3,786 results match your criteria biological liquids

Gas Chromatography-Mass Spectrometry Paired with Total Vaporization Solid-Phase Microextraction as a Forensic Tool.

J Vis Exp 2021 May 25(171). Epub 2021 May 25.

Department of Chemistry & Chemical Biology, Indiana University - Purdue University Indianapolis; Forensic & Investigative Sciences Program, Indiana University - Purdue University Indianapolis;

Gas Chromatography - Mass Spectrometry (GC-MS) is a frequently used technique for the analysis of numerous analytes of forensic interest, including controlled substances, ignitable liquids, and explosives. GC-MS can be coupled with Solid-Phase Microextraction (SPME), in which a fiber with a sorptive coating is placed into the headspace above a sample or immersed in a liquid sample. Analytes are sorbed onto the fiber which is then placed inside the heated GC inlet for desorption. Read More

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Tribological properties of a series of carbon dots modified by ionic liquids with various anion species: experimental findings and density functional theory calculations.

Dalton Trans 2021 Jun 14. Epub 2021 Jun 14.

College of Biological and Chemical Engineering, Panzhihua University, Panzhihua 617000, P. R. China.

A series of carbon dots modified by ionic liquids with various anion species (CDs-ILs-X) were facilely synthesized by a one-pot pyrolysis method and subsequent anion exchange processes, where X- represented the anions of hexafluorophosphate (PF6-), bis(trifluorosulfonyl) imide (NTf2-), bis(salicylato) borate (BScB-) and oleate (OL-). Their tribological properties as lubricant additives of polyethylene glycol (PEG200) were investigated under the ball-on-plate reciprocating mode and steel/steel contact. The maximum friction coefficient and wear volume reductions of PEG200 triggered by CDs-ILs-PF6, CDs-ILs-NTf2, CDs-ILs-BScB and CDs-ILs-OL were up to 42. Read More

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Effects of Layering and Supporting Substrate on Liquid Slip at the Single-Layer Graphene Interface.

ACS Nano 2021 Jun 11. Epub 2021 Jun 11.

Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, 205 North Matthews Avenue, Urbana, Illinois 61801, United States.

Understanding modulation of liquid molecule slippage along graphene surfaces is crucial for many promising applications of two-dimensional materials, such as in sensors, nanofluidic devices, and biological systems. Here, we use force measurements by atomic force microscopy (AFM) to directly measure hydrodynamic, solvation, and frictional forces along the graphene plane in seven liquids. The results show that the greater slip lengths correlate with the interfacial ordering of the liquid molecules, which suggests that the ordering of the liquid forming multiple layers promotes slip. Read More

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Ionic liquid-based antimicrobial materials for water treatment, air filtration, food packaging and anticorrosion coatings.

Adv Colloid Interface Sci 2021 May 27;294:102454. Epub 2021 May 27.

Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute, Palacký University in Olomouc, Šlechtitelů 27, 783 71 Olomouc, Czech Republic.

Efforts to widen the scope of ionic liquids applications across diverse research areas have flourished in the last two decades with developments in understanding and tailoring their physical, chemical, and biological properties. The promising applications of ionic liquids-based materials as antimicrobial systems is due to their ability and flexibility to be tailored in varying sizes, morphologies, and surface charges. Ionic liquids are also considered as greener materials. Read More

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Manifestations of metastable criticality in the long-range structure of model water glasses.

Nat Commun 2021 Jun 7;12(1):3398. Epub 2021 Jun 7.

Department of Chemical and Biological Engineering, Princeton University, Princeton, NJ, USA.

Much attention has been devoted to water's metastable phase behavior, including polyamorphism (multiple amorphous solid phases), and the hypothesized liquid-liquid transition and associated critical point. However, the possible relationship between these phenomena remains incompletely understood. Using molecular dynamics simulations of the realistic TIP4P/2005 model, we found a striking signature of the liquid-liquid critical point in the structure of water glasses, manifested as a pronounced increase in long-range density fluctuations at pressures proximate to the critical pressure. Read More

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Magnetic field-mediated Janus particles with sustained driving capability for severe bleeding control in perforating and inflected wounds.

Bioact Mater 2021 Dec 18;6(12):4625-4639. Epub 2021 May 18.

