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https://www.readbyqxmd.com/read/28538202/development-of-nanobiocatalysts-through-the-immobilization-of-pseudomonas-fluorescens-lipase-for-applications-in-efficient-kinetic-resolution-of-racemic-compounds
#1
Bharat P Dwivedee, Jayeeta Bhaumik, Shushil K Rai, Joydev K Laha, Uttam C Banerjee
The present work reports covalent immobilization of Pseudomonas fluorescens lipase (PFL) on functionalized multiwalled carbon nanotubes (MWCNTs) as a nanobiocatalyst (NBC). This nanobiocatalyst facilitates efficient kinetic resolution of (RS)-1-phenylethanol into (S)-1-phenylethanol [C=49.7%, eep=99.5%, ees=98.1% and E value=191.4]. The immobilized preparation (MWCNTs-PFL) showed ten-fold increase in activity, thermal stability upto 80 °C and recyclability (8 cycles). MWCNTs-PFL nanobioconjugate demonstrated better stability and enhanced activity compared to covalently immobilized PFL on other matrices (silver nanoparticles, gold nanoparticles and chitosan beads) used for the study...
May 11, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28537723/multivariate-metal-organic-frameworks-as-multifunctional-heterogeneous-asymmetric-catalysts-for-a-broad-of-sequential-reactions
#2
Qingchun Xia, Zijian Li, Chunxia Tan, Yan Liu, Wei Gong, Yong Cui
The search for versatile heterogeneous catalysts with multiple active sites for a broad of asymmetric transformations has long been of great interest, but it remains a formidable synthetic challenge. Here we demonstrate that multivariate metal-organic frameworks (MTV-MOFs) can be used as an excellent platform to engineer heterogeneous catalysts featuring multiple and cooperative active sites. An isostructural series of twofold interpenetrated MTV-MOFs that contain up to three different chiral metallosalen catalysts were constructed and used as efficient and recyclable heterogeneous catalysts for a variety of asymmetric sequential alkene epoxidation/epoxide ring-opening reactions...
May 24, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28536357/glycosylated-triterpenoids-as-endosomal-escape-enhancers-in-targeted-tumor-therapies
#3
REVIEW
Hendrik Fuchs, Nicole Niesler, Alexandra Trautner, Simko Sama, Gerold Jerz, Hossein Panjideh, Alexander Weng
Protein-based targeted toxins play an increasingly important role in targeted tumor therapies. In spite of their high intrinsic toxicity, their efficacy in animal models is low. A major reason for this is the limited entry of the toxin into the cytosol of the target cell, which is required to mediate the fatal effect. Target receptor bound and internalized toxins are mostly either recycled back to the cell surface or lysosomally degraded. This might explain why no antibody-targeted protein toxin has been approved for tumor therapeutic applications by the authorities to date although more than 500 targeted toxins have been developed within the last decades...
March 29, 2017: Biomedicines
https://www.readbyqxmd.com/read/28535886/fluorescent-nanocellulosic-hydrogels-based-on-graphene-quantum-dots-for-sensing-laccase
#4
Celia Ruiz-Palomero, Sandra Benítez-Martínez, M Laura Soriano, Miguel Valcárcel
A novel low-cost fluorimetric platform based on sulfur, nitrogen-codoped graphene quantum dots immersed into nanocellulosic hydrogels is designed and applied in detecting the laccase enzyme. Although most of methods for detecting laccase are based on their catalytic activity, which is strongly dependent on environmental parameters, we report a sensitive and selective method based on the fluorescence response of hydrogels containing graphene quantum dots (GQDs) acting as luminophore towards laccase. The easily-prepared gel matrix not only improves the fluorescence signal of GQDs by avoiding their self-quenching but also stabilizes their fluorescence signal and improves their sensitivity towards laccase...
June 29, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28534562/k-junction-structure-mediated-exponential-signal-amplification-strategy-for-microrna-detection-in-electrochemiluminescence-biosensor
#5
Xue Li, Anyi Chen, Yaqin Chai, Ruo Yuan
Based on the novel designed K-junction structure, an economic and efficient exponential signal amplification strategy with simple protocol combining hemin/G-quadruplex, a mimetic peroxidase, as a catalyzer was proposed and utilized in an electrochemiluminescence biosensor for sensitive microRNA detection. It was noteworthy that the K-junction structure was formed with guanine-rich reporter DNA and substrate DNA modified by phosphate at the 5'-terminus. Thus, the activity of the reporter DNA could be inhibited and the recognition domain for the target microRNA constructed through the K-junction structure formed...
