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https://www.readbyqxmd.com/read/28821158/synthesis-characterization-bioactivity-and-potential-application-of-phenolic-acid-grafted-chitosan-a-review
#1
REVIEW
Jun Liu, Huimin Pu, Shuang Liu, Juan Kan, Changhai Jin
In recent years, increasing attention has been paid to the grafting of phenolic acid onto chitosan in order to enhance the bioactivity and widen the application of chitosan. Here, we present a comprehensive overview on the recent advances of phenolic acid grafted chitosan (phenolic acid-g-chitosan) in many aspects, including the synthetic method, structural characterization, biological activity, physicochemical property and potential application. In general, four kinds of techniques including carbodiimide based coupling, enzyme catalyzed grafting, free radical mediated grafting and electrochemical methods are frequently used for the synthesis of phenolic acid-g-chitosan...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28819908/the-effect-of-cationically-modified-phosphorylcholine-polymers-on-human-osteoblasts-in-vitro-and-their-effect-on-bone-formation-in-vivo
#2
Jonathan M Lawton, Mariam Habib, Bingkui Ma, Roger A Brooks, Serena M Best, Andrew L Lewis, Neil Rushton, William Bonfield
The effect of introducing cationic charge into phosphorylcholine (PC)-based polymers has been investigated in this study with a view to using these materials as coatings to improve bone formation and osseointegration at the bone-implant interface. PC-based polymers, which have been used in a variety of medical devices to improve biocompatibility, are associated with low protein adsorption resulting in reduced complement activation, inflammatory response and cell adhesion. However, in some applications, such as orthopaedics, good integration between the implant and bone is needed to allow the distribution of loading stresses and a bioactive response is required...
August 17, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28818783/development-of-a-porous-3d-graphene-pdms-scaffold-for-improved-osseointegration
#3
Jianfeng Li, Xiao Liu, Jeremy M Crook, Gordon G Wallace
Osseointegration in orthopedic surgery plays an important role for bone implantation success. Traditional treatment of implant surface aimed at improved osseointegration has limited capability for its poor performance in supporting cell growth and proliferation. Polydimethylsiloxane (PDMS) is a widely used silicon-based organic polymer material with properties that are useful in cosmetics, domestic applications and mechanical engineering. In addition, the biocompatibility of PDMS, in part due to the high solubility of oxygen, makes it an ideal material for cell-based implants...
August 1, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28811751/bioactive-potential-of-3d-printed-oleo-gum-resin-disks-b-papyrifera-c-myrrha-and-s-benzoin-loading-nanooxides-tio2-p25-cu2o-and-moo3
#4
Diogo José Horst, Sergio Mazurek Tebcherani, Evaldo Toniolo Kubaski, Rogério de Almeida Vieira
This experimental study investigates the bioactive potential of filaments produced via hot melt extrusion (HME) and intended for fused deposition modeling (FDM) 3D printing purposes. The oleo-gum-resins from benzoin, myrrha, and olibanum in pure state and also charged with 10% of metal oxide nanoparticles, TiO2, P25, Cu2O, and MoO3, were characterized by ultraviolet-visible (UV-Vis) and Fourier transform infrared (FTIR) spectroscopy, energy-dispersive X-ray microanalysis (EDXMA), scanning electron microscopy (SEM), and differential scanning calorimetry (DSC)...
2017: Bioinorganic Chemistry and Applications
https://www.readbyqxmd.com/read/28811505/identification-and-quantification-of-plasma-free-salusin-%C3%AE-an-endogenous-parasympathomimetic-peptide
#5
Kazumi Fujimoto, Akinori Hayashi, Yoshio Kodera, Tatsuya Saito, Takuya Toki, Akifumi Ogawa, Yuji Kamata, Koji Takano, Hideki Katakami, Masayoshi Shichiri
Salusin-β is an endogenous parasympathomimetic proatherosclerotic peptide. Salusin-β was initially predicted from bioinformatic analyses and later immunologically detected in human biofluids. However, elucidation of salusin-β bioactivity has faced enormous challenges because of its unique physicochemical characteristics that cause it to strongly adhere to laboratory apparatus materials. In the strictest sense, the discovery of bioactive peptides is not complete until their exact native sequences have been confirmed in the peripheral circulation...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28809082/development-of-a-dual-functional-hydrogel-using-rgd-and-anti-vegf-aptamer
#6
Nan Zhao, Mark R Battig, Ming Xu, Xiuli Wang, Na Xiong, Yong Wang
Synthetic molecular libraries hold great potential to advance the biomaterial development. However, little effort is made to integrate molecules with molecular recognition abilities selected from different libraries into a single biomolecular material. The purpose of this work is to incorporate peptides and nucleic acid aptamers into a porous hydrogel to develop a dual-functional biomaterial. The data show that an anti-integrin peptide can promote the attachment and growth of endothelial cells in a 3D porous poly(ethylene glycol) hydrogel and an antivascular endothelial growth factor aptamer can sequester and release VEGF of high bioactivity...
