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Luminescent ruthenium(II) complex covalently bound silica nanoparticles have been prepared and used as a probe for time-gated luminescence bioimaging. The new nanoparticles were prepared by copolymerization of a luminescent Ru(II) complex tris(5-amino-1,10-phenanthroline)ruthenium(II) conjugated with 3-aminopropyl(triethoxy)silane (APS-Ru conjugate), free (3-aminopropyl)triethoxysilane (APS) and tetraethyl...
A rhodamine 6G hydrazide fluorescent chemosensor was prepared for the rapid HOCl detection in aqueous media. The system makes good use of the irreversible HOCl-mediated selective oxidation reaction to generate fluorescent response proportional to the amount of HOCl in neutral buffer. This probe exhibits great photostability, high sensitivity, and good selectivity for HOCl over other reactive species...
Herein, a novel kind of silver nanocluster is synthesized simply by mixing G-quadruplex template with silver ions and reduction reagent (NaBH 4 , here). AS1411 (a G-quadruplex that can bind nucleolin overexpressed in cancer cells) is used as the main model template to prove the synthesis protocol and its potential application. We used fluorescence assay, CD, MALDI TOF MS, and TEM to characterize...
Herein, folic acid (FA) conjugated with AuNPs were introduced into the cancer cell imaging via the specific interaction between FA and the folate receptor on the cell surface. FA protected gold nanoparticles (AuNPs) was synthesized and labeled with fluorescein isothiocynate (FITC) to form the FITC–FA–AuNPs (FFANPs). As over-expressed folic acid receptor in some cancer cells and folic acid can specifically...
A calibration step in an analytical procedure is often not adequately treated, although it is a very important step in the analysis. Also, the approach to the nomenclature seems to be disrespectful. In order to resolve this problem we chose a new classification based on both how the calibration dependence is reconstructed, and how the measurement data is then transformed. In this paper we discussed...
A ruthenium(II) complex, [Ru(bpy) 2 (DA-phen)](PF 6 ) 2 (bpy: 2,2'-bipyridine; DA-phen: 5,6-diamino-1,10-phenanthroline), has been developed as a photoluminescent (PL) and electrochemiluminescent (ECL) dual-signaling probe for the highly sensitive and selective detection of nitric oxide (NO) in aqueous and biological samples. Due to the presence of electron transfer process...
Recovery of fully aggregated water-soluble CdTe quantum dots was achieved by simple treatment with a strong base. A deprotonation-triggered disaggregation is postulated to be the main mechanism involved in the quantum dots “reborn” process.
The presence of the carbon dots (C-dots) in food is a hotly debated topic and our knowledge about the presence and the use of carbon dots (C-dots) in food is still in its infancy. We report the finding of the presence of photoluminescent (PL) C-dots in commercial Nescafe instant coffee. TEM analysis reveals that the extracted C-dots have an average size of 4.4nm. They were well-dispersed in water...
We reported a two-photon ratiometric fluorescent probe for detecting intracellular pH. When excited with 800nm laser, an optimal output of laser as the routine equipment of two-photon fluorescence microscopy, the two-photon excited fluorescence of this probe showed distinct emission peak shift as large as 109nm upon the change of pH values in vitro. Very importantly, the experiment results show that...
In this work, high quantum yield and strong photoluminescent carbon quantum dots (C-QDs) are successfully synthesized via a facile and green hydrothermal method using citric acid and Tris as precursors. The as-synthesized C-QDs with a quantum yield (QY) as high as 52% were characterized by UV, FT-IR, TEM, XPS and fluorescence spectroscope. TEM results show that C-QDs are mono-dispersed spherical particles...
A new turn-on fluorescent probe, incorporating 7-nitrobenzoxadiazole (NBD) ether group into a BODIPY molecule, was synthesized and studied for the detection of H2S and biothiols in aqueous solution and in living cells. The design was based on thiol-induced thiolysis of the NBD ether bond and followed by the cleavage and the release of free meso-(4-hydroxybenzyl)-substituted BODIPY fluorophore. The...
A new type of flavone-based fluorescent probe (DMAF) capable of cysteine (Cys)/homocysteine (Hcy) sensing with high selectivity over other amino acids was developed. Such type of probe undergoes Cys/Hcy-mediated cyclization reaction with the involvement of its aldehyde group, which suppresses of the photoinduced electron transfer (PET) process of the probe molecule and consequently leads to the enhancement...
Based on the reversible redox reaction of 4-amino-2,2,6,6-tetramethyl-piperidin-1-ol with oxidative ClO− and reductive ascorbic acid (AA), a reversible fluorescent probe, incorporating 4-amino-2,2,6,6-tetramethyl-piperidin-1-ol group into a 7-nitrobenzoxadiazole (NBD) fluorophore, was synthesized and studied for the cyclic detection of ClO−/AA in aqueous solution. The NBD-based probe displayed sensitive...
We report a simple one-step hydrothermal method for the synthesis of hydrophilic luminescent upconversion nanoparticles (UCNPs) using malonic acid as the stabilizer and functional agent. Using this method, two UCNPs with different colors of upconversion luminescence were synthesized. The surface of the as-prepared UCNPs was capped with carboxyl groups, which not only resulted in the UCNPs having good...
Recently, carbon nanomaterials have received considerable attention as fluorescent probes owing to their low toxicity, water solubility and stable photochemical properties. However, the development of graphene quantum dots (GQDs) is still on its early stage. In this work, GQDs were successfully synthesized by one-step microwave assisted pyrolysis of aspartic acid (Asp) and NH4HCO3 mixture. The as-prepared...
A turn-on fluorescent probe (Naphsulf-O) for hydrazine was developed by protecting the hydroxy group of the fluorophore 6-acetyl-2-hydroxynaphthalene via O-4-nitrobenzenesulfonylation, where 4-nitrobenzene was used as a fluorescence quenching moiety as well as an electrophile. Upon nucleophilic aromatic substitution (NAS) reaction of hydrazine toward the probe, the protecting group was removed and...
A new fluorescent probe 7-(diethylamino)-3-((1e,3e)-5-oxo-5-phenylpenta-1,3-dien-1-yl)-2H-chromen-2-one (SPH), based on Michael addition mechanism, was designed and synthesized for selective detection of sulfite. The probe was constructed by incorporating an α,β-unsaturated ketone conjugated with a C˭C bond into the coumarin fluorophore as a specifical reaction site for sulfite utilizing its nucleophilic...
Hydrogen persulfide (H2S2), as a direct redox form of H2S, may have its own physiological processes in maintaining intracellular redox homeostasis. The research on hydrogen persulfide was rapidly growing. As it is the actual signalling molecules derived from hydrogen sulfide, reversible detection of hydrogen persulfide changes in cells is of great significance. To address this critical need, we present...
The uptake and accumulation of Cd in sunflower seeds represents an important pathway for imputing potentially toxic metals into human and animal food. In this way, bioimaging of Cd and micronutrients (Cu, Fe and Mn) in the seeds of sunflower grown in soil contaminated with Cd are performed. For this task, laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) is used in quantitative...
A new ratiometric fluorescent probe based on a hemicyanine dye was synthesized. Investigation on the response behavior towards amino acids showed that the probe had a capability of rapidly and selectively detecting cysteine over other biothiols such as glutathione and homocysteine with similar structure and reactivity, and it also displayed a high selectivity and rapid response. Moreover, the probe...
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