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769 matches found for solvents

Perfluorosulfonic Acid Membranes for Fuel Cell and Electrolyser Applications

Deborah Jones Institut Charles Gerhardt CNRS–University of Montpellier, 34090 Montpellier, France Email: Deborah.Jones@univ-montp2.fr From PEM Fuel Cells to PFSA Membranes PFSA Polymer Types Composition, Structure, and Synthesis Routes PFSA Ionomer Dispersions Conductivity and Water Uptake Membrane ...

Isocratic Elution of Analytes Differing Significantly in Polarity on Discovery® HS F5

Dave Bell dbell@sial.com Retention and selectivity observed in chromatographic processes are the manifestation of the multiple types of interactions between the analytes and the stationary phase. Traditional alkyl phases such as C18 are designed to operate primarily by hydrophobic interactions and e...

Step-by-Step Guide for KitAlysis™ High-Throughput Photocatalysis Reaction Screening Kit

24 pre-weighed catalysts 4 degassed solvents (DCM, DCE, DMF, MeCN) Note: While the above scheme depicts a generic decarboxylative coupling reaction, High-Throughput Photocatalysis Screening Kit can be used for any photocatalytic transformation Materials Required - Set up: • 1 mylar bag from the KitA...

Investigating Matrix Interference in Analysis of Antiarrhythmic Cardiac Drugs in Plasma

For efficient therapeutic drug monitoring, it is important for clinicians to have access to fast and robust analytical methods for accurate assessment of drug efficacy. Industrial trends toward highly specific LC/MS applications over traditional immunoassay have resulted in the need for high-speed c...

Schlenk Accessories

Introduction • Typical Operations • Accessories Schlenk-Type Glassware Product Accesories On this page: Deoxygenation apparatus • Schlaker Reaction Tubes • Firestone valve Deoxygenation apparatus One-piece condenser/flask unit for degassing solvents. Flask has angled Standard Taper joint and 7mm gas...

Solubility enhancement using PEG-polyester diblock copolymers for drug delivery

One of the common difficulties with intravenous drug delivery is low solubility of the drug. The requirement for large quantities of saline to dissolve such materials limits their clinical use, and one solution for this problem that has recently generated interest is the formation of drug-loaded mic...

Analysis of Human Plasma Lipids Using sub-2 μm C18 UHPLC Column with MS Detection

Related Articles • Reporter US Volume 34.4 • Robustness of the Discovery® HS F5 HPLC Column in the Study of Metabolomics • Reaching the “Peak” of Recovery: Improving Antibody Separations with the Inclusion of Organic Alcohols • Rapid Determination of Protein Binding Affinity Using Solid Phase Microe...

Medium (5,6,7) Ring-Closing Metathesis Procedure

6 pre-weighed catalysts (x4) 4 degassed solvents: Chlorobenzene (ClPh), Toluene (PhMe), Isopropyl Acetate (i-PrOAc), and Methyl-THF (Me-THF) 1 (optional) acid additive (degassed neat TFA) • 1 mylar (foil) bag from the KitAlysis Grubbs Metathesis Reaction Screening Kit and you will use the following ...

Tips for Optimizing Immunofluorescence Protocols to Get the Best Image

Related Links • Antibody Explorer: Search primary and secondary antibodies • Prestige Antibodies • Antibody Resource Center Uses for immunofluorescence (IF)—where an antibody is conjugated to a molecule that fluoresces when excited by lasers— include protein localization, confirmation of post-transl...

Hexafluoroalcohol-functionalized Methacrylate Monomers for Lithographic/Nanopatterning Materials

• • Download PDF • IBM Almaden Research Center, San Jose, CA *Email: dipietro@almaden.ibm.com To keep pace with Moore's Law, there is a continuing need in the semiconductor industry to achieve higher circuit density in microelectronic devices. The principle means of defining high resolution circuitr...

Avanti® FAQ

Drug Delivery / Pharmaceutical Applications • What are the differences between (advantages of) synthetic and natural phospholipids? • What are the advantages/disadvantages of including cholesterol in my liposomes? • How do I get my hydrophobic drug in the lipid membrane? • What issues should I consi...

Schlenk Operations - Glasssware Catalog - Schlenk Glassware Operations -Air-Sensitive Glassware

Introduction • Typical Operations • Accessories Schlenk-Type Glassware Product Accessories On this page: Addition of Liquids • Chemical Reaction • Distillation • Drying/Evaporation •Extraction and Filtration • Filtration/Recrystallization • Filtration/Washing/Degassing •Filtration/Washing • Transfer...

Distillation Traps - Sigma-Aldrich Glassware Catalog

Apparatus • Columns • Packing • Heads • Traps Dean-Stark Traps • Cold-Traps & Vacuum Traps On this page: Dean-Stark traps • Jacketed Dean-Stark trap • Modified Dean-Stark apparatus Modified, jacketed Dean-Stark trap • "N"-tubes Dean-Stark traps Designed specifically for azeotropic distillation using...

Poly(Amino Acid) Block Copolymers for Drug Delivery and other Biomedical Applications

Carmen Scholz Department of Chemistry, University of Alabama in Huntsville Huntsville, AL 35899 Email: scholzc@uah.edu Humankind has utilized protein materials throughout its existence, starting with the use of materials such as wool and silk for warmth and protection from the elements and continuin...