State Key Laboratory of Silkworm Genome Biology, College of Sericulture, Textile and Biomass Sciences, Southwest University, Chongqing, 400715, China.

Severe bleeding in perforating and inflected wounds with forky cavities or fine voids encountered during prehospital treatments and surgical procedures is a complex challenge. Therefore, we present a novel hemostatic strategy based on magnetic field-mediated guidance. The biphasic Janus magnetic particle ([email protected]) comprised aggregates of α-FeO nanoparticles (FeO NPs) as the motion actuator, negatively modified microporous starch (MSS) as the base hemostatic substrate, and thrombin as the loaded hemostatic drug. Read More

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December 2021

Micro RNA (miRNA) Differential Expression and Exposure to Crude-Oil-Related Compounds.

Microrna 2021 Jun 4. Epub 2021 Jun 4.

Department of Health Sciences, University of Genova, Via Pastore 1, 16132 Genoa, Italy.

This review summarizes studies about miRNA differential regulation related to exposure to crude-oil and 20 different crude-oil chemicals as hydrocarbons, sulphured, nitrogen, and metal-containing compounds. It may be interesting to explore the possibility of using early post-transcriptional regulators as a potential novel exposure-biomarker. Crude-oil has been defined as a highly complex mixture of solids, liquids, and gases. Read More

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A Fluorinated Ionic Liquid-Based Activatable F MRI Platform Detects Biological Targets.

Chem 2020 May 24;6(5):1134-1148. Epub 2020 Feb 24.

Department of Chemical Biology, State Key Laboratory of Physical Chemistry of Solid Surfaces, The MOE Key Laboratory of Spectrochemical Analysis & Instrumentation, The Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.

F magnetic resonance imaging (F MRI) is a promising technique for molecular imaging and clinical diagnosis, benefiting from its negligible background and unlimited tissue penetration depth. However, the development of F probes with good water solubility and versatile functions for bioresponsive and practical applications remains a challenge. Here, we report fluorinated ion liquids (ILs) as a new type of fluorine agents and build a fluorinated ionic liquid-based activatable F MRI platform (FILAMP), which relies on the phase transition of ILs. Read More

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Ionic Liquids-A Review of Their Toxicity to Living Organisms.

Int J Mol Sci 2021 May 25;22(11). Epub 2021 May 25.

Centro de Química Estrutural, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisbon, Portugal.

Ionic liquids (ILs) were initially hailed as a green alternative to traditional solvents because of their almost non-existent vapor pressure as ecological replacement of most common volatile solvents in industrial processes for their damaging effects on the environment. It is common knowledge that they are not as green as desired, and more thought must be put into the biological consequences of their industrial use. Still, compared to the amount of research studying their physicochemical properties and potential applications in different areas, there is a scarcity of scientific papers regarding how these substances interact with different organisms. Read More

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The Quest to Quantify Selective and Synergistic Effects of Plasma for Cancer Treatment: Insights from Mathematical Modeling.

Int J Mol Sci 2021 May 10;22(9). Epub 2021 May 10.

Research Group PLASMANT, Department of Chemistry, University of Antwerp, Universiteitsplein 1, B-2610 Wilrijk-Antwerp, Belgium.

Cold atmospheric plasma (CAP) and plasma-treated liquids (PTLs) have recently become a promising option for cancer treatment, but the underlying mechanisms of the anti-cancer effect are still to a large extent unknown. Although hydrogen peroxide (H2O2) has been recognized as the major anti-cancer agent of PTL and may enable selectivity in a certain concentration regime, the co-existence of nitrite can create a synergistic effect. We develop a mathematical model to describe the key species and features of the cellular response toward PTL. Read More

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Trends in Managing Cardiac and Orthopaedic Device-Associated Infections by Using Therapeutic Biomaterials.

Polymers (Basel) 2021 May 12;13(10). Epub 2021 May 12.

Institute of Polymers, Composites and Biomaterials of National Research Council (IPCB-CNR), 80125 Naples, Italy.

Over the years, there has been an increasing number of cardiac and orthopaedic implanted medical devices, which has caused an increased incidence of device-associated infections. The surfaces of these indwelling devices are preferred sites for the development of biofilms that are potentially lethal for patients. Device-related infections form a large proportion of hospital-acquired infections and have a bearing on both morbidity and mortality. Read More

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Surface Testing of Dental Biomaterials-Determination of Contact Angle and Surface Free Energy.