August 15, 2017: Macromolecular Bioscience
https://www.readbyqxmd.com/read/28808463/micro-push-out-bond-strength-and-bioactivity-analysis-of-a-bioceramic-root-canal-sealer
#7
Ceci Nunes Carvalho, Renata Grazziotin-Soares, George Táccio de Miranda Candeiro, Luis Gallego Martinez, Juliana Pereira de Souza, Patrícia Santos Oliveira, José Bauer, Giulio Gavini
INTRODUCTION: Bioactive endodontic sealers have been developed to improve the quality of root canal obturation. EndoSequence Bioceramic (BC) Sealer is amongst calcium silicate-based materials recently developed for permanent root canal filling. The objective of this study was to evaluate the bioactivity of BC Sealer and its micro push-out bond strength to dentin compared to AH-Plus (AH) sealer. METHODS AND MATERIALS: To perform the micro push-out test, 24 root canals of mandibular premolars were instrumented and divided into two groups (n=12)...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/28807880/-broad-spectrum-bactericidal-activity-of-a-new-bioactive-grafting-material-f18-against-clinically-important-bacterial-strains
#8
M T Souza, L A Campanini, C R Chinaglia, O Peitl, E D Zanotto, C W O Souza
Infection is the most relevant surgical complication in implant or grafting procedures. Osteomyelitis and other chronic conditions pose a constant challenge in the current practice of medicine. In this context, a grafting biomaterial that possesses antibacterial properties combined with bioactivity could have great clinical impact. Researchers at the Vitreous Materials Laboratory (LaMaV-UFSCar) recently developed a glass composition, F18, which presents an improved workability range combined with high bioactivity...
August 11, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28804933/chemical-functionalization-of-polysaccharides-towards-biocompatible-hydrogels-for-biomedical-applications
#9
Andreas Kirschning, Gerald Dräger, Nick Dibbert
Hydrogels have emerged as a highly interdisciplinary topic as they play a significant role for a vast number of applications. They have been studied extensively as materials for contact lenses, wound dressing and as filler material in soft-tissue augmentation, in which classical polymer backbones such as hydroxyethylmethacrylate (HEMA) are typically employed. More recently, polysaccharides have received attention, particularly in the fields of regenerative medicine and tissue engineering, as ideal candidate materials for artificial extracellular matrices (ECM)...
August 13, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28803246/biofunctional-ionic-doped-calcium-phosphates-silk-fibroin-composites-for-bone-tissue-engineering-scaffolding
#10
S Pina, R F Canadas, G Jiménez, M Perán, J A Marchal, R L Reis, J M Oliveira
The treatment and regeneration of bone defects caused by traumatism or diseases have not been completely addressed by current therapies. Lately, advanced tools and technologies have been successfully developed for bone tissue regeneration. Functional scaffolding materials such as biopolymers and bioresorbable fillers have gained particular attention, owing to their ability to promote cell adhesion, proliferation, and extracellular matrix production, which promote new bone growth. Here, we present novel biofunctional scaffolds for bone regeneration composed of silk fibroin (SF) and β-tricalcium phosphate (β-TCP) and incorporating Sr, Zn, and Mn, which were successfully developed using salt-leaching followed by a freeze-drying technique...