FITC-labelled polysaccharides

FITC-Dextran FITC-DEAE-dextran (FDD) FITC-carboxymethyl-dextran (FCM-Dextran) FITC-polysucrose (FITC-Ficoll®) FITC-DEAE-polysucrose FITC-CM-polysucrose (FITC-CM-Ficoll®) FITC-inulin Fluorescein hyaluronic acid (FHA-Se) TRITC-labelled polysaccharides TRITC-polysucrose (TRITC-Ficoll®) Tetramethyl-rhod...

Products for the Petrochemical Industry

The oil industry accelerates the global economy by meeting the demand for petroleum, natural gas, biofuels and petrochemicals. Its success depends upon safe, reliable and efficient processes to ensure that consumers receive a consistent flow of high-quality products. At Sigma-Aldrich, we are here to...

RAFT Evaluation

Jeremy Bartels, Sebastian Grajales, Kaushik Patel, Kanth V. B. Josyula, Gangadhar Panambur and Scott Batcheller MilliporeSigma, 6000 N. Teutonia Ave. Milwaukee, WI 53209 RAFT polymerization process In 1998, members of an Australian Commonwealth Scientific and Research Organization (CSIRO) team disco...

Solubilization of Membrane Proteins

Related Links • Cell disruption and membrane preparation • Conditioning Purified Membrane Proteins • Performing a purification and on-column refolding of an insoluble histidine-tagged protein from a 100 ml E. coli culture using HisTrap FF 1 ml with ÄKTAprime plus • Performing a purity and homogeneity...

Poly(N-isopropylacrylamide)-based Smart Surfaces for Cell Sheet Tissue Engineering

• • Download PDF • Masamichi Nakayama,1 Teruo Okano,1* and Françoise M. Winnik2** 1 Institute of Advanced Biomedical Engineering and Science, Tokyo Women's Medical University (TWIns), Kawada-cho 8-1, Shinjuku, Tokyo 162-8666, Japan 2 Department of Chemistry and Faculty of Pharmacy, University of Mon...

Scale-Up Guide: Photocatalysis Reaction

To best enable scale-up success, the use of glove box is highly recommended. However, modified bench top techniques are provided below. General Guidelines for Reaction Scale-Up • Oven dry all glassware and stir bars • Preheat oil bath to avoid temperature spiking • Use dry, high purity reagents (and...

TRI Reagent® Protocol

Product No. T9424 Sample Preparation 1A. Tissue: Homogenize tissue samples in TRI Reagent (1 ml per 50–100 mg of tissue) in a Polytron® or other appropriate homogenizer. Note: If minimal shearing of the DNA is desired, use a loosely fitting homogenizer, not a Polytron (see DNA Isolation, step 3, not...

Frequently Asked Questions - radiello® Products

On this page: • General • Diffusive Bodies • RAD170 for Hydrogen Sulfide • RAD145 for BTEX/VOCs • RAD130 for BTEX/VOCs See Also: • What is passive diffusive sampling? • What is radiello®? • How to use radiello® • Applications What is the purpose of the recommended extra storage tubes? The extra stor...

High-Throughput Kits for Cholesterol and Fatty Acid Extractions

Our Fatty Acid Extraction Kit and Cholesterol Extraction Kit offer a patent-pending, chemically-modified filter that enables the isolation of compounds such as lipids (including fatty acids) and sterols (including cholesterol). Our new kit method is simpler, faster, more accurate and less costly tha...

How to Choose a Capillary GC Column

An optimized chromatographic separation begins with the column. The selection of the proper capillary column for any application should be based on four significant factors: stationary phase, column I.D., film thickness, and column length. The practical effects of these factors on the performance of...

Rh2(esp)2 Catalyst

By substituting tetramethylated m-benzenediproprionic acid 1 via a decarboxylative metathesis of Rh2(OAc)4 (Scheme 1), the Du Bois group at Stanford has improved the catalytic performance of Rh with respect to the oxidative C–H activation of sulfamate, sulfamide, carbamate, urea, and guanidine subst...

Alkali Silica Gels

Alkali metals have long been used in synthetic chemistry as reducing agents, but their pyrophoric nature has often prevented their use in larger-scale reactions. Alkali metals react violently with water, produce copious amounts of hydrogen gas that can ignite, and result in strongly alkaline solutio...

Quality Reference Standards for Monitoring Nitrosamine Contaminants

Vicki Yearick vicki.yearick@sial.com Nitrosamines are commonly occurring organic chemicals that pose a serious health threat to humans. They are easily formed by the reaction of an amine and a nitrosating agent such as nitrites, nitrogen oxides or nitrous acids. Laboratory studies have demonstrated ...

Nájera Catalysts

Aldrich ChemFiles 2007, 7.5, 6. Oxime-derived palladacycles 3 and 4 (Figure 2) introduced by Professor Carmen Nájera and co-workers at the Universidad de Alicante (Alicante, Spain) are very efficient phosphine-free precatalysts for a variety of C–C bond-forming processes.4 They are thermally robust ...

Karl Fisher Titration, Petroleum and Unique Selectivity, Ionic Liquid GC

2018 Gulf Coast Conference Essentials Were you unable to attend the Gulf Coast Conference? The weather back in January 2018 certainly did not make it easy. For those that couldn’t make it, we’d like to make the posters and training materials from the conference available to you. Training Session on ...

New Lab Start-Up Product Savings

Sigma-Aldrich New Lab Start-Up Program – Product Savings With the Sigma-Aldrich New Lab Start Up Program, you will receive: Savings on Essential Life Science Products Cell Culture Discounts (up to) Liquid Media* 50%* Powdered Media 20% Antibiotics 15% Growth Factors 10% Reagents 20% PCR Reagents Dis...