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https://www.readbyqxmd.com/read/28224899/impact-of-plant-matrix-polysaccharides-on-cellulose-produced-by-surface-tethered-cellulose-synthases
#1
Snehasish Basu, Okako Omadjela, Jochen Zimmer, Jeffrey M Catchmark
Surface immobilized BcsA-B cellulose synthases synthesize crystalline cellulose II under in vitro conditions and were used to explore the interaction between cellulose and hemicelluloses and pectin. The morphology of the cellulose microfibrils changed in the presence of xyloglucan and glucomannan, while pectin did not significantly impact morphology. X-ray diffractometry and FT-IR spectroscopy indicated that crystal size and crystallinity were significantly affected by xyloglucan and glucomannan but not altered by pectin...
April 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28222361/biological-and-catalytic-applications-of-green-synthesized-fluorescent-n-doped-carbon-dots-using-hylocereus-undatus
#2
Velusamy Arul, Thomas Nesakumar Jebakumar Immanuel Edison, Yong Rok Lee, Mathur Gopalakrishnan Sethuraman
In this work, a simple hydrothermal route for the synthesis of fluorescent nitrogen doped carbon dots (N-CDs) is reported. The Hylocereus undatus (H. undatus) extract and aqueous ammonia are used as carbon and nitrogen source, respectively. The optical properties of synthesized N-CDs are analyzed using UV-Visible (UV-Vis) and fluorescence spectroscopy. The surface morphology, elemental composition, crystallinity and functional groups present in the N-CDs are examined using high resolution transmission electron microscopy (HR-TEM) with energy dispersive spectroscopy (EDS), selected area electron diffraction (SAED), X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectroscopy, respectively...
February 13, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28222263/reaction-mechanism-of-covalent-modification-of-phosphatidylethanolamine-lipids-by-reactive-aldehydes-4-hydroxy-2-nonenal-and-4-oxo-2-nonenal
#3
Katarina Vazdar, Danijela Vojta, Davor Margetić, Mario Vazdar
4-hydroxy-2-nonenal (HNE) and 4-oxo-2-nonenal (ONE) are biologically important reactive aldehydes formed during oxidative stress in phospholipid bilayers. They are highly reactive species due to presence of several reaction centers and can react with amino acids in peptides and proteins, as well as phosphoethanolamine (PE) lipids, thus modifying their biological activity. The aim of this work is to study in a molecular detail the reactivity of HNE and ONE towards PE lipids in a simplified system containing only lipids and reactive aldehydes in dichloromethane as an inert solvent...
February 21, 2017: Chemical Research in Toxicology
https://www.readbyqxmd.com/read/28221765/design-of-macroscopically-ordered-liquid-crystalline-hydrogel-columns-knitted-with-nanosilver-for-topical-applications
#4
Sudha Janardhanan Devaki, Reshma Lali Raveendran, Nishanth Kumar Sasidharan
Design of liquid crystalline hydrogels knitted with silver nanoparticles in macroscopic ordering are becoming subject of research interest due to their promising multifunctional applications in biomedical and opto-electronic applications. The present work describes the development of liquid crystalline Schiff-based hydrogel decorated with silver nanoparticles and demonstration of its antifungal applications. Schiff base was prepared from polyglucanaldehyde and chitosan and the former was prepared by the oxidation of amylose (polyglucopyranose) isolated from abundantly available unutilised jackfruit seed starch...
February 21, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28221758/synthesis-and-fabrication-of-collagen-coated-ostholamide-electrospun-nanofiber-scaffold-for-wound-healing
#5
Subramani Kandhasamy, Sathiamurthi Perumal, Balaraman Madhan, Narayanan Umamaheswari, Javaid Ahmad Banday, Paramasivan Thirumalai Perumal, Vichangal Pridiuldi Santhanakrishnan
A novel scaffold for effective wound healing treatment was developed utilizing natural product bearing collagen based biocompatible electro-spun nanofibres. Initially, ostholamide (OSA) was synthesized from osthole (a natural coumarin), characterized by 1H, 13C, DEPT-135 NMR, ESI-MS and FT-IR spectroscopy analysis. OSA was incorporated into Polyhydroxybutyrate (PHB) and Gelatin (GEL), which serve as templates for electro-spun nanofibers. The coating of OSA-PHB-GEL nanofibers with collagen resulted in PHB-GEL-OSA-COL nanofibrous scaffold which mimics extra cellular matrix and serves as an effective biomaterial for tissue engineering applications, especially for wound healing...
