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https://www.readbyqxmd.com/read/29679743/dual-t-1-and-t-2-weighted-magnetic-resonance-imaging-based-on-gd-3-loaded-bioinspired-melanin-dots
#1
Liying Xu, Su Hyun Hong, Yao Sun, Ziyan Sun, Kangquan Shou, Kai Cheng, Hao Chen, Daijuan Huang, Haibo Xu, Zhen Cheng
In this report, a novel T1 /T2 dual modal nanoprobe based on highly efficient and bioinspired melanin dots (M-dots) with directly loading gadolinium (Gd-M-dots) for magnetic resonance imaging (MRI) is described. In vitro and in vivo investigations have revealed that Gd-M-dots showed nontoxicity and good biocompatibilitity. Gd-M-dots relaxivity values on 3 T were determined to be r1 =23.4 and r2 =123.3mM-1 s-1 , which were much higher than both Gd-DTPA (r1 =5.1, r2 =6.2mM-1 s-1 ) and Fe-M-dots (r1 =1.2, r2 =2...
April 18, 2018: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/29674069/intensely-red-emitting-luminescent-upconversion-nanoparticles-for-deep-tissue-multimodal-bioimaging
#2
Hongling Deng, Sa Huang, Chen Xu
Nowadays, in order to improve the diagnostic accuracy of the disease, more and more contrast agents have been applied in the clinical imaging modalities. A combination of nanotechnology with optical, computed X-ray tomography (CT), and magnetic resonance imaging (MRI) has great potential to improve disease diagnosis and therapy. Herein, we developed a novel multimodal contrast agent for deep-tissue bioimaging based on PEGylated Mn2+ doped NaLuF4 :Yb/Er nanoparticles (PEG-UCNPs). The multimodal nanoprobes have revealed the intensely red upconversion luminescence emission for deep-tissue upconversion luminescence (UCL) imaging...
July 1, 2018: Talanta
https://www.readbyqxmd.com/read/29674052/glycan-affinity-magnetic-nanoplatforms-for-urinary-glycobiomarkers-discovery-in-bladder-cancer
#3
Rita Azevedo, Janine Soares, Cristiana Gaiteiro, Andreia Peixoto, Luís Lima, Dylan Ferreira, Marta Relvas-Santos, Elisabete Fernandes, Ana Tavares, Sofia Cotton, Ana Luísa Daniel-da-Silva, Lúcio Lara Santos, Rui Vitorino, Francisco Amado, José Alexandre Ferreira
Bladder Cancer (BC) presents one of the highest recurrence rates amongst solid tumours and constitutes the second deadliest disease of the genitourinary track. Non-invasive identification of patients facing disease recurrence and/or progression remains one of the most critical and challenging aspects in disease management. To contribute to this goal, we demonstrate the potential of glycan-affinity glycoproteomics nanoplatforms for urinary biomarkers discovery in bladder cancer. Briefly, magnetic nanoprobes (MNP) coated with three broad-spectrum lectins, namely Concanavalin A (ConA; MNP@ConA), Wheat Germ Agglutinin (WGA; MNP@WGA), and Sambucus nigra (SNA; MNP@SNA), were used to selectively capture glycoproteins from the urine of low-grade and high-grade non-muscle invasive as well as muscle-invasive BC patients...
July 1, 2018: Talanta
https://www.readbyqxmd.com/read/29668126/an-unconventional-polymerization-route-to-hydrophilic-fluorescent-organic-nanoparticles-for-multicolor-cellular-bioimaging
#4
Qingfu Ban, Jie Kong, Yinglai Hou, Jianxin Chen, Wen Sun, Xiaofei Zhang, Si Wu
We demonstrated an unconventional polymerization route to synthesize hydrophilic fluorescent organic nanoparticles (FONs) for multicolor cellular bioimaging in this contribution. Actually, it benefits from our unexpected discovery of a rapid polymerization reaction between 1, 6-hexanediol dipropiolate and 2, 4, 6-triazide-1, 3, 5-triazine under the catalysis of N, N, N', N", N"-pentamethyldiethylenetriamine (PMDETA). Interestingly, the 2, 4, 6-triazide-1, 3, 5-triazine and PMDETA system can also induce rapid free radical polymerization at room temperature...
April 18, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29665290/timely-visualization-of-the-collaterals-formed-during-acute-ischemic-stroke-with-fe-3-o-4-nanoparticle-based-mr-imaging-probe
#5
Ting Wang, Yi Hou, Bo Bu, Wenxin Wang, Tiancong Ma, Chunyan Liu, Lan Lin, Lin Ma, Xin Lou, Mingyuan Gao
Ischemic stroke is one of the major leading causes for long-term disability and mortality. Collateral vessels provide an alternative pathway to protect the brain against ischemic injury after arterial occlusion. Aiming at visualizing the collaterals occurring during acute ischemic stroke, an integrin αv β3 -specific Fe3 O4 -Arg-Gly-Asp (RGD) nanoprobe is prepared for magnetic resonance imaging (MRI) of the collaterals. Rat models are constructed by occluding the middle cerebral artery for imaging studies of cerebral ischemia and ischemia-reperfusion on 7...
