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https://www.readbyqxmd.com/read/28548818/pla-pbat-bionanocomposites-with-antimicrobial-natural-rosin-for-green-packaging
#1
Hesham Moustafa, Nadia El Kissi, Ahmed I Abou-Kandil, Mohamed S Abdel-Aziz, Alain Dufresne
The use of biodegradable polymers is of great importance nowadays in many applications. Some of the most commonly used biopolymers are polylactic acid (PLA) and poly(butylene adipate-co-terephthalate) (PBAT) due to their superior properties and availability. In this manuscript, we use a facile and green modification method of organoclay (OC) by antimicrobial natural rosin which is considered as a toxicity-free reinforcing material, thus keeping the green character of the material. It increases the interlayer spacing between the clay platelets...
May 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28538100/enzymatic-hydrolysis-of-polyester-thin-films-at-the-nanoscale-effects-of-polyester-structure-and-enzyme-active-site-accessibility
#2
Michael Thomas Zumstein, Daniela Rechsteiner, Nicolas Roduner, Veronika Perz, Doris Ribitsch, Georg M Guebitz, Hans-Peter E Kohler, Kristopher McNeill, Michael Sander
Biodegradable polyesters have a large potential to replace persistent polymers in numerous applications and to thereby reduce the accumulation of plastics in the environment. Ester hydrolysis by extracellular carboxylesterases is considered the rate-limiting step in polyester biodegradation. In this work, we systematically investigated the effects of polyester and carboxylesterase structure on the hydrolysis of nanometer-thin polyester films using a quartz-crystal microbalance with dissipation monitoring. Hydrolyzability increased with increasing polyester-chain flexibility as evidenced from differences in the hydrolysis rates and extents of aliphatic polyesters varying in the length of their dicarboxylic acid unit and of poly(butylene adipate co-terephthalate) (PBAT) polyesters varying in their terephthalate-to-adipate ratio by Rhizopus oryzae lipase and Fusarium solani cutinase...
May 24, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28520814/rs12970134-near-mc4r-is-associated-with-appetite-and-beverage-intake-in-overweight-and-obese-children-a-family-based-association-study-in-chinese-population
#3
Shuo Wang, Jieyun Song, Yide Yang, Nitesh V Chawla, Jun Ma, Haijun Wang
BACKGROUND: Recent studies indicated that eating behaviors are under genetic influence, and the melanocortin 4 receptor (MC4R) gene polymorphisms can affect the total energy intake and the consumption of fat, protein and carbohydrates. Our study aims at investigating the association of the MC4R polymorphism with appetite and food intake among Chinese children. METHODS: A family-based association study was conducted among 151 Chinese trios whose offsprings were overweight/obese children aged 9-15 years...
2017: PloS One
https://www.readbyqxmd.com/read/28494433/electrospun-ultrathin-pbat-nhap-fibers-influenced-the-in-vitro-and-in-vivo-osteogenesis-and-improved-the-mechanical-properties-of-neoformed-bone
#4
Gabriela F Santana-Melo, Bruno V M Rodrigues, Edmundo da Silva, Ritchelli Ricci, Fernanda R Marciano, Thomas J Webster, Luana M R Vasconcellos, Anderson O Lobo
Combining polyester scaffolds with synthetic nanohydroxyapatite (nHAp), which is bioactive and osteoconductive, is a plausible strategy to improve bone regeneration. Here, we propose the combination of PBAT [poly(butylene-adipate-co-terephthalate)] and synthetic nHAp (at 3 and 5wt%). PBAT is a relatively a new polymer with low crystallinity and attractive biodegradability and mechanical properties for orthopedic applications, however, with a still underexplored potential for in vivo applications. Then, we performed a careful biological in vitro and in vivo set of experiments to evaluate the influence of PBAT containing two different nHAp loads...
April 27, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28457463/effect-of-reprocessing-cycles-on-the-degradation-of-pp-pbat-thermoplastic-starch-blends
#5
Thainá A Oliveira, Rosimery R Oliveira, Renata Barbosa, Joyce B Azevedo, Tatianny S Alves
The solid waste management problems caused by the accumulation of plastics require measures to mitigate the environmental damage, and mechanical recycling of plastics is among the possible solutions. In this context, the present study aimed to evaluate the effects of mechanical recycling on the properties of a polypropylene/poly(butylene adipate co-terephthalate)-thermoplastic starch blend (PP/PBAT-Thermoplastic starch blend) when it was subjected to seven reprocessing cycles by a single-screw extruder. The observations by infrared spectroscopy indicated that the chemical structures of the blend and the polypropylene matrix did not present significant changes with the reprocessing cycles...
