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https://www.readbyqxmd.com/read/28532114/hypocrellin-b-and-nano-silver-loaded-polymeric-nanoparticles-enhanced-generation-of-singlet-oxygen-for-improved-photodynamic-therapy
#1
Subramanian Natesan, Venkateshwaran Krishnaswami, Chandrasekar Ponnusamy, Madi Madiyalakan, Thomas Woo, Rajaguru Palanisamy
A nanoparticulate photodynamic approach was employed with an objective to achieve enhanced production of singlet oxygen ((1)O2), for the management of posterior segment eye diseases like age related macular degeneration. The hypocrellin B (HB) loaded poly lactide-co-glycolide nanoparticle formulations were incorporated with nano silver (HBS-NPs). The optimized HBS-NPs contained 2.60±0.06mg/mL of HB and showed (i) 135.6 to 828.2nm size range, and (ii) negative zeta potential with a narrow polydispersity index...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532097/influence-of-telopeptides-on-the-structural-and-physical-properties-of-polymeric-and-monomeric-acid-soluble-type-i-collagen
#2
Róisín Holmes, Steve Kirk, Giuseppe Tronci, Xuebin Yang, David Wood
Currently two factors hinder the use of collagen as building block of regenerative devices: the limited mechanical strength in aqueous environment, and potential antigenicity. Polymeric collagen is naturally found in the cross-linked state and is mechanically tougher than the monomeric, acid-soluble collagen ex vivo. The antigenicity of collagen, on the other hand, is mainly ascribed to inter-species variations in amino acid sequences of the non-helical terminal telopeptides. These telopeptides can be removed through enzymatic treatment to produce atelocollagen, although the effect of this cleavage on triple helix organization, amino acidic composition and thermal properties is often disregarded...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532063/biodegradable-galactitol-based-crosslinked-polyesters-for-controlled-release-and-bone-tissue-engineering
#3
Janeni Natarajan, Sahitya Movva, Giridhar Madras, Kaushik Chatterjee
Various classes of biodegradable polymers have been explored towards finding alternates for the existing treatments for bone disorders. In this framework, two families of polyesters using an array of crosslinkers were synthesized. One was based on galactiol/adipic acid and the other based on galactitol/dodecanedioic acid. The structures of the polymers were confirmed by FTIR and further confirmed by (1)H NMR. DSC showed that the polymers were amorphous and the glass transition temperature increased with increase in crosslinking...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532050/full-in-vitro-analyses-of-new-generation-bulk-fill-dental-composites-cured-by-halogen-light
#4
Tuçe Hazal Tekin, Aysel Kantürk Figen, Pınar Yılmaz Atalı, Bilge Coşkuner Filiz, Mehmet Burçin Pişkin
The objective of this study was to investigate the full in-vitro analyses of new-generation bulk-fill dental composites cured by halogen light (HLG). Two types' four composites were studied: Surefill SDR (SDR) and Xtra Base (XB) as bulk-fill flowable materials; QuixFill (QF) and XtraFill (XF) as packable bulk-fill materials. Samples were prepared for each analysis and test by applying the same procedure, but with different diameters and thicknesses appropriate to the analysis and test requirements. Thermal properties were determined by thermogravimetric analysis (TG/DTG) and differential scanning calorimetry (DSC) analysis; the Vickers microhardness (VHN) was measured after 1, 7, 15 and 30days of storage in water...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532029/surfactin-loaded-polyvinyl-alcohol-pva-nanofibers-alters-adhesion-of-listeria-monocytogenes-to-polystyrene
#5
J J Ahire, D D Robertson, A J van Reenen, L M T Dicks
Surfactin-loaded polyvinyl alcohol (PVA) nanofibers were spun using gravity electrospinning. Scanning electron microscopy (SEM) images showed that nanofibers spun with surfactin are free from bead formation and uniform in diameter. The average nanofiber diameters were decreased (273±39nm, 259±39nm and 217±33nm) with increasing levels of surfactin (0.5, 1.0 and 1.5%, w/v) into PVA (10%, w/v). The 10% (w/v) PVA had average fiber diameter of 303±33nm. Atomic force microscopy (AFM) analysis showed that fibers spun with surfactin are not smooth as PVA fibers...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532019/characterization-of-bladder-acellular-matrix-hydrogel-with-inherent-bioactive-factors
