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https://www.readbyqxmd.com/read/28231527/rapid-discrimination-and-determination-of-antibiotics-drugs-in-plastic-syringes-using-near-infrared-spectroscopy-with-chemometric-analysis-application-to-amoxicillin-and-penicillin
#1
Laetitia Minh Mai Lê, Luc Eveleigh, Ikram Hasnaoui, Patrice Prognon, Arlette Baillet-Guffroy, Eric Caudron
The aim of this study was to investigate near infrared spectroscopy (NIRS) combined to chemometric analysis to discriminate and quantify three antibiotics by direct measurement in plastic syringes.Solutions of benzylpenicillin (PENI), amoxicillin (AMOX) and amoxicillin/clavulanic acid (AMOX/CLAV) were analyzed at therapeutic concentrations in glass vials and plastic syringes with NIR spectrometer by direct measurement. Chemometric analysis using partial least squares regression and discriminative analysis was conducted to develop qualitative and quantitative calibration models...
February 14, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28231500/silver-nanoparticle-embedded-graphene-oxide-methotrexate-for-targeted-cancer-treatment
#2
Raj Kumar Thapa, Jae Hee Kim, Jee-Heon Jeong, Beom Soo Shin, Han-Gon Choi, Chul Soon Yong, Jong Oh Kim
Combination therapies are widely investigated cancer treatment modalities. Carbon based systems such as graphene oxide (GO), plasmonic nanoparticles such as silver nanoparticles (AgNPs), and the folate analog, methotrexate (MTX), have been separately studied for their potential anticancer effects. In this study, we combined these systems to develop AgNPs-embedded GO with conjugated MTX (MTX-GO/AgNPs) and studied their folate receptor-targeted anticancer effects. Results revealed successful formation of AgNPs on GO along with MTX conjugation as suggested by UV/visible, TEM, AFM, FTIR, and XRD analysis...
February 13, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28231482/fourier-transform-infrared-and-raman-spectroscopy-in-the-study-of-phase-transitions-in-dipyrazolium-iodide-triiodide-experimental-and-theoretical-analysis
#3
M Węcławik, J Baran, P Durlak, Ł Marciniak, A Piecha-Bisiorek, R Jakubas
The paper presents the Infrared and Raman spectra of the powdered [C3N2H5(+)]2[I(-)∙I3(-)] crystal at the temperature intervals of 11-270K, covering two low-temperature phase transitions: discontinuous at 182/188K (cooling/heating) and continuous at 254K. The research shows that the vibrational states of the pyrazolium cations change significantly during discontinuous phase transition (III→II), while the continuous nature of successive structural transformation is more subtle and displays an insignificant change in the temperature coefficient of numerous vibrations during the II→I PT at 254K...
February 16, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28231432/dismantling-the-red-wall-of-colloidal-perovskites-highly-luminescent-formamidinium-and-formamidinium-cesium-lead-iodide-nanocrystals
#4
Loredana Protesescu, Sergii Yakunin, Sudhir Kumar, Janine Bär, Federica Bertolotti, Norberto Masciocchi, Antonietta Guagliardi, Matthias Grotevent, Ivan Shorubalko, Maryna I Bodnarchuk, Chih-Jen Shih, Maksym V Kovalenko
Colloidal nanocrystals (NCs) of APbX3-type lead halide perovskites [A=Cs+, CH3NH3+ (methylammonium or MA+) or CH(NH2)2+ (formamidinium or FA+); X=Cl-, Br-, I-] have recently emerged as highly versatile photonic sources for applications ranging from simple photoluminescence down-conversion (e.g., for display backlighting) to light emitting diodes. From the perspective of spectral coverage, a formidable challenge facing the use of these materials is how to obtain stable emissions in the red and infrared spectral regions covered by the iodide-based compositions...
February 23, 2017: ACS Nano
https://www.readbyqxmd.com/read/28231145/recent-advances-in-techniques-for-starch-esters-and-the-applications-a-review
#5
REVIEW
Jing Hong, Xin-An Zeng, Charles S Brennan, Margaret Brennan, Zhong Han
Esterification is one of the most important methods to alter the structure of starch granules and improve its applications. Conventionally, starch esters are prepared by conventional or dual modification techniques, which have the disadvantages of being expensive, have regent overdoses, and are time-consuming. In addition, the degree of substitution (DS) is often considered as the primary factor in view of its contribution to estimate substituted groups of starch esters. In order to improve the detection accuracy and production efficiency, different detection techniques, including titration, nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy (FT-IR), thermal gravimetric analysis/infrared spectroscopy (TGA/IR) and headspace gas chromatography (HS-GC), have been developed for DS...