Materials (Basel) 2021 May 21;14(11). Epub 2021 May 21.

Department of Applied Mechanics and Biomechanics, Faculty of Mechanical Engineering, Tadeusz Kosciuszko Cracow University of Technology, 37 Jana Pawla II Av., 31-864 Cracow, Poland.

The key goal of this study was to characterize surface properties of chosen dental materials on the base on the contact angle measurements and surface free energy calculations. Tested materials were incubated in the simulated oral environment and drinks to estimate an influence of conditions similar to those in the oral cavity on wetting and energetic state of the surface. Types of materials were as follows: denture acrylic resins, composite and PET-G dental retainer to compare basic materials used in a prosthetics, restorative dentistry and orthodontics. Read More

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Dynamical time scales of friction dynamics in active microrheology of a model glass.

Soft Matter 2021 May;17(20):5162-5169

School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul 08826, Korea and School of Physics, Korea Institute for Advanced Study, Seoul 02455, Korea.

Owing to the local/heterogeneous structures in supercooled liquids, after several decades of research, it is now clear that supercooled liquids are structurally different from their conventional liquid counterparts. Accordingly, an approach based on a local probe should provide a better understanding about the local mechanical properties as well as heterogeneous structures. Recently, the superiority of active microrheology over global rheology has been demonstrated [Yu et al. Read More

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Interfacial Polymerization at the Alkane/Ionic Liquid Interface.

Angew Chem Int Ed Engl 2021 Jun 19;60(26):14636-14643. Epub 2021 May 19.

MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, China.

Polymerization at the liquid-liquid interface has attracted much attention for synthesizing ultrathin polymer films for molecular sieving. However, it remains a major challenge to conduct this process outside the alkane-water interface since it not only suffers water-caused side reactions but also is limited to water-soluble monomers. Here, we report the interfacial polymerization at the alkane/ionic liquid interface ([email protected]) where the ionic liquid acts as the universal solvent for diversified amines to synthesize task-specific polyamide nanofilms. Read More

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Developments in Nano-materials and Analysing its role in Fighting COVID-19.

Mater Today Proc 2021 May 9. Epub 2021 May 9.

Ethiopian Technical University, Addis Ababa, Ethiopia.

Nanomaterials like silver, iron, ceramic, graphene carbon nanotubes, etc. These are used to develop and create multifunctional materials to fight the corona virus. This work focuses on analyzing and discussing the developments of Nano-materials and their effectiveness in fighting and preventing the spread of the corona virus. Read More

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Identification and Classification of Commercially Relevant Per- and Poly-fluoroalkyl Substances (PFAS).

Integr Environ Assess Manag 2021 May 14. Epub 2021 May 14.

Daikin America, Inc., 905 State Docks Road, Decatur, Alabama, U.S.A., 35601.

Per- and poly-fluoroalkyl substances (PFAS) are a universe of fluorinated organic substances with very different physical, chemical, and biological properties including polymers and non-polymers; solids, liquids, and gases. Commercial PFAS-based products have been used in a wide variety of industrial and consumer applications because they have unique performance properties of significant socioeconomic value. The PFAS definition has evolved and expanded over the years. Read More

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CO Chemisorption Behavior of Coordination-Derived Phenolate Sorbents.

ChemSusChem 2021 May 14. Epub 2021 May 14.

Department of Chemistry, Joint Institute for Advanced Materials, The University of Tennessee, 37996, Knoxville, TN, USA.

CO chemisorption via C-O bond formation is an efficient methodology in carbon capture especially using phenolate-based ionic liquids (ILs) as the sorbents to afford carbonate products. However, most of the current IL systems involve alkylphosphonium cations, leading to side reactions via the ylide intermediate pathway. It is important to figure out the CO chemisorption behavior of phenolate-derived sorbents using inactive and easily accessible cation counterparts without active protons. Read More

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Anion Specific Effects Drive the Formation of Li-Salt Based Aqueous Biphasic Systems.

J Phys Chem B 2021 05 14;125(20):5365-5372. Epub 2021 May 14.

