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A Clickable and Photocleavable Lipid Analogue for Cell Membrane Delivery and Release

15-May-2015 | Shahrina Alam; Daiane S. Alves; Stuart A. Whitehead; Andrew M. Bayer; Christopher D. McNitt; Vladimir V. Popik; Fran ..., Bioconjugate Chemistry, 2015

For drug delivery purposes, the ability to conveniently attach a targeting moiety that will deliver drugs to cells and then enable controlled release of the active molecule after localization is desirable. Toward this end, we designed and synthesized clickable and photocleavable lipid analogue 1 ...

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The Fluorescence and Infrared Absorption Probe para‐Cyanophenylalanine: Effect of Labeling on the Behavior of Different Membrane‐Interacting Peptides

13-May-2015 | Sara Bobone, Marta De Zotti, Annalisa Bortolotti, Barbara Biondi, Gema Ballano, Antonio Palleschi, Claudio Toniolo, ..., Peptide Science, 2015

ABSTRACT Total syntheses and complete characterizations of singly substituted PheCN‐based analogs of alamethicin AlaP, which is active on model and natural membranes, and the TM peptide, which inserts in a trans‐membrane orientation in lipid bilayers, are reported. The syntheses of the AlaP ...

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Inhibition of the Aggregation of Lactoferrin and (−)-Epigallocatechin Gallate in the Presence of Polyphenols, Oligosaccharides, and Collagen Peptide

13-May-2015 | Wei Yang; Fuguo Liu; Chenqi Xu; Cuixia Sun; Fang Yuan; Yanxiang Gao, Journal of Agricultural and Food Chemistry, 2015

The aggregation of lactoferrin and (−)-epigallocatechin gallate (EGCG) was inhibited by polyphenols, oligosaccharides, and collagen peptide in this study. Polyphenols, oligosaccharides, or collagen peptide can effectively prevent the formation of lactoferrin–EGCG aggregates, respectively. The ...

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Highly Fluorescent Flavins: Rational Molecular Design for Quenching Protection Based on Repulsive and Attractive Control of Molecular Alignment

11-May-2015 | Haruka Suzuki, Ryo Inoue, Soichiro Kawamorita, Naruyoshi Komiya, Yasushi Imada, Takeshi Naota, Chemistry - A European Journal, 2015

Abstract Unprecedented intense fluorescent emission was observed for a variety of flavin compounds bearing a perpendicular cyclic imide moiety at the C7 position of an isoalloxazine platform. A series of alloxan‐substituted flavins was prepared selectively by reduction of the corresponding ...

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Synthesis, Photochemical Properties, and Cytotoxicities of 2H-Naphtho[1,2-b]pyran and Its Photodimers

11-May-2015 | Motohiro Ota; Takahiro Sasamori; Norihiro Tokitoh; Takefumi Onodera; Yoshiyuki Mizushina; Kouji Kuramochi; Kazunori ..., The Journal of Organic Chemistry, 2015

A 2H-naphtho[1,2-b]pyran, prepared by dimerization of 2-bromo-3-methyl-1,4-naphthoquinone and O-methylation, readily undergoes solid-state [2 + 2] photodimerization to give a photodimer in excellent yield and with excellent selectivity. Retro [2 + 2] cycloaddition can be achieved by irradiation ...

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Fluorescence Resonance Energy Transfer-Based Ratiometric Fluorescent Probe for Detection of Zn2+ Using a Dual-Emission Silica-Coated Quantum Dots Mixture

08-May-2015 | Liang Wu; Qing-Sheng Guo; Yu-Qian Liu; Qing-Jiang Sun, Analytical Chemistry, 2015

In this work, we report the design and application of a new ratiometric fluorescent probe, which contains different-colored quantum dots (QDs) as dual fluorophores, ultrathin silica shell as spacer, and meso-tetra(4-sulfonatophenyl)porphine dihydrochloride (TSPP) as receptor, for Zn2+ detection ...

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ESIPT-based fluorescent probe for sensitive detection of hydrazine in aqueous solution and waste water mimics

07-May-2015 | Ji Zhou; Ruiyan Shi; Jianxu Liu; Rui Wang; Yufang Xu; Xuhong Qian, Organic & Biomolecular Chemistry, 2015

A fluorescent probe for sensitive detection of hydrazine based on an ESIPT mechanism and a substitution–cyclization–elimination cascade was developed. After the addition of hydrazine, an approximately 50-fold enhancement in fluorescence intensity at 465 nm was observed and the subsequent decrease ...

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Controlled self-assembly of a pyrene-based bolaamphiphile by acetate ions: from nanodisks to nanofibers by fluorescence enhancement

07-May-2015 | Shouchun Yin; Lin Dong; Yijun Xia; Bin Dong; Xingxing He; Dong Chen; Huayu Qiu; Bo Song, Soft Matter, 2015

In this paper, a pyrene moiety is incorporated into a bolaamphiphile to form a novel molecule denoted PRB. Above the critical micelle concentration, PRB forms nanodisks in the aqueous solution. The addition of acetate ions induces a morphological change in self-assembled aggregates, which convert ...

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Ultrasensitive Near-Infrared Fluorescence-Enhanced Probe for in Vivo Nitroreductase Imaging

07-May-2015 | Yuhao Li; Yun Sun; Jiachang Li; Qianqian Su; Wei Yuan; Yu Dai; Chunmiao Han; Qiuhong Wang; Wei Feng; Fuyou Li, Journal of the American Chemical Society, 2015

Nitroreductase (NTR) can be overexpressed in hypoxic tumors, thus the selective and efficient detection of NTR is of great importance. To date, although a few optical methods have been reported for the detection of NTR in solution, an effective optical probe for NTR monitoring in vivo is still ...

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Simple and Effective Label-Free Capillary Electrophoretic Analysis of Sugars by Complexation Using Quinoline Boronic Acids

06-May-2015 | Takuya Kubo; Koichi Kanemori; Risa Kusumoto; Takayuki Kawai; Kenji Sueyoshi; Toyohiro Naito; Koji Otsuka, Analytical Chemistry, 2015

An effective separation and detection procedure for sugars by capillary electrophoresis (CE) using a complexation between quinolineboronic acid (QBA) and multiple hydroxyl structure of sugar alcohol is reported. We investigated the variation of fluorescence spectra of a variety of QBAs with ...

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