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https://www.readbyqxmd.com/read/28231163/gluten-free-bread-influence-of-sourdough-and-compressed-yeast-on-proofing-and-baking-properties
#1
Carola Cappa, Mara Lucisano, Andrea Raineri, Lorenzo Fongaro, Roberto Foschino, Manuela Mariotti
The use of sourdough is the oldest biotechnological process to leaven baked goods, and it represents a suitable technology to improve traditional bread texture, aroma, and shelf life. A limited number of studies concerning the use of sourdough in gluten-free (GF) breadmaking have been published in comparison to those on traditional bread. The aim of this study was to compare the properties of GF breads obtained by using a previously in-lab developed GF-sourdough (SD), compressed yeast (CY; Saccharomyces cerevisiae) or their mixture (SDCY) as leavening agents; more specifically, it aims to confirm the findings of a previous studies and to further improve (both in terms of recipe and process) the features of the resulting GF breads...
October 23, 2016: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/28231133/soybean-enriched-snacks-based-on-african-rice
#2
Mauro Marengo, Hannah F Akoto, Miriam Zanoletti, Aristodemo Carpen, Simona Buratti, Simona Benedetti, Alberto Barbiroli, Paa-Nii T Johnson, Esther O Sakyi-Dawson, Firibu K Saalia, Francesco Bonomi, Maria Ambrogina Pagani, John Manful, Stefania Iametti
Snacks were produced by extruding blends of partially-defatted soybean flour with flours from milled or parboiled African-grown rice. The interplay between composition and processing in producing snacks with a satisfactory sensory profile was addressed by e-sensing, and by molecular and rheological approaches. Soybean proteins play a main role in defining the properties of the protein network in the products. At the same content in soybean flour, use of parboiled rice flour increases the snack's hardness. Electronic nose and electronic tongue discriminated samples containing a higher amount of soybean flour from those with a lower soybean flour content...
May 20, 2016: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/28231082/rheometric-non-isothermal-gelatinization-kinetics-of-chickpea-flour-based-gluten-free-muf%C3%AF-n-batters-with-added-biopolymers
#3
María Dolores Alvarez, Francisco Javier Cuesta, Beatriz Herranz, Wenceslao Canet
An attempt was made to analyze the elastic modulus (G0) of chickpea flour (CF)-based muffin batters made with CF alone and with added biopolymers (whey protein (WP), xanthan gum (XG), inulin (INL), and their blends) in order to evaluate their suitability to be a wheat flour (WF) substitute in muffins, and to model the heat-induced gelatinization of batters under non-isothermal heating condition from 25 ◦C to 90 ◦C. A rheological approach is proposed to determine the kinetic parameters (reaction order (n), frequency factor (k0), and activation energy (Ea)) using linearly-increasing temperature...
January 2, 2017: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/28228855/a-new-class-of-organogelators-based-on-triphenylmethyl-derivatives-of-primary-alcohols-hydrophobic-interactions-alone-can-mediate-gelation
#4
Wangkhem P Singh, Rajkumar S Singh
In the present work, we have explored the use of the triphenylmethyl group, a commonly used protecting group for primary alcohols as a gelling structural component in the design of molecular gelators. We synthesized a small library of triphenylmethyl derivatives of simple primary alcohols and studied their gelation properties in different solvents. Gelation efficiency for some of the derivatives was moderate to excellent with a minimum gelation concentration ranging between 0.5-4.0% w/v and a gel-sol transition temperature range of 31-75 °C...