#6
Dan Jiang, Jianwen Huang, Huili Shao, Xuechao Hu, Lujie Song, Yaopeng Zhang
Bladder acellular matrix (BAM) hydrogel may have great potential in tissue engineering due to outstanding biocompatibility and the presence of inherent bioactive factors in BAM. In this study, we prepared the BAM hydrogel by the method of enzymatic solubilization with pepsin and characterize the microrheological properties of the BAM precursor solution. The structures of the BAM hydrogel were characterized by scanning electron microscope (SEM), Fourier-transform infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC)...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531991/multifunctional-polymer-drug-loading-system-with-ph-sensitive-fluorescent-and-targeting-property
#7
Xuening Fei, Shubei Li, Lingyun Cao, Baolian Zhang, Miaozhuo Yu
IA multifunctional drug loading system with pH-sensitive, fluorescent and targeting property was fabricated. Firstly, the amphipathic N-octyl-N'-(2-carboxyl-cyclohexamethenyl) chitosan (OCCC) was prepared by grafting hydrophobic octyl group and hydrophilic hexahydrophthalic anhydride onto chitosan, then it was modified with folic acid (FA) and thiazole orange (TO) using polyethylene glycol (PEG) as the link to fabricate a multifunctional drug loading system TO-PEG-OCCC-PEG-FA. Its chemical structure was determined by Fourier transform infrared spectroscopy (FT-IR), elemental analysis, differential scanning calorimetry (DSC) analysis, UV-vis and fluorescence spectrometer, and the results showed that the substitution degree of hydrophobic/hydrophilic group onto chitosan were 41...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531980/self-assembled-nanomicelles-of-damnacanthal-loaded-amphiphilic-modified-chitosan-preparation-characterization-and-cytotoxicity-study
#8
Pakin Sukamporn, Seung Joon Baek, Wandee Gritsanapan, Suwabun Chirachanchai, Thararat Nualsanit, Pleumchitt Rojanapanthu
Damnacanthal (Dam) is a phytochemical with many pharmacological properties including anticancer activity. However, its hydrophobicity, poor bioavailability and stability limit its application in many biological approaches. In this study, Dam nanomicelles as an emerging platform were developed to overcome limitations. The deoxycholic and poly(ethylene glycol) methyl ether grafted chitosan (DCA-CS-mPEG) was synthesized and characterized by FTIR and (1)H NMR and the degree of substitution (DS) was determined by elemental analysis (EA)...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531852/two-step-sequential-pretreatment-for-the-enhanced-enzymatic-hydrolysis-of-coffee-spent-waste
#9
Rajeev Ravindran, Swarna Jaiswal, Nissreen Abu-Ghannam, Amit K Jaiswal
In the present study, eight different pretreatments of varying nature (physical, chemical and physico-chemical) followed by a sequential, combinatorial pretreatment strategy was applied to spent coffee waste to attain maximum sugar yield. Pretreated samples were analysed for total reducing sugar, individual sugars and generation of inhibitory compounds such as furfural and hydroxymethyl furfural (HMF) which can hinder microbial growth and enzyme activity. Native spent coffee waste was high in hemicellulose content...
May 11, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28530586/characterization-of-textural-rheological-thermal-microstructural-and-water-mobility-in-wheat-flour-dough-and-bread-affected-by-trehalose
#10
Bo Peng, Youqian Li, Shiyong Ding, Jun Yang
The study aims to elucidate the effects of trehalose on the mechanical, thermal, and rheological properties of wheat flour dough and water distribution in bread. Texture profile analysis, DSC, farinograph, extensograph, and frequency sweep were applied in dough. The results from SEM revealed that the gluten film became less notable with the presence of trehalose. The kinetics of staling process, low-field (1)H NMR, and water-binding capacity were employed to characterize physicochemical properties of bread...
