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Colloid Solution

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1. Molecular mechanisms of mesoporous silica formation from colloid solution: Ripening-reactions arrest hollow network structures. (PubMed)

Molecular mechanisms of mesoporous silica formation from colloid solution: Ripening-reactions arrest hollow network structures. The agglomeration of silica nanoparticles in aqueous solution is investigated from molecular simulations. Mimicking destabilization of colloidal solutions by full removal of protective moieties or surface charge, association of SiO2/Si(OH)4 core/shell particles leads to rapid proton transfer reactions that account for local silanole → silica ripening reactions. Yet (...) , such virtually barrier-less binding is only observed within a limited contact zone. Agglomeration hence leads to the formation of oligomers of nanoparticles, whilst full merging into a compact precipitate is hampered by the need for extended structural reorganisation. Implementing sufficiently fast supply from colloidal solution, our simulations show the development of silica networks comprised of covalently bound, yet not fully merged nanoparticles. Within the oligomerized nanoparticle network, coordination

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2019 PLoS ONE

2. Colloidal solution of silver nanoparticles for label-free colorimetric sensing of ammonia in aqueous solutions (PubMed)

Colloidal solution of silver nanoparticles for label-free colorimetric sensing of ammonia in aqueous solutions Silver nanoparticles were synthesized in the presence of saccharides and ammonia (NH3) in the concentration range from 10-2 to 103 ppm to develop an optical sensor for NH3 in aqueous solutions. Ammonia affects the features of the nanoparticles obtained in a concentration-dependent manner as determined by UV-vis absorption analysis and TEM observations. Structural and morphological

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2018 Beilstein journal of nanotechnology

3. Changes in colloid solution sales in Nordic countries. (PubMed)

Changes in colloid solution sales in Nordic countries. 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 (...) in the sales of HES solutions. A reduction in sales of other synthetic colloids has also occurred. During the same period, we found a 46% increase in albumin sales, but these numbers varied between Nordic countries.The general reduction in colloid sales likely reflects the recommendation that colloids should be used only in special circumstances. The dramatic reduction in the sales of HES solutions was expected given evidence of harm and the official warnings. The steady increase in albumin sales

2018 Acta Anaesthesiologica Scandinavica

4. The Effects of Pre-Spinal Anesthesia Administration of Crystalloid and Colloid Solutions on Hypotension in Elective Cesarean Section (PubMed)

The Effects of Pre-Spinal Anesthesia Administration of Crystalloid and Colloid Solutions on Hypotension in Elective Cesarean Section Spinal anesthesia is an appropriate alternative for general anesthesia in many operations, particularly in cesarean section. However, the induced hypotension is the main drawback of this method. Therefore, the current study aimed at comparing the effects of crystalloid and colloid solutions used as the preload on the post-spinal hypotension and its complications (...) anesthesia, urine output, nausea, and vomiting were comparatively assessed between the two groups.The percentages of reduction in SBP and DBP variables in the crystalloid solution were higher than those of the colloid group and the differences were statistically significant (P = 0.042 and P = 0.008, respectively). Average percentage of HR changes was more significant in the crystalloid than the colloid group (P = 0.032). In contrary, administration of the two types of solutions did not result

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2018 Anesthesiology and pain medicine

5. Long-term Impact of Crystalloid versus Colloid Solutions on Renal Function and Disability-free Survival after Major Abdominal Surgery. (PubMed)

Long-term Impact of Crystalloid versus Colloid Solutions on Renal Function and Disability-free Survival after Major Abdominal Surgery. Balanced hydroxyethyl starch solution, as part of intraoperative goal-directed fluid therapy, is associated with better short-term outcomes than administration of a balanced crystalloid solution in patients having major open abdominal surgeryThe safety of modern hydroxyethyl starch solutions remains debated, with some studies in the intensive care setting have (...) a differenceDisability-free survival was higher in the colloid than in the crystalloid group BACKGROUND:: The authors recently demonstrated that administration of balanced hydroxyethyl starch solution as part of intraoperative goal-directed fluid therapy was associated with better short-term outcomes than administration of a balanced crystalloid solution in patients having major open abdominal surgery. In the present study, a 1-yr follow-up of renal and disability outcomes in these patients was performed.All

2018 Anesthesiology

6. Colloid solutions for fluid resuscitation. (PubMed)

Colloid solutions for fluid resuscitation. Colloids are widely used in the replacement of fluid volume. However doubts remain as to which colloid is best. Different colloids vary in their molecular weight and therefore in the length of time they remain in the circulatory system. Because of this and their other characteristics, they may differ in their safety and efficacy.To compare the effects of different colloid solutions in patients thought to need volume replacement.We searched the Cochrane (...) Injuries Group's specialised register, CENTRAL (2007, Issue 1), MEDLINE (1994 to March 2007), EMBASE (1974 to March 2007), and the National Research Register (2007, Issue 1). Bibliographies of trials retrieved were searched, and drug companies manufacturing colloids were contacted for information. The search was last updated in March 2007.Randomised and quasi-randomised trials comparing colloid solutions in critically ill and surgical patients thought to need volume replacement. The outcomes measured

