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https://www.readbyqxmd.com/read/28644821/zirconium-oxocluster-polymer-hybrid-nanoparticles-prepared-by-photoactivated-miniemulsion-copolymerization
#1
Cesare Benedetti, Paraskevi Flouda, Alice Antonello, Christine Rosenauer, Francisco F Perez-Pla, Katharina Landfester, Silvia Gross, Rafael Munoz-Espi
Photoactivated free radical miniemulsion copolymerization of methyl methacrylate (MMA) and the zirconium oxocluster Zr4O2(methacrylate)12 is used as an effective and fast preparation method of polymer/inorganic hybrid nanoparticles. The oxoclusters, covalently anchored to the polymer network, act as metal-organic cross-linkers, thus improving the thermomechanical properties of the resulting hybrid nanoparticles. Benzoin carbonyl organic compounds were used as photoinitiators. The obtained materials are compared in terms of cross-linking, effectiveness of cluster incorporation, and size distribution with the analogous nanoparticles produced by using conventional thermally-induced free radical miniemulsion copolymerization...
June 23, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28640439/skin-inspired-multifunctional-autonomic-intrinsic-conductive-self-healing-hydrogels-with-pressure-sensitivity-stretchability-and-3d-printability
#2
Mohammad Ali Darabi, Ali Khosrozadeh, Rene Mbeleck, Yuqing Liu, Qiang Chang, Junzi Jiang, Jun Cai, Quan Wang, Gaoxing Luo, Malcolm Xing
The advent of conductive self-healing (CSH) hydrogels, a class of novel materials mimicking human skin, may change the trajectory of the industrial process because of their potential applications in soft robots, biomimetic prostheses, and health-monitoring systems. Here, the development of a mechanically and electrically self-healing hydrogel based on physically and chemically cross-linked networks is reported. The autonomous intrinsic self-healing of the hydrogel is attained through dynamic ionic interactions between carboxylic groups of poly(acrylic acid) and ferric ions...
June 22, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28635253/discovery-and-characterization-of-histidine-oxidation-initiated-cross-links-in-an-igg1-monoclonal-antibody
#3
Chong-Feng Xu, Rachel Chen, Linda Yi, Tim Brantley, Brad Stanley, Zoran Sosic, Li Zang
Novel cross-links between an oxidized histidine and intact histidine, lysine or cysteine were discovered and characterized from high-molecular weight (HMW) fractions of an IgG1 monoclonal antibody (mAb). The mAb HMW fractions were col-lected using preparative size-exclusion chromatography (SEC) and extensively characterized to understand the mechanism of formation of the non-reducible and covalently linked portion of the HMWs. The HMW fractions were IdeS digested, reduced and analyzed by size-exclusion chromatography coupled with mass spectrometry (SEC-MS)...
June 21, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28632385/fatigue-resistant-bioinspired-composite-from-synergistic-two-dimensional-nanocomponents
#4
Sijie Wan, Qi Zhang, Xiaohang Zhou, Dechang Li, Baohua Ji, Lei Jiang, Qunfeng Cheng
Portable and wearable electronics require much more flexible graphene-based electrode with high fatigue life, which could repeatedly bend, fold, or stretch without sacrificing its mechanical properties and electrical conductivity. Herein, a kind of ultrahigh fatigue resistant graphene-based nanocomposite via tungsten disulfide (WS2) nanosheets is synthesized by introducing a synergistic effect with covalently cross-linking inspired by the orderly layered structure and abundant interfacial interactions of nacre...
June 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28625736/use-of-bioconjugation-with-cytochrome-p450-enzymes
#5
REVIEW
Julie Ducharme, Karine Auclair
Bioconjugation, defined as chemical modification of biomolecules, is widely employed in biological and biophysical studies. It can expand functional diversity and enable applications ranging from biocatalysis, biosensing and even therapy. This review summarizes how chemical modifications of cytochrome P450 enzymes (P450s or CYPs) have contributed to improving our understanding of these enzymes. Genetic modifications of P450s have also proven very useful but are not covered in this review. Bioconjugation has served to gain structural information and investigate the mechanism of P450s via photoaffinity labeling, mechanism-based inhibition (MBI) and fluorescence studies...