April 17, 2018: Small
https://www.readbyqxmd.com/read/29664602/engineering-persistent-luminescence-nanoparticles-for-biological-applications-from-biosensing-bioimaging-to-theranostics
#6
Shao-Kai Sun, He-Fang Wang, Xiu-Ping Yan
Persistent luminescence nanoparticles (PLNPs) are unique optical materials emitting long-lasting luminescence after ceasing excitation. Such a unique optical feature allows luminescence detection without constant external illumination to avoid the interferences of autofluorescence and scattering light from biological fluids and tissues. Besides, near-infrared (NIR) PLNPs have advantages of deep penetration and the reactivation of the persistent luminescence (PL) by red or NIR light. These features make the application of NIR-emitting PLNPs in long-term bioimaging no longer limited by the lifetime of PL...
April 17, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29660585/real-time-quartz-crystal-microbalance-cytosensor-based-on-a-signal-recovery-strategy-for-in-situ-and-continuous-monitoring-of-multiple-cell-membrane-glycoproteins
#7
Bin Zhou, Yan Hao, Dongping Long, Peihui Yang
A real-time quartz crystal microbalance (QCM) cytosensor based on a signal recovery strategy was first developed for in-situ and continuous monitoring of multiple cell membrane glycoproteins. In this work, gold nanoparticles (AuNPs) were linked with ligands to fabricate ligand-functionalized mass nanoprobes with signal amplification for increasing monitoring sensitivity. The mass nanoprobes bound to cell surface could be eluted with glycine-hydrochloric acid buffer, which led to a quick recovery of resonance frequency...
March 28, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29615648/enrichment-of-odmr-active-nitrogen-vacancy-centres-in-five-nanometre-sized-detonation-synthesized-nanodiamonds-nanoprobes-for-temperature-angle-and-position
#8
Shingo Sotoma, Daiki Terada, Takuya F Segawa, Ryuji Igarashi, Yoshie Harada, Masahiro Shirakawa
The development of sensors to estimate physical properties, and their temporal and spatial variation, has been a central driving force in scientific breakthroughs. In recent years, nanosensors based on quantum measurements, such as nitrogen-vacancy centres (NVCs) in nanodiamonds, have been attracting much attention as ultrastable, sensitive, accurate and versatile physical sensors for quantitative cellular measurements. However, the nanodiamonds currently available for use as sensors have diameters of several tens of nanometres, much larger than the usual size of a protein...
April 3, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29610993/mno-nanoparticles-with-unique-excitation-dependent-fluorescence-for-multicolor-cellular-imaging-and-mr-imaging-of-brain-glioma
#9
Junxin Lai, Tingjian Wang, Hao Wang, Fengqiang Shi, Wei Gu, Ling Ye
The authors describe MnO nanoparticles (NPs) with unique excitation-dependent fluorescence across the entire visible spectrum. These NPs are shown to be efficient optical nanoprobe for multicolor cellular imaging. Synthesis of the NPs is accomplished by a thermal decomposition method. The MnO NPs exhibit a high r1 relaxivity of 4.68 mM-1  s-1 and therefore give an enhanced contrast effect in magnetic resonance (MR) studies of brain glioma. The cytotoxicity assay, hemolysis analysis, and hematoxylin and eosin (H&E) staining tests verify that the MnO NPs are biocompatible...
April 2, 2018: Mikrochimica Acta
https://www.readbyqxmd.com/read/29610822/polydopamine-nanoparticles-for-the-treatment-of-acute-inflammation-induced-injury
#10
He Zhao, Zhandong Zeng, Lin Liu, Jiawen Chen, Huiting Zhou, Lili Huang, Jie Huang, Hua Xu, Yunyun Xu, Zhengrong Chen, Yi Wu, Wanliang Guo, Jiang Huai Wang, Jian Wang, Zhuang Liu
Nanotechnology-mediated anti-inflammatory therapy is emerging as a novel strategy for the treatment of inflammation-induced injury. However, one of the main hurdles for these anti-inflammatory nano-drugs is their potential toxic side effects in vivo. Herein, we uncovered that polydopamine (PDA) nanoparticles with their structure and chemical properties similar to melanin, a natural bio-polymer, displayed a significant anti-inflammation therapeutic effect on acute inflammation-induced injury. PDA with enriched phenol groups functioned as a radical scavenger to eliminate reactive oxygen species (ROS) generated during inflammatory responses...