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2011 Cochrane

7. Colloids versus crystalloids for fluid resuscitation in critically ill people. (PubMed)

Colloids versus crystalloids for fluid resuscitation in critically ill people. Critically ill people may lose fluid because of serious conditions, infections (e.g. sepsis), trauma, or burns, and need additional fluids urgently to prevent dehydration or kidney failure. Colloid or crystalloid solutions may be used for this purpose. Crystalloids have small molecules, are cheap, easy to use, and provide immediate fluid resuscitation, but may increase oedema. Colloids have larger molecules, cost (...) CENTRAL, MEDLINE, Embase and two other databases on 23 February 2018. We also searched clinical trials registers.We included randomised controlled trials (RCTs) and quasi-RCTs of critically ill people who required fluid volume replacement in hospital or emergency out-of-hospital settings. Participants had trauma, burns, or medical conditions such as sepsis. We excluded neonates, elective surgery and caesarean section. We compared a colloid (suspended in any crystalloid solution) versus a crystalloid

2018 Cochrane

8. Effect of infusion of equine plasma or 6% hydroxyethyl starch (600/0.75) solution on plasma colloid osmotic pressure in healthy horses. (PubMed)

Effect of infusion of equine plasma or 6% hydroxyethyl starch (600/0.75) solution on plasma colloid osmotic pressure in healthy horses. OBJECTIVE To compare the effects of equivalent volumes of equine plasma and 6% hydroxyethyl starch (600/0.75) solution (hetastarch) administered IV on plasma colloid osmotic pressure (pCOP) and commonly monitored clinicopathologic variables in horses. ANIMALS 6 healthy mares. PROCEDURES In a randomized, crossover study, horses were administered hetastarch

2017 American journal of veterinary research

9. The Interaction between Zein and Lecithin in Ethanol-Water Solution and Characterization of Zein-Lecithin Composite Colloidal Nanoparticles. (PubMed)

The Interaction between Zein and Lecithin in Ethanol-Water Solution and Characterization of Zein-Lecithin Composite Colloidal Nanoparticles. Lecithin, a naturally small molecular surfactant, which is widely used in the food industry, can delay aging, enhance memory, prevent and treat diabetes. The interaction between zein and soy lecithin with different mass ratios (20:1, 10:1, 5:1, 3:1, 2:1, 1:1 and 1:2) in ethanol-water solution and characterisation of zein and lecithin composite colloidal (...) nanoparticles prepared by antisolvent co-precipitation method were investigated. The mean size of zein-lecithin composite colloidal nanoparticles was firstly increased with the rise of lecithin concentration and then siginificantly decreased. The nanoparticles at the zein to lecithin mass ratio of 5:1 had the largest particle size (263 nm), indicating that zein and lecithin formed composite colloidal nanoparticles, which might aggregate due to the enhanced interaction at a higher proportion of lecithin

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2016 PLoS ONE

10. Structure and Dynamics of Bimodal Colloidal Dispersions in a Low-Molecular Weight Polymer Solution (PubMed)

Structure and Dynamics of Bimodal Colloidal Dispersions in a Low-Molecular Weight Polymer Solution We present an experimental study of the structural and dynamical properties of bimodal, micrometer-sized colloidal dispersions (size ratio ≈ 2) in an aqueous solution of low-molecular-weight polymer (polyethylene glycol 2000) using synchrotron ultra-small angle X-ray scattering (USAXS) and USAXS-based X-ray photon correlation spectroscopy. We fixed the volume fraction of the large particles at 5 (...) % and systematically increased the volume fraction of the small particles from 0 to 5% to evaluate their effects on the structure and dynamics. The bimodal dispersions were homogenous through the investigated parameter space. We found that the partial structure factors can be satisfactorily retrieved for the bimodal colloidal dispersions using a Percus-Yevick hard-sphere potential when the size distributions of the particles were taken into account. We also found that the partial structure factor between the large

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2017 Langmuir : the ACS journal of surfaces and colloids