June 15, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28606545/wheat-starch-carbamate-production-molecular-characterization-and-film-forming-properties
#6
Carolin Menzel, Gulaim Seisenbaeva, Peter Agback, Mikael Gällstedt, Antal Boldizar, Kristine Koch
Wheat starch carbamates of different degrees of substitution were produced in laboratory experiments and for the first time their film forming performance were investigated. The carbamation reaction between urea and starch was investigated using a factorial design. Long reaction time, 2h, and high urea content, 10 and 25%, resulted in a high degree of substitution, 0.07 and 0.15, respectively. These starch carbamates were assumed to be cross-linked and showed best film forming properties resulting in continuous and firm films...
September 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28606044/the-formation-mechanism-of-hydrogels
#7
Liyan Lu, Shiliang Yuan, Jing Wang, Yun Shen, Shuwen Deng, Luyang Xie, Qixiang Yang
Hydrogels are degradable polymeric networks, in which cross-links play a vital role in structure formation and degradation. Cross-linking is a stabilization process in polymer chemistry that leads to the multi-dimensional extension of polymeric chains, resulting in network structures. By cross-linking, hydrogels are formed into stable structures that differ from their raw materials. Generally, hydrogels can be prepared from either synthetic or natural polymers. Based on the types of cross-link junctions, hydrogels can be categorized into two groups: the chemically cross-linked and the physically cross-linked...
June 12, 2017: Current Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/28605133/cationic-nanohydrogel-particles-for-therapeutic-oligonucleotide-delivery
#8
REVIEW
Nadine Leber, Lutz Nuhn, Rudolf Zentel
Short pharmaceutical active oligonucleotides such as small interfering RNA (siRNA) or cytidine-phosphate-guanosine (CpG) are considered as powerful therapeutic alternatives, especially to medicate hard-to-treat diseases (e.g., liver fibrosis or cancer). Unfortunately, these molecules are equipped with poor pharmacokinetic properties that prevent them from translation. Well-defined nanosized carriers can provide opportunities to optimize their delivery and guide them to their site of action. Among several concepts, this Feature Article focuses on cationic nanohydrogel particles as a universal delivery system for small anionic molecules including siRNA and CpG...
June 12, 2017: Macromolecular Bioscience
https://www.readbyqxmd.com/read/28598154/3d-printable-bioactivated-nanocellulose-alginate-hydrogels
#9
Jenni Leppiniemi, Panu Lahtinen, Antti Paajanen, Riitta Mahlberg, Sini Metsä-Kortelainen, Tatu Pinomaa, Heikki Pajari, Inger Vikholm-Lundin, Pekka Pursula, Vesa P Hytönen
We describe herein a nanocellulose-alginate hydrogel suitable for 3D printing. The composition of the hydrogel was optimized based on material characterization methods and 3D printing experiments, and its behavior during the printing process was studied using computational fluid dynamics simulations. The hydrogel was biofunctionalized by the covalent coupling of an enhanced avidin protein to the cellulose nanofibrils. Ionic cross-linking of the hydrogel using calcium ions improved the performance of the material...
June 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28595135/soft-nanocomposites-of-gelatin-and-poly-3-hydroxybutyrate-nanoparticles-for-dual-drug-release
#10
Rafael A Bini, Mônica F Silva, Laudemir C Varanda, Marcelo A da Silva, Cécile A Dreiss
We developed a nanocomposite gel composed of gelatin and poly(3-hydroxybutyrate) polymeric nanoparticles (PNP) to be used as an injectable gel for the contemporaneous, dual sustained release of bioactive molecules. The hydrogel matrix was formed by a very simple process, using either the physical gelation of gelatin or the natural enzyme transglutaminase to covalently cross-link the gelatin chains in the presence of embedded PNP. Oscillatory rheological measurements showed that the addition of the PNP induced an increase in the storage modulus compared to pure gelatin gels, for both physical and chemical gels...
