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https://www.readbyqxmd.com/read/29149729/functionalized-gold-nanoparticles-as-affinity-nanoprobes-for-multiple-lectins
#1
Karuppuchamy Selvaprakash, Yu-Chie Chen
Glycan-lectin interactions are commonly observed in nature. Analytical methods, which are used to detect lectins that rely on the use of glycan ligand-modified nanoprobes as affinity probes, have been developed. Most of the existing methods are focused on the use of synthetic glycan ligands. Nevertheless, naturally available glycoproteins, such as ovalbumin in chicken egg whites, are good sources for fabricating glycan-immobilized nanoprobes. In this study, we generated functionalized gold nanoparticles (Au NPs) from a one-pot reaction by reacting chicken egg white (cew) proteins with aqueous tetrachloroaurate...
November 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29149720/a-robust-strategy-for-preparation-of-sequential-stimuli-responsive-block-copolymer-prodrugs-via-thiolactone-chemistry-to-overcome-multiple-anticancer-drug-delivery-barriers
#2
Wendong Ke, Wei Yin, Zengshi Zha, Jean Felix Mukerabigwi, Weijian Chen, Yuheng Wang, Chuanxin He, Zhishen Ge
Block copolymer prodrugs (BCPs) have attracted considerable attentions in clinical translation of nanomedicine owing to their self-assembly into well-defined core-shell nanoparticles for improved pharmacokinetics, stability in blood circulation without drug leakage, and optimized biodistribution. However, a cascade of physiological barriers against specific delivery of drugs into tumor cells limit the final therapeutic efficacy. Herein, we report a robust and facile strategy based on thiolactone chemistry to fabricate well-defined BCPs with sequential tumor pH-promoted cellular internalization and intracellular stimuli-responsive drug release...
November 9, 2017: Biomaterials
https://www.readbyqxmd.com/read/29149704/gold-nanoparticles-as-an-adjuvant-influence-of-size-shape-and-technique-of-combination-with-cpg-on-antibody-production
#3
Lev A Dykman, Sergey A Staroverov, Alexander S Fomin, Vitaly A Khanadeev, Boris N Khlebtsov, Vladimir A Bogatyrev
Gold nanoparticles (GNPs) are advantageous as an adjuvant in the design of effective vaccines and in the preparation of high-affinity antibodies to haptens and complete antigens. Another method of activating immunocompetent cells with colloidal gold is to conjugate GNPs with CpG oligodeoxynucleotides (ODNs). We examined how the size and shape of GNPs and various combinations of GNPs and CpG ODNs 1826 affect the immune response. When animals were injected with a model antigen (BSA) coupled to gold nanospheres (diameters, 15 and 50nm), nanorods, nanoshells, and nanostars, the titers of the resultant antibodies differed substantially...
November 14, 2017: International Immunopharmacology
https://www.readbyqxmd.com/read/29149694/a-high-brightness-probe-of-polymer-nanoparticles-for-biological-imaging
#4
Sirong Zhou, Jiarong Zhu, Yaping Li, Liheng Feng
Conjugated polymer nanoparticles (CPNs) with high brightness in long wavelength region were prepared by the nano-precipitation method. Based on fluorescence resonance energy transfer (FRET) mechanism, the high brightness property of the CPNs was realized by four different emission polymers. Dynamic light scattering (DLS) and scanning electron microscopy (SEM) displayed that the CPNs possessed a spherical structure and an average diameter of ~75nm. Analysis assays showed that the CPNs had excellent biocompatibility, good photostability and low cytotoxicity...
November 11, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29149572/au-i-catalyzed-dimerization-of-two-alkyne-units-interplay-between-butadienyl-and-cyclopropenylmethyl-cation-model-studies-and-trapping-experiments
#5
Mathis Kreuzahler, Sven Fabig, Gebhard Haberhauer, Rolf Gleiter
In recent years, Au(I)-catalyzed reactions proved to be a valuable tool for the synthesis of substituted cycles by cycloaromatization and cycloisomerization starting from alkynes. Despite of the myriads of Au(I)-catalyzed reactions of alkynes, the mono Au(I)-catalyzed pendant to the radical dimerization of non-conjugated alkyne units has not been investigated by quantum chemical calculations. Herein by means of quantum chemical calculations, we describe the mono Au(I)-catalyzed dimerization of two alkyne units as well as the transannular ring closure reaction of a non-conjugated diyne...
