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Fabrication of folate bioconjugated near-infrared fluorescent silver nanoclusters for targeted in vitro and in vivo bioimaging

28-10-2014 | Yong Wang; Cong Dai; Xiu-Ping Yan, Chemical Communication, 2014

Thiolpolyethyleneimine stabilized silver nanoclusters (SH-PEI-AgNCs) with intense NIR fluorescence and chemical stability were fabricated in aqueous solution. The SH-PEI-AgNCs were subsequently bioconjugated with folate for targeted in vitro and in vivo bioimaging.

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Supramolecular interaction of labetalol with cucurbit[7]uril for its sensitive fluorescence detection

28-10-2014 | Huangxian Ju; Chang-Feng Li; Jianxia Feng, Analyst, 2014

This work studied the host-guest interaction between cucurbit[7]uril (CB[7]) and labetalol in acidic aqueous solution and proposed a simple competitive method for fluorescence detection of labetalol. The binding constant of labetalol-CB[7] was (1.83±0.22)×106 M−1, which was much greater than ...

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An FITC‐BODIPY FRET Couple: Application to Selective, Ratiometric Detection and Bioimaging of Cysteine

24-10-2014 | Dong Hee Ma, Dokyoung Kim, Takuya Akisawa, Kyung‐Ha Lee, Kyong‐Tai Kim, Kyo Han Ahn, Chemistry - An Asian Journal, 2014

Abstract A novel FRET couple of fluorescein is disclosed, and it was readily constructed by conjugating an amino‐BODIPY dye, a new FRET donor, with fluorescein isocyanate. Its potential was demonstrated by a fluorescence sensing system for cysteine, which was prepared by introducing acryloyl ...

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N‐Heterocyclic Carbene Formation Induced Fluorescent and Colorimetric Sensing of Fluoride Using Perimidinium Derivatives

24-10-2014 | Dawei Zhang, Haiqiang Yang, Alexandre Martinez, Kelsey Jamieson, Jean‐Pierre Dutasta, Guohua Gao, Chemistry - A European Journal, 2014

Abstract In this study, two perimidinium derivatives (1 and 2) were designed, synthesized, and developed as efficient fluorescent and colorimetric chemodosisensors for F− in DMSO or more competitive media (DMSO containing 10 % water). In the presence of F−, the yellow and non‐fluorescent ...

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Helical Polycarbodiimide Cloaking of Carbon Nanotubes Enables Inter-Nanotube Exciton Energy Transfer Modulation

24-10-2014 | Januka Budhathoki-Uprety; Prakrit V. Jena; Daniel Roxbury; Daniel A. Heller, Journal of the American Chemical Society, 2014

The use of single-walled carbon nanotubes (SWCNTs) as near-infrared optical probes and sensors require the ability to simultaneously modulate nanotube fluorescence and functionally derivatize the nanotube surface using noncovalent methods. We synthesized a small library of polycarbodiimides to ...

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Fluorescent sensors based on quinoline‐containing styrylcyanine: determination of ferric ions, hydrogen peroxide, and glucose, pH‐sensitive properties and bioimaging

23-10-2014 | Xiaodong Yang, Peiliang Zhao, Jinqing Qu, Ruiyuan Liu, Luminescence, 2014

ABSTRACT A novel styrylcyanine‐based fluorescent probe 1 was designed and synthesized via facile methods. Ferric ions quenched the fluorescence of probe 1, whereas the addition of ferrous ions led to only small changes in the fluorescence signal. When hydrogen peroxide was introduced into the ...

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Time- and Concentration-Dependent Reactivity of Cys, Hcy, and GSH on the Diels–Alder-Grafted 1,3,5-Tris Conjugate of Calix[6]arene To Bring Selectivity for Cys: Spectroscopy, Microscopy, and Its Reactivity in Cells

22-10-2014 | V. V. Sreenivasu Mummidivarapu; Deepthi S. Yarramala; Karuna Kumar Kondaveeti; Chebrolu P. Rao, The Journal of Organic Chemistry, 2014

Herein we report the synthesis and characterization of 7-oxanorbornadiene (OND)-appended 1,3,5-tris conjugate of calix[6]arene (L2). L2 has been shown to exhibit selective reactivity toward cysteine (Cys) over homocysteine (Hcy) and glutathione (GSH) under stoichiometric conditions. The ...

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Interactions between a Series of Pyrene End-Labeled Poly(ethylene oxide)s and Sodium Dodecyl Sulfate in Aqueous Solution Probed by Fluorescence

21-10-2014 | Shaohua Chen; Jean Duhamel; Baoliang Peng; Masuduz Zaman; Kam C. Tam, Langmuir, 2014

The interactions between a series of poly(ethylene oxide)s covalently labeled at both ends with pyrene pendants (PEO(X)-Py2, where X represents the number-average molecular weight of the PEO chains and equals 2K, 5K, 10K, and 16.5K) and an ionic surfactant, namely, sodium dodecyl sulfate (SDS), ...

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Assessing the Blinking State of Fluorescent Quantum Dots in Free Solution by Combining Fluorescence Correlation Spectroscopy with Ensemble Spectroscopic Methods

20-10-2014 | Chaoqing Dong; Heng Liu; Jicun Ren, Langmuir, 2014

The current method for investigating the blinking behavior is to immobilize quantum dots (QDs) in the matrix and then apply a fluorescent technique to monitor the fluorescent trajectories of individual QDs. So far, no method can be used to directly assess the blinking state of ensemble QDs in ...

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Phosphorescent Polymeric Nanoparticles by Coordination Cross‐Linking as a Platform for Luminescence Imaging and Photodynamic Therapy

16-10-2014 | Yang Lu, Fengfeng Xue, Zhiguo Zhou, Min Shi, Yuping Yan, Lijie Qin, Hong Yang, Shiping Yang, Chemistry - A European Journal, 2014

Abstract Water‐soluble phosphorescent polymeric nanoparticles with an average diameter of approximately 100 nm were synthesized by a coordination cross‐linking reaction. The pyridine blocks in poly(4‐vinyl pyridine‐b‐ethylene oxide) (P4VP‐b‐PEO) were cross‐linked by the iridium ...

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