Chimie du Solide et de l'Energie, Collège de France, UMR 8260, 75231 Cedex 05 Paris, France.

Aqueous biphasic systems (ABSs) can form when mixing water with two compounds such as polymers, ionic liquids, or simple salts. While this phenomenon has been known for decades and found applications in various fields such as biology, recycling, or even more recently electrochemistry, the physics behind the formation of ABSs remains ill-understood. It was recently demonstrated that ABSs can be composed of two salts sharing the same cation (Li) but different anions (sulfonamide and halide). Read More

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Spatiotemporal control of cell cycle acceleration during axolotl spinal cord regeneration.

Elife 2021 May 14;10. Epub 2021 May 14.

Systems Biology Group (SysBio), Institute of Physics of Liquids and Biological Systems (IFLySIB), National Scientific and Technical Research Council (CONICET) and University of La Plata (UNLP), La Plata, Argentina.

Axolotls are uniquely able to resolve spinal cord injuries, but little is known about the mechanisms underlying spinal cord regeneration. We previously found that tail amputation leads to reactivation of a developmental-like program in spinal cord ependymal cells (Rodrigo Albors et al., 2015), characterized by a high-proliferation zone emerging 4 days post-amputation (Rost et al. Read More

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Antiproliferative and antibacterial potential of tetrahexylammonium bromide-based ionic liquids.

Exp Ther Med 2021 Jul 23;22(1):672. Epub 2021 Apr 23.

ANAPATMOL Research Center, 'Victor Babes' University of Medicine and Pharmacy of Timisoara, 300041 Timisoara, Romania.

Ionic liquids (ILs) exhibit cytotoxic effects on prokaryotic and eukaryotic cells. In this study, the antibacterial and antiproliferative activities of tetrahexylammonium bromide-based ILs were investigated. In order to evaluate the therapeutic potential of these ionic liquids, firstly microbiological assay using both Gram-positive and Gram-negative bacteria were conducted by employing Disk-Diffusion and 2,3,5-triphenyltetrazolium chlorine (TTC) methods to assess the antimicrobial effects. Read More

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From absolute potentials to a generalized computational standard hydrogen electrode for aqueous and non-aqueous solvents.

Phys Chem Chem Phys 2021 May;23(20):11727-11737

Department of Chemistry and Material Science, School of Chemical Engineering, Aalto University Kemistintie 1, 02150 Espoo, Finland.

We describe a simple and efficient procedure to compute a conversion factor for the absolute potential of the standard hydrogen electrode in water to any other solvent. In contrast to earlier methods our procedure only requires the pKa of an arbitrary acid in water and few simple quantum chemical calculations as input. Thus, it is not affected adversely by experimental shortcomings related to measurements in non-aqueous solvents. Read More

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Review of the toxic effects of ionic liquids.

Sci Total Environ 2021 Sep 30;786:147309. Epub 2021 Apr 30.

School of Chemical Engineering, Chonbuk National University, 567 Beakje-dearo, Deokjin-gu, Jeonju, Jeonbuk 561-756, South Korea. Electronic address:

Interest in ionic liquids (ILs), called green or designer solvents, has been increasing because of their excellent properties such as thermal stability and low vapor pressure; thus, they can replace harmful organic chemicals and help several industrial fields e.g., energy-storage materials production and biomaterial pretreatment. Read More

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September 2021

From Water Solutions to Ionic Liquids with Solid State Nanopores as a Perspective to Study Transport and Translocation Phenomena.

Small 2021 May 6:e2100777. Epub 2021 May 6.

Group for Computational Life Sciences, Ruđer Bošković Institute, Division of Physical Chemistry, 10000, Zagreb, Croatia.

Solid state nanopores are single-molecular devices governed by nanoscale physics with a broad potential for technological applications. However, the control of translocation speed in these systems is still limited. Ionic liquids are molten salts which are commonly used as alternate solvents enabling the regulation of the chemical and physical interactions on solid-liquid interfaces. Read More

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Liquid Wells as Self-Healing, Functional Analogues to Solid Vessels.

Adv Mater 2021 Jun 6;33(23):e2100117. Epub 2021 May 6.

Institute of Biological and Chemical Systems - Functional Materials Systems (IBCS-FMS), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz Pl. 1, 76344, Eggenstein-Leopoldshafen, Germany.

