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https://www.readbyqxmd.com/read/29793092/a-combined-ftir-and-dsc-study-on-the-bilayer-stabilising-effect-of-electrostatic-interactions-in-ion-paired-lipids
#1
Maximilian Schmid, Christian Wölk, Julia Giselbrecht, K L Andrew Chan, Richard D Harvey
Investigating lipid ion pair formation is important for understanding the mechanisms of lipid-mediated drug resistance in bacteria. 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...
May 17, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29792807/micelles-protect-intact-metallo-supramolecular-block-copolymer-complexes-from-solution-to-gas-phase-during-electrospray-ionization
#2
Kai Hung Huang, Tsung-Han Tu, Shi-Cheng Wang, Yi-Tsu Chan, Cheng-Chih Hsu
Supramolecular diblock copolymers using metal-ligand coordination can be synthesized under ambient conditions by delicate design of the end groups of the homopolymer chains. However, mass spectrometric analysis of such metallo-supramolecular copolymers is challenging. One of the reasons is the nonpolarity of the polymer chains, making it hard to disperse the complexes in electrospray ionization (ESI)-friendly environments. The other difficulty is the noncovalent nature of such copolymers, which is easily disrupted during the ionization...
May 24, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29792148/homopiperazine-derived-female-controlled-vaginal-trichomonacidal-contraceptive-an-addition-to-structure-activity-relationship
#3
B S Rahul, Bindu Saraswati, C Shiju, Gopal Gupta, Nand Lal
BACKGROUND: In our previous work, several piperazine derived bis(dialkylaminethiocarbonyl) disulfides and disulfide esters of dithiocarbamic acid have been synthesized and evaluated for their spermicidal and microbicidal efficacy. These studies have provided some promising compounds for developing a dually active vaginal microbicidal contraceptive which are under pre-clinical stage [1, 16, 17]. OBJECTIVE: The main objective of this study was to design, synthesis and biological evaluation of bis(dialkylaminethiocarbonyl) disulfides (4-15) and 2,2'-disulfanediylbis (3-(substituted- 1-yl) propane-2,1-diyl) disubstituted-1-carbodithioates (19-28) as non-surfactant molecules capable of eliminating Trichomonas vaginalis as as well as irreversibly immobilizing 100% human sperm promptly...
May 23, 2018: Medicinal Chemistry
https://www.readbyqxmd.com/read/29792096/neonatal-outcome-in-preterm-deliveries-before-34-week-gestation-the-influence-of-the-mechanism-of-labor-onset
#4
Sara Pinto, Maria Filipa Malheiro, Ana Vaz, Teresa Rodrigues, Nuno Montenegro, Hercília Guimarães
PURPOSE: To evaluate neonatal outcomes in preterm infants with less than 34 weeks after spontaneous labor, preterm premature rupture of membranes (PPROM) or iatrogenic delivery and to clarify whether the mechanism of labor onset is a risk factor for adverse short-term neonatal outcome. METHODS: We performed a retrospective case-control study, which included 266 preterm newborns with less than 34-week gestation, between 2011 and 2015. Neonatal outcomes were compared according to the mechanism of labor onset...
May 23, 2018: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/29791876/extraction-and-characterization-of-cashew-tree-anacardium-occidentale-gum-use-in-aceclofenac-dental-pastes
#5
M Saquib Hasnain, Poonam Rishishwar, Sanjay Rishishwar, Sadath Ali, Amit Kumar Nayak
In the current work, the usefulness of extracted cashew tree gum (CG) as pharmaceutical excipient in dental pastes containing AC (for the pain management in the periodontitis) was investigated. CG was extracted from crude exudate of cashew tree (Anacardium occidentale, family: Anacardiaceae) (yield 19.22%). Physicochemical characteristics like colour, odour, taste, solubility, pH and viscosity of extracted CG were estimated; the phytochemical identification tests indicated the presence of carbohydrates and mucilage within it...