July 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28352895/partial-to-complete-wetting-transitions-in-immiscible-ternary-blends-with-pla-the-influence-of-interfacial-confinement
#6
Ali M Zolali, Basil D Favis
In this study it is shown that the three different intermediate phases in melt blended ternary PLA/PHBV/PBS, PLA/PBAT/PE and PLA/PE/PBAT systems all demonstrate partial wetting, but have very different wetting behaviors as a function of composition and annealing. The interfacial tension of the various components, their spreading coefficients and the contact angles of the confined partially wet droplets at the interface are examined in detail. A wetting transition from partially wet droplets to a complete layer at the interface is observed for both PHBV and PBAT by increasing the concentration and also by annealing...
April 12, 2017: Soft Matter
https://www.readbyqxmd.com/read/28252280/interfacial-shish-kebabs-lengthened-by-coupling-effect-of-in-situ-flexible-nanofibrils-and-intense-shear-flow-achieving-hierarchy-to-conquer-the-conflicts-between-strength-and-toughness-of-polylactide
#7
Sheng-Yang Zhou, Ben Niu, Xu-Long Xie, Xu Ji, Gan-Ji Zhong, Benjamin S Hsiao, Zhong-Ming Li
The challenge of hitherto elaborating a feasible pathway to overcome the conflicts between strength and toughness of polylactide (PLA) still remains among academia and industry. In the current work, a unique hierarchal structure of flexible poly(butylene adipate-co-terephthalate) (PBAT) in situ nanofibrils integrating with abundant PLA shish-kebabs as a strong building block was disclosed and expresses its capability to conquer this dilemma. Substantially simultaneous enhancement on tensile strength, impact strength, and elongation at break could be achieved up to 91...
March 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28206760/nanoengineered-eggshell-silver-tailored-copolyester-polymer-blend-film-with-antimicrobial-properties
#8
Boniface J Tiimob, Gregory Mwinyelle, Woubit Abdela, Temesgen Samuel, Shaik Jeelani, Vijaya K Rangari
In this study, the reinforcement effect of different proportions of eggshell/silver (ES-Ag) nanomaterial on the structural and antimicrobial properties of 70/30 poly(butylene-co-adipate terephthalate)/polylactic acid (PBAT/PLA) immiscible blends was investigated. The ES-Ag was synthesized using a single step ball milling process and characterized with X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). These results confirmed the existence of silver nanoparticles (Ag NPs) in the interstitial spaces of the eggshell particles...
February 27, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28056787/software-updates-in-the-illumina-hiseq-platform-affect-whole-genome-bisulfite-sequencing
#9
Hidehiro Toh, Kenjiro Shirane, Fumihito Miura, Naoki Kubo, Kenji Ichiyanagi, Katsuhiko Hayashi, Mitinori Saitou, Mikita Suyama, Takashi Ito, Hiroyuki Sasaki
BACKGROUND: Methylation of cytosine in genomic DNA is a well-characterized epigenetic modification involved in many cellular processes and diseases. Whole-genome bisulfite sequencing (WGBS), such as MethylC-seq and post-bisulfite adaptor tagging sequencing (PBAT-seq), uses the power of high-throughput DNA sequencers and provides genome-wide DNA methylation profiles at single-base resolution. However, the accuracy and consistency of WGBS outputs in relation to the operating conditions of high-throughput sequencers have not been explored...
January 5, 2017: BMC Genomics
https://www.readbyqxmd.com/read/27973831/partial-and-complete-wetting-in-ultralow-interfacial-tension-multiphase-blends-with-polylactide
#10
Ali M Zolali, Basil D Favis
The control of phase structuring in multiphase blends of polylactide (PLA) with other polymers is a viable approach to promote its broader implementation. In this article, ternary and quaternary blends of PLA with poly(butylene succinate) (PBS), poly(butylene adipate-co-terephthalate) (PBAT), and poly(3-hydroxybutyrate-co-hydroxyvalerate) (PHBV) are prepared by melt blending. The interfacial tensions between components are measured using three different techniques, and a Fourier transform infrared imaging technique is developed for the purpose of unambiguous phase identification...
December 15, 2016: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/27940546/discovery-of-polyesterases-from-moss-associated-microorganisms
#11
Christina Andrea Müller, Veronika Perz, Christoph Provasnek, Felice Quartinello, Georg M Guebitz, Gabriele Berg
The growing pollution of the environment with plastic debris is a global threat which urgently requires biotechnological solutions. Enzymatic recycling not only prevents pollution but also would allow recovery of valuable building blocks. Therefore, we explored the existence of microbial polyesterases in microbial communities associated with the Sphagnum magellanicum moss, a key species within unexploited bog ecosystems. This resulted in the identification of six novel esterases, which were isolated, cloned, and heterologously expressed in Escherichia coli The esterases were found to hydrolyze the copolyester poly(butylene adipate-co-butylene terephthalate) (PBAT) and the oligomeric model substrate bis[4-(benzoyloxy)butyl] terephthalate (BaBTaBBa)...
