Conjugated polymer nanoparticles based on carbazole for detecting ferric ion (III) with a large Stokes shift and high sensitivity and the application in cell imaging

Enhanced Two-Photon Fluorescence and Fluorescence Imaging of Novel Probe for Calcium Ion by Self-Assembly with Conjugated Polymer

“…The sharp bands at 528 nm are mainly the second harmonics of the beam source. Their amplitudes are enhanced with the increased concentrations of PCBMB, which have been reported in other studies [32,39]. Moreover, the fluorescent intensity increased dramatically with the addition of PCBMB before the ratio of polymer/probe = 1, and then levelled off.…”

“…The fluorescent intensity of BAPTAVP exhibits a good linear relationship (y = 1.43x + 46.7, R 2 = 0.991) with the concentrations of Ca 2+ in the range from 1 × 10 −7 to 1 × 10 −5 mol/L in Figure 1c. The limit of detection (LOD) of BAPTAVP for OP fluorescence was estimated to be 9.6 × 10 −8 mol/L, which was obtained by the equation LOD = 3S b /K [32] (S b represents the standard deviation and K is the slope between fluorescence intensity versus Ca 2+ concentration). This value is superior to that reported in the literature in the detection of endogenous Ca 2+ [33].…”

“…We can see that the carboxyl groups appear in the presence of acetylcholine esterase because of hydrolysis of ester bonds in BAPTAVP (Figure S2B). Furthermore, the carboxyl groups will disappear after the addition of Ca 2+ because of coordination with BAPTAVP, which enhances the fluorescence of BAPTAVP by attenuating the intramolecular charge transfer process [32]. Based on the above results, the possible interaction mechanism is described in Scheme 1.…”

Dual-Dynamic-Bond Cross-Linked Antibacterial Adhesive Hydrogel Sealants with On-Demand Removability for Post-Wound-Closure and Infected Wound Healing

“…All the groups exhibited continuous L929 cell proliferation in the following 2 days’ incubation, and the cell viability of the examined five samples was even higher than that of the TCP group after 3 days’ incubation, suggesting the excellent cytocompatibility of the prepared hydrogels. The slightly increased cell proliferation might be attributed to the synergistic effect of the important biological activities of the extracted Fe 3+ , including enzyme catalysis, cellular metabolism, and oxygen transport, and the antioxidant properties of PA. − Furthermore, the host inflammatory response is estimated through hematoxylin and eosin (H&E) staining (Figure F). As the dissolution of chitosan occurred with the intervention of acid or urea/alkali, QCS was chosen as the control group in the evaluation of the biocompatibility of samples in vivo to avoid the influence of additional materials on the biocompatibility evaluation.…”

Novel 2‐hydroxynaphthalene‐based fluorescent turn‐on sensor for highly sensitive and selective detection of Al3+ and its application in imaging in vitro and in vivo

“…The optimized geometries of bis-NAPPD and bis-NAPPD-Al 3+ complex are shown in Figure 11 All of these data indicate that this optimized structure could form intramolecular hydrogen bonds and generate an ESIPT process. [44][45][46] In the complex, the central Al 3+ ion is tetracoordinated with N1, N2, and the deprotonated O1 and O2 of the bis-NAPPD ligand. The bond distances of Al−O1, Al−O2, Al−N1, and Al−N2 are 1.757, 1.760, 1.978, and 1.945 Å, respectively.…”