April 3, 2018: Nanoscale
https://www.readbyqxmd.com/read/29604349/high-sensitive-and-multiple-detection-of-acute-myocardial-infarction-biomarkers-based-on-a-dual-readout-immunochromatography-test-strip
#11
Xiaoqun Gong, Bo Zhang, Jiafang Piao, Qian Zhao, Weichen Gao, Weipan Peng, Qi Kang, Dianming Zhou, Guiming Shu, Jin Chang
Immunochromatography test strip (ICTS) displayed high advantages in screening acute myocardial infarction (AMI) biomarkers. However, the low sensitivity and nonquantitative results seriously limited its clinical application. Herein, we designed a high sensitive, quantitative and dual-readout ICTS for assaying multiple AMI biomarkers based on magnetic nanoparticles (MNPs) quenching the fluorescence of Cy5, which was labeled on capture antibodies on test (T) lines. The changes of fluorescent intensity caused by MNPs nanoprobes enabled sensitively quantify cTnI and CK-MB for early diagnosis of AMI in 15min with a corresponding detection limit of 0...
March 28, 2018: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/29602311/cardiomyocyte-targeted-and-17%C3%AE-estradiol-loaded-acoustic-nanoprobes-as-a-theranostic-platform-for-cardiac-hypertrophy
#12
Xueli Zhao, Wen Luo, Jing Hu, Lei Zuo, Jing Wang, Rui Hu, Bo Wang, Lei Xu, Jing Li, Meng Wu, Pan Li, Liwen Liu
BACKGROUND: Theranostic perfluorocarbon nanoprobes have recently attracted attention due to their fascinating versatility in integrating diagnostics and therapeutics into a single system. Furthermore, although 17β-estradiol (E2) is a potential anti-hypertrophic drug, it has severe non-specific adverse effects in various organs. Therefore, we have developed cardiomyocyte-targeted theranostic nanoprobes to achieve concurrent targeted imaging and treatment of cardiac hypertrophy. RESULTS: We had successfully synthesized E2-loaded, primary cardiomyocyte (PCM) specific peptide-conjugated nanoprobes with perfluorocarbon (PFP) as a core (PCM-E2/PFPs) and demonstrated their stability and homogeneity...
March 30, 2018: Journal of Nanobiotechnology
https://www.readbyqxmd.com/read/29596391/screen-printed-electrodes-modified-with-green-metals-for-electrochemical-stripping-analysis-of-toxic-elements
#13
REVIEW
Anastasios Economou
This work reviews the field of screen-printed electrodes (SPEs) modified with "green" metals for electrochemical stripping analysis of toxic elements. Electrochemical stripping analysis has been established as a useful trace analysis technique offering many advantages compared to competing optical techniques. Although mercury has been the preferred electrode material for stripping analysis, the toxicity of mercury and the associated legal requirements in its use and disposal have prompted research towards the development of "green" metals as alternative electrode materials...
March 29, 2018: Sensors
https://www.readbyqxmd.com/read/29595964/in-situ-cellular-glycan-analysis
#14
Yunlong Chen, Lin Ding, Huangxian Ju
Glycan decorates all mammalian cell surfaces through glycosylation, which is one of the most important post-modifications of proteins. Glycans mediate a wide variety of biological processes, including cell growth and differentiation, cell-cell communication, immune response, pathogen interaction, and intracellular signaling events. Besides, tumor cells aberrantly express distinct sets of glycans, which can indicate different tumor onsets and progression processes. Thus, analysis of cellular glycans may contribute to understanding of glycan-related biological processes and correlation of glycan patterns with disease states for clinical diagnosis and treatment...
March 29, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29594841/a-two-wavelength-fluorescence-recovery-method-for-the-simultaneous-determination-of-aureomycin-and-oxytetracycline-by-using-gold-nanocrystals-modified-with-serine-and-11-mercaptoundecanoic-acid
#15
Yaning Mao, Yufeng Wu, Yongyin Nie, Jun Wang, Yuanyuan Liu, Shenghao Xu, Xiliang Luo
A method is described for rapid (1 h) synthesis of gold nanoclusters (AuNCs) co-functionalized with serine and 11-mercaptoundecanoic acid. The co-functionalized AuNCs exhibit good stability towards temperature, pH values, and over time. They were characterized by atomic force microscopy, high-resolution transmission electron microscopy, dynamic light scattering, and by fluorescence, IR and X-ray photoelectron spectroscopies. The fluorescence of the AuNCs is quenched by Hg(II) and restored on subsequent addition of aureomycin (CTC) or oxytetracycline (OTC)...
