In this study, we introduce time-resolved fluorescence detection with two-photon excitation at 532 nm for label-free analyte determination in microchip electrophoresis. In the developed method, information about analyte fluorescence lifetimes is collected by time-correlated single-photon counting, improving reliable peak assignment in electrophoretic separations. The determined limits of detection for serotonin, propranolol, and tryptophan were 51, 37, and 280 nM, respectively, using microfluidic chips made of fused silica. Applying two-photon excitation microchip separations and label-free detection could also be performed in borosilicate glass chips demonstrating the potential for label-free fluorescence detection in non-UV-transparent devices. Microchip electrophoresis with two-photon excited fluorescence detection was then applied for analyses of active compounds in plant extracts. Harmala alkaloids present in methanolic plant extracts from Peganum harmala could be separated within seconds and detected with on-the-fly determination of fluorescence lifetimes.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/ac4010937 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Fluorous-Phase- and Chiral-Axis-Enhanced Fluorescent Sensitivity and Chemoselectivity for Cysteine Recognition.
Org Lett
January 2025
Department of Chemistry, University of Virginia, Charlottesville, Virginia 22904, United States.
Highly fluorinated naphthyl aldehyde and binaphthyl aldehyde ()- were designed and synthesized for fluorous-phase-based sensing. Greatly enhanced sensitivity and chemoselectivity in going from to ()- in the fluorescent detection of cysteine has been discovered. This is attributed to the increased structural rigidity of the axially chiral binaphthyl unit in ()- upon reaction with cysteine to form the corresponding thiazolidine product.
View Article and Find Full Text PDFSynthesis, Characterization and Application of Iron (III) Complex of Schiff Base Ligand as a Novel Enhancement Fluorescent Sensor for Al Ion Detection.
J Fluoresc
January 2025
Department of Chemistry, College of Science, University of Sulaimani, Qlyasan Street, Sulaymaniyah, Kurdistan Regional Government, 46002, Iraq.
This study highlights the importance of developing sensitive and selective sensors for use in pharmaceutical applications for the first time. A novel iron(III)-complex, constructed from unsymmetrical tetradentate NNN'O type Schiff base ligand (E)-3-((6-aminopyridin-2-yl)imino)-1-phenyl butane-1-one (LH) and its structure of it characterized by using various spectroscopic techniques such as FT-IR, UV-Vis, elemental analysis, conductivity, magnetic susceptibility measurements and the TGA method. The correlation of all results revealed that the coordination of the (LH) with the metal ion in a molar ratio of 1:1 leads to the formation of an octahedral geometry around the metal ions.
View Article and Find Full Text PDFAdenoid cystic carcinomas (AdCC) of salivary gland origin have long been categorized as fusion-defined carcinomas owing to the almost universal presence of the gene fusion MYB::NFIB, or less commonly MYBL1::NFIB. Sinonasal AdCC is an aggressive salivary gland malignancy with no effective systemic therapy. Therefore, it is urgent to search for potentially targetable genetic alterations associated with AdCC.
View Article and Find Full Text PDFMercury(II)-Triggered Targeted and NIR-II Fluorescence/Photoacoustic Imaging Probe for High-Sensitivity Early Diagnosis and Evaluating Drug against Acute Liver and Kidney Injury.
Anal Chem
January 2025
State Key Laboratory of Applied Organic Chemistry and Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Gansu, Lanzhou 730000, China.
Mercury ions (Hg) have been found to disrupt the body's antioxidant defense mechanisms, leading to oxidative stress and physiological dysfunction. Early diagnosis and real-time monitoring of Hg fluctuations in organ damage are crucial but limited due to the lack of noninvasive and deep tissue imaging probes. Herein, a Hg-triggered targeted and NIR-II fluorescence/photoacoustic (PA) dual-mode molecular probe (NHG-2) was developed for real-time monitoring Hg fluctuations in Hg-induced acute liver and kidney injury mice.
View Article and Find Full Text PDFSingle-Cell Calcium Imaging for Studying the Activation of Calcium Ion Channels.
J Vis Exp
December 2024
School of Life Science, Beijing University of Chinese Medicine;
Single cell Ca imaging is essential for the study of Ca channels activated by various stimulations like temperature, voltage, native compound and chemicals et al. It primarily relies on microscopy imaging technology and the related Ca indicator Fura-2/AM (AM is the abbreviation for Acetoxymethyl ester). Inside the cells, Fura-2/AM is hydrolyzed by esterases into Fura-2, which can reversibly bind with free cytoplasmic Ca.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!