11. Agglomeration of Luminescent Porous Silicon Nanoparticles in Colloidal Solutions (PubMed)

Agglomeration of Luminescent Porous Silicon Nanoparticles in Colloidal Solutions We have prepared colloidal solutions of clusters composed from porous silicon nanoparticles in methanol, water and phosphate-buffered saline (PBS). Even if the size of the nanoclusters is between 60 and 500 nm, due to their highly porous "cauliflower"-like structure, the porous silicon nanoparticles are composed of interconnected nanocrystals having around 2.5 nm in size and showing strong visible luminescence (...) in the orange-red spectral region (centred at 600-700 nm). Hydrophilic behaviour and good solubility of the nanoclusters in water and water-based solutions were obtained by adding hydrogen peroxide into the etching solution during preparation and 16 min long after-bath in hydrogen peroxide. By simple filtration of the solutions with syringe filters, we have extracted smaller nanoclusters with sizes of approx. 60-70 nm; however, these nanoclusters in water and PBS solution (pH neutral) are prone

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2016 Nanoscale research letters

12. Application of L-Aspartic Acid-Capped ZnS:Mn Colloidal Nanocrystals as a Photosensor for the Detection of Copper (II) Ions in Aqueous Solution (PubMed)

Application of L-Aspartic Acid-Capped ZnS:Mn Colloidal Nanocrystals as a Photosensor for the Detection of Copper (II) Ions in Aqueous Solution Water-dispersible ZnS:Mn nanocrystals (NCs) were synthesized by capping the surface with polar L-aspartic acid (Asp) molecules. The obtained ZnS:Mn-Asp NC product was optically and physically characterized using the corresponding spectroscopic methods. The ultra violet-visible (UV-VIS) absorption spectrum and photoluminescence (PL) emission spectrum (...) of agglomerates in water with an average size of 19.8 nm, and a negative surface charge (-4.58 mV) in water at ambient temperature. The negatively-charged NCs were applied as a photosensor for the detection of specific cations in aqueous solution. Accordingly, the ZnS:Mn-Asp NCs showed an exclusive luminescence quenching upon addition of copper (II) cations. The kinetic mechanism study on the luminescence quenching of the NCs by the addition of the Cu2+ ions proposed an energy transfer through the ionic

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2016 Nanomaterials

13. Green synthesis and antibacterial effects of aqueous colloidal solutions of silver nanoparticles using camomile terpenoids as a combined reducing and capping agent (PubMed)

Green synthesis and antibacterial effects of aqueous colloidal solutions of silver nanoparticles using camomile terpenoids as a combined reducing and capping agent Green synthesis method using camomile extract was applied to synthesize silver nanoparticles to tune their antibacterial properties merging the synergistic effect of camomile and Ag. Scanning transmission electron microscopy revealed that camomile extract (CE) consisted of porous globular nanometer sized structures, which were

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2016 Bioprocess and biosystems engineering

14. Colloid Solution

Colloid Solution Colloid Solution Toggle navigation Brain Head & Neck Chest Endocrine Abdomen Musculoskeletal Skin Infectious Disease Hematology & Oncology Cohorts Diagnostics Emergency Findings Procedures Prevention & Management Pharmacy Resuscitation Trauma Emergency Procedures Ultrasound Cardiovascular Emergencies Lung Emergencies Infectious Disease Pediatrics Neurologic Emergencies Skin Exposure Miscellaneous Abuse Cancer Administration 4 Colloid Solution Colloid Solution Aka: Colloid (...) Solution II. Types Albumin 5% May be beneficial in (e.g. ) Avoid in Synthetic colloid (Hetastarch, Dextran 40 or 60) Not recommended (FFP) Used for reversal, not for volume expansion III. Advantages Remains in intravascular space for hours IV. Disadvantages Risk of sensitivity reactions V. References Loflin (2015) Crit Dec Emerg Med 29(9): 11-18 Images: Related links to external sites (from Bing) These images are a random sampling from a Bing search on the term "Colloid Solution." Click on the image

2018 FP Notebook

15. Discontinous change from thermally- to geometrically-dominated effective interactions in colloidal solutions (PubMed)

Discontinous change from thermally- to geometrically-dominated effective interactions in colloidal solutions We report numerical results for the effective potential arising between two colloids immersed in a self-assembling cosolute which forms reversible clusters. The potential is evaluated at cosolute state points with different densities and temperatures but with the same connectivity properties. We find that the range of the resulting effective potential is controlled only by the cosolute

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2016 Soft matter

16. Effect of Intraoperative Goal-directed Balanced Crystalloid versus Colloid Administration on Major Postoperative Morbidity: A Randomized Trial