May 22, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28579462/enhancing-the-performance-of-starch-based-wood-adhesive-by-silane-coupling-agent-kh570
#11
Lei Chen, Yajie Wang, Zia-Ud-Din, Peng Fei, Wensi Jin, Hanguo Xiong, Zhenjiong Wang
To investigate the improved performance of silane coupling agents on starch-based wood adhesive, we prepared adhesive samples using γ-Methacryloxypropyl trimethoxy silane(KH570) as a cross-linking agent.The results found that the addition of KH570 resulted in enhanced shear strength and storage stability. The addition of KH570 also promoted the thermal stability due to increase the number of covalent bonds.Furthermore, the KH570 enhanced the shear-thinning property and weakened the pseudoplastic behavior of the adhesive...
June 1, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28578045/impact-of-laccase-on-the-colour-stability-of-structured-oil-in-water-emulsions
#12
Catherine K Y Chan, Benjamin Zeeb, David Julian McClements, Jochen Weiss
The optical properties of food emulsions play a key role in determining their perceived quality because they are the first sensory cue that many consumers receive. The purpose of the current study was to investigate the impact of a cross-linking enzyme (laccase) on the appearance of structured oil-in-water emulsions containing a lipophilic model colorant (Nile red). A layer-by-layer electrostatic deposition approach was used to prepare oil-in-water emulsions stabilized by interfacial protein-pectin complexes under acidic conditions (pH3...
July 2017: Food Research International
https://www.readbyqxmd.com/read/28553108/platinum-covalent-shell-cross-linked-micelles-designed-to-deliver-doxorubicin-for-synergistic-combination-cancer-therapy
#13
Caiying Zhu, Jingjing Xiao, Ming Tang, Hua Feng, Wulian Chen, Ming Du
The preparation of polymer therapeutics capable of controlled release of multiple chemotherapeutic drugs has remained a tough problem in synergistic combination cancer therapy. Herein, a novel dual-drug co-delivery system carrying doxorubicin (DOX) and platinum(IV) (Pt[IV]) was developed. An amphiphilic diblock copolymer, PCL-b-P(OEGMA-co-AzPMA), was synthesized and used as a nanoscale drug carrier in which DOX and Pt(IV) could be packaged together. The copolymers were shell cross-linked by Pt(IV) prodrug via a click reaction...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28549680/thiomers-impact-of-in-situ-cross-linkers-on-mucoadhesive-properties
#14
Hung Thanh Lam, Gintare Leonaviciute, Ožbej Zupančič, Andreas Bernkop-Schnürch
The aim of this study was to evaluate the impact of in situ cross-linkers on the gelling and mucoadhesive properties of thiomers. Polycarbophil-cysteine conjugate (PCP-cys) was synthesized by covalent attachment of l-cysteine to polycarbophil via amide bond formation mediated by 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride (EDAC) and N-hydroxysuccinimide (NHS) whereas in situ cross-linkers (PAA-cys-MNA) were synthesized by the same bond formation between poly(acrylic acid) (PAA) of 2.1-, 6-, and 15kDa and 2-((2-amino-2-carboxyethyl)disulfanyl)nicotinic acid (cys-MNA) used as ligand...
May 23, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28548821/turning-nonspecific-interference-into-signal-amplification-covalent-biosensing-nanoassembly-enabled-by-metal-catalyzed-cross-coupling
#15
Hao Li, Fang Wang, Shenguang Ge, Haiyun Liu, Mei Yan, Jinghua Yu
In this work, a new method of protein detection in complicated samples is proposed. This method employs probe-target recognition to induce cross-linking among the probe, the target, and the nonspecific proteins in the complicated sample as a means to convert interference into effective signal amplification. This also eliminates the necessity of multistep signal amplification in a separate solution system. On the basis of this strategy, a simple and robust assay for the activity of serum cathepsin B is established...
May 26, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28543553/enhanced-acquired-antibodies-to-a-chimeric-plasmodium-falciparum-antigen-ub05-09-is-associated-with-protective-immunity-against-malaria
#16
Dinga Jerome Nyhalah, Gamua Stanley Dobgima, Vincent PrydeKehdingha Titanji
It has been shown that covalently linking two antigens could enhance the immunogenicity of the chimeric construct. To prioritise such a chimera for malaria vaccine development it is necessary to demonstrate that naturally acquired antibodies against the chimera are associated with protection from malaria. Here we probe the ability of a chimeric construct of UB05 and UB09 antigens (UB05-09) to better differentiate between acquired immune protection and susceptibility to malaria. In a cross-sectional study, recombinant UB05-09 chimera and the constituent antigens were used to probe for specific antibodies in the plasma from children and adults resident in a malaria endemic zone, using the enzyme-linked immunosorbent assay (ELISA)...