November 17, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29149569/blue-thermally-activated-delayed-fluorescence-polymers-with-nonconjugated-backbone-and-through-space-charge-transfer-effect
#6
Shiyang Shao, Jun Hu, Xingdong Wang, Lixiang Wang, Xiabin Jing, Fosong Wang
We demonstrate a novel molecular design concept for thermally activated delayed fluorescence (TADF) polymers based on a nonconjugated polyethylene backbone with through-space charge transfer effect between pendant electron donor (D) and electron acceptor (A) units. Different from conventional conjugated D-A polymers with through-bond charge transfer effect, the nonconjugated architecture avoids the direct conjugation between D and A units, enabling us to realize blue emission. Meanwhile, the spatial π-π interaction between the physically separated D and A units results in both small singlet-triplet energy splitting (0...
November 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29149531/solution-adsorption-formation-of-a-%C3%AF-conjugated-polymer-graphene-composite-for-high-performance-field-effect-transistors
#7
Yun Liu, Wei Hao, Huiying Yao, Shuzhou Li, Yuchen Wu, Jia Zhu, Lei Jiang
Semiconducting polymers with π-conjugated electronic structures have potential application in the large-scale printable fabrication of high-performance electronic and optoelectronic devices. However, owing to their poor environmental stability and high-cost synthesis, polymer semiconductors possess limited device implementation. Here, an approach for constructing a π-conjugated polymer/graphene composite material to circumvent these limitations is provided, and then this material is patterned into 1D arrays...
November 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29149501/the-weakly-coordinating-tris-trichlorosilyl-silyl-anion
#8
Marian Olaru, Maxie F Hesse, Elena Rychagova, Sergey Ketkov, Stefan Mebs, Jens Beckmann
Closely following the procedure for the preparation of the base-stabilized dichlorosilylene complex NHCDipp∙SiCl2 by Roesky and Stalke et al. (Angew. Chem. Int. Ed. 2009, 48, 5683-5686), besides the reported by-product [NHCDipp-H+∙∙∙Cl-], few crystals of the salt [NHCDipp-H∙∙∙Cl∙∙∙H-NHCDipp]Si(SiCl3)3 were isolated and characterized by X-ray crystallography (NHCDipp = N,N-di(2,6-isopropylphenyl)-imidazo-2-ylidene). They feature the weakly-coordinating anion Si(SiCl3)3-, which was more rationally obtained in high yields upon deprotonation of conjugate Brønsted acid HSi(SiCl3)3 with NHCDipp or PMP (PMP = 1,2,2,6,6-pentamethylpiperidine)...
November 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29149179/postmenopausal-hormone-therapy-and-risk-of-stroke-a-pooled-analysis-of-data-from-population-based-cohort-studies
#9
Germán D Carrasquilla, Paolo Frumento, Anita Berglund, Christer Borgfeldt, Matteo Bottai, Chiara Chiavenna, Mats Eliasson, Gunnar Engström, Göran Hallmans, Jan-Håkan Jansson, Patrik K Magnusson, Peter M Nilsson, Nancy L Pedersen, Alicja Wolk, Karin Leander
BACKGROUND: Recent research indicates a favourable influence of postmenopausal hormone therapy (HT) if initiated early, but not late, on subclinical atherosclerosis. However, the clinical relevance of timing of HT initiation for hard end points such as stroke remains to be determined. Further, no previous research has considered the timing of initiation of HT in relation to haemorrhagic stroke risk. The importance of the route of administration, type, active ingredient, and duration of HT for stroke risk is also unclear...
November 2017: PLoS Medicine
https://www.readbyqxmd.com/read/29148816/assessment-of-anti-piperacillin-igg-binding-to-structurally-related-drug-protein-adducts
#10
Mohammed Amali, Rosalind Jenkins, Xioali Meng, Lee Faulkner, Paul Whitaker, Daniel Peckham, B Kevin Park, Dean John Naisbitt
The risk of developing hypersensitivity to alternative antibiotics is a concern for penicillin hypersensitive patients and healthcare pro-viders. Herein we use piperacillin hypersensitivity as a model to explore the reactivity of drug-specific IgG against alternative β-lactam protein adducts. Mass spectrometry was used to show the drugs (amoxicillin, flucloxacillin, benzyl penicillin, aztreonam and pipera-cillin) bind to similar lysine residues on the protein carrier bovine serum albumin. However, the hapten-specific IgG antibodies found in piperacillin hypersensitive patient plasma did not bind to other β-lactam protein conjugates...