Effect of Intraoperative Goal-directed Balanced Crystalloid versus Colloid Administration on Major Postoperative Morbidity: A Randomized Trial WHAT THIS ARTICLE TELLS US THAT IS NEW: BACKGROUND:: Crystalloid solutions leave the circulation quickly, whereas colloids remain for hours, thus promoting hemodynamic stability. However, colloids are expensive and promote renal toxicity in critical care patients. This study tested the hypothesis that goal-directed colloid administration during elective (...) abdominal surgery decreases 30-day major complications more than goal-directed crystalloid administration.In this parallel-arm double-blinded multicenter randomized trial, adults having moderate- to high-risk open and laparoscopically assisted abdominal surgery with general anesthesia were randomly assigned to Doppler-guided intraoperative volume replacement with 6% hydroxyethyl starch 130/0.4 (n = 523) or lactated Ringer's solution (n = 534). The primary outcome was a composite of serious postoperative

2019 EvidenceUpdates

17. Hydroxyethyl starch solutions: CMDh introduces new measures to protect patients

to prevent a dangerous drop in blood pressure following acute bleeding. They belong to the class of medicines known as colloids. Besides blood products, there are two types of medicines used for plasma volume replacement: crystalloids and colloids. Colloids contain large molecules such as starch, whereas crystalloids, such as saline or Ringer's solutions, are electrolyte solutions. In the European Union, HES solutions for infusion have been approved via national procedures and are available in the Member (...) Hydroxyethyl starch solutions: CMDh introduces new measures to protect patients Hydroxyethyl starch solutions: CMDh introduces new measures to protect patients | European Medicines Agency Search Search Menu Hydroxyethyl starch solutions: CMDh introduces new measures to protect patients Press release 29/06/2018 Medicines to remain on the market provided that training, controlled access and warnings on the packaging are implemented The 1 has decided that hydroxyethyl starch (HES) solutions

2018 European Medicines Agency - EPARs

18. Are Colloids Better Than Crystalloids for Fluid Resuscitation in Critically Ill Patients?

Are Colloids Better Than Crystalloids for Fluid Resuscitation in Critically Ill Patients? Systematic Review Snapshot TAKE-HOME MESSAGE Colloid solutions offer no advantage over crystalloids for the resuscitation of critically ill patients. Are Colloids Better Than Crystalloids for Fluid Resuscitation in Critically Ill Patients? EBEM Commentators Brian Hohertz, MD Rawle A. Seupaul, MD Talmage M. Holmes, PhD, MPH Department of Emergency Medicine University of Arkansas for Medical Sciences Little (...) for allocation concealment. No pre- speci?ed subgroup analyses were conducted. When trials by Boldt were removed, the results were unchanged.* Commentary There has been considerable debate over the optimal intravenous solution Table. Risk of mortality in patients resuscitated with colloids versus crystalloids. Colloid N* RR 95% CI I 2 ,% Albumin or PPF 9,920 1.01 0.93–1.10 15 Hydroxylethyl starch 9,147 1.10 1.02–1.19 0 Modi?ed gelatin 506 0.91 0.49–1.72 0 Dextran 834 1.24 0.94–1.65 0 RR, Relative risk; CI

2015 Annals of Emergency Medicine Systematic Review Snapshots

19. The brain relaxation and cerebral metabolism in stroke volume variation-directed fluid therapy during supratentorial tumors resection: crystalloid solution versus colloid solution. (PubMed)

The brain relaxation and cerebral metabolism in stroke volume variation-directed fluid therapy during supratentorial tumors resection: crystalloid solution versus colloid solution. Compared with goal-directed crystalloid therapy, goal-directed colloid therapy during high-risk surgery may improve postoperative outcome. Whether intraoperative fluid therapy based on goal-directed protocol with different types of fluid has distinctive effects on brain relaxation and cerebral metabolism during

2014 Journal of neurosurgical anesthesiology

20. Crystalloid versus Colloid for Intraoperative Goal-directed Fluid Therapy Using a Closed-loop System: A Randomized, Double-blinded, Controlled Trial in Major Abdominal Surgery

with fewer postoperative complications compared to balanced crystalloids in patients having major elective abdominal surgery.One hundred and sixty patients were enrolled in the protocol. All patients had maintenance-balanced crystalloid administration of 3 ml · kg · h. A closed-loop system delivered additional 100-ml fluid boluses (patients were randomized to receive either a balanced-crystalloid or colloid solution) according to a predefined goal-directed strategy, using a stroke volume and stroke (...) Crystalloid versus Colloid for Intraoperative Goal-directed Fluid Therapy Using a Closed-loop System: A Randomized, Double-blinded, Controlled Trial in Major Abdominal Surgery The type of fluid and volume regimen given intraoperatively both can impact patient outcome after major surgery. This two-arm, parallel, randomized controlled, double-blind, bi-center superiority study tested the hypothesis that when using closed-loop assisted goal-directed fluid therapy, balanced colloids are associated

2017 EvidenceUpdates

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