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https://www.readbyqxmd.com/read/29331861/synthesis-of-colloidal-silver-nanoparticle-clusters-and-their-application-in-ascorbic-acid-detection-by-sers
#1
Jorge L Cholula-Díaz, Diana Lomelí-Marroquín, Bidhan Pramanick, Alfonso Nieto-Argüello, Luis A Cantú-Castillo, Hyundoo Hwang
Ascorbic acid (vitamin C) has an essential role in the human body mainly due to its antioxidant function. In this work, metallic silver nanoparticle (AgNP) colloids were used in SERS experiments to detect ascorbic acid in aqueous solution. The AgNPs were synthesized by a green method using potato starch as reducing and stabilizing agent, and water as the solvent. The optical properties of the yellowish as-synthesized silver colloids were characterized by UV-vis spectroscopy, in which besides a typical band at 410 nm related to the localized surface plasmon resonance of the silver nanoparticles, a shoulder band around 500 nm, due to silver nanoparticle cluster formation, is presented when relatively higher concentrations of starch are used in the synthesis...
December 29, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29315987/compatibility-of-common-iv-drugs-with-6-hydroxyethyl-starch-130-0-42-and-4-gelatin
#2
Sebastian Heiderich, Anna Auf der Springe, Jonas Jürgens, Wolfgang Koppert, Andreas Leffler, Robert Sümpelmann, Nils Dennhardt
BACKGROUND: Acetate-containing colloid infusion solutions are recommended to recover normovolemia during pediatric anesthesia. Until now, no studies investigating the compatibility with common anesthetic drugs were available. AIMS: This in vitro study was conducted to reveal possible incompatibilities between common anesthetic drugs and the acetate-containing colloid infusion solutions 6% hydroxyethyl starch and 4% gelatin with normal saline as control. METHODS: The colloid infusion solutions were mixed 1:1 with 29 common intravenous drugs in concentrations used in daily clinical practice...
January 9, 2018: Paediatric Anaesthesia
https://www.readbyqxmd.com/read/29315469/changes-in-colloid-solution-sales-in-nordic-countries
#3
U E Kongsgaard, A Holtan, A Perner
BACKGROUND: Administration of resuscitation fluid is a common intervention in the treatment of critically ill patients, but the right choice of fluid is still a matter of debate. Changes in medical practice are based on new evidence and guidelines as well as traditions and personal preferences. Official warnings against the use of hydroxyl-ethyl-starch (HES) solutions have been issued. Nordic guidelines have issued several strong recommendations favouring crystalloids over colloids in all patient groups...
January 7, 2018: Acta Anaesthesiologica Scandinavica
https://www.readbyqxmd.com/read/29289030/structural-microrheological-and-kinetic-properties-of-a-ternary-silica-pluronic-f127-starch-thermosensitive-system
#4
Yana Petkova-Olsson, Claude Oelschlaeger, Henrik Ullsten, Lars Järnström
HYPOTHESIS: The sol-gel transition in aqueous suspensions consisting of silica particles and thermosensitive polymer is controlled by inter-particle forces and solution properties of the polymer. Addition of a second non-thermosensitive polymer may affect the transition. The purpose of this work was to characterize the kinetics of the sol-gel transition and to understand the effects of a second non-thermosensitive polymer on the microstructure, using a combination of classical rheology and microrheology...
December 19, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29279106/proton-nmr-relaxometry-as-probe-of-gelatinization-plasticization-and-montmorillonite-loading-effects-on-starch-based-materials
#5
Roberto Pinto Cucinelli Neto, Elton Jorge da Rocha Rodrigues, Maria Inês Bruno Tavares
The effects of granule disruption, the addition of glycerol and montmorillonite on the granule structure of corn starch were investigated by proton NMR relaxation, through the T2*, T1 and T1ρ relaxation times. Films containing 0%, 1%, 5% and 7%(w/w) of clay were prepared by solution casting and the relaxometry data were compared with those gleaned from WAXD, TGA and SEM techniques. Starch gelatinization without glycerol or clay results in an amorphous and rigid film having a dipole coupling higher than that observed for the granule...