February 15, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/27872998/ppest-is-a-novel-pbat-degrading-polyesterase-identified-by-proteomic-screening-of-pseudomonas-pseudoalcaligenes
#12
Paal W Wallace, Karolina Haernvall, Doris Ribitsch, Sabine Zitzenbacher, Matthias Schittmayer, Georg Steinkellner, Karl Gruber, Georg M Guebitz, Ruth Birner-Gruenberger
A novel esterase, PpEst, that hydrolyses the co-aromatic-aliphatic polyester poly(1,4-butylene adipate-co-terephthalate) (PBAT) was identified by proteomic screening of the Pseudomonas pseudoalcaligenes secretome. PpEst was induced by the presence of PBAT in the growth media and had predicted arylesterase (EC 3.1.1.2) activity. PpEst showed polyesterase activity on both whole and milled PBAT film releasing terephthalic acid and 4-(4-hydroxybutoxycarbonyl)benzoic acid while end product inhibition by 4-(4-hydroxybutoxycarbonyl)benzoic acid was observed...
March 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/27770894/sepiolite-as-a-promising-nanoclay-for-nano-biocomposites-based-on-starch-and-biodegradable-polyester
#13
J B Olivato, J Marini, F Yamashita, E Pollet, M V E Grossmann, L Avérous
The effects of sepiolite addition (0, 1, 3 and 5wt%) were evaluated on dynamic-mechanical behaviour, water uptake, thermal and optical properties of thermoplastic starch (TPS)/poly (butylene adipate-co-terephthalate) (PBAT) nano-biocomposites, with different TPS/PBAT (w/w) ratios and nanofiller contents. The results highlighted the improvement of the dynamic-mechanical behaviour with the addition of sepiolite, producing high performance materials. An increase of 25°C in the Tg of TPS was recorded by DMTA analysis at sepiolite content of 5wt%...
January 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27759212/replication-of-genome-wide-association-study-gwas-susceptibility-loci-in-a-latino-bipolar-disorder-cohort
#14
Suzanne Gonzalez, Jayanta Gupta, Erika Villa, Indika Mallawaarachchi, Marco Rodriguez, Mercedes Ramirez, Juan Zavala, Regina Armas, Albana Dassori, Javier Contreras, Deborah Flores, Alvaro Jerez, Alfonso Ontiveros, Humberto Nicolini, Michael Escamilla
OBJECTIVES: Recent genome-wide association studies (GWASs) have identified numerous putative genetic polymorphisms associated with bipolar disorder (BD) and/or schizophrenia (SC). We hypothesized that a portion of these polymorphisms would also be associated with BD in the Latino American population. To identify such regions, we tested previously identified genetic variants associated with BD and/or SC and ancestral haploblocks containing these single nucleotide polymorphisms (SNPs) in a sample of Latino subjects with BD...
September 2016: Bipolar Disorders
https://www.readbyqxmd.com/read/27724793/poly-butylene-adipate-co-terephthalate-scaffolds-processing-structural-characteristics-and-cellular-responses
#15
Aysu Arslan, Soner Çakmak, Alper Cengiz, Menemşe Gümüşderelioğlu
The aliphatic-aromatic copolyester, poly(butylene adipate-co-terephthalate) (PBAT) combines good mechanical and thermal properties with biodegradation ability. However, until now, researches in its potential medical use remain limited. Only in a few studies blends of PBAT with routinely used biocompatible polymers had been prepared and investigated regarding tissue engineering applications. Therefore, in this study, we decided to determine processability of neat PBAT as a scaffold material for bone tissue by using different fabrication methods i...
October 10, 2016: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/27616049/structural-reorganization-of-cnc-in-injection-molded-cnc-pbat-materials-under-thermal-annealing
#16
Marcos Mariano, Nadia El Kissi, Alain Dufresne
Composite materials were prepared by extrusion and injection molding from polybutyrate adipate terephthalate (PBAT) and high aspect ratio cellulose nanocrystals (CNCs) extracted from capim dourado fibers. Three CNC contents were used, corresponding to 0.5, 1, and 2 times the theoretical percolation threshold. Small-amplitude oscillary shear (SAOS) experiments show that as the CNC content increases, a more elastic behavior is observed but no percolating network can form within the polymeric matrix as a result of the high shear rates involved during the injection-molding process...