October 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28529305/folic-acid-targeted-etoposide-cubosomes-for-theranostic-application-of-cancer-cell-imaging-and-therapy
#11
Yong Tian, Jian-Chun Li, Jin-Xiu Zhu, Na Zhu, Hong-Min Zhang, Lili Liang, Lingyi Sun
BACKGROUND The aim of this study was to develop a novel Poloxamer-based drug delivery system featuring a tumor-targeting folate moiety, which was expected to provide better targeting properties and therapeutic effects compared with the traditional cubosomes (Cubs). MATERIAL AND METHODS Both folate-modified Cubs containing etoposide (ETP-Cubs-FA) and normal cubic nanoparticles loaded with etoposide (ETP-Cubs) were prepared through the fragmentation of bulk gels under the homogenization condition of 1500 bar, and a mean particle size of around 180 nm was obtained with a narrow size distribution...
May 22, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28528947/syntrophic-association-of-termite-gut-bacterial-symbionts-with-bifunctional-characteristics-of-cellulose-degrading-and-polyhydroxyalkanoate-producing-bacteria
#12
Balasubramanian Cibichakravarthy, Subramani Abinaya, Solai Ramatchandirane Prabagaran
The guild between higher termites and their partnership with the diverse community of bacteria and archaea in their gut is a marvel evolutionary achievement. Sustained attempts were made worldwide with a quest for identifying viable important biological macromolecule polyhydroxyalkanoate (PHA) accumulating bacteria. Termite gut serve as a novel source for bacteria with dual properties like PHA production as well as cellulose degradation. Among 40 isolates cultivated, 32.5% turned positive for PCR based screening of PhaC gene...
May 18, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28528931/evaluation-of-alternative-monomers-to-hema-for-dental-applications
#13
Sven Tauscher, Jörg Angermann, Yohann Catel, Norbert Moszner
OBJECTIVE: The objective of this work is to find potential alternative monomers to 2-hydroxyethyl methacrylate (HEMA) for dental materials (self-etch adhesives and luting composites). METHODS: Monomers 1-9 were tested as potential HEMA substitutes. Methacrylates 4, 5 and 6 and (N-methyl)acrylamides 7-9 were synthesized and characterized by (1)H NMR spectroscopy. The reactivity of each monomer was studied using photo-DSC. Mixtures of monomers 1-9 with the urethane dimethacrylate UDMA (1/1: wt/wt) were formulated and cured...
May 18, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28528108/matrix-effects-on-the-crystallization-behaviour-of-butter-and-roll-in-shortening-in-laminated-bakery-products
#14
Kristin D Mattice, Alejandro G Marangoni
Two hydrogenated roll-in shortenings (A & B), one non-hydrogenated roll-in shortening and butter were used to prepare croissants. The impact of the laminated dough matrix on fat crystallization was then investigated using powder X-ray diffraction (XRD), pulsed nuclear magnetic resonance (p-NMR) and differential scanning calorimetry (DSC). The fat contained within a croissant matrix has never before been analyzed using these techniques. In each case, XRD revealed that the polymorphism of a roll-in fat will be different when baked within the dough matrix than when simply heated and cooled on its own...
June 2017: Food Research International
https://www.readbyqxmd.com/read/28528092/structural-strength-analysis-of-amorphous-trehalose-maltodextrin-systems
#15
V A Maidannyk, B Nurhadi, Y H Roos
Fundamental knowledge of physical state of materials gives practically important information for food, biological and pharmaceutical industry. Based on Williams-Landel-Ferry (WLF) equation, the strength concept was introduced. This concept provides a simple parameter, S, to express resistance of solids to flow above the glass transition temperature. To develop this approach, miscible trehalose-maltodextrin (0:100; 20:80; 40:60; 60:40; 80:20 and 100:0) systems with different ratios of components were used in the present study...