February 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29237390/chronopharmacokinetic-evaluation-of-budesonide-multiparticulate-systems
#6
Sowjanya Battu, Prasanna Raju Yalavarthi, G V Subbareddy, Uma Maheswara Rao, Jyothshna Devi Katamreddy, Harini Cowdary Vadlamudi
Poor oral absorption of budesonide limits design of its solid oral dosage form. With this context, multiparticulate pulsatile system of budesonide for chronotherapy of nocturnal asthma was aimed in this study. Initially, solid dispersions of budesonide (BD) using sodium starch glycolate (SSG) and guar gum (GG) were developed and characterized. Uniform sized non-pariel seeds (~400 µm) were coated with solid dispersions to obtain immediate (BMP) and controlled release pellets by solution layering technique. Pulsatile drug release pellets (BMPP) were obtained by coating the controlled release pellets with Eudragit L100 and RS 100...
December 12, 2017: Recent Patents on Drug Delivery & Formulation
https://www.readbyqxmd.com/read/29221978/influence-of-6-hydroxyethyl-starch-130-0-4-versus-crystalloid-solution-on-structural-renal-damage-markers-after-coronary-artery-bypass-grafting-a-post-hoc-subgroup-analysis-of-a-prospective-trial
#7
Thomas Datzmann, Markus Hoenicka, Helmut Reinelt, Andreas Liebold, Hagen Gorki
OBJECTIVE: The restriction of hydroxyethyl starch (HES) has mandated changes in volume management based on data of critically ill patients. Reliable data of structural renal damage after HES treatment in cardiac surgical patients are lacking. The influence of 6% HES 130/0.4 was investigated in this study. DESIGN: An exploratory post hoc subgroup analysis of a prospective trial was performed. SETTING: The study was carried out at a university hospital...
May 25, 2017: Journal of Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/29199540/is-the-use-of-hydroxyethyl-starch-as-priming-solution-during-cardiac-surgery-advisable-a-randomized-single-center-trial
#8
Øyvind S Svendsen, Marit Farstad, Arve Mongstad, Rune Haaverstad, Paul Husby, Venny L Kvalheim
INTRODUCTION: The use of cardiopulmonary bypass (CPB) leads to increased fluid filtration and edema. The use of artificial colloids to counteract fluid extravasation during cardiac surgery is controversial. Beneficial effects on global fluid loading, leading to better cardiac performance and hemodynamics, have been claimed. However, renal function and coagulation may be adversely affected, with unfavorable impact on outcome following cardiac surgery. METHODS: Forty patients were randomly allocated to study groups receiving either acetated Ringer's solution (CT group) or hydroxyethyl starch (HES group, Tetraspan®) as CPB priming solution...
December 1, 2017: Perfusion
https://www.readbyqxmd.com/read/29181852/the-optimal-injection-solution-for-endoscopic-submucosal-dissection-a-randomized-controlled-trial-of-western-solutions-in-a-porcine-model
#9
Neal Mehta, Andrew T Strong, Matheus Franco, Tyler Stevens, Prabhleen Chahal, Sunguk Jang, Rocio Lopez, Deepa Patil, Seichiiro Abe, Yutaka Saito, Toshio Uraoka, John Vargo, Amit Bhatt
BACKGROUND: When performing endoscopic submucosal dissection (ESD), procedural safety increases with greater tissue elevation and efficiency increases with longer-lasting submucosal cushion. Fluids specifically developed for ESD in Asia aren't commercially available in the West, leading endoscopists to use a variety of injectable fluids off-label. To determine the optimal fluid available in the West, we compared commonly used fluids for Western ESD. METHODS: All phases were performed in an ex-vivo porcine stomach model...
November 27, 2017: Digestive Endoscopy: Official Journal of the Japan Gastroenterological Endoscopy Society
https://www.readbyqxmd.com/read/29174121/pro-third-generation-hydroxyethyl-starch-solution-is-safe-and-effective-for-plasma-volume-expansion-during-cardiac-surgery
#10
Matthew McConnell, Josh Baisden, Andra E Duncan
No abstract text is available yet for this article.