May 20, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29790879/exploring-matrix-effects-and-quantifying-organic-additives-in-hydraulic-fracturing-associated-fluids-using-liquid-chromatography-electrospray-ionization-mass-spectrometry
#6
Marika Nell, Damian E Helbling
Hydraulic fracturing (HF) operations utilize millions of gallons of water amended with chemical additives including biocides, corrosion inhibitors, and surfactants. Fluids injected into the subsurface return to the surface as wastewaters, which contain a complex mixture of additives, transformation products, and geogenic chemical constituents. Quantitative analytical methods are needed to evaluate wastewater disposal alternatives or to conduct adequate exposure assessments. However, our narrow understanding of how matrix effects change the ionization efficiency of target analytes limits the quantitative analysis of polar to semi-polar HF additives by means of liquid chromatography electrospray ionization mass spectrometry (LC-ESI-MS)...
May 23, 2018: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/29790050/formulation-of-oil-in-water-emulsions-for-pesticide-applications-impact-of-surfactant-type-and-concentration-on-physical-stability
#7
Jianguo Feng, Qicheng Chen, Xuemin Wu, Seid Mahdi Jafari, David Julian McClements
Oil-in-water (O/W) emulsions can be utilized as effective pesticide delivery systems in the agricultural industry. In this study, the effects of hydrophile-lipophile balance (HLB), concentration, and location of surfactants on the formation and physical stability of O/W emulsions suitable for pesticide applications was investigated using dynamic light scattering and vertical laser profiling. A non-polar pesticide (lambda-cyhalothrin) was used as a model. The pesticide emulsion with the highest stability was obtained using a commercial non-ionic surfactant (polyoxyethylene castor oil ether, EL-20) with a required HLB value of 10...
May 22, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29789835/insights-into-the-complex-interaction-between-hydrophilic-nanoparticles-and-ionic-surfactants-at-the-liquid-air-interface
#8
Jingyu Jin, Xiaoyan Li, Jiafeng Geng, Dengwei Jing
Combinations of nanoparticles and surfactants have been widely employed in many industrial processes, i.e., boiling and condensation in heat transfer and hydraulic fracturing in shale oil and gas production, etc. However, the underlying mechanism for various phenomena resulting from the addition of nanoparticles into the surfactant solutions is still unclear. For instance, there are contradictory conclusions from the literature regarding the variations of surface tension upon the addition of nanoparticles into surfactant solutions...
May 23, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29789465/efficacy-safety-and-usability-of-remifentanil-as-premedication-for-insure-in-preterm-neonates
#9
Hadiyah Y Audil, Sara Tse, Chad Pezzano, Amy Mitchell-van Steele, Joaquim M B Pinheiro
Background : We previously reported a 67% extubation failure with INSURE (Intubation, Surfactant, Extubation) using morphine as analgosedative premedication. Remifentanil, a rapid- and short-acting narcotic, might be ideal for INSURE, but efficacy and safety data for this indication are limited. Objectives : To assess whether remifentanil premedication increases extubation success rates compared with morphine, and to evaluate remifentanil's safety and usability in a teaching hospital context. Methods : Retrospective review of remifentanil orders for premedication, at a large teaching hospital neonatal intensive care unit (NICU)...
May 22, 2018: Children
https://www.readbyqxmd.com/read/29789058/prevention-and-treatment-of-respiratory-distress-syndrome-in-preterm-neonates
#10
Christopher McPherson, Jennifer A Wambach
Respiratory distress syndrome (RDS) impacts a high proportion of preterm neonates, resulting in significant morbidity and mortality. Advances in pharmacotherapy, specifically antenatal corticosteroids and postnatal surfactant therapy, have significantly reduced the incidence and impact of neonatal RDS. Antenatal corticosteroids accelerate fetal lung maturation by increasing the activity of enzymes responsible for surfactant biosynthesis, resulting in improved lung compliance. Maternal antenatal corticosteroid treatment has improved survival of preterm neonates and lowered the incidence of brain injury...
