New type mesoporous conjugate material for selective optical copper(II) ions monitoring & removal from polluted waters

Colorimetric metal ion sensors – A comprehensive review of the years 2011–2016

Treatment of copper(II) containing wastewater by a newly developed ligand based facial conjugate materials

Exposure to mercury ions can damage the human brain, the nervous system, the endocrine system, and other biological systems. Much effort has therefore been made to develop real-time monitoring of mercury variations, and many mercury-ion sensors have been reported recently. In this review, mercury-ion sensors reported since 2008 are described and discussed. The sensors are classified as molecular, nanomaterial based, and others. Molecular sensors are based on chemical and hydrogen bond formation, and the other types are based on changes in the materials used.

Fluorescent and colorimetric sensors for environmental mercury detection

Novel composite material for selective copper(II) detection and removal from aqueous media

Purpose The current study provides national cancer statistics and their secular trends in Korea, including incidence, mortality, survival, and prevalence in 2018. Materials and methods Incidence, survival, and prevalence rates of cancer were calculated using the Korea National Cancer Incidence Database, from 1999 to 2018, with survival follow-up until December 31, 2019. Deaths from cancer were assessed using causes-of-death data obtained from Statistics Korea. Crude and age-standardized rates (ASRs) for incidence, mortality, prevalence, and 5-year relative survival rates were calculated, and temporal trends for incidence and mortality rates were evaluated, with annual percentage changes. Results In 2018, newly diagnosed cancer cases and deaths from cancer were reported as 243,837 (ASR, 270.4 per 100,000) and 79,153 (ASR, 73.3 per 100,000), respectively. The overall cancer incidence rates increased by 3.3% annually from 1999 to 2012, and decreased by 5.4% annually from 2012 to 2015, thereafter, followed by nonsignificant changes. Cancer mortality rates have been decreasing since 2002, with more rapid decline in recent years (annual decrease of 2.7% from 2007 to 2014; 3.7% from 2014 to 2018). The 5-year relative survival between 2014 and 2018 was 70.3%, which contributed to prevalent cases reaching over 2 million by the end of 2018. Conclusion Cancer statistics have improved significantly during the past two decades. However, there remain important challenges to be solved, such as controlling cancers with low survival rates. Cancer statistics can be used to discover blind spots in cancer control, and as evidence for developing and implementing future cancer control strategies.

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Cancer Statistics in Korea: Incidence, Mortality, Survival, and Prevalence in 2018.

A new highly selective colorimetric chemosensor 1 (E)-9-(((5-mercapto-1,3,4-thiadiazol-2-yl)imino)methyl)-2,3,6,7-tetrahydro-1H,5H-pyrido[3,2,1-ij]quinolin-8-ol was designed and synthesized for the sequential detection of Cu2+ and CN−. This sensor 1 exhibited an obvious color change from yellow to orange in the presence of Cu2+ in a fully aqueous solution. The detection limit (0.9 μM) of 1 for Cu2+ is far lower than the WHO limit (31.5 μM) for drinking water. In addition, the resulting Cu2+-2·1 complex can be further used to detect toxic cyanide through a color change from orange to yellow, indicating the recovery of 1 from Cu2+-2·1. Importantly, chemosensor 1 could be used to detect and quantify Cu2+ in water samples, and a colorimetric test strip of 1 for the detection of Cu2+ could be useful for all practical purposes.

A colorimetric sensor for the sequential detection of Cu(2+) and CN(-) in fully aqueous media: practical performance of Cu(2+).

A colorimetric chemosensor for the sequential detection of copper(II) and cysteine

A new and simple colorimetric receptor 1, based on 2,3-diaminomaleonitrile and julolidine moieties, has been synthesized and characterized. 1 showed a selective colorimetric sensing ability for copper(II) ions by changing color from yellow to colorless, and could be utilized to monitor Cu2+ over a wide pH range of 4–12. The detection limit of 1 (2.1 μM) for Cu2+ ions is much lower than that recommended by WHO in drinking water (30 μM). Moreover, the receptor 1 can also detect fluoride by color change from yellow to orange, distinguishing the fluoride ions effectively from anions such as CH3COO− and CN−. It was also found that the 1–F− complex was reversibly bound and could be simply reverted back through treatment with a proper reagent such as HCl. The sensing mechanism for F− was theoretically supported by DFT and TD-DFT calculations.

A diaminomaleonitrile based selective colorimetric chemosensor for copper(II) and fluoride ions

We designed and synthesized a new asymmetric chemosensor 1 based on the combination of salicylaldehyde moiety and 2-amino-3-(((E)-(8-hydroxy-2,3,6,7-tetrahydro-1H,5H-pyrido[3,2,1-ij]quinolin-9yl)methylene)amino)maleonitrile followed by the condensation reaction of julolidine and 2,3-diaminomaleonitrile. The sensor 1 exhibited definite color changes from violet to pale yellow for CN − and Cu 2+ separately in different solvent systems. The phenomena possibly originated from blue shift generated by the intramolecular charge transfer (ICT) transition. The complex formations were proposed to be in 1:1 ratio, based on Job plot, 1 H NMR titration and ESI-mass spectrometry analysis. Furthermore, the multifunctional colorimetric sensing ability of 1 was theoretically explained by DFT and TDDFT calculations.

Jae Jun Lee

Papers

Cancer Statistics in Korea: Incidence, Mortality, Survival, and Prevalence in 2018.

A colorimetric sensor for the sequential detection of Cu(2+) and CN(-) in fully aqueous media: practical performance of Cu(2+).

A colorimetric chemosensor for the sequential detection of copper(II) and cysteine

A diaminomaleonitrile based selective colorimetric chemosensor for copper(II) and fluoride ions

A multifunctional colorimetric chemosensor for cyanide and copper(II) ions