November 17, 2017: Chemical Research in Toxicology
https://www.readbyqxmd.com/read/29148806/discovery-of-tropifexor-ljn452-a-highly-potent-non-bile-acid-fxr-agonist-for-the-treatment-of-cholestatic-liver-diseases-and-nonalcoholic-steatohepatitis-nash
#11
David C Tully, Paul V Rucker, Donatella Chianelli, Jennifer Williams, Agnes Vidal, Phil B Alper, Daniel Mutnick, Badry Bursulaya, James Schmeits, Xiangdong Wu, Dingjiu Bao, Jocelyn Zoll, Young Kim, Todd Groessl, Peter McNamara, H Martin Seidel, Valentina Molteni, Bo Liu, Andrew Phimister, Sean B Joseph, Bryan Laffitte
The farnesoid X receptor (FXR) is a nuclear receptor that acts as a master regulator of bile acid metabolism and signaling. Activation of FXR inhibits bile acid synthesis and increases bile acid conjugation, transport, and excretion, thereby protecting the liver from the harmful effects of bile accumulation, leading to considerable interest in FXR as a therapeutic target for the treatment of cholestasis and non-alcoholic steatohepatitis. We identified a novel series of highly potent non-bile acid FXR agonists that introduce a bicyclic nortropine-substituted benzothiazole carboxylic acid moiety onto a trisubstituted isoxazole scaffold...
November 16, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29148804/a-nanobionic-light-emitting-plant
#12
Seon-Yeong Kwak, Juan Pablo Giraldo, Min Hao Wong, Volodymyr Koman, Tedrick Lew, Jon Ell, Mark Weidman, Rosalie Sinclair, Markita P Landry, William A Tisdale, Michael S Strano
The engineering of living plants for visible light emission and sustainable illumination is compelling because plants possess independent energy generation and storage mechanisms and autonomous self-repair. Herein, we demonstrate a plant nanobionic approach that enables exceptional luminosity and lifetime utilizing four chemically-interacting nanoparticles, including firefly luciferase conjugated silica (SNP-Luc), D-luciferin releasing poly(lactic-co-glycolic acid) (PLGA-LH2), coenzyme A functionalized chitosan (CS-CoA) and semiconductor nanocrystal phosphors for longer wavelength modulation...
November 17, 2017: Nano Letters
https://www.readbyqxmd.com/read/29148735/stereoselective-stabilization-of-polymeric-vitamin-e-conjugate-micelles
#13
Min Gao, Jian Deng, Huiying Chu, Yu Tang, Zheng Wang, Yanjun Zhao, Guohui Li
Vitamin E (α-tocopherol) (TPGS) micelle is a robust nanocarrier in delivering hydrophobic active pharmaceutical ingredients, but is suffering from poor stability that is essential in terms of pharmaceutical and biomedical applications. Taking advantage of the chirality of vitamin E, this work reports the stereoselective stabilization of polymer-vitamin E conjugate micelles. Vitamin E was covalently linked to multivalent methoxy poly(ethylene glycol)-co-poly(glutamic acid), generating amphiphilic conjugates that could self-assemble into micelles...
November 17, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/29148732/photocontrolled-release-of-doxorubicin-conjugated-through-a-thioacetal-photocage-in-folate-targeted-nanodelivery-systems
#14
Pamela T Wong, Shengzhuang Tang, Jayme Cannon, Dexin Chen, Rachel Sun, Jennifer Lee, James Phan, Ke Tao, Kang Sun, Biqiong Chen, James R Baker, Seok Ki Choi
Despite their proven ability for precise and targeted release, nanoplatform systems for photocontrolled delivery often face formidable synthetic challenges, in part, due to the paucity of advanced linker strategies. Here we report on a novel linker strategy using a thioacetal ortho-nitrobenzaldehyde (TNB) cage, demonstrating its application for delivery of doxorubicin (Dox) in two nanoscale systems. This photocleavable linker, TNB(OH), which presents two identical arms, each terminated with a hydroxyl functionality, was prepared in a single step from 6-nitroverataldehyde...
November 17, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/29148731/conjugation-of-transforming-growth-factor-beta-to-antigen-loaded-poly-lactide-co-glycolide-nanoparticles-enhances-efficiency-of-antigen-specific-tolerance
#15
Liam M Casey, Ryan M Pearson, Kevin Hughes, Jeffrey Liu, Justin Rose, Madeleine G North, Leon Wang, Lei Mei, Stephen D Miller, Lonnie D Shea
Current strategies for treating autoimmunity involve the administration of broad-acting immunosuppressive agents that impair healthy immunity. Intravenous (i.v.) administration of poly(lactide-co-glycolide) nanoparticles (NPs) containing disease-relevant antigens (Ag-NPs) have demonstrated antigen(Ag)-specific immune tolerance in models of autoimmunity. However, subcutaneous (s.c.) delivery of Ag-NPs has not been effective. This investigation tested the hypothesis that co-delivery of the immunomodulatory cytokine, transforming growth factor beta 1 (TGF-β), on Ag-NPs would modulate the immune response to Ag-NPs and improve the efficiency of tolerance induction...