July 9, 2016: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/28231085/extraction-identification-and-photo-physical-characterization-of-persimmon-diospyros-kaki-l-carotenoids
#6
Khalil Zaghdoudi, Orleans Ngomo, Régis Vanderesse, Philippe Arnoux, Bauyrzhan Myrzakhmetov, Céline Frochot, Yann Guiavarc'h
Carotenoid pigments were extracted and purified from persimmon fruits using accelerated solvent extraction (ASE). Eleven pigments were isolated and five of them were clearly identified as all-trans-violaxanthine, all-trans-lutein, all-trans-zeaxanthin all-trans-cryptoxanthin and all-trans-β-carotene. Absorption and fluorescence spectra were recorded. To evaluate the potential of ¹O₂ quenching of the purified carotenoids, we used a monocarboxylic porphyrin (P1COOH) as the photosensitizer to produce ¹O₂...
January 12, 2017: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/28231069/the-potential-of-transcranial-photobiomodulation-therapy-for-treatment-of-major-depressive-disorder
#7
Farzad Salehpour, Seyed Hossein Rasta
Major depressive disorder is a common debilitating mood disorder that affects quality of life. Prefrontal cortex abnormalities, an imbalance in neurotransmitters, neuroinflammation, and mitochondrial dysfunction are the major factors in the etiology of major depressive disorder. Despite the efficacy of pharmacotherapy in the treatment of major depressive disorder, 30%-40% of patients do not respond to antidepressants. Given this, exploring the alternative therapies for treatment or prevention of major depressive disorder has aroused interest among scientists...
February 23, 2017: Reviews in the Neurosciences
https://www.readbyqxmd.com/read/28231046/original-research-paper-a-superior-preparation-method-for-daidzein-hydroxypropyl-%C3%AE-cyclodextrin-complexes-with-improved-solubility-and-dissolution-supercritical-fluid-process
#8
Hao Pan, Han-Bing Wang, Yi-Bin Yu, Bing-Chao Cheng, Xiao-Yu Wang, Ying Li
Advantages of the supercritical fluid (SCF) process compared to the conventional solution stirring method (CSSM) in the preparation of daidzein-hydroxypropyl-β-cyclodextrin (HPβCD) complexes were investigated. Formation of daidzein/ HPβCD inclusion complexes was confirmed by Fourier transformed-infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Particle size, inclusion yield, drug solubility and dissolution of daidzein/HPβCD complexes were evaluated...
March 1, 2017: Acta Pharmaceutica
https://www.readbyqxmd.com/read/28231002/mid-infrared-photoluminescence-up-to-290-k-reveals-radiative-mechanisms-and-substrate-doping-type-effects-of-inas-nanowires
#9
Xiren Chen, Qiandong Zhuang, Hayfaa Alradhi, ZhiMing Jin, Liangqing Zhu, Xin Chen, Jun Shao
Photoluminescence (PL) as a conventional yet powerful optical spectroscopy may provide crucial insight into the mechanism of carrier recombination and bandedge structure in semiconductors. In this study, mid-infrared PL measurements on vertically aligned InAs nanowires (NWs) are realized for the first time in a wide temperature range of up to 290 K, by which the radiative recombinations are clarified in the NWs grown on n- and p-type Si substrates, respectively. A dominant PL feature is identified to be from the type-II optical transition across the interfaces between the zinc-blend (ZB) and the wurtzite (WZ) InAs, a lower-energy feature at low temperatures is ascribed to impurity-related transition, and a higher-energy feature at high temperatures originates in the interband transition of the WZ InAs being activated by thermal-induced electron transfer...
February 23, 2017: Nano Letters
https://www.readbyqxmd.com/read/28230816/new-route-synthesis-of-thiadiazoles-bisthiadiazoles-thiadiazolotriazines-and-pyrazolothiadiazoles-based-on-hydrazonoyl-halides-and-dihydrazinylthiadiazole
#10
Abdelwahed R Sayed, Shar Saad Al-Shihry
Synthesis and characterization of new thiadiazoles, bisthiadiazoles from the reaction of mono- and di-hydrazonoyl halides with various hydrazinecarbodithioate derivatives were studied. Treatment of hydrazonoyl halides with 2,5-dihydrazinyl-1,3,4-thiadiazole afforded new bistriazines containing thiadiazole; we also examined the reaction of 2,5-dihydrazinyl-1,3,4-thiadiazole with active methylene compounds to afford new pyrazoles containing thiadiazole compounds. The new synthesized compounds were identified by elemental analysis and various spectral data (Fourier transform infrared spectroscopy, mass spectrometry, 1H and 13C nuclear magnetic resonance)...
