One-drop micro-array towards accelerated optical quantification of dopamine in human biofluids using triangular silver nanoparticles: Smartphone-assisted biomedical analysis by colorimetric sensing and Lab-on-paper technology

The research aimed to observe the influence of the storage conditions of silver colloidal solutions prepared by biological (green) and chemical methods on their long-term stability. Green methods for reducing and stabilizing silver nanoparticles (AgNPs) use natural substances. The rosemary leaf extract was used for AgNPs synthesis, and prepared nanoparticles were spherical (average size of 12 nm). In the chemical method, commercial chemicals (NaBH4, TSC, PVP, and H2O2) were used, and two colloids were prepared; the first contained spherical nanoparticles with an average size of 8 nm, and the second triangular prisms with an average size of 35 nm. The prepared colloids were stored under four conditions: at room temperature in the light and the dark, and at a temperature of 5 °C (refrigerator) in the light and the dark. The results confirmed the influence of storage conditions on the stability of nanoparticles. Colloids stored at 5 °C in the dark show the best stability. However, differences in stability dependent on the shape of nanoparticles prepared by chemical method were also observed; triangular nanoparticles showed the least stability. Methods such as UV–vis spectrophotometry, TEM, and EDX were used to analyze the nanoparticles before and after storage.

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Advanced Colorimetric Sensors: Cutting-Edge Materials and Smart Approaches

Ozturk Kirbay

2024

Current Developments in Biosensor Applications and Smart Strategies [Working Title]

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Color is a captivating aspect of our perception, profoundly influencing how we interact with and interpret the world. As a fundamental element of visual experience, it shapes emotions, preferences, and even physiological responses. Beyond its esthetic and emotional impact, color serves practical purposes across various fields, including medicine for diagnostics and therapeutic applications and in industrial sectors for quality control and product identification. Colorimetric sensors that are user-friendly, portable, instrument-free, and low cost, yet provide sensitive and selective detection for various analytes, are essential for point-of-need and point-of-care applications. This book chapter will discuss smart materials and approaches used in colorimetric measurement-based biosensor methods for biomedical, diagnostic, food safety, and environmental pollution applications.

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One-drop micro-array towards accelerated optical quantification of dopamine in human biofluids using triangular silver nanoparticles: Smartphone-assisted biomedical analysis by colorimetric sensing and Lab-on-paper technology

Cited by 3 publications

References 28 publications

Identification of taurine biomarker in human biofluids using plasmonic patterns of silver nanostructure

Identification of taurine biomarker in human biofluids using plasmonic patterns of silver nanostructure

Effect of Storage Conditions on the Stability of Colloidal Silver Solutions Prepared by Biological and Chemical Methods

Advanced Colorimetric Sensors: Cutting-Edge Materials and Smart Approaches

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