Liquids are traditionally handled and stored in solid vessels. Solid walls are not functional, adaptive, or self-repairing, and are difficult to remove and re-form. Liquid walls can overcome these limitations, but cannot form free-standing 3D walls. Read More

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Use of Silicone Membrane Permeation to Assess Thermodynamic Activities of Ionic Liquids and Their Component Cation and Anion.

Chem Pharm Bull (Tokyo) 2021 ;69(5):481-487

Faculty of Pharmaceutical Sciences, Josai International University.

Ionic liquid (IL) was prepared by mixing lidocaine and ibuprofen as a cation and anion, respectively, at various ratios. We determined the permeation of both compounds from the IL through a silicone membrane selected as a model biological membrane, and mathematically analyzed the permeation data from the viewpoint of the thermodynamic activities of lidocaine, ibuprofen, and the IL. As a result, IL and ibuprofen diffusely permeated through the membrane in the case of applying IL preparations with a molar fraction of ibuprofen of 0. Read More

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January 2021

Antimicrobial and Toxicity Evaluation of Imidazolium-Based Dicationic Ionic Liquids with Dicarboxylate Anions.

Pharmaceutics 2021 Apr 29;13(5). Epub 2021 Apr 29.

Department of Chemistry, Federal University of Santa Maria, Santa Maria 97105-900, Brazil.

Imidazolium-based dicationic ILs (DILs) presenting antimicrobial activity and relatively low toxicity are highly desirable and are envisioned for use in live tissue to prevent bacterial or fungal infections. In this context, we present here DILs with dicarboxylate anions [C(MIM)[C(MIM)][CO-(CH)CO], in which = 4, 6, 8, and 10, and m = 0, 1, 2, 3, 4, and 5. The results showed that DILs with an alkyl chain spacer of ten carbons were active against yeasts and the bacterial strains tested. Read More

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Seaweed Polysaccharide Based Products and Materials: An Assessment on Their Production from a Sustainability Point of View.

Molecules 2021 Apr 29;26(9). Epub 2021 Apr 29.

Natural Products & Green Chemistry Division, CSIR-Central Salt and Marine Chemicals Research Institute, Gijubhai Badheka Marg, Bhavnagar 364002, India.

Among the various natural polymers, polysaccharides are one of the oldest biopolymers present on the Earth. They play a very crucial role in the survival of both animals and plants. Due to the presence of hydroxyl functional groups in most of the polysaccharides, it is easy to prepare their chemical derivatives. Read More

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Composites Based on Hydroxyapatite and Whey Protein Isolate for Applications in Bone Regeneration.

Materials (Basel) 2021 Apr 29;14(9). Epub 2021 Apr 29.

Faculty of Materials Engineering and Physics, Institute of Materials Science, Cracow University of Technology, 31-864 Krakow, Poland.

Hydroxyapatite (HAp) is a bioactive ceramic with great potential for the regeneration of the skeletal system. However, its mechanical properties, especially its brittleness, limit its application. Therefore, in order to increase its ability to transmit stresses, it can be combined with a polymer phase, which increases its strength without eliminating the important aspect of bioactivity. Read More

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Adhesion behaviors on four special wettable surfaces: natural sources, mechanisms, fabrications and applications.

Soft Matter 2021 May;17(19):4895-4928

State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China.

The study of adhesion behaviors on solid-liquid surfaces plays an important role in scientific research and development in various fields, such as medicine, biology and agriculture. The contact angle and sliding angle of the liquid on the solid surface are commonly used to characterize and measure the wettability of a particular surface. They have a wide range of values, which results in different wettability. Read More

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Large-Volume Intrathecal Administrations: Impact on CSF Pressure and Safety Implications.

Front Neurosci 2021 14;15:604197. Epub 2021 Apr 14.

Massachusetts General Hospital, Boston, MA, United States.

The increasing number of studies demonstrates the high potency of the intrathecal (IT) route for the delivery of biopharmaceuticals to the central nervous system (CNS). Our earlier data exhibited that both the infused volume and the infusion rate can regulate the initial disposition of the administered solute within the cerebrospinal fluid (CSF). This disposition is one of key factors in defining the subsequent transport of the solute to its intended target. Read More

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