February 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28219840/effect-of-surface-functionalisation-on-the-interaction-of-iron-oxide-nanoparticles-with-polymerase-chain-reaction
#6
Ayse Beyza Aysan, Zdeněk Knejzlík, Pavel Ulbrich, Marek Šoltys, Aleš Zadražil, František Štěpánek
The combination of nanoparticles with the polymerase chain reaction (PCR) can have benefits such as easier sample handling or higher sensitivity, but also drawbacks such as loss of colloidal stability or inhibition of the PCR. The present work systematically investigates the interaction of magnetic iron oxide nanoparticles (MIONs) with the PCR in terms of colloidal stability and potential PCR inhibition due to interaction between the PCR components and the nanoparticle surface. Several types of MIONs with and without surface functionalisation by sodium citrate, dextran and 3-aminopropyl-triethoxysilane (APTES) were prepared and characterised by Transmission Electron Microscopy (TEM), dynamic light scattering (DLS) and Fourier Transform Infrared (FT-IR) spectroscopy...
February 6, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28219380/effects-of-nutritional-conditions-on-growth-and-biochemical-composition-of-tetraselmis-sp
#7
Mouna Dammak, Bilel Hadrich, Ramzi Miladi, Mohamed Barkallah, Faiez Hentati, Ridha Hachicha, Céline Laroche, Philippe Michaud, Imen Fendri, Slim Abdelkafi
BACKGROUND: This study aimed to maximize biomass concentration, biomass productivity and biochemical composition of the marine microalga Tetraselmis sp. METHODS: In the current study, Box-Behnken Design was used to model the effect of NaNO3, NaH2PO4, metals and vitamins in the F/2 medium on the growth, total chlorophylls, carotenoids and starch contents. The total chlorophylls content was quantified by spectrophotometry. The FT-IR spectroscopy was used to estimate the biochemical compositions of Tetraselmis sp...
February 20, 2017: Lipids in Health and Disease
https://www.readbyqxmd.com/read/28219034/preparation-of-core-shell-nanostructure-fe3o4-peg400-so3h-as-heterogeneous-and-magnetically-recyclable-nanocatalyst-for-one-pot-synthesis-of-substituted-pyrroles-by-paal-knorr-reaction-at-room-temperature
#8
Fahimeh Bonyasi, Malak Hekmati, Hojat Veisi
An efficient procedure has been proposed for the loading of sulfonic acid groups on the surface of polyethylene glycol 400 (PEG400)-encapsulated Fe3O4 nanoparticles to synthesize a core-shell Fe3O4@PEG400-SO3H nano catalyst. Surface functionalization of magnetic particles in such a way is a refined method of bridging the gap amongst heterogeneous and homogeneous catalysis. The procured nano catalyst was classified through Fourier transformed infrared spectroscopy (FT-IR), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), wavelength-dispersive X-ray spectroscopy (WDX), thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), X-ray photoelectron spectroscopy (XPS), BET, and back titration...
February 13, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28217326/crystal-structure-of-2-2-bipyrid-yl-2-6-bis-1-butyl-1h-benzimidazol-2-yl-pyridine-chlorido-iridium-iii-tri-fluoro-methane-sulfonate
#9
Victoria I Smith, Mohammad Nozari, Matthias Zeller, Anthony W Addison
The title complex compound, [Ir(C27H29N5)Cl(C10H8N2)](CF3SO3)2, was synthesized for a study of iridium(III)/periodate redox systems in water. The coordination geometry of the complex can be best described as distorted octa-hedral, with an r.m.s. deviation of 8.8 (8)% from ideal octa-hedral rectangular geometry. In the crystal, C-H⋯O and C-H⋯F inter-actions between the complex cation and the tri-fluoro-methane-sulfonate anions are observed, as well as a C-H⋯Cl inter-molecular inter-action between neighboring complex cations...
February 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28216875/antidermatophytic-and-protease-inhibiting-activities-of-zerumbone-a-natural-sesquiterpene-from-the-rhizome-of-zingiber-zerumbet-l-roscoe-ex-j-e-smith
#10
Madhavankutty Jyothilakshmi, Mathew Jyothis, Gokulanathan Nair Hari Narayanan, Mukalel Sankunni Latha
CONTEXT: Due to increase in the number of patients with impaired immunity, incidence of dermatophytoses has increased considerably. Antidermatophytic agents with anti-inflammatory and protease-inhibiting activities will help in restricting inflammatory response associated with dermatophytoses. AIMS: The present study aims to evaluate antidermatophytic and protease-inhibiting activities of zerumbone. Cytotoxicity was tested using Chang liver cell line as a preliminary step in toxicity study...