October 4, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/27460100/comparison-of-sequential-therapy-and-amoxicillin-tetracycline-containing-bismuth-quadruple-therapy-for-the-first-line-eradication-of-helicobacter-pylori-a-prospective-multi-center-randomized-clinical-trial
#17
RANDOMIZED CONTROLLED TRIAL
Ju Yup Lee, Nayoung Kim, Kyung Sik Park, Hyun Jin Kim, Seon Mee Park, Gwang Ho Baik, Ki-Nam Shim, Jung Hwan Oh, Suck Chei Choi, Sung Eun Kim, Won Hee Kim, Seon-Young Park, Gwang Ha Kim, Bong Eun Lee, Yunju Jo, Su Jin Hong
BACKGROUND: The <80 % Helicobacter pylori eradication rate with sequential therapy is unsatisfactory. Modified bismuth quadruple therapy, replacing metronidazole with amoxicillin, could be promising because H. pylori resistance to tetracycline or to amoxicillin is relatively low. A 14-day modified bismuth quadruple protocol as first-line H. pylori treatment was compared with 10-day sequential therapy. METHODS: In total, 390 H. pylori-infected subjects participated in the randomized clinical trial: 10-day sequential therapy (40 mg pantoprazole plus 1 g amoxicillin twice a day for 5 days, then 40 mg pantoprazole and 500 mg clarithromycin twice a day and 500 mg metronidazole three times a day for 5 days) or 14-day modified bismuth quadruple therapy (40 mg pantoprazole, 600 mg bismuth subcitrate, 1 g tetracycline, and 1 g amoxicillin, twice a day)...
July 26, 2016: BMC Gastroenterology
https://www.readbyqxmd.com/read/27343611/facile-synthesis-of-thiol-and-alkynyl-contained-sers-reporter-molecular-and-its-usage-in-assembly-of-polydopamine-protected-bioorthogonal-sers-tag-for-live-cell-imaging
#18
Ling Zhang, Ren Zhang, Mingxia Gao, Xiangmin Zhang
A bioorthogonal Raman reporter-embedded Au-core and polydopamine-shell nanoprobe was initially designed and synthesized for live cell surface-enhanced Raman scattering (SERS) imaging in Raman-silent region. The firstly synthetic bioorthogonal Raman reporter (E)-2- ((4-(phenylethynyl) benzylidene)amino)ethanethiol (PBAT) provided intense Raman signal at 2220cm(-1) in Raman-silent region. And its synthetic method was environmentally benign, high yield and easy in operation. In addition, the hydrophobicity of PBAT led to slightly aggregation of gold nanoparticles, which enhance the SERS intensity of the nanoprobe through hot spots...
September 1, 2016: Talanta
https://www.readbyqxmd.com/read/27314249/enhancing-the-mechanical-properties-of-biodegradable-polymer-blends-using-tubular-nanoparticle-stitching-of-the-interfaces
#19
Yichen Guo, Shan He, Kai Yang, Yuan Xue, Xianghao Zuo, Yingjie Yu, Ying Liu, Chung-Chueh Chang, Miriam H Rafailovich
"Green" polymer nanocomposites were made by melt blending biodegradable poly(lactic acid) (PLA) and poly(butylene adipate-co-butylene terephthalate) (PBAT) with either montmorillonite clays (Cloisite Na(+)), halloysite nanotubes (HNTs), the resorcinol diphenyl phosphate (RDP)-coated Cloisite Na(+), and coated HNTs. A technique for measuring the work of adhesion (Wa) between nanoparticles and their matrixes was used to determine the dispersion preference of the nanoparticles in the PLA/PBAT blend system. Transmission electron microscopy (TEM) images of thin sections indicated that even though both RDP-coated nanotubes and clay platelets segregated to the interfacial regions between the two immiscible polymers, only the platelets, having the larger specific surface area, were able to reduce the PBAT domain sizes...
July 13, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/26981550/data-on-synthesis-of-oligomeric-and-polymeric-poly-butylene-adipate-co-butylene-terephthalate-model-substrates-for-the-investigation-of-enzymatic-hydrolysis
#20
Veronika Perz, Klaus Bleymaier, Carsten Sinkel, Ulf Kueper, Melanie Bonnekessel, Doris Ribitsch, Georg M Guebitz
The aliphatic-aromatic copolyester poly(butylene adipate-co-butylene terephthalate) (PBAT), also known as ecoflex, contains adipic acid, 1,4-butanediol and terephthalic acid and is proven to be compostable [1], [2], [3]). We describe here data for the synthesis and analysis of poly(butylene adipate-co-butylene terephthalate variants with different adipic acid:terephatalic acid ratios and 6 oligomeric PBAT model substrates. Data for the synthesis of the following oligomeric model substrates are described: mono(4-hydroxybutyl) terephthalate (BTa), bis(4-(hexanoyloxy)butyl) terephthalate (HaBTaBHa), bis(4-(decanoyloxy)butyl) terephthalate (DaBTaBDa), bis(4-(tetradecanoyloxy)butyl) terephthalate (TdaBTaBTda), bis(4-hydroxyhexyl) terephthalate (HTaH) and bis(4-(benzoyloxy)butyl) terephthalate (BaBTaBBa)...
June 2016: Data in Brief
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