2017: Beilstein Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28226957/inexpensive-bone-cement-substitute-for-vertebral-cement-augmentation-training
#5
Marianne Hollensteiner, Markus Samrykit, Michael Hess, David Fuerst, Benjamin Esterer, Andreas Schrempf, Marianne Hollensteiner, Markus Samrykit, Michael Hess, David Fuerst, Benjamin Esterer, Andreas Schrempf, Benjamin Esterer, Michael Hess, Markus Samrykit, Andreas Schrempf, Marianne Hollensteiner, David Fuerst
Vertebral compression fractures are treated surgically for approximately 25 years. In percutaneous cement augmentation techniques bone cement is applied to a fractured vertebra under fluoroscopic evidence to stabilize the bone fragments. Complications due to leakage of the low viscosity bone cement are reported in 5 to 15% of all routine cases. During the intraoperative application of bone cement surgeons rely on visiohaptic feedback and hence need to be familiar with the cement's rheology properties. Therefore, training is necessary...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226720/comparison-of-viscoelastic-property-characterization-of-plastisol-phantoms-with-magnetic-resonance-elastography-and-high-frequency-rheometry
#6
P M Lefebvre, K Tse Ve Koon, E Brusseau, S Nicolle, J-F Palieme, S A Lambert, D Grenier, P M Lefebvre, K Tse Ve Koon, E Brusseau, S Nicolle, J-F Palieme, S A Lambert, D Grenier, P M Lefebvre, E Brusseau, S Nicolle, D Grenier, S A Lambert
This study aims at evaluating Magnetic Resonance Elastography (MRE) as a reliable technique for the characterization of viscoelastic properties of soft tissues. Three phantoms with different concentrations of plastisol and softener were prepared in order to mechanically mimic a broad panel of healthy and pathological soft tissues. Once placed in a MRI device, each sample was excited by a homemade external driver, inducing shear waves within the medium. The storage (G') and loss (G") moduli of each phantom were then reconstructed from MRE acquisitions over a frequency range from 300 to 1,000 Hz, by applying a 2D Helmholtz inversion algorithm...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28225592/controlling-agglomeration-of-protein-aggregates-for-structure-formation-in-liquid-oil-a-sticky-business
#7
Auke de Vries, Yuly Lopez Gomez, Bas Jansen, Erik van der Linden, Elke Scholten
Proteins are known to be effective building blocks when it comes to structure formation in aqueous environments. Recently, we have shown that submicron colloidal protein particles can also be used to provide structure to liquid oil and form so-called oleogels.1 Preventing extensive agglomeration of these submicron building blocks is a prerequisite to allow for efficient structure formation. This was achieved by applying a solvent exchange procedure to transfer the building blocks from water to oil. The aim of the current paper was to elucidate on the enhanced stability against agglomeration of heat-set whey protein isolate (WPI) aggregates in oil after applying such a solvent exchange procedure...
February 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28225285/multi-scale-modeling-of-the-effects-of-salt-and-perfume-raw-materials-on-the-rheological-properties-of-commercial-thread-like-micellar-solutions
#8
Xueming Tang, Weizhong Zou, Peter H Koenig, Shawn D McConaughy, Michael R Weaver, David Michael Eike, Michael J Schmidt, Ronald G Larson
We link micellar structures to rheological properties for two surfactant body-wash formulations at various concentrations of salts and perfume raw materials (PRMs) using molecular simulations and micellar-scale modeling as well as traditional surfactant packing arguments. The two body washes, named BW-1EO and BW-3EO, are composed of sodium lauryl ethylene glycol ether sulfate (SLEnS, where n is the average number of ethylene glycol repeat units), cocamidopropyl betaine (CAPB), ACCORD (which is a mixture of six PRMs), and NaCl salt...
February 22, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28225135/liquid-metal-enabled-microfluidics
#9
Khashayar Khoshmanesh, Shi-Yang Tang, Jiu Yang Zhu, Samira Schaefer, Arnan Mitchell, Kourosh Kalantar-Zadeh, Michael D Dickey
Several gallium-based liquid metal alloys are liquid at room temperature. As 'liquid', such alloys have a low viscosity and a high surface tension while as 'metal', they have high thermal and electrical conductivities, similar to mercury. However, unlike mercury, these liquid metal alloys have low toxicity and a negligible vapor pressure, rendering them much safer. In comparison to mercury, the distinguishing feature of these alloys is the rapid formation of a self-limiting atomically thin layer of gallium oxide over their surface when exposed to oxygen...
