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Glutaraldehyde 2%

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https://www.readbyqxmd.com/read/28101961/antibody-formation-towards-porcine-tissue-in-patients-implanted-with-crosslinked-heart-valves-is-directed-to-antigenic-tissue-proteins-and-%C3%AE-gal-epitopes-and-is-reduced-in-healthy-vegetarian-subjects
#1
Ulrike Böer, Falk F R Buettner, Ariane Schridde, Melanie Klingenberg, Samir Sarikouch, Axel Haverich, Mathias Wilhelmi
BACKGROUND: Glutaraldehyde-fixed porcine heart valves (ga-pV) are one of the most frequently used substitutes for insufficient aortic and pulmonary heart valves which, however, degenerate after 10-15 years. Yet, xeno-immunogenicity of ga-pV in humans including identification of immunogens still needs to be investigated. We here determined the immunogenicity of ga-pV in patients with respect to antibody formation, identity of immunogens and potential options to reduce antibody levels. METHODS: Levels of tissue-specific and anti-αGal antibodies were determined retrospectively in patients who received ga-pV for 51 months (n=4), 25 months (n=6) or 5 months (n=4) and compared to age-matched untreated subjects (n=10) or younger subjects with or without vegetarian diet (n=12/15)...
January 18, 2017: Xenotransplantation
https://www.readbyqxmd.com/read/28099453/elimination-of-porcine-epidemic-diarrhea-virus-in-an-animal-feed-manufacturing-facility
#2
Anne R Huss, Loni L Schumacher, Roger A Cochrane, Elizabeth Poulsen, Jianfa Bai, Jason C Woodworth, Steve S Dritz, Charles R Stark, Cassandra K Jones
Porcine Epidemic Diarrhea Virus (PEDV) was the first virus of wide scale concern to be linked to possible transmission by livestock feed or ingredients. Measures to exclude pathogens, prevent cross-contamination, and actively reduce the pathogenic load of feed and ingredients are being developed. However, research thus far has focused on the role of chemicals or thermal treatment to reduce the RNA in the actual feedstuffs, and has not addressed potential residual contamination within the manufacturing facility that may lead to continuous contamination of finished feeds...
2017: PloS One
https://www.readbyqxmd.com/read/28092004/bio-based-degradation-of-emerging-endocrine-disrupting-and-dye-based-pollutants-using-cross-linked-enzyme-aggregates
#3
Muhammad Bilal, Muhammad Asgher, Hafiz M N Iqbal, Hongbo Hu, Xuehong Zhang
In this study, manganese peroxidase (MnP) from an indigenous white-rot fungus Ganoderma lucidum IBL-05 was insolubilized in the form of cross-linked enzyme aggregates (CLEAs) using various aggregating agents, i.e., acetone, ammonium sulfate, ethanol, 2-propanol, and tert-butanol, followed by glutaraldehyde (GA) cross-linking. The precipitant type, MnP, and GA concentrations affected the CLEAs activity recovery and aggregation yield. Among precipitants used, acetone appeared to be the most efficient aggregation agent, providing the highest activity recovery and aggregation yield of 31...
January 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28068870/induced-remodeling-of-porcine-tendons-to-human-anterior-cruciate-ligaments-by-%C3%AE-gal-epitope-removal-and-partial-crosslinking
#4
Kevin Robert Stone, Ann Walgenbach, Uri Galili
This review describes a novel method developed for processing porcine tendon and other ligament implants which enables in situ remodeling into autologous ligaments in humans. The method differs from methods using extracellular matrices (ECM) which provide post-operative ortho-biologic support (i.e. augmentation grafts) for healing of injured ligaments, in that the porcine bone-patellar-tendon-bone itself serves as the graft replacing ruptured anterior cruciate ligament (ACL). The method allows for gradual remodeling of porcine tendon into autologous human ACL while maintaining the biomechanical integrity...