January 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/28215165/synthesis-characterization-and-comparison-of-local-analgesic-anti-inflammatory-ulcerogenic-activity-of-copper-and-zinc-complexes-of-indomethacin
#11
Abhijit Sukul, Saikat Kumar Poddar, Sanjana Haque, Sajal Kumar Saha, Sreedam Chandra Das, Zobaer Al Mahmud, S M AbdurRahman, Abhijit Sukul
BACKGROUND: Non-steroidal anti-inflammatory drugs (NSAID) exert gastrointestinal upset by inhibiting mucosal cyclooxygenase (COX) activity for which complexation technique with metals has been adopted to overcome this drawback. OBJECTIVE: The study aimed to overcome the gastrointestinal side effects associated with indomethacin treatment by synthesizing copper (Cu) and zinc (Zn) complexes of indomethacin along with assessing potential pharmacological effects of these complexes...
February 16, 2017: Anti-inflammatory & Anti-allergy Agents in Medicinal Chemistry
https://www.readbyqxmd.com/read/28214748/electrochemical-monitoring-of-biointeraction-by-graphene-based-material-modified-pencil-graphite-electrode
#12
Ece Eksin, Erhan Zor, Arzum Erdem, Haluk Bingol
Recently, the low-cost effective biosensing systems based on advanced nanomaterials have received a key attention for development of novel assays for rapid and sequence-specific nucleic acid detection. The electrochemical biosensor based on reduced graphene oxide (rGO) modified disposable pencil graphite electrodes (PGEs) were developed herein for electrochemical monitoring of DNA, and also for monitoring of biointeraction occurred between anticancer drug, Daunorubicin (DNR), and DNA. First, rGO was synthesized chemically and characterized by using UV-Vis, TGA, FT-IR, Raman Spectroscopy and SEM techniques...
February 11, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28213150/preparation-of-the-go-pd-nanocomposite-and-its-application-for-the-degradation-of-organic-dyes-in-water
#13
Afshan Omidvar, Babak Jaleh, Mahmoud Nasrollahzadeh
A GO/Pd nanocomposite has been successfully synthesized applying a simple method via immobilizing Pd on the surface of the graphene oxide (GO). The GO/Pd nanocomposite was characterized by X-ray diffraction (XRD), Fourier transformed infrared (FT-IR) spectroscopy, Raman, transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) techniques. The surface morphology of Pd NPs was viewed by TEM, the particles are spherical with an average particle size of 11nm...
February 9, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28213139/antimycobacterial-antimicrobial-activity-experimental-ft-ir-ft-raman-nmr-uv-vis-dsc-and-dft-transition-state-chemical-reactivity-nbo-nlo
#14
Poonam Rawat, R N Singh, Alok Ranjan, Sartaj Ahmad, Rajat Saxena
As part of a study of pyrrole hydrazone, we have investigated quantum chemical calculations, molecular geometry, relative energy, vibrational properties and antimycobacterial/antimicrobial activity of pyrrole-2-carboxaldehyde isonicotinyl hydrazone (PCINH), by applying the density functional theory (DFT) and Hartree Fock (HF). Good reproduction of experimental values is obtained and with small percentage error in majority of the cases in comparison to theoretical result (DFT). The experimental FT-IR and Raman wavenumbers were compared with the respective theoretical values obtained from DFT calculations and found to agree well...
February 11, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28211065/the-synthesis-of-weak-acidic-type-hybrid-monolith-via-thiol-ene-click-chemistry-and-its-application-in-hydrophilic-interaction-chromatography
#15
Jiao Zeng, Shengquan Liu, Menglin Wang, Shouzhuo Yao, Yingzhuang Chen
In this work, a porous structure and good permeability monolithic column was polymerized in UV transparent fused-silica capillaries via photo-initiated thiol-ene click polymerization of 2, 4, 6, 8-tetravinyl-2, 4, 6, 8- tetramethylcyclotetrasiloxane (TMTVS), pentaerythritol tetra(3-mercaptopropionate) (PETMP), itaconic acid, respectively, in the presence of porogenic solvents (tetrahydrofuran and methanol) and a initiator (2, 2-dimethoxy-2-phenylacetophenone) (DMPA) within 30 min. The physical properties of this monolith were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy and nitrogen adsorption/desorption measurements...