May 24, 2017: Parasite Immunology
https://www.readbyqxmd.com/read/28537071/clmsvault-a-software-suite-for-protein-cross-linking-mass-spectrometry-data-analysis-and-visualization
#17
Mathieu Courcelles, Jasmin Coulombe-Huntington, Émilie Cossette, Anne-Claude Gingras, Pierre Thibault, Mike Tyers
Protein cross-linking mass spectrometry (CL-MS) enables the sensitive detection of protein interactions and the inference of protein complex topology. The detection of chemical cross-links between protein residues can identify intra- and interprotein contact sites or provide physical constraints for molecular modeling of protein structure. Recent innovations in cross-linker design, sample preparation, mass spectrometry, and software tools have significantly improved CL-MS approaches. Although a number of algorithms now exist for the identification of cross-linked peptides from mass spectral data, a dearth of user-friendly analysis tools represent a practical bottleneck to the broad adoption of the approach...
June 5, 2017: Journal of Proteome Research
https://www.readbyqxmd.com/read/28536018/physicochemical-and-functional-properties-of-ultrasonic-treated-tragacanth-hydrogels-cross-linked-to-lysozyme
#18
Roya Koshani, Mahmoud Aminlari
The purpose of this study was to prepare, characterize and investigate physiochemical and functional attributes of hen egg white lysozyme (LZM) cross-linked with ultrasonic-treated tragacanth (US-treated TGC) under mild Maillard reactions conditions. FT-IR spectroscopy together with OPA assay revealed that covalent attachment of LZM with TCG's. Under optimum condition (pH=8.5, 60°C, RH=79%, 8 days), only one of the free amino group of LZM was blocked by TGC whereas under the same condition, US treated-TGC's blocked about three amino groups...
May 20, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28534525/covalently-linked-dengue-virus-envelope-glycoprotein-dimers-reduce-exposure-of-the-immunodominant-fusion-loop-epitope
#19
Alexander Rouvinski, Wanwisa Dejnirattisai, Pablo Guardado-Calvo, Marie-Christine Vaney, Arvind Sharma, Stéphane Duquerroy, Piyada Supasa, Wiyada Wongwiwat, Ahmed Haouz, Giovanna Barba-Spaeth, Juthathip Mongkolsapaya, Félix A Rey, Gavin R Screaton
A problem in the search for an efficient vaccine against dengue virus is the immunodominance of the fusion loop epitope (FLE), a segment of the envelope protein E that is buried at the interface of the E dimers coating mature viral particles. Anti-FLE antibodies are broadly cross-reactive but poorly neutralizing, displaying a strong infection enhancing potential. FLE exposure takes place via dynamic 'breathing' of E dimers at the virion surface. In contrast, antibodies targeting the E dimer epitope (EDE), readily exposed at the E dimer interface over the region of the conserved fusion loop, are very potent and broadly neutralizing...
May 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28533376/b12-dependent-photoresponsive-protein-hydrogels-for-controlled-stem-cell-protein-release
#20
Ri Wang, Zhongguang Yang, Jiren Luo, I-Ming Hsing, Fei Sun
Thanks to the precise control over their structural and functional properties, genetically engineered protein-based hydrogels have emerged as a promising candidate for biomedical applications. Given the growing demand for creating stimuli-responsive "smart" hydrogels, here we show the synthesis of entirely protein-based photoresponsive hydrogels by covalently polymerizing the adenosylcobalamin (AdoB12)-dependent photoreceptor C-terminal adenosylcobalamin binding domain (CarHC) proteins using genetically encoded SpyTag-SpyCatcher chemistry under mild physiological conditions...
June 6, 2017: Proceedings of the National Academy of Sciences of the United States of America
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