January 9, 2017: Tissue Engineering. Part B, Reviews
https://www.readbyqxmd.com/read/28063018/analysis-of-the-variation-in-low-level-laser-energy-density-on-the-crushed-sciatic-nerves-of-rats-a-morphological-quantitative-and-morphometric-study
#5
Eduardo Keiske Mastuda Ziago, Valéria Paula Sassoli Fazan, Mamie Mizusaki Iyomasa, Luiz Gustavo Sousa, Paula Yumi Yamauchi, Eunice Aparecida da Silva, Eduardo Borie, Ramón Fuentes, Fernando José Dias
The objective of this study was to evaluate three energy densities of low-level laser therapy (LLLT, GaAlAs, 780 nm, 40 mW, 0.04 cm(2)) for the treatment of lesions to peripheral nerves using the sciatic nerve of rats injured via crushing model (15 kgf, 5.2 MPa). Thirty Wistar rats (♂, 200-250 g) were divided into five groups (n = 6): C-control, not injured, and irradiated; L0-injured nerve without irradiation; L4-injured nerve irradiated with LLLT 4 J/cm(2) (0.16 J); L10-injured nerve irradiated with LLLT 10 J/cm(2) (0...
January 7, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28044425/immediate-effects-of-diamond-burr-debridement-in-patients-with-spontaneous-chronic-corneal-epithelial-defects-light-and-electron-microscopic-evaluation
#6
Charlotte Dawson, Carolina Naranjo, Belen Sanchez-Maldonado, Georgina V Fricker, Rose N Linn-Pearl, Natalia Escanilla, Christiane Kafarnik, David J Gould, Rick F Sanchez, Marian Matas-Riera
PURPOSE: To evaluate immediate effects of diamond burr debridement (DBD) on the cornea of canine patients diagnosed with spontaneous chronic corneal epithelial defects (SCCEDs). ANIMALS STUDIED: Eight client owned dogs with SCCEDs. METHODS: Nine eyes from eight dogs with SCCEDs underwent superficial keratectomy (SK). The ulcerated area was divided into quadrants with a 300-micron restricted depth knife. Two of four quadrants underwent DBD for 40-60 s...
January 2017: Veterinary Ophthalmology
https://www.readbyqxmd.com/read/28033559/multiple-signal-amplification-strategies-for-ultrasensitive-label-free-electrochemical-immunoassay-for-carbohydrate-antigen-24-2-based-on-redox-hydrogel
#7
Zhongxue Tang, Yuanyuan Fu, Zhanfang Ma
In this work, multiple signal amplification strategies for ultrasensitive label-free electrochemical immunoassay for carbohydrate antigen 24-2 (CA242) were developed using redox sodium alginate-Pb(2+)-graphene oxide (SA-Pb(2+)-GO) hydrogel. The SA-Pb(2+)-GO hydrogel was synthesised by simply mixing SA, GO, and Pb(2+) and then implemented as a novel redox species with a strong current signal at -0.46V (vs. Ag/AgCl). After the three-dimensional and porous SA-Pb(2+)-GO hydrogel was in situ generated on a glassy carbon electrode (GCE), chitosan was adsorbed on the obtained electrode to further enrich Pb(2+)...
December 22, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28026147/development-of-a-novel-immobilization-method-by-using-microgels-to-keep-enzyme-in-hydrated-microenvironment-in-porous-hydrophobic-membranes
#8
Giuseppe Vitola, Dominic Büning, Jens Schumacher, Rosalinda Mazzei, Lidietta Giorno, Mathias Ulbricht
Using colloidal polyacrylamide (PAAm) microgels as carriers, a novel strategy for covalent immobilization of enzymes maintained in hydrated microenvironment on/in a macroporous surface-functionalized hydrophobic polyvinylidene fluoride (PVDF) membrane is developed. The PAAm microgels are synthesized by inverse miniemulsion polymerization, and first the parameters are investigated which are suited to obtain particles in the desired size range, 100-200 nm, with narrow size distribution. Amino functions are then imparted to the microgels applying the Hofmann reaction...
December 27, 2016: Macromolecular Bioscience
https://www.readbyqxmd.com/read/28011740/effects-of-glutaraldehyde-concentration-and-fixation-time-on-material-characteristics-and-calcification-of-bovine-pericardium-implications-for-the-optimal-method-of-fixation-of-autologous-pericardium-used-for-cardiovascular-surgery
#9
Cheul Lee, Hong-Gook Lim, Chang-Ha Lee, Yong Jin Kim
OBJECTIVES: Autologous pericardium, which is widely used in the field of cardiovascular surgery, is usually fixed with glutaraldehyde (GA) to improve handling and provide biomechanical stability. However, an optimal method of GA fixation of autologous pericardium is not known. The objective of this study was to evaluate the effects of GA concentration and fixation time on material characteristics and calcification of bovine pericardium. METHODS: Bovine pericardial tissues were fixed with different concentrations of GA (0...
