Agilent Manuals

This application note introduces a SEC method for the analysis of food-grade gelatins. Using Agilent PL aquagel-OH MIXED-H 8 µm columns, a wide molecular weight range can be analyzed with excellent resolution. This method simplifies the analysis of molecular weight distributions of water soluble polymers with intermediate to high molecular weight.

This application note describes a water-based SEC method for the qualitative and quantitative analysis of food flavorings. The method uses Agilent PL aquagel-OH 30 8µm columns with RI detection in a pH 7 buffer. The method is suitable for the analysis of analytes with neutral, ionic, and hydrophobic moieties, either singly or in combination.

Describes a method for analyzing star-branched polyethylene glycol. This method can be used with aqueous SEC.

This article introduces a use of SEC to analyze water soluble polymers in denture adhesives

Polyacrylic acid is a biodegradable water soluble polymer with numerous industrial applications, including as a super adsorbent (eg in disposable nappies), in water treatment as a metal ion scavenger and in the treatment of metal surfaces prior to coating. The molecular weight distribution (MWD) of this material is an important parameter, as it strongly affects its end use properties. Aqueous SEC is an ideal analytical tool for the measurement of the MWD of polyacrylic acid. Since polyacrylic acid is a polyelectrolyte, care must be taken in selecting the appropriate SEC conditions. In the method described below, a buffered mobile phase with a high electrolyte content was used to minimize non-size exclusion effects. Agilent PL aquagel-OH MIXED 8 µm columns were selected to provide good resolution over a wide molecular weight range. Column calibration was achieved using Agilent EasiVial PEG/PEO standards see Figure 1. EasiVials provide a rapid and convenient means of constructing an aqueous SEC column calibration curve over a wide molecular weight range (typically 100 to 1,200,000 g/mol). Each vial contains a mixture of four individual, highly characterized, narrow dispersity standards. The amount of each individual standard is carefully controlled during manufacture, allowing their use in SEC-viscometry, which requires accurate concentrations. Refractive index chromatograms obtained from each E

This application note discusses the characteristics of block copolymers synthesized via transition metal mediated living radical polymerization. These reactions allow for controlled synthesis of polymers with predetermined molecular weight, polydispersity, and well-defined architecture using cheap and simple procedures. The ability to convert hydroxyl functional groups to active initiator groups enables the synthesis of architecturally diverse materials such as stars, blocks, and grafts. Block copolymers consist of two or more chains with different repeat units, known as blocks. For example, a block of polystyrene connected to a block of polymethy...

This application note describes a loading study performed on EnviroPrep columns to investigate the effect of sample concentration on-column on peak shape.

This note describes the use of alternative solvents for sample clean-up with Agilent EnviroPrep columns to replace the toxic dichloromethane. Several solvent mixtures were investigated for use with EnviroPrep columns, and the effect of the eluent on the elution of the standard test mixture described in the EPA methodology is described.

This article introduces the GPC analysis method and results of polybutadienes. Polybutadienes are a type of synthetic rubber commonly used in the production of tires and car parts due to their high temperature and wear resistance. Triple detection GPC method is employed to assess the molecular weight distribution and molecular structure of polymers without relying on column calibrations. This is important for analyzing complex materials.

This application note describes the use of the Agilent PL-GPC 50 high-performance liquid chromatography/molecular weight characterization system to analyze the molecular weight distribution of polyisobornyl methacrylate in tetrahydrofuran. Polyisobornyl methacrylate is a high-melting, heat-resistant thermoplastic polymer used in the manufacture of paints, adhesives, sealants, lubricants and oil-based coatings.

This article describes a method for separating trichlorobenzene from fish using Agilent EcoSpheres. EcoSpheres are a novel type of gel beads that have a unique structure and chemical composition that allows them to capture and separate organic contaminants. EcoSpheres have excellent performance and can effectively separate trichlorobenzene. The method is simple and easy to use and can be widely applied to the analysis of trichlorobenzene in environmental samples.

This article introduces the GPC viscosity method of linear and branched polyethylene glycol

10 mm seven segment displays have industry standard size, industry standard pinout, a variety of colors, excellent appearance, design flexibility and other features

This data sheet provides specifications of the 18:88 and 88:88 0.56 inch four digit seven segment displays, including appearance, color, size, etc.