Colorimetric detection of copper ions using porphyrin-conjugated silica nanoparticles
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ORIGINAL ARTICLE
Colorimetric detection of copper ions using porphyrin‑conjugated silica nanoparticles Baljinder Singh1 · Jungmin Lee2 · Hyeon‑Gyu Kim3 · Myoung‑Hwan Park1,2,4 · Kibeom Kim2 Accepted: 12 November 2020 © Korean Society of Environmental Risk Assessment and Health Science 2020
Abstract Objective The importance of detection of C u2+ metal ions has increased due to its high toxicity and wide presence in the 2+ environment. The method of sensing Cu has continued to be the classic method using complex and expensive facilities. The objective of this study is to develop a simple and highly sensitive sensing method for Cu2+ detection. Methods In this study, we have developed a simple colorimetric method for sensing C u2+ metal ions using porphyrinconjugated silica nanoparticles (SiNPs-Por) with high sensitivity. Porphyrin was modified on silica nanoparticles through azide-alkyne huisgen cycloaddition (click reaction), which is high yielding and simple to perform. Results The porphyrin-based probes exhibited color change by coordination with C u2+ metal ions at room temperature. The sensing capability of porphyrin after interacting with different concentrations of Cu2+ in solution showed variations in absorptions using UV–Vis spectroscopy and colorimetric sensing in the hue, saturation, and value model using image recognition mobile application. Conclusions SiNPs-Por are highly responsive sensors for the detection of Cu2+. Keywords Colorimetric detection · Copper ions · Porphyrin · Silica nanoparticles · HSV model · 3-Dimensional visualizer
Introduction Heavy metal ions which are naturally present elements in the earth’s crust, environment, and diet might be highly toxic and harmful to both human and environment [1–3]. They are required in small amount to maintain good health, but they can become toxic for humans in large quantity and may result to deficiency diseases or syndromes [4]. In the human body, high concentration of heavy metal ions is transported into body cells and tissues, resulting in binding to proteins * Myoung‑Hwan Park [email protected] * Kibeom Kim [email protected] 1
Department of Convergence Science, Sahmyook University, Seoul 01795, South Korea
2
Convergence Research Center, Nanobiomaterials Institute, Sahmyook University, Seoul 01795, South Korea
3
Department of Computer Engineering, Sahmyook University, Seoul 01795, South Korea
4
Department of Chemistry and Life Science, Sahmyook University, Seoul 01795, South Korea
and nucleic acids, destroying these macromolecules, and disrupting their cellular functions [5, 6]. It can cause nausea, liver and kidney damage, anemia, vomiting, abdominal pain, and severe damage in brain, central nervous system or even lead to death [7, 8]. Domestic and international environmental regulations have been strengthened with increasing interest in climate change and environmental protection. Accordingly, research on sensors to identify and detect environmentally harmful substances that can seriously affect the environment has
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