December 22, 2016: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/27997750/bactericidal-mechanism-of-glutaraldehyde-didecyldimethylammonium-bromide-as-a-disinfectant-against-escherichia-coli
#10
Wenshu Lin, Xiao Guan, Jing Cao, Bing Niu, Qin Chen
AIMS: This study focuses on the bactericidal mechanism of the new combination disinfectant glutaraldehyde-didecyldimethylammonium bromide against Escherichia coli. METHODS AND RESULTS: E. coli were exposed to GA-DDAB, and assays for cell morphology, K(+) and Ca(2+) leakage, H(+) -ATPase activity, and DNA degradation were performed. GA-DDAB damaged the cell wall and disrupted cell membrane integrity. Leakage of K(+) and Ca(2+) increased, resulting in significantly lower intracellular concentrations within 60 minutes of treatment...
December 20, 2016: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/27987989/effects-of-pectin-structure-and-crosslinking-method-on-the-properties-of-crosslinked-pectin-nanofibers
#11
Sisi Cui, Bing Yao, Meijiao Gao, Xue Sun, Dongxia Gou, Junli Hu, Yifa Zhou, Yichun Liu
We reported crosslinking of electrospun nanofibers of three representative pectins (high-methoxylated, low-methoxylated, low-methoxylated and amidated pectin) and characterization of the crosslinked nanofibers. One mono-crosslinking strategy and two dual-crosslinking strategies were developed. Mono-crosslinking is achieved using calcium ions (Ca(2+)) to crosslink carboxylate ions in galacturonic acid residues. Dual-crosslinking is achieved using covalent crosslinking reagents glutaraldehyde (GLU) or adipic acid dihydrazide (ADH) to further crosslink hydroxyl groups or carboxylate ions after Ca(2+) crosslinking...
February 10, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/27987786/comparison-of-glutaraldehyde-and-carbodiimides-to-crosslink-tissue-engineering-scaffolds-fabricated-by-decellularized-porcine-menisci
#12
Shuang Gao, Zhiguo Yuan, Weimin Guo, Mingxue Chen, Shuyun Liu, Tingfei Xi, Quanyi Guo
The objectives of this study were to fabricate porous scaffolds using decellularized meniscus, and to explore a preferable crosslinking condition to enhance mechanical properties of scaffolds. Moreover, the microstructure, porosity, biodegradation and cytotoxicity were also evaluated. EDAC or GTA in different concentration was used to crosslink scaffolds. FTIR demonstrated functional groups change in crosslinking process. SEM photography showed that crosslinked scaffolds had blurry edges, which resulted scaffolds crosslinked by 1...
February 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27987704/novel-electrospun-nanofibers-of-modified-gelatin-tyrosine-in-cartilage-tissue-engineering
#13
Maria Agheb, Mohammad Dinari, Mohammad Rafienia, Hossein Salehi
In natural cartilage tissues, chondrocytes are linked to extracellular matrix (ECM) through cell-surface binding proteins. Surface modification of gelatin can provide a new generation of biopolymers and fibrous scaffolds with chemical, mechanical, and biological properties. In this study tyrosine protein and 1,2,3-triazole ring were utilized to functionalize gelatin without Cu catalyst. Their molecular structure was characterized by Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance spectroscopy ((1)HNMR)...
February 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27973365/fabrication-of-sulfated-nanofilter-membrane-based-on-carboxymethyl-cellulose
#14
Sima Gasemloo, Mahmoud Reza Sohrabi, Morteza Khosravi, Siavoush Dastmalchi, Parvin Gharbani
The aim of this study is to prepare sulfated carboxymethyl cellulose (SCMC) nanofilter membrane using sulfur trioxide pyridine complex (SO3/pyridine) as sulfating agent and glutaraldehyde (GA) as a crosslinking agent onto polysulfone supporting membrane. The prepared nanofilter was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, atomic force microscopy and zeta potential. To evaluate the prepared nanofilter, various amounts of SO3/Pyridine were used and efficiency of them was investigated...
December 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/27939406/safety-of-immunotherapy-with-glutaraldehyde-modified-allergen-extracts-in-children-and-adults
#15
M Guzmán-Fulgencio, R Caballero, B Lara, M Mena, M Tejera, A Sastre, J-L Subiza, E Fernández-Caldas, M Casanovas
BACKGROUND: Glutaraldehyde-modified natural allergen extracts show significant reduction in the IgE-binding capacity and proteolytic activity. This allows the administration of higher doses in a shorter period of time, and to mix different allergen extracts. OBJECTIVE: Evaluate the safety of different concentrations and mixtures of glutaraldehyde-modified allergen extracts in a large group of paediatric and adult patients undergoing specific immunotherapy treatment...