February 22, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28222498/creep-compliance-rheology-with-a-probe-like-cylindrical-geometry
#10
Kelly Connelly, Pooria Sharif-Kashani, Matt Farajzadeh, Jean-Pierre Hubschman, H Pirouz Kavehpour
BACKGROUND: Rheology experiments have been performed on the vitreous humor, a soft gel that rests inside of the eye, to study its viscoelastic behavior and underlying macromolecular structure. A significant challenge for experimentalists is preserving the macromolecular structure when removing vitreous from in vivo conditions. OBJECTIVE: We have developed a novel probe-like rheometer geometry that allows us to perform shear rheology experiments on the vitreous humor in situ...
February 10, 2017: Biorheology
https://www.readbyqxmd.com/read/28222100/development-of-topical-ophthalmic-in-situ-gel-forming-estradiol-delivery-system-intended-for-the-prevention-of-age-related-cataracts
#11
Udaya K Kotreka, Vicki L Davis, Moji C Adeyeye
The goal of this study was to develop and characterize an ion-activated in situ gel-forming estradiol (E2) solution eye drops intended for the prevention of age-related cataracts. Accordingly, in situ gelling eye drops were made using gellan gum as an ion-activated gel-forming polymer, polysorbate-80 as drug solubilizing agent, mannitol as tonicity agent, and combination of potassium sorbate and edetate disodium dihydrate (EDTA) as preservatives. The formulations were tested for the following characteristics: pH, clarity, osmolality, antimicrobial efficacy, rheological behavior, and in vitro drug release...
2017: PloS One
https://www.readbyqxmd.com/read/28221765/design-of-macroscopically-ordered-liquid-crystalline-hydrogel-columns-knitted-with-nanosilver-for-topical-applications
#12
Sudha Janardhanan Devaki, Reshma Lali Raveendran, Nishanth Kumar Sasidharan
Design of liquid crystalline hydrogels knitted with silver nanoparticles in macroscopic ordering are becoming subject of research interest due to their promising multifunctional applications in biomedical and opto-electronic applications. The present work describes the development of liquid crystalline Schiff-based hydrogel decorated with silver nanoparticles and demonstration of its antifungal applications. Schiff base was prepared from polyglucanaldehyde and chitosan and the former was prepared by the oxidation of amylose (polyglucopyranose) isolated from abundantly available unutilised jackfruit seed starch...
February 21, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28221760/hydrogel-nanocomposites-with-independently-tunable-rheology-and-mechanics
#13
Shimon Unterman, Lyndon F Charles, Sara E Strecker, Denis Kramarenko, Dmitry Pivovarchik, Elazer Reuven Edelman, Natalie Artzi
Hydrogels are an attractive class of biomaterials for minimally invasive local drug delivery given their injectability, tunability, high water content, and biocompatibility. Broad applicability though is challenged: relatively modest mechanical properties restricts use to soft tissues, while flow properties necessary for injectability limit implantation to dried, enclosed tissues to minimize material migration during gelation. To address these dual concerns we designed an injectable nanocomposite hydrogel based on dextran aldehyde and poly(amido amine) dendrimer doped with phyllosilicate nanoplatelet fillers...
February 21, 2017: ACS Nano
https://www.readbyqxmd.com/read/28221707/dynamic-covalent-polymer-networks-from-old-chemistry-to-modern-day-innovations
#14
REVIEW
Weike Zou, Jiante Dong, Yingwu Luo, Qian Zhao, Tao Xie
Dynamic covalent polymer networks have long been recognized. With the initial focus on the unintended impact of dynamic covalent linkages on the viscoelasticity of commercial rubbers, efforts in modern times have transitioned into designing dynamic covalent polymer networks with unique adaptive properties. Whereas self-healing and thermoset reprocessing have been the primary motivations for studying dynamic covalent polymer networks, the recent discovery of the vitrimeric rheological behavior and solid-state plasticity for this type of material have opened up new opportunities in material innovations...
February 21, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28219852/linear-correlation-between-rheological-mechanical-and-mucoadhesive-properties-of-polycarbophil-polymer-blends-for-biomedical-applications
#15
Sabrina Barbosa De Souza Ferreira, Jéssica Bassi Da Silva, Fernanda Belincanta Borghi-Pangoni, Mariana Volpato Junqueira, Marcos Luciano Bruschi
Polycarbophil is widely used in a variety of pharmaceutical formulations, mainly for their strong ability to adhere to the epithelial and mucous barriers (bio/mucoadhesion). On the other hand, its association with the thermoresponsive polymer (poloxamer 407) has been poorly explored. This work investigates the rheological, mechanical and mucoadhesive properties of polymer blends containing polycarbophil and poloxamer 407, in order to select the best formulations for biomedical and pharmaceutical applications...
