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https://www.readbyqxmd.com/read/28433750/nanoemulsion-based-electrolyte-triggered-in-situ-gel-for-ocular-delivery-of-acetazolamide
#1
Nadia Morsi, Magdy Ibrahim, Hanan Refai, Heba El Sorogy
In the present work the antiglaucoma drug, acetazolamide, was formulated as an ion induced nanoemulsion-based in situ gel for ocular delivery aiming a sustained drug release and an improved therapeutic efficacy. Different acetazolamide loaded nanoemulsion formulations were prepared using peanut oil, tween 80 and/or cremophor EL as surfactant in addition to transcutol P or propylene glycol as cosurfactant. Based on physicochemical characterization, the nanoemulsion formulation containing mixed surfactants and transcutol P was selected to be incorporated into ion induced in situ gelling systems composed of gellan gum alone and in combination with xanthan gum, HPMC or carbopol...
April 19, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28433185/dynamic-surface-tension-measurement-for-the-screening-of-biosurfactants-produced-by-lactobacillus-plantarum-subsp-plantarum-ptcc-1896
#2
Nafiseh Bakhshi, Sabihe Soleimanian-Zad, Mahmoud Sheikh-Zeinoddin
Currently, screening of microbial biosurfactants (BSs) is based on their equilibrium surface tension values obtained using static surface tension measurement. However, a good surfactant should not only have a low equilibrium surface tension, but its dynamic surface tension (DST) should also decrease rapidly with time. In this study, screening of BSs produced by Lactobacillus plantarum subsp. plantarum PTCC 1896 (probiotic) was performed based on their DST values measured by Wilhelmy plate tensiometry. The relationship between DST and structural and functional properties (anti-adhesive activity) of the BSs was investigated...
June 2017: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/28433004/plackett-burman-design-and-response-surface-optimization-of-medium-trace-nutrients-for-glycolipopeptide-biosurfactant-production
#3
Maurice George Ekpenyong, Sylvester Peter Antai, Atim David Asitok, Bassey Offiong Ekpo
Background: A glycolipopeptide biosurfactant produced by Pseudomonas aeruginosa strain IKW1 reduced the surface tension of fermentation broth from 71.31 to 24.62 dynes/cm at a critical micelle concentration of 20.80 mg/L. The compound proved suitable for applications in emulsion stabilization in food, as well as in cosmetic and pharmaceutical formulations. Method: In the present study, Plackett-Burman design (PBD) and response surface method (RSM) were employed to screen and optimize concentrations of trace nutrients in the fermentation medium, to increase surfactant yield...
April 23, 2017: Iranian Biomedical Journal
https://www.readbyqxmd.com/read/28432777/preparative-isoelectric-focusing-in-a-cellulose-based-separation-medium
#4
Jiří Šalplachta, Marie Horká, Karel Šlais
An improved preparative method based on isoelectric focusing of analytes in a cellulose-based separation medium is described in this study. Cellulose is suspended in an aqueous solution of simple buffers, ethylene glycol, glycerol, nonionic surfactant, and colored pI markers. Water partially evaporates during focusing run and the separation takes place in an in-situ generated layer of cellulose, which has a gel-like appearance at the end of analysis. Final positions of analytes are indicated by the positions of zones of focused pI markers...
April 22, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28430445/controlling-the-roughness-of-langmuir-blodgett-monolayers
#5
Gregory J Silverberg, Arthur A McClelland, Sarah Griesse-Nascimento, Camille Girabawe, Julian P Kadow, Lakshminarayanan Mahadevan, Chad David Vecitis
Controlling the surface roughness of thin films with nanoscale precision is of significant interest for the rational design of surface coatings. Although wrinkling and buckling of Langmuir monolayers under compression has been demonstrated for several years, there is currently no method to precisely control this behavior during compression and thereby modify the surface roughness of deposited films. Here, we combine conventional Langmuir phase analysis with a novel dynamic viscoelasticity measurement to simply and accurately observe the jamming transition of monolayers of silica spheres, graphene oxide, and surfactant...