May 23, 2017: Analyst
https://www.readbyqxmd.com/read/28528503/a-flux-enhancing-forward-osmosis-nanofiltration-integrated-treatment-system-for-the-tannery-wastewater-reclamation
#6
Parimal Pal, Sankha Chakrabortty, Jayato Nayak, Suman Senapati
Effective treatment of tannery wastewater prior to discharge to the environment as per environmental regulations remains a big challenge despite efforts to bring down the concentrations of the pollutants which are often quite high as measured in terms of chemical oxygen demand (7800 mg/L), total dissolved solids (5400 mg/L), chloride (4260 mg/L), sulphides (250 mg/L) and chromium. A pilot-scale forward osmosis and nanofiltration integrated closed loop system was developed for continuous reclamation of clean water from tannery wastewater at a rate of 52-55 L/m(2)/h at 1...
May 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28520394/in-vitro-metabolic-engineering-of-amorpha-4-11-diene-biosynthesis-at-enhanced-rate-and-specific-yield-of-production
#7
Xixian Chen, Congqiang Zhang, Ruiyang Zou, Gregory Stephanopoulos, Heng-Phon Too
In vitro metabolic engineering is an alternative approach to cell-based biosynthesis. It offers unprecedented flexibility for the study of biochemical pathways, thus providing useful information for the rational design and assembly of reaction modules. Herein, we took the advantage of in vitro metabolic engineering to initially gain insight into the regulatory network of a reconstituted amorpha-4,11-diene (AD) synthetic pathway. Guided by lin-log approximation, we rapidly identified the hitherto unrecognized inhibition of adenosine triphosphate (ATP) on both farnesyl pyrophosphate synthase (FPPS) and amorpha-4,11-diene synthase (ADS)...
May 25, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/28505575/synthesis-characterization-and-photocatalytic-properties-of-nanostructured-cofe2o4-recycled-from-spent-li-ion-batteries
#8
M N Moura, R V Barrada, J R Almeida, T F M Moreira, M A Schettino, J C C Freitas, S A D Ferreira, M F F Lelis, M B J G Freitas
In this study, cobalt (Co) was recycled from spent lithium ion batteries (LIBs) and used to synthesize cobalt ferrite (CoFe2O4-LIBs), which was applied as a catalyst for heterogeneous photo Fenton reactions that discolored methylene blue (MB) dye. The co-precipitation method was used to synthesize CoFe2O4-LIBs and CoFe2O4-R nanoparticles with spinel structures using as raw materials of the LIB cathodes and commercial reagents. X-ray diffraction (XRD) identified the formation of spinel-type CoFe2O4, which formed clusters that could be seen under scanning electron microscopy (SEM) analysis and nanometric particles seen under transmission electron microscopy (TEM)...
May 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/28504367/neuroprotective-natural-products-for-the-treatment-of-parkinson-s-disease-by-targeting-the-autophagy-lysosome-pathway-a-systematic-review
#9
REVIEW
Zi-Ying Wang, Jing-Yi Liu, Chuan-Bin Yang, Sandeep Malampati, Ying-Yu Huang, Mei-Xiang Li, Min Li, Ju-Xian Song
The autophagy-lysosome pathway (ALP) is a primary means by which damaged organelles and long-lived proteins are removed from cells and their components recycled. Impairment of the ALP has been found to be linked to the pathogenesis of Parkinson's disease (PD), a chronic neurodegenerative disorder characterized by the accumulation of protein aggregates and loss of dopaminergic neurons in the midbrain. In recent years, some active compounds derived from plants have been found to regulate the ALP and to exert neuroprotective effects in experimental models of PD, raising the possibility that autophagy enhancement may be an effective therapeutic strategy in PD treatment...
May 15, 2017: Phytotherapy Research: PTR
https://www.readbyqxmd.com/read/28501264/challenges-around-automotive-shredder-residue-production-and-disposal
#10
Ala Khodier, Karl Williams, Neil Dallison
The challenge for the automotive industry is how to ensure they adopt the circular economy when it comes to the disposal of end-of-life vehicles (ELV). According to the European Commission the UK achieved a total reuse and recovery rate of 88%. This is short of the revised ELV directive target of 95% materials recovery, which requires a minimum of 85% of materials to be recycled or reused. A significant component of the recycling process is the production of automotive shredder residue (ASR). This is currently landfilled across Europe...