May 1, 2018: Neonatal Network: NN
https://www.readbyqxmd.com/read/29788899/topical-nanostructured-lipid-carrier-based-hydrogel-of-mometasone-furoate-for-the-treatment-of-psoriasis
#11
Navjot Kaur, Kusha Sharma, Neena Bedi
OBJECTIVE: The aim of the present study was to develop and evaluate nanostructured lipid carrier based topical hydrogel of mometasone furoate for the treatment of psoriasis. METHODS: Drug loaded NLCs were successfully developed by microemulsion technique. Pseudo ternary phase diagrams were constructed using different combinations of surfactant and co-surfactants to study the microemulsion existence range. Different compositions were selected from the phase diagram showing maximum microemulsion region and were converted into NLCs by dilution in water (1:20)...
May 22, 2018: Pharmaceutical Nanotechnology
https://www.readbyqxmd.com/read/29788881/novel-solid-lipid-nanocarrier-of-glibenclamide-a-factorial-design-approach-with-response-surface-methodology
#12
Sonia Pandey, Payal Patel, Arti Gupta
BACKGROUND: In the present investigation a factorial design approach attempt was applied to develop the solid lipid nanoparticles (SLN) of Glibenclamide (GLB) a poorly water-soluble drug (BCS -II) used in the treatment of type 2 diabetes. OBJECTIVES: Prime objectives of this experiment are to optimize the SLN formulation of Glibenclamide and improve the therapeutic effectiveness of the developed formulation. METHODS: Glibenclamide loaded SLNs (GLB-SLN) were fabricated by High speed homogenization technique...
May 21, 2018: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/29786949/the-qsofa-score-a-simple-and-accurate-predictor-of-outcomes-in-patients-with-glyphosate-herbicide-poisoning
#13
Yongsoo Cho, Byeongjo Chun, Jeongmi Moon
This study aimed to investigate whether the quick Sequential Organ Failure Assessment (qSOFA) score at emergency department (ED) presentation can help improve the risk assessment of glyphosate-surfactant herbicide (GlySH) poisoning complications. A total of 150 patients presenting with acute glyphosate herbicide ingestion were enrolled in this retrospective observational study. The qSOFA scores at presentation, ΔqSOFA (calculated by subtracting the worst qSOFA score from 1 hr after admission from the qSOFA score at presentation), baseline characteristics, clinical courses and outcomes were collected and analysed...
May 22, 2018: Basic & Clinical Pharmacology & Toxicology
https://www.readbyqxmd.com/read/29786615/morphological-control-of-gold-nanorods-via-thermally-driven-bi-surfactant-growth-and-application-for-detection-of-heavy-metal-ions
#14
Hao Huang, Huiyi Li, Huaiyu Wang, Jia Li, Penghui Li, Qidan Chen, Yue Chen, Paul K Chu, Bo Li, Xuefeng Yu
We report a modified synthesis route of colloidal gold nanorods (AuNRs) by combining the thermal re-shaping treatment and bi-surfactant modification using hexadecyltrimethylammonium bromide (CTAB) and sodium oleate (NaOL). Aspect ratios down to 1.3 ± 0.1 can be achieved in addition to good monodispersity, uniformity, and chemical stability of the materials. Furthermore, without needing post-treatment, metal ions directly interact with the AuNRs efficiently, allowing rapid and sensitive colorimetric detection of heavy metal ions such as Pb<sup>2+</sup> and Cu<sup>2+</sup> with a low concentration down to 2...
May 22, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29785688/the-influence-of-nonionic-surfactant-adsorption-on-enzymatic-hydrolysis-of-oil-palm-fruit-bunch
#15
Jatuporn Parnthong, Suratsawadee Kungsanant, Sumaeth Chavadej
Nonionic surfactants have been utilized to improve the enzymatic hydrolysis of lignocellulosic materials. However, the role of surfactant adsorption affecting enzymatic hydrolysis has not been elaborated well. In this work, nonionic surfactants differing in their molecular structures, namely the polyoxyethylene sorbitan monooleate (Tween 80), the secondary alcohol ethoxylate (Tergitol 15-S-9), and the branched alcohol ethoxylate (Tergitol TMN-6), were studied for their effects on the enzymatic hydrolysis of palm fruit bunch (PFB)...