April 21, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28430344/surfactant-assisted-synthesis-of-polyvinylpyrrolidone-hydroxyapatite-composites-as-a-bone-filler
#6
Masoumeh Meskinfam Langroudi, Masoud Giahi Saravani, Azita Nouri
BACKGROUND: Different methods have been used to prepare bone-like composites from inorganic nanoparticles embedded in polymeric matrixes to obtain the properties and structures required for bone fillers. METHODS: Bone-like nano-hydroxyapatite (nHA) was synthesized using a biomimetic method, with polyvinylpyrrolidone (PVP) as template and sodium dodecyl sulfate (SDS) as surfactant. RESULTS: The results demonstrated the formation of HA composites and showed that polymer and surfactant as the polymer capsule can be properly used to control the size, shape, morphology and dispersion of HA crystals...
April 11, 2017: Journal of Applied Biomaterials & Functional Materials
https://www.readbyqxmd.com/read/28429523/poly-cytosine-dna-as-a-high-affinity-ligand-for-inorganic-nanomaterials
#7
Chang Lu, Zhicheng Huang, Biwu Liu, Yibo Liu, Yibin Ying, Juewen Liu
Attaching DNA to nanomaterials is the basis for DNA-directed assembly, sensing, and drug delivery using such hybrid materials. Poly-cytosine (poly-C) DNA is a high affinity ligand for four types of commonly used nanomaterials, including nanocarbons (graphene oxide and single-walled carbon nanotubes), transition metal dichalcogenides (MoS2 and WS2 ), metal oxides (Fe3 O4 and ZnO), and metal nanoparticles (Au and Ag). Compared to other homo-DNA sequences, poly-C DNA has the highest affinity for the first three types of materials...
April 21, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28429293/topical-delivery-of-fenoprofen-calcium-via-elastic-nano-vesicular-spanlastics-optimization-using-experimental-design-and-in-vivo-evaluation
#8
Dalia Ali Farghaly, Ahmed A Aboelwafa, Manal Y Hamza, Magdy I Mohamed
The aim of this study was to investigate the potential of surfactant-based nanovesicular system (spanlastics) for topical delivery of fenoprofen calcium (FPCa) to eliminate its oral gastrointestinal adverse effects. FPCa-loaded spanlastics were prepared by thin film hydration (TFH) technique according to a full factorial design to investigate the influence of formulation variables on the drug entrapment efficiency (%EE), particle size (PS), deformability index (DI), and the % drug released after 24 h through the cellulose membrane (Q24h) using Design-Expert® software...
April 20, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28429270/degradation-of-streptomycin-in-aquatic-environment-kinetics-pathway-and-antibacterial-activity-analysis
#9
Yanru Shen, Wenyan Zhao, Chunling Zhang, Yujie Shan, Junxian Shi
Streptomycin used in human and veterinary medicine is released into the environment mainly through excretions. As such, its elimination in water should be investigated to control pollution. In this study, the degradation of streptomycin in water was studied, and the influence of variables, including light exposure, solution pH, temperature, ionic strength, dissolved organic matter (DOM), and coexisting surfactants, on degradation was investigated. Streptomycin degradation was consistent with the first-order model in aquatic environments...
April 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28428086/evaluation-of-garlic-oil-in-nano-emulsified-form-optimization-and-its-efficacy-in-high-fat-diet-induced-dyslipidemia-in-wistar-rats
#10
Ragavan Gokulakannan, Muralidaran Yuvashree, Sridharan Badrinathan, Nachiappa Ganesh Rajesh, Pragasam Viswanathan
Garlic oil nanoemulsion was formulated using ultrasonic emulsification and the optimized garlic oil nanoemulsion ratio (1:2) of oil: surfactant showed spherical, with tiny droplet size 24.9 ± 1.11 nm. It was observed that the prepared nanoemulsion has the zeta potential of -42.63 ± 1.58 mV and a low polydispersity index of 0.2 ± 0.09 with excellent stability. The formulation was subjected to in vivo acute and sub-acute toxicity. In acute toxicity study, single oral administration of 18.63 ml of garlic oil nanoemulsion/kg resulted in immediate mortality...