May 10, 2017: Waste Management
https://www.readbyqxmd.com/read/28495999/%C3%AE-arrestin-mediated-regulation-of-the-human-ether-a-go-go-related-gene-herg-potassium-channel
#11
Matthew G Sangoi, Shawn M Lamothe, Jun Guo, Tonghua Yang, Wentao Li, Ellen G Avery, John T Fisher, Shetuan Zhang
The rapidly activating delayed rectifier K(+) channel (IKr) is encoded by the human ether-a-go-go-related gene (hERG), which is important for the repolarization of the cardiac action potential. Mutations in hERG or drugs can impair the function or decrease the expression level of hERG channels, leading to long QT syndrome (LQTS). Thus, it is important to understand hERG channel trafficking and its regulation. For this purpose, G protein-coupled receptors (GPCRs), which regulate a vast array of cellular processes, represent a useful route...
May 11, 2017: Molecular Pharmacology
https://www.readbyqxmd.com/read/28488758/engineered-humicola-insolens-cutinase-for-efficient-cellulose-acetate-deacetylation
#12
Abhijit N Shirke, Glenn L Butterfoss, Rakhi Saikia, Aditya Basu, Leonardo de Maria, Allan Svendsen, Richard A Gross
Cutinases comprise a family of esterases with broad hydrolytic activity for chain and pendant ester groups. This work aimed to identify and improve an efficient cutinase for cellulose acetate (CA) deacetylation. The development of a mild method for CA fiber surface deacetylation will result in improved surface hydrophilicity and reactivity while, when combined with cellulases, a route to the full recycling of CA to acetate and glucose. In this study, the comparative CA deacetylation activity of 4 homologous wild-type (wt) fungal cutinases from Aspergillus oryzae (AoC), Thiellavia terrestris (TtC), Fusarium solani (FsC), and Humicola insolens (HiC) was determined by analysis of CA deacetylation kinetics...
May 10, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/28488439/a-high-efficient-electrochemiluminescence-resonance-energy-transfer-system-in-one-nanostructure-its-application-for-ultrasensitive-detection-of-microrna-in-cancer-cells
#13
Zhaoyang Li, Zongfan Lin, Xiaoyu Wu, Haotian Chen, Yaqin Chai, Ruo Yuan
The electrochemiluminesce (ECL) efficiency of luminous emitter can be enhanced by the means of electrochemiluminesce resonance energy transfer (ECL-RET) with a matched donor. However, generally, the donor and acceptor pairs were separated in different independent nanostructures, experiencing the challenging issues of limited energy transfer efficiency and luminous stability. Herein, we designed novel ECL-RET model within one nanostructure containing the donor of Tris (4,4'-dicarboxylicacid-2,2'-bipyridyl) ruthenium(II) dichloride (Ru(dcbpy)32+) and the acceptor of CdSe@ZnS quantum dots (QDs) for acting as the ECL emitter (QDs-Ru(dcbpy)32+), which significantly reduced the energy loss and improved the ECL efficiency of QDs because of the short path of energy transmission...
May 10, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28487571/soft-zr-doped-tio2-nanofibrous-membranes-with-enhanced-photocatalytic-activity-for-water-purification
#14
Jun Song, Xueqin Wang, Jianhua Yan, Jianyong Yu, Gang Sun, Bin Ding
Self-standing photocatalytic membranes constructed from TiO2 nanofibers hold great promise in environmental remediation; however, challenges still remained for the poor mechanical properties of polycrystalline TiO2 nanofibers. Herein, soft Zr-doped TiO2 (TZ) nanofibrous membranes with robust mechanical properties and enhanced photocatalytic activity were fabricated via electrospinning technique. The Zr(4+) incorporation could effectively inhibit the grain growth and reduce the surface defects and breaking point of TiO2 nanofiber...
May 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28483593/the-use-of-smart-technologies-in-enabling-construction-components-reuse-a-viable-method-or-a-problem-creating-solution
#15
Eleni Iacovidou, Phil Purnell, Ming K Lim
The exploitation of Radio Frequency Identification (RFID) for tracking and archiving the properties of structural construction components could be a potentially innovative disruption for the construction sector. This is because RFID can stimulate the reuse of construction components and reduce their wastage, hence addressing sustainability issues in the construction sector. To test the plausibility of that idea, this study explores the potential pre-conditions for RFID to facilitate construction components reuse, and develops a guidance for promoting their redistribution back to the supply chain...