February 17, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28208286/derivatization-technique-to-identify-specifically-carbonyl-groups-by-infrared-spectroscopy-characterization-of-photooxidative-aging-products-in-terpenes-and-terpeneous-resins
#16
Stefan Zumbühl, Andreas Brändle, Andreas Hochuli, Nadim C Scherrer, Walter Caseri
Analysis of bioorganic materials by infrared spectroscopy (FT-IR) is frequently limited due to overlapping of diagnostic bands from the various components, which poses a fundamental problem to this analytical technique. The distinction of oxidized di- and triterpenes, for example, is hindered by the superposition of similar absorption bands of carbonyl functional groups summing up to a broad, nondistinctive signal. This study presents a technique for selective fluorination of various carboxylic acids by exposure to gaseous sulfur tetrafluoride...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28207756/structural-changes-on-a-molecular-basis-of-canola-meal-by-conditioning-temperature-and-time-during-pelleting-process-in-relation-to-physiochemical-energy-and-protein-properties-relevant-to-ruminants
#17
Xuewei Huang, Huihua Zhang, Peiqiang Yu
The objectives of this study were: (1) To investigate the effects of conditioning temperature (70, 80, 90°C), time (30, 60 sec), and interaction (temperature × time) during the pelleting process on internal protein molecular structure changes of the co-products; (2) To identify differences in protein molecular structures among pellets that were processed under different conditions, and between unprocessed mash and pellets; 3) To quantify protein molecular structure changes in relation to predicted energy and protein utilization in dairy cows...
2017: PloS One
https://www.readbyqxmd.com/read/28196394/synthesis-and-evaluation-of-a-triblock-copolymer-zno-nanoparticles-from-poly-%C3%AE%C2%B5-caprolactone-and-poly-acrylic-acid-as-a-potential-drug-delivery-carrier
#18
Lida Ahmadkhani, Ali Baghban, Shahram Mohammadpoor, Rovshan Khalilov, Abolfazl Akbarzadeh, Taras Kavetskyy, Siamak Saghfi, Aygun N Nasibova
Through the present paper, a triblock copolymer containing pH-responsive (polyacrylic acid-b-polycaprolactone -b-polyacrylic acid) (PAA-b-PCL-b-PAA) was synthesized by using the ring-opening polymerization (ROP) of ε-caprolactone (ε-CL) and the reversible addition fragmentation chain transfer (RAFT) polymerization of the acrylic acid methods, as the drug carrier. Blends of the nanocrystalline zinc oxide nanoparticles (n-ZnO) and triblock copolymer treated from the solution have been used to make the hybrid polymer-metal oxide for the preparation of the drug loaded nanocomposite...
February 14, 2017: Drug Research
https://www.readbyqxmd.com/read/28194259/anti-inflammatory-activity-of-a-sulfated-polysaccharide-isolated-from-an-enzymatic-digest-of-brown-seaweed-sargassum-horneri-in-raw-264-7-cells
#19
Kalu Kapuge Asanka Sanjeewa, Ilekkuttige Priyan Shanura Fernando, Eun-A Kim, Ginnae Ahn, Youngheun Jee, You-Jin Jeon
BACKGROUND/OBJECTIVES: Sargassum horneri is an edible brown alga that grows in the subtidal zone as an annual species along the coasts of South Korea, China, and Japan. Recently, an extreme amount of S. horneri moved into the coasts of Jeju Island from the east coast of China, which made huge economic and environmental loss to the Jeju Island. Thus, utilization of this biomass becomes a big issue with the local authorities. Therefore, the present study was performed to evaluate the anti-inflammatory potential of crude polysaccharides (CPs) extracted from S...
February 2017: Nutrition Research and Practice
https://www.readbyqxmd.com/read/28193365/a-new-and-recyclable-system-based-on-tropin-ionic-liquids-for-resolution-of-several-racemic-amino-acids
#20
Zhixia Wang, Zhenbo Hou, Shun Yao, Min Lin, Hang Song
A new, recyclable solid-liquid resolution system was developed based on tropin ionic liquids [CnDTr][L-Pro]2 for the enantiomeric resolution of racemic phenylalanine and other α-substituted carboxylic acids including tryptophan, tyrosine, benzene glycine and mandelic acid. With racemic phenylalanine as resolution model, effect factors were investigated for better resolution conditions. On the conditions, some efficient resolution were achieved, for instance the e.e. (98%) and product yield (76%) in solid phase for phenylalanine, and the e...
April 1, 2017: Analytica Chimica Acta
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