February 14, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28214623/rheology-and-microstructure-of-aqueous-suspensions-of-nanocrystalline-cellulose-rods
#16
Yuan Xu, Aleks D Atrens, Jason R Stokes
HYPOTHESIS: Nanocrystalline cellulose (NCC) is a negatively charged rod-like colloid obtained from the hydrolysis of plant material. It is thus expected that NCC suspensions display a rich set of phase behaviour with salt and pH because of its anisotropic shape and electrical double layer that gives rise to liquid crystallinity and self-assembly respectively. It should thus be possible to tune the rheological properties of NCC suspensions for a wide variety of end-use applications. EXPERIMENTS: Rheology and structural analysis techniques are used to characterise surface-sulphated NCC suspensions as a function of pH, salinity (NaCl) and NCC concentration...
February 12, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28213845/topical-formulation-containing-beeswax-based-nanoparticles-improved-in-vivo-skin-barrier-function
#17
Carla Souza, Luis Alexandre Pedro de Freitas, Patrícia Maria Berardo Gonçalves Maia Campos
Lipid nanoparticles have shown many advantages for treatment/prevention of skin disorders with damaged skin barrier function. Beeswax is a favorable candidate for the development of nanosystems in the cosmetic and dermatological fields because of its advantages for the development of products for topical application. In the present study, beeswax-based nanoparticles (BNs) were prepared using the hot melt microemulsion technique and incorporated to a gel-cream formulation. The formulation was subsequently evaluated for its rheological stability and effect on stratum corneum water content (SCWC) and transepidermal water loss (TEWL) using in vivo biophysical techniques...
February 17, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28213338/a-uniaxial-cyclic-compression-method-for-characterizing-the-rheological-and-textural-behaviors-of-mechanically-dewatered-sewage-sludge
#18
Fenglin Liang, Martial Sauceau, Gilles Dusserre, Patricia Arlabosse
The mechanically dewatered sewage sludge with total solid content around 20% on a weight basis is very similar to yield stress fluid, its complex transition between solid and fluid states is not perfectly reversible and especially challenging in terms of pumping, land spreading and drying. To characterize the rheological and textural properties of highly concentrated sludge, a specific methodology based on uniaxial single and cyclic compression tests is developed. Three types of sludge samples (fresh original, fresh premixed and aged original ones) are extruded into cylinders and pressed between two parallel plates using a material testing machine...
February 7, 2017: Water Research
https://www.readbyqxmd.com/read/28212934/effects-of-basil-seed-gum-cress-seed-gum-and-quince-seed-gum-on-the-physical-textural-and-rheological-properties-of-whipped-cream
#19
Reza Farahmandfar, Maryam Asnaashari, Mohammad Reza Salahi, Tandis Khosravi Rad
This study focuses on the physical, textural and rheological properties of low fat (LF) whipped cream with 30% fat content developed with Basil seed gum (BSG), Cress seed gum (CSG) and Quince seed gum (QSG) at the concentration of 0.1 and 0.3% (w/w) and comparison with high fat (HF) whipped cream sample (55%) as control. Flow curves were analyzed using Herschel bulkey and Carreau models through a fitting procedure. The rheological investigations confirmed that all samples were shear thinning fluid exhibiting a yield stress and thixotropy properties...
February 14, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28211739/microscopic-description-of-the-granular-fluidity-field-in-nonlocal-flow-modeling
#20
Qiong Zhang, Ken Kamrin
A recent granular rheology based on an implicit "granular fluidity" field has been shown to quantitatively predict many nonlocal phenomena. However, the physical nature of the field has not been identified. Here, the granular fluidity is found to be a kinematic variable given by the velocity fluctuation and packing fraction. This is verified with many discrete element simulations, which show that the operational fluidity definition, solutions of the fluidity model, and the proposed microscopic formula all agree...
February 3, 2017: Physical Review Letters
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