February 21, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28230805/preparation-of-photoirradiation-molecular-imprinting-polymer-for-selective-separation-of-branched-cyclodextrins
#11
Haoran Fan, Jinpeng Wang, Qingran Meng, Xueming Xu, Tianming Fan, Zhengyu Jin
In the present study, photoirradiation molecularly imprinted polymer (MIP) with azobenzene was used as a functional monomer for the selective separation of the branched cyclodextrins. The functional monomer 4-methacryloyloxy azobenzene (MAA) and the molecular template 6-O-α-d-maltosyl-β-cyclodextrin (G2-β-CD) were implemented for the molecular imprinting. The core-shell structure of photoirradiation MIP was visualized by the transmission electron microscopy (TEM). With Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA), we identified that G2-β-CD was imprinted into the polymer and removed from the MIP...
February 21, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28230792/static-hot-air-and-infrared-rays-roasting-are-efficient-methods-for-aflatoxin-decontamination-on-hazelnuts
#12
Ilenia Siciliano, Barbara Dal Bello, Giuseppe Zeppa, Davide Spadaro, Maria Lodovica Gullino
Aflatoxins are a group of secondary metabolites produced by members of Aspergillus Section Flavi that are dangerous to humans and animals. Nuts can be potentially contaminated with aflatoxins, often over the legal threshold. Food processes, including roasting, may have different effects on mycotoxins, and high temperatures have proven to be very effective in the reduction of mycotoxins. In this work, two different roasting methods-traditional static hot air roasting and infra-red rays roasting-were applied and compared for the detoxification of hazelnuts from Italy and Turkey...
February 21, 2017: Toxins
https://www.readbyqxmd.com/read/28230756/synthesis-and-structural-evaluation-of-organo-ruthenium-complexes-with-%C3%AE-diketonates
#13
Matija Uršič, Tanja Lipec, Anton Meden, Iztok Turel
Four novel ruthenium organometallic complexes: [(η⁶-p-cymene)Ru(4,4,4-trifluoro-1-(4-bromophenyl)-1,3-butanedione)Cl] (1), [(η⁶-p-cymene)Ru(4,4,4-trifluoro-1-(4-bromophenyl)-1,3-butanedione)pta]PF₆ (2), [(η⁶-p-cymene)Ru(4,4,4-trifluoro-1-(4-iodophenyl)-1,3-butanedione)Cl] (3) and [(η⁶-p-cymene)Ru(4,4,4-trifluoro-1-(4-iodophenyl)-1,3-butanedione)pta]PF₆ (4) were synthesized and characterized by elemental analysis, infrared (IR), UV-Vis, NMR and mass spectroscopy and single-crystal X-ray diffraction...
February 20, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28230380/effects-of-6-hydroxyceramides-on-the-thermotropic-phase-behavior-and-permeability-of-model-skin-lipid-membranes
#14
Andrej Kovacik, Michaela Silarova, Petra Pullmannová, Jaroslav Maixner, Katerina Vavrova
Ceramides (Cer) based on 6-hydroxysphingosine are important components of the human skin barrier, the stratum corneum. Although diminished concentrations of 6-hydroxyCer have been detected in skin diseases such as atopic dermatitis, our knowledge of these unusual sphingolipids, which have only been found in the skin, is limited. In this work, we investigate the biophysical behavior of N-lignoceroyl 6-hydroxysphingosine (Cer NH) in multilamellar lipid membranes composed of Cer/free fatty acids (C16-C24)/cholesterol/cholesteryl sulfate...
February 23, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28230297/spectroscopic-observation-of-a-hydrogenated-co-dimer-intermediate-during-co-reduction-on-cu-100-electrodes
#15
Elena Pérez-Gallent, Marta C Figueiredo, Federico Calle-Vallejo, Marc T M Koper
Carbon dioxide and carbon monoxide can be electrochemically reduced to useful products such as ethylene and ethanol on copper electrocatalysts. The process is yet to be optimized and the exact mechanism and the corresponding reaction intermediates are under debate or unknown. In particular, it has been hypothesized that the C-C bond formation proceeds via CO dimerization and further hydrogenation. Although computational support for this hypothesis exists, direct experimental evidence has been elusive. In this work, we detect a hydrogenated dimer intermediate (OCCOH) using Fourier transform infrared spectroscopy at low overpotentials in LiOH solutions...