August 12, 2017: Journal of Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/29165077/physicochemical-and-toxic-properties-of-novel-genipin-drug-delivery-systems-prepared-by-mechanochemistry
#11
Wenhao Xu, Murong Wen, Weike Su, Alexander V Dushkin, Lubov P Suntsova, Irina D Markova, Olga Yu Selyutina, Nikolay E Polyakov
Complexes of Genipin and differents water-soluble adjuvant polysaccharides such as arabinogalactane, hydroxyethyl starch, fibergum,and oligosaccharides β-CD and HP-β-CD,were synthesized as drug delivery system using mechanochemical technology. We have investigated physicochemical properties, stability, and hepatotoxicity of the synthesized complexes in solid state and aqueous solution. The formation of the complexes was evidenced by different physical and spectroscopy assays, and the stability constants of our synthesized Genipin-based complexes were also calculated...
November 20, 2017: Current Drug Delivery
https://www.readbyqxmd.com/read/29159316/in-vitro-starch-hydrolysis-of-chitosan-incorporating-whey-protein-and-wheat-starch-composite-gels
#12
Natasha Yang, John Ashton, Elisabeth Gorczyca, Stefan Kasapis
The study examined the influence of chitosan, incorporated into whey protein and wheat starch thermo gels, on the in-vitro hydrolysis of the polysaccharide. Gels were subjected to the following external conditions containing α-amylase at constant incubation temperature of 37 °C: In the first procedure, they were immersed in phosphate buffer (0.05 M) and maintained at pH 6.9 throughout the entire digestion. In the second instance, they were introduced into a salt solution, with pH and total volume adjusted at times in sync with the human gastrointestinal tract...
October 2017: Heliyon
https://www.readbyqxmd.com/read/29154877/investigation-the-effect-of-graphene-oxide-and-gelatin-starch-weight-ratio-on-the-properties-of-starch-gelatin-go-nanocomposite-films-the-rsm-study
#13
Shima Afshar, Hossein Banisadi
In this study, we reported the design and fabrication of starch/gelatin/graphene oxide biodegradable nanocomposite films with proper potential for food packaging applications. The experiments were designed using Design Expert software via RSM by defining gelatin/starch weight ratio (G/S wt. ratio) and graphene oxide (GO) wt.% as process parameters affecting on the properties of the prepared films. The optimization was done and various properties of the optimum film were investigated. The XRD and SEM images confirmed that GO layers could intercalate in the starch/gelatin matrix and proper dispersion of nanofillers in the matrix obtained via solution casting method...
November 14, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29152461/use-of-toll-like-receptor-assays-for-the-detection-of-bacterial-contaminations-in-icodextrin-batches-released-for-peritoneal-dialysis
#14
Hêla Hacine-Gherbi, Agnès Denys, Mathieu Carpentier, Arnaud Heysen, Pierrick Duflot, Pierre Lanos, Fabrice Allain
Icodextrin is a starch derivative used for preparing solutions of peritoneal dialysis. Unfortunately, peptidoglycans (PGN) and lipopolysaccharides (LPS) have been reported to contaminate certain icodextrin batches and to contribute to the development of sterile peritonitis. The decision of selecting or rejecting icodextrin batches is however difficult, because of limitations in the detection of these bacterial contaminants. Besides monocyte activation tests of cytokine release, a number of bio-assays using stably TLR-transfected cell lines have been developed...
2017: Toxicology Reports
https://www.readbyqxmd.com/read/29151081/association-between-standard-laboratory-and-functional-tests-of-coagulation-in-dilutional-coagulopathy-an-in-vitro-study
#15
L J Krzych, P F Czempik
Standard laboratory tests (SLTs) of coagulation are in common use in clinical practice. We aimed to determine the association between SLTs and functional tests of coagulation in blood samples diluted with balanced crystalloid and colloid solutions in an ex vivo setting. The study group comprised 32 healthy young male volunteers. Whole blood samples were diluted at a 4:1 ratio with balanced crystalloid (Plasmalyte®) and two balanced colloids, 6% hydroxyethyl starch 130/0.4 (Volulyte®) and succinylated gelatin (Geloplasma®)...