November 17, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/29148722/acoustic-wave-driven-functionalized-particles-for-aptamer-based-target-biomolecule-separation
#16
Raheel Ahmad, Ghulam Destgeer, Muhammad Afzal, Jinsoo Park, Husnain Ahmed, Jin Ho Jung, Kwangseok Park, Tae-Sung Yoon, Hyung Jin Sung
We developed a hybrid microfluidic device that utilized acoustic waves to drive functionalized microparticles inside a continuous flow microchannel and to separate particle-conjugated target proteins from a complex fluid. The acoustofluidic device comprised of an interdigitated transducer (IDT) that produced high-frequency surface acoustic waves (SAW) in a polydimethylsiloxane (PDMS) microfluidic channel. The SAW interacted with the sample fluid flow inside the microchannel and deflected particles from their original streamlines to achieve separation...
November 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29148721/ratiometric-fluorescence-sensing-and-real-time-detection-of-wa-ter-in-organic-solvents-with-one-pot-synthesis-of-ru-mil-101-al-nh2
#17
Hua-Qing Yin, Jichun Yang, Xue-Bo Yin
Ratiometric fluorescence detection attracts much attention because of its decreased environment influence and easy-to-differentiate color and intensity change. Herein, a guest-encapsulation metal organic framework (MOF), Ru@MIL-NH2, is prepared with 2-aminoterephthalic acid, AlCl3, and Ru(bpy)32+ by simple one-pot method for ratiometric fluorescence sensing of water in organic solvents. The rational selection of excitation wavelength provides dual emission at 465 and 615 nm from Ru@MIL-NH2 under single excitation of 300 nm...
November 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29148719/effect-of-antigen-retrieval-methods-on-non-specific-binding-of-anti-body-metal-nanoparticle-conjugates-on-ffpe-tissue
#18
Yuying Zhang, Xinping Wang, Sven Perner, Ágnes Bánkfalvi, Sebastian Schlücker
Immunohistochemical analysis of FFPE tissues provides important diagnostic and prognostic information in pathology. Metal nanoparticles (NPs) and in particular surface-enhanced Raman scattering (SERS) nanotags as a new class of labelling reagents are promising to be used for multiplexed protein profiling on tissue sections. However, non-specific binding of NPs onto the tissue specimens greatly hampers their clinical applications. In this study, we found that the antigen retrieval method strongly influences the extent of non-specific binding of the antibody-SERS NP conjugates to the tissue...
November 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29148709/nir-emitting-nanoprobes-based-on-cyclic-rgd-motif-conjugated-pbs-quantum-dots-for-integrin-targeted-optical-bioimaging
#19
Nicoletta Depalo, Michela Corricelli, Ivan de Paola, Gianpiero Valente, Rosa M Iacobazzi, Emiliano Altamura, Doriana Debellis, Daniela Comegna, Elisabetta Fanizza, Nunzio Denora, Valentino Laquintana, Fabio Mavelli, Marinella Striccoli, Michele Saviano, Angela Agostiano, Annarita Del Gatto, Laura Zaccaro, Maria Lucia Curri
Here, silica coated PbS quantum dots (QDs) with photoluminesce emission properties in the near-infrared (NIR) region are proposed as potential effective single particle optical nanoprobes for future in vivo imaging of tumors. The dispersibility in aqueous medium of hydrophobic PbS QDs was accomplished by growing a silica shell on their surface by exploiting a base assisted water-in-oil microemulsion method. The silica coated PbS QDs were then conjugated with specifically designed cyclic arginine-glycine-aspartic acid (cRGD) peptide, that are able to specifically recognizes the αvβ3 integrins which is overexpressed in the angiogenic tumor induced vasculatures and on some solid tumours, in order to achieve a tumor-specific targeting...
November 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29148707/versatile-supermolecular-inclusion-complex-based-on-host-guest-interaction-for-targeted-gene-delivery
#20
Yunxia Sun, Jingyi Zhu, Wen-Xiu Qiu, Qi Lei, Si Chen, Xian-Zheng Zhang
A facile and targeted gene delivery system was prepared by conjugating β-cyclodextrin modified polyethylenimine (PEI-CD) and adamantyl peptide (AdGRGDS) based on host-guest interaction. With the rational design between PEI-CD and AdGRGDS, PEI-CD/AdGRGDS gene delivery system showed excellent DNA binding capability, and exhibited good ability to compact DNA into uniform spherical nanoparticles. In vitro luciferase assay showed that gene expression transfected by PEI-CD/AdGRGDS was stronger than that by PEI-CD in HeLa cells, whereas, gene expression transfected by PEI-CD/AdGRGDS and PEI-CD was similar to each other in COS7 cells...
November 17, 2017: ACS Applied Materials & Interfaces
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