April 17, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28427886/identification-of-excipients-for-stabilizing-fiberless-adenovirus-as-biopharmaceuticals
#11
Grit Kupgan, Shyamal P Choudhari, Nicholas H Flynn, Adane Nigatu, Sravanthi Vupputuri, William D Picking, Wendy L Picking, Joshua D Ramsey
Reducing the promiscuous tropism of native adenovirus by using fiberless adenovirus is advantageous towards its use as a gene therapy vector or vaccine component. The removal of the fiber protein on native adenovirus abrogates several undesirable interactions; however, this approach decreases the particle's physical stability. In order to create stable fiberless adenovirus for pharmaceutical use, the effects of temperature and pH on the particle's stability profile must be addressed. Our results indicate that the stability of fiberless adenovirus is increased when it is stored in mildly acidic conditions around pH 6...
April 17, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28427653/thermolysis-synthesis-of-pure-phase-nio-from-novel-sonochemical-synthesized-ni-ii-nano-metal-organic-supramolecular-architecture
#12
Younes Hanifehpour, Ali Morsali, Babak Mirtamizdoust, Sang Woo Joo, Behzad Soltani
Nano-structures of a new supramolecular coordination compound of divalent nickel with the pyrazol (pzH) containing the terminal azide anions, [Ni(pzH)2(N3)2] (1), with discrete molecular architecture (DMA) in solid state was synthesized via sonochemical method. The new nanostructure was characterized by scanning electron microscopy, X-ray powder diffraction, IR, and elemental analysis. Compound 1 was structurally characterized by single crystal X-ray diffraction and the single-crystal X-ray data shows that the coordination number of Ni (II) ions is six, (NiN6), with four N-donor atoms from neutral "pzH" ligands and two N-donors from two terminal azide anions...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28427641/facile-sonochemical-synthesis-of-tellurium-and-tellurium-dioxide-nanoparticles-reducing-te-iv-to-te-via-ultrasonic-irradiation-in-methanol
#13
Fatemeh Arab, Mehdi Mousavi-Kamazani, Masoud Salavati-Niasari
In this study, tellurium (Te) nanostructures were synthesized via a facile sonochemical method by reducing TeCl4 to Te under ultrasonic irradiation in methanol. Moreover, by carrying out the reaction in an alkaline environment TeO2 nanoparticles were produced. According to our knowledge, it is the first time that without secondary reducing agent Te(4+) are reduced to Te. Also, the effects of ultrasonic power, irradiation time, solvent, and surfactant on the morphology and particle size of Te nanostructures were investigated...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28427287/downstream-protein-separation-by-surfactant-precipitation-a-review
#14
Fadzlie Wong Faizal Wong, Arbakariya B Ariff, David C Stuckey
In a conventional protein downstream processing (DSP) scheme, chromatography is the single most expensive step. Despite being highly effective, it often has a low process throughput due to its semibatch nature, sometimes with nonreproducible results and relatively complex process development. Hence, more work is required to develop alternative purification methods that are more cost-effective, but exhibiting nearly comparable performance. In recent years, surfactant precipitation has been heralded as a promising new method for primary protein recovery that meets these criteria and is a simple and cost-effective method that purifies and concentrates...
April 21, 2017: Critical Reviews in Biotechnology
https://www.readbyqxmd.com/read/28427235/catan-ionic-hybrid-lipidic-nano-carriers-for-enhanced-bioavailability-and-anti-tumor-efficacy-of-chemodrugs
#15
Bilin Liu, Dan He, Jianyong Wu, Quan Sun, Mi Zhang, Qunyou Tan, Yao Li, Jingqing Zhang
To date there has not been any report on catan-ionic hybrid lipidic nano-carriers, let alone a report on applying them to deliver insoluble anti-tumor drugs. Catan-ionic hybrid lipidic nano-carriers containing curcumin (CUR-C-HLN) inherit the merits of catan-ionic systems, hybrid lipidic systems and nano-structured carriers (the second-generation substitute of solid lipidic nano-systems). Catan-ionic surfactants increased microvesicle stabilization by producing unordered isometric clusters, enhanced absorptive amount as an inhibitor of enzyme and protein, improved tumor accumulation by cellular endocytosis and membranous fusion; hybrid lipids helped to obtain high drug content and low leakage by forming a less-organized matrix arrangement...
