Calcium Ions Turn on the Fluorescence of Oxytetracycline for Sensitive and Selective Detection

Highly Reversible “Off‐On‐Off” Dual‐channel Fluorescence Probe Based on Amino Pyrazole and Phenothiazine for Sensing Extremely Alkaline Solution

“…PTZ-aminopyrazole was synthesized easily with a considerable yield (68 %). The structures of PTZ-CHO and PTZ-aminopyrazole probe were further characterized by HR-MS, 1 H NMR, 13 C NMR (Figures S1-S6). The photostability of PTZaminopyrazole solution was studied by flashing UV light at 365 nm.…”

“…In view of the fact that PTZ-aminopyrazole contains four N atoms in its structure, which may bind various metal ions and anions, we evaluated the selectivity of the probe. [13] The fluorescent signals at pH 2.6, 7.4 and 13.6 in response to a series of environmentally common metal ions (Al 3 + , Ca 2 + , Mg 2 + , Cd 2 + , Cu 2 + , K + , Na + , Mn 2 + , Ni 2 + and Zn 2 + , 10 mM for each) and anions (PO 4 3À , Br À , NO 2 À , HSO 3 À , HCO 3 À , NO 3 À , SO 3 2À , HPO 4 2À , HSO 4 À , Ac À , F À , Cl À , S 2 O 3 2À , SO 4 2À , 10 mM for each) were shown in the Figure 6. The results showed that all the above species have no obvious interference on the fluorescence and absorbance of PTZ-aminopyrazole, indicating that PTZ-aminopyrazole has good selectivity and more potential than biomolecules and ions to monitor the pH value in biological environments.…”

“…In the past few years, as a focus in the field of sensing analytes, many pH sensors have been developed in the fields of environment, biomedicine and industry, which have the advantages of high chemical selectivity, biocompatibility and high sensitivity. [10][11][12][13] Up to now, there have been many researches in this field, and various fluorescent probes have been developed for detecting intracellular pH and environmental water samples. [14][15][16] Signore et al designed a fluorescent pH biosensor based on a conjugated coumarin-triazine scaffold.…”

“…The synthetic route of amino pyrazole and phenothiazine probe (PTZ-aminopyrazole) was depicted in Scheme 1. The chemical structure of compound PTZ-aminopyrazole was characterized by 1 H NMR, 13 C NMR and MS (Supporting Information). PTZ-aminopyrazole shows two channels in pH detection, and has color changes under UV light and visible light respectively.…”

Characterization of medieval-like glass alteration layers by laser spectroscopy and nonlinear optical microscopy

“…In the region around 300-450 nm, a band with a shoulder at short wavelengths (330-360 nm) can be assigned, according to previous works [37,[53][54][55], to oxygen deficiency centres (ODC) from the glass network. The additional contribution centred in the region around 520 nm is attributed to the Ca 2+ ion [56][57][58] present both in the glass lattice and in the burial media. The relative intensity of this feature is observed to increase with the calcium oxide content in the outer surface of each analysed sample, as revealed by LIBS and SEM-EDS.…”