Strong and biocompatible lignin /poly (3-hydroxybutyrate) composite nanofibers

In this study, we proposed lignin copolymers as mechanical reinforcement agents for PHB. A series of lignin copolymers (random and block) were synthesized via the solvent free ring-opening polymerization (ROP) of β-butyrolactone and/or ε-caprolactone onto lignin core. The lignin copolymers were characterized by nuclear magnetic resonance (NMR), gel permeation chromatography (GPC) and differential scanning calorimetry (DSC). Next, these lignin copolymers were incorporated into PHB nanofibers as reinforcement fillers, in order to improve their mechanical properties. It is found that the lignin block copolymer with poly(ε-caprolactone) (PCL) segment followed by PHB segment (LPC + H) displayed the best mechanical improvement. Tensile strength of PHB nanofibers enhanced from 1.81 MPa to 3.13 MPa, and elongation at break increased from 15% of 55%. In the reinforced system, lignin plays as a rigid core, PCL acts a rubbery layer and PHB segment forms strong bonding with fiber matrix. Moreover, PHB/lignin nanofibers were demonstrated with superior biodegradability and biocompatibility, indicating that the new nanofibrous system holds great potential for biomedical applications. Graphical abstract
Source: Composites Science and Technology - Category: Science Source Type: research

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Conclusions: Lymphomatous lumbosacral radiculoplexopathy should be considered in patients with progressive lumbosacral radicular symptoms. Magnetic resonance imaging and fluorodeoxyglucose-positron emission tomography, but not cerebrospinal fluid, are helpful in achieving early diagnosis. Treatment responses seem favorable.
Source: Journal of Clinical Neuromuscular Disease - Category: Neurology Tags: Original Article Source Type: research
Conclusions: Proper clinical conditions, for scheduling a postextraction immediate implant placement surgery, involve the presence of 4 bone walls showing and sufficient height and width. The accurate knowledge of alveolus bone morphology of mandibular molars, prior extraction, could be an important guide to avoid potential failures due to nonideal anatomical features to fixture stabilization.
Source: Implant Dentistry - Category: Dentistry Tags: Basic and Clinical Research Source Type: research
Publication date: October 2018 Source:Food Hydrocolloids, Volume 83 Author(s): Entsar S. Abdou, Gehan F. Galhoum, Entsar N. Mohamed The present study aimed to investigate the extension of chilled chicken fillets shelf life through using nanoemulsions coatings technique. Three curcumin nanoemulsions were prepared: curcumin-cinnamon essential oil nanoemulsion (CCN), curcumin-garlic essential oil nanoemulsion (CGN) and curcumin-sunflower oil nanoemulsion (CSN). Droplets size and morphology of curcumin nanoemulsions were examined by zetasizer and transmission scanning microscope (TEM), the mean droplets size was found to be 4...
Source: Food Hydrocolloids - Category: Food Science Source Type: research
Publication date: October 2018 Source:Food Hydrocolloids, Volume 83 Author(s): Jing Ai, Torsten Witt, Gary Cowin, Sushil Dhital, Mark S. Turner, Jason R. Stokes, Michael J. Gidley High-moisture rice snacks, such as steamed rice cakes, develop firmness on storage which decreases shelf life significantly. By analogy with lower moisture bread systems, this staling was hypothesised to be due to a combination of starch retrogradation and moisture re-distribution. Therefore, food additives which are commonly used to retard starch retrogradation during bread staling, including enzymes, hydrocolloids and emulsifiers (alpha-amylas...
Source: Food Hydrocolloids - Category: Food Science Source Type: research
Publication date: 1 September 2018 Source:Colloids and Surfaces B: Biointerfaces, Volume 169 Author(s): Jiuping Wu, Linlong Li, Chuan Fu, Fan Yang, Zixue Jiao, Xincui Shi, Yoshihiro Ito, Zongliang Wang, Qinyi Liu, Peibiao Zhang Polyetheretherketone (PEEK) is a high-performance semicrystalline thermoplastic polymer that is widely used in the orthopedics treatment. However, due to its biological inertness, the surface modification of PEEK using different methods to improve the biocompatibility remains a significant challenge. Herein, we attempted to use the covalently coating of phosphorylated gelatin loaded with bone morph...
Source: Colloids and Surfaces B: Biointerfaces - Category: Biochemistry Source Type: research
In this study we have used the charged amphiphiles dipalmitoylphosphatidylglycerol (DPPG) and dihexadecyldimethylammonium bromide (DHDAB), as a model to evaluate the formation of ion pairs by a combined Fourier transform infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC) analysis. FTIR was employed to study the environment of the DPPC headgroup phosphate and lipid/surfactant alkane chains, in vesicles formed by the two amphiphiles mixed in various molar ratios. An increase of the absorbance ratio of 1221–1201 cm−1 in the asymmetric phosphate stretching mode was found to follow a sigmoida...
Source: Colloids and Surfaces B: Biointerfaces - Category: Biochemistry Source Type: research
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Source: Colloids and Surfaces B: Biointerfaces - Category: Biochemistry Source Type: research
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Source: Colloids and Surfaces B: Biointerfaces - Category: Biochemistry Source Type: research
Publication date: 1 July 2018 Source:Sensors and Actuators A: Physical, Volume 277 Author(s): Nahid Chaudhary, Manika Khanuja, Abid, S.S. Islam In the present work, MoS2 nanosheets were synthesized by a hydrothermal method for optical sensing application. X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Raman and UV–vis spectroscopy were carried out to characterize the synthesized MoS2 nanosheets. SEM and TEM images showed the morphology of ultrathin nanosheets of MoS2. Optical sensor of MoS2 nanosheets was fabricated and thoroughly studied using various laser exci...
Source: Sensors and Actuators A: Physical - Category: Physics Source Type: research
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Source: International Journal of Industrial Ergonomics - Category: Occupational Health Source Type: research
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