February 23, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28229943/in-situ-hybrid-nano-drug-delivery-system-ihn-dds-of-antiretroviral-drug-for-simultaneous-targeting-to-multiple-viral-reservoirs-an-in-vivo-proof-of-concept
#16
Anil B Jindal, Sagar S Bachhav, Padma V Devarajan
We report In situ hybrid nano drug delivery system (IHN-DDS) of nevirapine (NVP) for simultaneous targeting to multiple viral reservoirs. The IHN-DDS system was comprised of a preconcentrate containing NVP, lipid, and a surfactant which when diluted with water resulted in the formation of nanoparticles of size range varied from 70 to 1100nm. Transmission electron microscopy and small angle neutron scattering studies of pellet and supernatant obtained after centrifugation of the IHN-DDS revealed spherical shaped nanoparticles and assembled structures, respectively...
February 13, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28229586/chlorhexidine-loaded-amorphous-calcium-phosphate-nanoparticles-for-inhibiting-degradation-and-inducing-mineralization-of-type-i-collagen
#17
Xue Cai, Bing Han, Yan Liu, Fucong Tian, Fuxin Liang, Xiaoyan Wang
A major shortcoming of contemporary dentin adhesives is their limited durability. Exposed collagen fibrils within the bonding interface are degraded by matrix metalloproteinases (MMPs), resulting in aging of the resin-dentin bond. In this study, chlorhexidine-loaded amorphous calcium phosphate (ACP) nanoparticles were synthesized to induce the mineralization of collagen fibrils. The nanoparticles sustainably released chlorhexidine, to inhibit MMPs during mineralization. Three types of ACP nanoparticles were prepared: N-ACP containing no chlorhexidine, C-ACP containing chlorhexidine acetate, and G-ACP containing chlorhexidine gluconate, which had a higher drug-loading than C-ACP...
February 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28229557/ultrabroadband-mos2-photodetector-with-spectral-response-from-445-to-2717-nm
#18
Ying Xie, Bo Zhang, Shuxian Wang, Dong Wang, Aizhu Wang, Zeyan Wang, Haohai Yu, Huaijin Zhang, Yanxue Chen, Mingwen Zhao, Baibiao Huang, Liangmo Mei, Jiyang Wang
Photodetectors with excellent detecting properties over a broad spectral range have advantages for the application in many optoelectronic devices. Introducing imperfections to the atomic lattices in semiconductors is a significant way for tuning the bandgap and achieving broadband response, but the imperfection may renovate their intrinsic properties far from the desire. Here, by controlling the deviation from the perfection of the atomic lattice, ultrabroadband multilayer MoS2 photodetectors are originally designed and realized with the detection range over 2000 nm from 445 nm (blue) to 2717 nm (mid-infrared)...
February 23, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28229133/towards-enhanced-optical-sensor-performance-seira-and-sers-with-plasmonic-nanostars
#19
O Bibikova, J Haas, A I López-Lorente, A Popov, M Kinnunen, I Meglinski, B Mizaikoff
We report the preparation and characterization of plasmonic chip-based systems comprising self-assembled gold nanostars at silicon substrates that enable concomitantly enhanced Raman (surface enhanced Raman spectroscopy; SERS) and mid-infrared (surface enhanced infrared reflection or absorption spectroscopy; SEIRA) spectral signatures. The high-aspect-ratio structure of gold nanostars provides an increased number of hot spots at their surface, which results in an electric field enhancement around the nanomaterial...
February 23, 2017: Analyst
https://www.readbyqxmd.com/read/28228941/renal-ischemia-reperfusion-induced-cardiac-hypertrophy-in-mice-cardiac-morphological-and-morphometric-characterization
#20
Rogério Cirino-Silva, Fernanda V Kmit, Mayra Trentin-Sonoda, Karina K Nakama, Karine Panico, Juliana M Alvim, Thiago R Dreyer, Herculano Martinho-Silva, Marcela S Carneiro-Ramos
BACKGROUND: Tissue remodeling is usually dependent on the deposition of extracellular matrix that may result in tissue stiffness and impaired myocardium contraction. OBJECTIVES: We had previously demonstrated that renal ischemia/reperfusion (I/R) is able to induce development of cardiac hypertrophy in mice. Therefore, we aimed to characterize renal I/R-induced cardiac hypertrophy. DESIGN: C57BL/6 J mice were subjected to 60 minutes' unilateral renal pedicle occlusion, followed by reperfusion (I/R) for 5, 8, 12 or 15 days...
January 2017: JRSM Cardiovascular Disease
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