May 5, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28483354/future-insights-in-fungal-metabolic-engineering
#16
REVIEW
Satoshi Wakai, Takayoshi Arazoe, Chiaki Ogino, Akihiko Kondo
Filamentous fungi exhibit versatile abilities, including organic acid fermentation, protein production, and secondary metabolism, amongst others, and thus have applications in the medical and food industries. Previous genomic analyses of several filamentous fungi revealed their further potential as host microorganisms for bioproduction. Recent advancements in molecular genetics, marker recycling, and genome editing could be used to alter transformation and metabolism, based on optimized design carbolated with computer science...
April 27, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28475989/development-of-a-novel-proton-exchange-membrane-free-integrated-mfc-system-with-electric-membrane-bioreactor-and-air-contact-oxidation-bed-for-efficient-and-energy-saving-wastewater-treatment
#17
Changfei Gao, Lifen Liu, Fenglin Yang
A novel combined system integrating MFC and electric membrane bioreactor (EMBR) was developed, in which a quartz sand chamber (QSC) was used, replacing expensive proton exchange membrane (PEM). An air contact oxidation bed (ACOB) and embedded trickling filter (TF) with filled volcano rock, was designed to increase dissolved oxygen (DO) in cathodic EMBR to save aeration cost. Membrane fouling in EMBR was successful inhibited/reduced by the generated bioelectricity of the system. The combined system demonstrated superior effluent quality in removing chemical oxygen demand (>97%) and ammonia nitrogen (>93%) during the stable operation, and the phosphorus removal was about 50%...
April 25, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28475966/quantifying-pathogen-risks-associated-with-potable-reuse-a-risk-assessment-case-study-for-cryptosporidium
#18
Erfaneh Amoueyan, Sajjad Ahmad, Joseph N S Eisenberg, Brian Pecson, Daniel Gerrity
This study evaluated the reliability and equivalency of three different potable reuse paradigms: (1) surface water augmentation via de facto reuse with conventional wastewater treatment; (2) surface water augmentation via planned indirect potable reuse (IPR) with ultrafiltration, pre-ozone, biological activated carbon (BAC), and post-ozone; and (3) direct potable reuse (DPR) with ultrafiltration, ozone, BAC, and UV disinfection. A quantitative microbial risk assessment (QMRA) was performed to (1) quantify the risk of infection from Cryptosporidium oocysts; (2) compare the risks associated with different potable reuse systems under optimal and sub-optimal conditions; and (3) identify critical model/operational parameters based on sensitivity analyses...
April 19, 2017: Water Research
https://www.readbyqxmd.com/read/28475492/a-highly-selective-turn-on-fluorescent-probe-for-al3-in-aqueous-solution-based-on-quinoline-schiff-base
#19
Peng-Cheng Huang, Hao Fang, Jing-Jing Xiong, Fang-Ying Wu
A new Al3+-specific fluorescent probe NQ was designed and synthesized from 2-hydroxy-1-naphthaldehyde and 2-aminoquinoline. Upon addition of Al3+, the fluorescent intensity of NQ has a significant enhancement over other examined metal ions in aqueous solution. The result of Job's plot indicated the formation of 1:1 complex between probe and Al3+, and the possible binding mode of the system between NQ and Al3+ was clarified by IR analysis and 1H NMR titration. Moreover, other metal ions examined had little effect on the detection of Al3+...
May 5, 2017: Methods and Applications in Fluorescence
https://www.readbyqxmd.com/read/28471158/thermoresponsive-microcarriers-for-smart-release-of-hydrate-inhibitors-under-shear-flow
#20
Sang Seok Lee, Juwoon Park, Yutaek Seo, Shin-Hyun Kim
The hydrate formation in subsea pipelines can cause oil and gas well blowout. To avoid disasters, various chemical inhibitors have been developed to prevent or delay the hydrate formation and growth. Nevertheless, direct injection of the inhibitors results in environmental contamination and cross-suppression of inhibition performance in the presence of other inhibitors against corrosion and/or formation of scale, paraffin, and asphaltene. Here, we suggest a new class of microcarriers that encapsulate hydrate inhibitors at high concentration and release them on demand without active external triggering...
May 10, 2017: ACS Applied Materials & Interfaces
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