March 14, 2018: Mikrochimica Acta
https://www.readbyqxmd.com/read/29594715/mos-2-quantum-dots-modified-with-a-labeled-molecular-beacon-as-a-ratiometric-fluorescent-gene-probe-for-fret-based-detection-and-imaging-of-microrna
#16
Xinsheng Yu, Lianzhe Hu, Feng Zhang, Min Wang, Zhining Xia, Weili Wei
A dual-channel ratiometric nanoprobe is described for detection and imaging of microRNA. It was prepared from MoS2 quantum dots (QDs; with blue emission and excitation/emission peaks at 310/398 nm) which acts as both the gene carrier and as a donor in fluorescence resonance energy transfer (FRET). Molecular beacons containing loops for molecular recognition of microRNA and labeled with carboxyfluorescein (FAM) were covalently attached to the MoS2 QDs and serve as the FRET acceptor. In the absence of microRNA, the nanoprobe exhibits low FRET efficiency due to the close distance between the FAM tag and the QDs...
March 27, 2018: Mikrochimica Acta
https://www.readbyqxmd.com/read/29594667/magnetic-nanoparticles-coated-with-a-molecularly-imprinted-polymer-doped-with-manganese-doped-zns-quantum-dots-for-the-determination-of-2-4-6-trichlorophenol
#17
Xiao Wei, Miaomiao Yu, Chen Li, Xinghui Gong, Fang Qin, Zhenhong Wang
The authors describe a multifunctional magnetic molecularly imprinted phosphorescent nanoparticle probe for the selective determination of 2,4,6-trichlorophenol (2,4,6-TCP). The probe consists of a magnetite (Fe3 O4 ) core that is coated with a molecularly imprinted polymer doped with Mn-doped ZnS quantum dots (QDs). The MIP was obtained by copolymerization of acrylamide, ethylene glycol dimethacrylate, and 2,4,6-TCP. The resulting nanoprobe shows strong phosphorescence (with excitation/emission peaks at 320/594 nm) due to the presence of the QDs, good magnetism, and high selectivity for 2,4,6-TCP...
March 5, 2018: Mikrochimica Acta
https://www.readbyqxmd.com/read/29594600/a-ratiometric-upconversion-nanoprobe-for-fluorometric-turn-on-detection-of-sulfite-and-bisulfite
#18
Shuailiang Wang, Xiaozheng Cao, Tang Gao, Xiaobo Wang, Hui Zou, Wenbin Zeng
A nanoprobe is described for the ratiometric fluorometric determination of sulfite ions. Upconversion nanoparticles (UCNPs) of the type β-NaYF4 :Yb(III),Er(III),Tm(III) were covalently modified with the molecular probe HIAN which is a hydroxynaphthalimide fluorophore modified with a (cationic) indolinium moiety. Under excitation at 980 nm, the green emission of the UCNPs (peaking at 543 nm) is almost totally quenched, while the NIR emission (peaking at 802 nm) remains unaffected. In the presence of sulfite or bisulfite (hydrogen sulfite), the green fluorescence is restored and can be visually observed...
March 12, 2018: Mikrochimica Acta
https://www.readbyqxmd.com/read/29594587/dually-emitting-gold-silver-nanoclusters-as-viable-ratiometric-fluorescent-probes-for-cysteine-and-arginine
#19
Mingwang Liu, Na Li, Yu He, Yili Ge, Gongwu Song
Glutathione coated gold and silver nanoclusters (GSH-Au/AgNCs) were synthesized by one-pot reduction methods and are found to be viable fluorescent nanoprobes for cysteine (Cys) and arginine (Arg), with good selectivity over other amino acids. The GSH-Au/AgNCs have two emissions at 616 nm and 412 nm when excited at 360 nm. With the increased concentration of Cys, the ratio of the emission intensities (I616 /I412 ) linearly decreases with Cys in concentration ranging from 0.05 to 10 μM and from 10 to 50 μM, respectively...
January 31, 2018: Mikrochimica Acta
https://www.readbyqxmd.com/read/29594585/photoinduced-discharge-of-electrons-stored-in-a-tio2-mwcnt-composite-to-an-analyte-application-to-the-fluorometric-determination-of-hydrogen-peroxide-glucose-and-aflatoxin-b1
#20
Amina Rhouati, Muhammad Nasir, Jean-Louis Marty, Akhtar Hayat
The authors describe an analytical detection scheme based on the use of multiwalled carbon nanotubes (MWCNTs) that accept and store electrons upon contact with photo-irradiated TiO2 nanoparticles (TiO2 -NPs). The Fermi level equilibration with photo-irradiated TiO2 -NPs has a storage value of 0.35 mM of electrons per 120 mg·L-1 of MWCNTs. The stored electrons can be discharged on demand upon addition of electron acceptors to the TiO2 -NP/MWCNT composite. These findings are applied to detect the quencher hydrogen peroxide...
December 6, 2017: Mikrochimica Acta
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