June 2017: Food Research International
https://www.readbyqxmd.com/read/28527126/polycaprolactone-based-nanoparticles-loaded-with-indomethacin-for-anti-inflammatory-therapy-from-preparation-to-ex-vivo-study
#16
Waisudin Badri, Karim Miladi, Sophie Robin, Céline Viennet, Qand Agha Nazari, Géraldine Agusti, Hatem Fessi, Abdelhamid Elaissari
PURPOSE: This work focused on the preparation of polycaprolactone based nanoparticles containing indomethacin to provide topical analgesic and anti-inflammatory effect for symptomatic treatment of inflammatory diseases. Indomethacin loaded nanoparticles are prepared for topical application to decrease indomethacin side effects and administration frequency. Oppositely to already reported works, in this research non-invasive method has been used for the enhancement of indomethacin dermal drug penetration...
May 19, 2017: Pharmaceutical Research
https://www.readbyqxmd.com/read/28526347/preparation-of-chitosan-ferulic-acid-conjugate-structure-characterization-and-in-the-application-of-pharmaceuticals
#17
Chen Li, Jian-Bin Li
A novel drug delivery system based on chitosan derivatives was prepared by introducting ferulic acid to chitosan adopting a free radical-induced grafting procedure. This paper used an ascorbic acid/hydrogen peroxide redox pair as radical initiator. The chitosan derivative was characterized by Fourier transformed infrared (FTIR), Ultraviolet-visible spectrum (UV), Differential scanning calorimetry (DSC), X-ray diffraction (XRD) and Electron microscopic scanning (SEM). What is more, preparing microcapsules with the chitosan conjugate as wall material, the drug release propertie of chitosan conjugates were compared with that of a blank chitosan, which treated in the same conditions but in the absence of ferulic acid...
May 16, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28522666/discrimination-between-glioma-grades-ii-and-iii-using-dynamic-susceptibility-perfusion-mri-a-meta-analysis
#18
Anna F Delgado, Alberto F Delgado
BACKGROUND: DSC perfusion has been evaluated in the discrimination between low-grade and high-grade glioma but the diagnostic potential to discriminate beween glioma grades II and III remains unclear. PURPOSE: Our aim was to evaluate the diagnostic accuracy of relative maximal CBV from DSC perfusion MR imaging to discriminate glioma grades II and III. DATA SOURCES: A systematic literature search was performed in PubMed/MEDLINE, Embase, Web of Science, and ClinicalTrials...
May 18, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28522428/characterization-of-new-crystalline-forms-of-hydroxyprogesterone-caproate
#19
Jeffrey Caplette, Timothy Frigo, Michael Jozwiakowski, Helene Shea, Mahmoud Mirmehrabi, Peter Müller
A systematic polymorph screening process was conducted on the steroid hydroxyprogesterone caproate, which had only one previously described orthorhombic crystalline form (A), in order to fully elucidate its solid state properties. Cooling, anti-solvent and evaporative techniques largely reproduced the same polymorph, but slurries in various solvents over two days produced a new triclinic form (B). Experiments at different temperatures in ethyl acetate or isopropyl alcohol confirmed this was an enantiotropic system with a transition temperature of approximately 30°C...
May 15, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28521996/antimicrobial-agent-free-hybrid-cationic-starch-sodium-alginate-polyelectrolyte-films-for-food-packaging-materials
#20
Ferhat Şen, İrem Uzunsoy, Emre Baştürk, Memet Vezir Kahraman
This study aimed to develop polyelectrolyte structured antimicrobial food packaging materials that do not contain any antimicrobial agents. Cationic starch was synthesized and characterized by FT-IR spectroscopy and (1)H NMR spectroscopy. Its nitrogen content was determined by Kjeldahl method. Polyelectrolyte structured antimicrobial food packaging materials were prepared using starch, cationic starch and sodium alginate. Antimicrobial activity of materials was defined by inhibition zone method (disc diffusion method)...
August 15, 2017: Carbohydrate Polymers
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