August 12, 2017: Cells, Tissues, Organs
https://www.readbyqxmd.com/read/28802088/screening-bioactive-quality-control-markers-of-qishenyiqi-dripping-pills-based-on-the-relationship-between-the-ultra-high-performance-liquid-chromatography-fingerprint-and-vascular-protective-activity
#11
Limeng Zhuo, Jingjing Peng, Yunli Zhao, Dongxiang Li, Xiuman Xie, Ling Tong, Zhiguo Yu
Traditional Chinese medicine consists of complex phytochemical constituents. Selecting appropriately analytical markers of traditional Chinese medicine is a critical step in quality control. Currently, the combination of fingerprinting and efficacy evaluation is considered as a useful method for screening active ingredients in complex mixtures. This study was designed to develop an orthogonal partial least squares model for screening bioactive quality control markers of QishenYiqi dripping pills based on the fingerprint-efficacy relationship...
August 12, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28801266/lipogels-responsive-to-near-infrared-light-for-the-triggered-release-of-therapeutic-agents
#12
Francisco Martín-Saavedra, Eduardo Ruiz-Hernández, Clara Escudero-Duch, Martin Prieto, Manuel Arruebo, Negar Sadeghi, Roel Deckers, Gert Storm, Wim E Hennink, Jesús Santamaría, Nuria Vilaboa
Here we report a composite system based on fibrin hydrogels that incorporate in their structure near-infrared (NIR) responsive nanomaterials and thermosensitive liposomes (TSL). Polymerized fibrin networks entrap simultaneously gold-based nanoparticles (NPs) capable of transducing NIR photon energy into heat, and lysolipid-incorporated TSL (LTSL) loaded with doxorubicin hydrochloride (DOX). NIR irradiation of the resulting hydrogels (referred to as "lipogels") with 808 nm laser light increased the temperature of the illuminated areas, leading to the release of the liposomal cargo...
August 8, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28800528/comparison-of-three-officinal-species-of-callicarpa-based-on-a-biochemome-profiling-strategy-with-uhplc-it-ms-and-chemometrics-analysis
#13
Meng-Lu Chen, Wen-Qi Chang, Jian-Liang Zhou, Ying-Hao Yin, Wen-Rui Xia, Jian-Qun Liu, Li-Fang Liu, Gui-Zhong Xin
Traditional Chinese medicine (TCM) materials with closely related species are frequently fungible in clinical use. Therefore, holistic comparison of the composition in bioactive compounds is essential to evaluate whether they are equivalent in efficacy. Taking three officinal species of Callicarpa as a case, we proposed and validated a standardized strategy for the discrimination of closely related TCM materials, which focused on the extraction, profiling and multivariate statistical analysis of their biochemome...
August 1, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28799228/chitin-and-chitosan-biopolymers-for-wound-management
#14
Rita Singh, Kirti Shitiz, Antaryami Singh
Chitin and chitosan are biopolymers with excellent bioactive properties, such as biodegradability, non-toxicity, biocompatibility, haemostatic activity and antimicrobial activity. A wide variety of biomedical applications for chitin and chitin derivatives have been reported, including wound-healing applications. They are reported to promote rapid dermal regeneration and accelerate wound healing. A number of dressing materials based on chitin and chitosan have been developed for the treatment of wounds. Chitin and chitosan with beneficial intrinsic properties and high potential for wound healing are attractive biopolymers for wound management...
August 10, 2017: International Wound Journal
https://www.readbyqxmd.com/read/28798803/preparation-of-a-nanoemulsion-with-carapa-guianensis-aublet-meliaceae-oil-by-a-low-energy-solvent-free-method-and-evaluation-of-its-preliminary-residual-larvicidal-activity
#15
Flávia L M Jesus, Fernanda B de Almeida, Jonatas L Duarte, Anna E M F M Oliveira, Rodrigo A S Cruz, Raimundo N P Souto, Ricardo M A Ferreira, Regina Gendzelevski Kelmann, José C T Carvalho, Ana C Lira-Guedes, Marcelino Guedes, Conxita Solans, Caio P Fernandes
Andiroba (Carapa guianensis) seeds are the source of an oil with a wide range of biological activities and ethnopharmacological uses. However, few studies have devoted attention to innovative formulations, including nanoemulsions. The present study aimed to obtain a colloidal system with the andiroba oil using a low-energy and organic-solvent-free method. Moreover, the preliminary residual larvicidal activity of the nanoemulsion against Aedes aegypti was evaluated. Oleic and palmitic acids were the major fatty acids, in addition to the phytosterol β-sitosterol and limonoids (tetranortriterpenoids)...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/28797969/bioactive-mesoporous-silica-nanostructures-with-anti-microbial-and-anti-biofilm-properties
#16
Paul Cătălin Balaure, Bianca Boarca, Roxana Cristina Popescu, Diana Savu, Roxana Trusca, Bogdan Ștefan Vasile, Alexandru Mihai Grumezescu, Alina Maria Holban, Alexandra Bolocan, Ecaterina Andronescu
The increasing rate of antibiotic resistant bacteria associated with nosocomial infections in severely ill patients has urged the need for new antibacterial therapies. Nanostructured materials represent emerging innovative approaches to controlled delivery of different antimicrobial drugs. Delivery systems encapsulating natural compounds with antibacterial effects, such as essential oils have shown a great potential. Herein we report the development of SiO2 mesoporous nanosystems loaded with eucalyptus (EUC), orange (ORA), and cinnamon (CIN) essential oils...