March 6, 2017: Oncotarget
https://www.readbyqxmd.com/read/28426809/denaturation-of-proteins-by-surfactants-studied-by-the-taylor-dispersion-analysis
#16
Aldona Jelińska, Anna Zagożdżon, Marcin Górecki, Agnieszka Wisniewska, Jadwiga Frelek, Robert Holyst
We showed that the Taylor Dispersion Analysis (TDA) is a fast and easy to use method for the study of denaturation proteins. We applied TDA to study denaturation of β-lactoglobulin, transferrin, and human insulin by anionic surfactant sodium dodecyl sulfate (SDS). A series of measurements at constant protein concentration (for transferrin was 1.9 x 10-5 M, for β- lactoglobulin was 7.6 x 10-5 M, and for insulin was 1.2 x 10-4 M) and varying SDS concentrations were carried out in the phosphate-buffered saline (PBS)...
2017: PloS One
https://www.readbyqxmd.com/read/28425716/reactions-of-n2o5-with-salty-and-surfactant-coated-glycerol-interfacial-conversion-of-br-to-br2-mediated-by-alkylammonium-cations
#17
Michael A Shaloski, Joseph R Gord, Sean Staudt, Sarah L Quinn, Timothy H Bertram, Gilbert Maker Nathanson
Gas-liquid scattering and product-yield experiments are used to investigate reactions of N2O5 with glycerol containing Br(-) and surfactant ions. N2O5 oxidizes Br(-) to Br2 for every solution tested: 2.7 M NaBr, 0.03 M tetrahexylammonium bromide (THABr), 0.03 M THABr + 0.5 M NaBr, 0.03 M THABr + 0.5 M NaCl, 0.03 M THABr + 0.01 M sodium dodecyl sulfate (SDS), and 0.01 M cetyltrimethylammonium bromide (CTABr). N2O5 also reacts with glycerol itself to produce mono- and dinitroglycerin. Surface tension measurements indicate that 0...
April 20, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28425711/influence-of-surfactants-on-sodium-chloride-crystallization-in-confinement
#18
Mohsin J Qazi, Rinse W Liefferink, Simon J Schlegel, Ellen H G Backus, Daniel Bonn, Noushine Shahidzadeh
We study the influence of different surfactants on NaCl crystallization during evaporation of aqueous salt solutions. We found that at concentrations of sodium chloride close to saturation, only the cationic surfactant CTAB and the nonionic surfactant Tween 80 remain stable. For the nonionic surfactant, the high concentration of salt does not significantly change either the critical micellar concentration (CMC) or the surface tension at the CMC; for the cationic surfactant, the CMC is reduced by roughly 2 orders of magnitude upon adding the salt...
April 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28425541/photoisomerisation-and-light-induced-morphological-switching-of-a-polyoxometalate-azobenzene-hybrid
#19
Grzegorz Markiewicz, Dawid Pakulski, Agostino Galanti, Violetta Patroniak, Artur Ciesielski, Artur R Stefankiewicz, Paolo Samorì
The functionalization of a spherical Keplerate-type polyoxometalate {Mo72V30} with a cationic azobenzene surfactant has been achieved through ionic self-assembly. The photoisomerisation reaction of this complex, which emerges in a light-triggered aggregation-disaggregation process, has been followed by (1)H NMR spectroscopy, dynamic light scattering, absorption spectroscopy and scanning electron microscopy analyses.
April 20, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28425527/synthesis-of-sapo-34-nanoaggregates-with-the-assistance-of-an-inexpensive-three-in-one-non-surfactant-organosilane
#20
Pengfei Wu, Miao Yang, Wenna Zhang, Shutao Xu, Peng Guo, Peng Tian, Zhongmin Liu
[3-Piperazinepropylmethyldimethoxysilane (PZPMS)] as a low-cost co-template, a crystal growth inhibitor, and a part of the silica source was used together with triethylamine to synthesize SAPO-34 nanoaggregates with tunable compositions. Note that the piperazinyl group of PZPMS prompts the formation of a perfect CHA structure by eliminating the CHA/AEI intergrowth, which ensures the excellent MTO catalytic performance of SAPO-34 nanoaggregates.
April 20, 2017: Chemical Communications: Chem Comm
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