A novel electrochemical platform based on indenoindole for selective detection of Cu2+ ions in Punica granatum fruit juice

Verbascoside extracted from Clerodendrum inerme: A natural monomer for the fabrication of a sensitive electrochemical Cu(II) sensor

“…13 C NMR (125 MHz, CD 3 OD): δ 168.3 (C-α’), 149.7 (C-4’’’), 148.0 (C-γ’), 146.8 (C-4), 146.1 (C-3’’’), 144.7 (C-3), 131.5 (C-1), 127.7 (C-1’’’), 123.2 (C-6’’’), 121.2 (C-6), 117.1 (C-2), 116.5 (C-5’’’), 116.3 (C-5), 115.2 (C-2’’’), 114.7 (C-β’), 104.2 (C-1’), 103.0 (C-1’’), 81.6 (C-3’), 76.2 (C-2’), 76.0 (C-5’), 73.8 (C-4’’), 72.3 (C-2’’), 72.2 (C-α), 72.0 (C-3’’), 70.6 (C-4’), 70.4 (C-5’’), 62.4 (C-6’), 36.5 (C-β), 18.4 (C-6’’).…”

“…It should be stressed that levels of Cu 2+ concentrations in drinking water below 2 mg L −1 correspond to the World Health Organization (WHO) guidelines. 11 –15 In fact, Cu 2+ ions can be detected and quantified by routine methods with the most common being flame atomic absorption spectrometry with a limit of detection (LoD) at level less than 10 nM. 16 –18 Other methods include the most sensitive, that is, mass spectrometry (coupled to inductively coupled plasma) with an LoD of 5 ng L −1,19,20 as well as optical 21 –24 and electrochemical 14,15,25 techniques.…”

N-doped molybdenum oxide quantum dots as fluorescent probes for the quantitative detection of copper ions in environmental samples

“…Various instrumental analytical techniques have been used to detect Cu 2+ , such as inductively coupled plasma-mass spectrometry, 9 thin-layer chromatography, 10 electrochemical methods, 11 colorimetry, 12 atomic absorption spectroscopy, and surface-enhanced Raman spectroscopy. 13 Although these traditional methods have shown significant promise for the detection of copper ions, they typically require expensive instrumentation, complex sample pretreatment steps, organic solvents, and highly skilled personnel.…”