August 2017: Journal of Physiology and Pharmacology: An Official Journal of the Polish Physiological Society
https://www.readbyqxmd.com/read/29150842/the-effect-of-6-hydroxyethyl-starch-130-0-4-on-acute-kidney-injury-in-paediatric-cardiac-surgery-a-prospective-randomised-trial
#16
H-W Oh, J-H Lee, H-C Kim, E-H Kim, I-K Song, H-S Kim, J-T Kim
We have evaluated the effect of a colloid solution on acute kidney injury in paediatric cardiac surgery. A total of 195 patients were ramdomly divided into an hydroxyethyl starch group and a control group. In the starch group, 6% hydroxyethyl starch 130/0.4 (Volulyte® ) was used as the primary fluid for volume resuscitation but was limited to 30 ml.kg-1 . In the control group, only crystalloid fluid was used during the peri-operative period. The incidence of acute kidney injury, peri-operative transfusion, clinical outcomes and laboratory data were compared...
November 17, 2017: Anaesthesia
https://www.readbyqxmd.com/read/29146428/preparative-fractionation-of-dextrin-by-polyethylene-glycol-effects-of-initial-dextrin-concentration-and-ph
#17
Xiuting Hu, Yu Wang, Chengmei Liu, Zhengyu Jin, Yaoqi Tian
Polyethylene glycol (PEG) was further applied for fractionating dextrin prepared from cassava starch. The initial dextrin concentration and pH of the dextrin solutions were crucially considered in this study with the average molecular-weight dispersity (DMa) as the index. The results showed that the initial dextrin concentration significantly affected the mass fraction and the molecular weight distribution of each dextrin fraction obtained from gradient PEG precipitation. However, the initial dextrin concentration, which ranged from 0...
November 11, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29137998/effect-of-temperature-and-selected-sugars-on-dilute-solution-properties-of-two-hairless-canary-seed-starches-compared-with-wheat-starch
#18
Ali Heydari, Seyed Mohammad Ali Razavi, Mahdi Irani
In this paper, influence of temperature (25, 35, 45 and 55°C) and sugars (sucrose and lactose) at different concentrations (0, 5, 10 and 15%) on some molecular parameters of starches from two canary seed varieties (C05041 and CDC Maria) in the dilute regime were investigated in comparison to wheat starch (WS). The results indicated that the intrinsic viscosity ([η]) values of C05041, CDC Maria and WS samples were 1.42, 1.46 and 1.70 dl/g at 25°C, respectively. Intrinsic viscosity of selected starches decreased with an increase in temperature, but the effect of high temperatures were somewhat unnoticeable...
November 11, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29137091/the-effects-of-hypervolemic-infusion-on-microcirculation-perfusion-of-patients-during-laparoscopic-colorectal-surgery
#19
RANDOMIZED CONTROLLED TRIAL
Yunxin Deng, Qianlin Zhu, Buwei Yu, Minhua Zheng, Jue Jin
The aim of this study is to assess the effects of hypervolemic infusion with different solutions on microcirculation perfusion during laparoscopic colorectal surgery.Thirty-six patients were randomly divided into Ringer lactate solution [RL] group, succinylated gelatin injection [Gel] group, and hypertonic saline hydroxyethyl starch 40 injection [HS] group. Hypervolemic infusion was performed during the induction period of general anesthesia. Arterial blood-gas parameters, noninvasive hemodynamics, gastric tonometry values, and central venous pressure (CVP) were compared at baseline (T1); the end of hypervolemic infusion (T2); 5 min (T3), 15 min (T4), 30 min (T5), and 60 min (T6) during pneumoperitoneum; 5 min (T7), 15 min (T8), and 25 min (T9) after pneumoperitoneum...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29133086/role-of-entanglement-concentration-in-dynamic-viscoelasticity-and-film-forming-property-of-cereal-starches
#20
Li Guo
Entanglement concentration (ce, w/v) means the onset of overlap and interpenetration of random-coil chains in a macromolecule solution. The effects of ce on the dynamic viscoelasticity and film-forming property of cereal starches were investigated. The results showed that ce affected significantly the ratio of crystalline to amorphous regions of normal rice starch, waxy rice starch, normal maize starch and wheat starch because the absorbance ratio (1047cm(-1)/1022cm(-1)) increased more obviously at concentrations increasing from 0...
November 10, 2017: International Journal of Biological Macromolecules
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