August 7, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28797129/differential-effects-of-amnion-and-chorion-membrane-extracts-on-osteoblast-like-cells-due-to-the-different-growth-factor-composition-of-the-extracts
#17
Yoon Young Go, Sung Eun Kim, Geum Joon Cho, Sung-Won Chae, Jae-Jun Song
Human amniotic membrane extracts contain numerous growth factors and bioactive substances. However, osteogenic effects of amnion and chorion membrane extracts (AME and CME, respectively) on osteoblasts are unclear. In this study, we explored the ability of AME and CME to promote the osteogenic differentiation of osteoblast-like MG-63 cells. MG-63 cells were cultured in osteogenic induction medium (OIM) with or without exogenous AME and CME. CME enhanced the osteogenic differentiation of MG-63 cells compared with AME, as indicated by increased mineralization; alkaline phosphatase activity; and mRNA expression of osteogenic marker genes encoding integrin-binding sialoprotein (IBSP), RUNX2, OSTERIX, and osteocalcin (OCN)...
2017: PloS One
https://www.readbyqxmd.com/read/28797120/medication-eluting-devices-for-the-field-of-obgyn-medobgyn-3d-printed-biodegradable-hormone-eluting-constructs-a-proof-of-concept-study
#18
Karthik Tappa, Udayabhanu Jammalamadaka, David H Ballard, Todd Bruno, Marissa R Israel, Harika Vemula, J Mark Meacham, David K Mills, Pamela K Woodard, Jeffery A Weisman
3D printing has the potential to deliver personalized implants and devices for obstetric and gynecologic applications. The aim of this study is to engineer customizable and biodegradable 3D printed implant materials that can elute estrogen and/or progesterone. All 3D constructs were printed using polycaprolactone (PCL) biodegradable polymer laden with estrogen or progesterone and were subjected to hormone-release profile studies using ELISA kits. Material thermal properties were tested using thermogravimetric analysis and differential scanning calorimetry...
2017: PloS One
https://www.readbyqxmd.com/read/28796479/chemical-functionalization-of-plasmonic-surface-biosensors-a-tutorial-review-on-issues-strategies-and-costs
#19
Manuela Oliverio, Sara Perotto, Gabriele C Messina, Laura Lovato, Francesco De Angelis
In an ideal plasmonic surface sensor, the bioactive area, where analytes are recognized by specific biomolecules, is surrounded by an area that is generally composed of a different material. The latter, often the surface of the supporting chip, is generally hard to be selectively functionalized with respect to the active area. As results, cross talks between the active area and the surrounding one may occur. In designing a plasmonic sensor, various issues must be addressed: the specificity of analyte recognition, the orientation of the immobilized biomolecule that acts as the analyte receptor and the selectivity of surface coverage...
August 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28794848/bioactive-calcium-phosphate-based-glasses-and-ceramics-and-their-biomedical-applications-a-review
#20
Md Towhidul Islam, Reda M Felfel, Ensanya A Abou Neel, David M Grant, Ifty Ahmed, Kazi M Zakir Hossain
An overview of the formation of calcium phosphate under in vitro environment on the surface of a range of bioactive materials (e.g. from silicate, borate, and phosphate glasses, glass-ceramics, bioceramics to metals) based on recent literature is presented in this review. The mechanism of bone-like calcium phosphate (i.e. hydroxyapatite) formation and the test protocols that are either already in use or currently being investigated for the evaluation of the bioactivity of biomaterials are discussed. This review also highlights the effect of chemical composition and surface charge of materials, types of medium (e...
January 2017: Journal of Tissue Engineering
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