May 22, 2018: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/29785608/reuse-of-organobentonites-with-a-carbon-dioxide-responsive-solvent
#16
Ling-Yu Luan, Li Zhang, Li-Hong Wang
Synthesized organobentonite (SOB), montmorillonite (MMT), and commercial organobentonite (COB) were used as adsorbents for paraffin oil, a model pollutant in land-based oil spills and oil pipeline rupture. The characterization of clays was carried out with scanning electron microscopy (SEM), thermogravimetric analysis (TG), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). After adsorption, oil was separated from adsorbents with a carbon dioxide responsive solvent N,N-dimethylcyclohexylamine (DMCHA), and DMCHA was subsequently separated from paraffin oil upon CO2 bubbling instead of distillation with high energy cost...
May 22, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29783154/enhanced-removal-of-p-nitrophenol-from-aqueous-media-by-montmorillonite-clay-modified-with-a-cationic-surfactant
#17
A Dos Santos, M F Viante, D J Pochapski, A J Downs, C A P Almeida
Montmorillonite clay (MC) yields after modification of the interlamellar spacing and the chemical character of its surface by treatment with cetyltrimethylammonium bromide (CTAB) a solid product (MCCTA). This has been used as an adsorbent for the removal of p-nitrophenol (PNP) from aqueous solutions. The MCCTA samples were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), thermogravimetric analysis (TG/DTA), FT-IR spectroscopy, zeta potential measurements, X-ray diffraction (XRD), and specific surface area...
March 1, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29783129/effect-of-surfactant-assisted-sonic-pretreatment-on-liquefaction-of-fruits-and-vegetable-residue-characterization-acidogenesis-biomethane-yield-and-energy-ratio
#18
M Shanthi, J Rajesh Banu, P Sivashanmugam
The present study explored the disintegration potential of fruits and vegetable residue through sodium dodecyl sulphate (SDS) assisted sonic pretreatment (SSP). In SSP method, initially the biomass barrier (lignin) was removed using SDS at different dosage, subsequently it was sonically disintegrated. The effect of SSP were assessed based on dissolved organic release (DOR) of fruits and vegetable waste and specific energy input. SSP method achieved higher DOR rate and suspended solids reduction (26% and 16%) at optimum SDS dosage of 0...
May 15, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29782985/facile-preparation-of-recombinant-spider-eggcase-silk-spheres-via-an-hfip-on-oil-approach
#19
Jianming Chen, Jinlian Hu, Peijun Zuo, Jingyu Shi, Mo Yang
Versatile spider silk proteins have been prepared by various methods in morphology of spheres for functional applications. Inspired from natural spinning process, a facile approach for the fabrication of silk spheres is described. Distinct from the traditional emulsification method, silk spheres were assembled as rapidly as 10 s by using the HFIP-on-Oil method without any surfactants and agitation used. Notably, a series of factors, such as evaporation rate of HFIP, polarity and molecular weight of oils play central roles on the final silk morphologies...
May 18, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29782805/maintaining-supersaturation-of-nimodipine-by-pvp-with-or-without-the-presence-of-sodium-lauryl-sulfate-and-sodium-taurocholate
#20
Yipshu Pui, Yuejie Chen, Huijun Chen, Shan Wang, Chengyu Liu, Wouter Tonnis, Linc Chen, Peter Serno, Stefan Bracht, Feng Qian
Amorphous solid dispersion (ASD) is one of the most versatile supersaturating drug delivery system to improve the dissolution rate and oral bioavailability of poorly water soluble drugs. PVP based ASD formulation of nimodipine (NMD) has been marketed and effectively used in clinic for nearly 30 years, yet the mechanism by which PVP maintains the supersaturation and subsequently improves the bioavailability of NMD was rarely investigated. In this research, we first studied the molecular interactions between NMD and PVP by solution NMR using CDCl3 as the solvent, and drug-polymer Flory-Huggins interaction parameter...
May 21, 2018: Molecular Pharmaceutics
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