December 6, 2016: Allergologia et Immunopathologia
https://www.readbyqxmd.com/read/27913224/a-novel-cross-linked-enzyme-aggregates-cleas-of-papain-and-neutrase-production-partial-characterization-and-application
#16
Zhongqin Chen, Yanwei Wang, Wei Liu, Jingya Wang, Haixia Chen
The neutrase (EC 3.4.24.4) and papain (EC 3.4.22.2) were together immobilized ascross-linked enzyme aggregates (N-P-CLEAs) and their properties were characterized. The influence of the precipitant, cross-linking ratio of glutaraldehyde and cross-linking time were investigated. Ethanol was selected as the more efficient precipitant compared with ammonium sulfate. The proper cross-linking ratio of enzyme and glutaraldehyde was 1:5 (v/v) and the optimized cross-linking time was 4h. N-P-CLEAs showed obvious improvement in thermal stability and pH stability than the free enzyme (P<0...
February 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/27911030/acellular-endocardium-as-a-novel-biomaterial-for-the-intima-of-tissue-engineered-small-caliber-vascular-grafts
#17
Feng Wang, Xin Guan, TianYi Wu, JianOu Qiao, ZhaoQing Han, JinLong Wu, XiaoWei Yu, QingJun You
We aimed to investigate whether acellular endocardium can be used as a useful biomaterial for the intima of engineered small-caliber vascular grafts. Fresh endocardium was harvested from the swine left atrium and was decellularized by digestion with the decellularization solution of Triton X-100 and SDS containing DNase I and RNase A. Surface morphological characteristics and Young's modulus were evaluated. To analyze the effect of mechanical characteristics on cell adhesion, the decellularized endocardium was stiffened with 2...
December 2016: Artificial Organs
https://www.readbyqxmd.com/read/27896496/dalbavancin-reduces-biofilms-of-methicillin-resistant-staphylococcus-aureus-mrsa-and-methicillin-resistant-staphylococcus-epidermidis-mrse
#18
D Knafl, S Tobudic, S C Cheng, D R Bellamy, F Thalhammer
Activity of dalbavancin against methicillin-resistant Staphylococcus aureus (MRSA) and methicillin-resistant Staphylococcus epidermidis (MRSE) in biofilm was investigated and the microbicidal biofilm concentrations (MBC) were determined. Biofilms obtained from ten MRSA and ten MRSE bloodstream isolates, collected from patients in the General Hospital of Vienna between 2012 and 2015, were incubated with dalbavancin in trypticase soy broth (TSB) in serial dilution from 0.0625 mg/l to 256 mg/l using a microtiter plate biofilm model...
November 28, 2016: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/27876382/amperometric-triglyceride-bionanosensor-based-on-nanoparticles-of-lipase-glycerol-kinase-glycerol-3-phosphate-oxidase
#19
C S Pundir, V Aggarwal
The nanoparticles (NPs) aggregates of lipase from porcine pancreas, glycerol kinase (GK) from Cellulomonas sp. and glycerol-3-phosphate oxidase (GPO) from Aerococcus viridanss were prepared by desolvation and glutaraldehyde crosslinking and functionalized by cysteamine. These enzyme nanoparticles (ENPs) were characterized by transmission electron microscopy (TEM) and Fourier transform infra red (FTIR) spectroscopy. The functionalzed ENPs aggregates were co-immobilized covalently onto polycrystalline Au electrode through thiolated bond...
January 15, 2017: Analytical Biochemistry
https://www.readbyqxmd.com/read/27875928/combining-mechanical-foaming-and-thermally-induced-phase-separation-to-generate-chitosan-scaffolds-for-soft-tissue-engineering
#20
D P Biswas, P A Tran, C Tallon, A J O'Connor
In this paper, a novel foaming methodology consisting of turbulent mixing and thermally induced phase separation (TIPS) was used to generate scaffolds for tissue engineering. Air bubbles were mechanically introduced into a chitosan solution which forms the continuous polymer/liquid phase in the foam created. The air bubbles entrained in the foam act as a template for the macroporous architecture of the final scaffolds. Wet foams were crosslinked via glutaraldehyde and frozen at -20 °C to induce TIPS in order to limit film drainage, bubble coalescence and Ostwald ripening...
February 2017: Journal of Biomaterials Science. Polymer Edition
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