| | | | | | | | Making a Great Connection
| | | By
John V. Hinshaw
| | | Gas chromatographs contain a large number and variety of fittings, ferrules, tubing, and connections, all of which must be properly assembled, tightened, and leak-free if the system is to perform at its best. This month, John Hinshaw discusses how to make, maintain, and troubleshoot various types of connections used in gas chromatographs.
| |
| | | | Products
| | | Agilent's 1200 series HPLC system is designed with more than 60 instrument modules and can be configured for standard, nanoflow, capillary, narrow, prep-scale, and chip-based liquid chromatography. The system reportedly is compatible with the company's 1100 series and is available in a Rapid Resolution configuration featuring more than 70 new RRHT columns. Agilent Technologies, Inc., Palo Alto, CA.
| |
| | | | Modern Techniques for the Extraction of Solid Materials — An Update
| | | By
Ronald E. Majors
| | | Traditional methods for the sample preparation of insoluble solid materials have represented one of the more time consuming and labor intensive efforts in analysis. In this installment of "Sample Prep Perspectives," Ron Majors examines modern sample preparation methods for solids that often involve increased temperature and higher pressure to speed up the extraction process. In addition, modern sample preparation methods have been automated to relieve analysts of the drudgery associated with traditional methods. Here, he reports on automated Soxhlet extraction, supercritical fluid extraction, pressurized fluid extraction–accelerated solvent extraction, and microwave-assisted extraction and updates earlier coverage.
| |
| | | | Simultaneous Determination of Positive and Negative Counterions Using a Hydrophilic Interaction Chromatography Method
| | | By
Donald S. Risley
,
Brian W. Pack
| | | The objective of this work was to develop a universal high performance liquid chromatography method that is capable of simultaneously retaining and separating both cations and anions within a single chromatographic analysis for the purpose of quantification in pharmaceutical products. A zwitterionic stationary phase operated in the hydrophilic interaction chromatography (HILIC) mode in conjunction with evaporative light scattering detection was investigated for the separation and quantitation of 33 commonly used pharmaceutical counter ions, 12 cations, and 21 anions. Using a single gradient chromatographic analysis, both anions and cations were easily separated from each other in addition the parent pharmaceutical molecules also were separated.
| |
| | | | | | | Eluent synthesizer
| | | Metrohm-Peaks Metrohm 845 eluent synthesizer is designed to automatically prepare certified GLP-compliant eluents, mobile phases, buffer solutions, standards, and dilutions with precise mixtures and batch-to-batch reproducibility. The instrument reportedly can handle aqueous solutions, acidic or basic buffers, and organic mobile phases from as many as four freely selectable concentrates and one main component. Metrohm-Peak, Inc., Houston, TX.
| |
|
|
| 
Follow Us
RSS
Bookstore
Shimadzu Nexera UHPLC meets all analysis requirements with no compromise in data integrity
Polymicro Technologies, your leader in fused silica capillary tubing for chromatographic applications. Check out our technical notes the next time you have a question.
Subscribe to Varian's FREE e-newsletter and receive the latest Applications and Solutions.
Multi-Angle Light Scattering instruments for absolute macromolecular characterization
No Frills HPLC at an affordable price. D-Star has systems and detectors that are perfect for production sites and teaching labs. Variable UV-VIS, Fixed and Dual wavelength. Filter fluorescence.