Articles by Daniela Held - Chromatography Online
Articles by Daniela Held

Daniela Held


Articles
Tips & Tricks GPC/SEC: Mobile Phase Considerations
April 8, 2014

There are many sources of advice on how to select the most appropriate stationary phase for sample analysis, but the mobile phase is not often discussed. This article provides tips for selecting the most appropriate mobile phase for your analysis.

Tips & Tricks GPC/SEC: How to Install GPC/SEC Columns
February 3, 2014

For proper column installation it is important to be familiar with column characteristics such as solvent compatibility, maximum flow rate, and maximum operating temperature.

Tips & Tricks GPC/SEC: Select the Right Columns for Your Molar Mass Range
December 11, 2013

Shoulders in gel permeation/size-exclusion chromatograms (GPC/SEC) can be a result of sample characteristics or down to the wrong choice of columns or column combinations. Proper selection helps to measure true results.

Tips & Tricks: Evaporative Light Scattering Detection in GPC/SEC
October 3, 2013

This article presents applications of ELSD in GPC/SEC. It discusses both the advantages and disadvantages as well as the practical considerations for use in GPC/SEC.

Tips & Tricks GPC/SEC:An Alternative to Calibration With Narrow Standards
August 8, 2013

Integral calibration with a broad standard is a fast, cost-effective, and easy-to-use calibration technique for quality control. This article explains more.

PSS Polymer EU - 2D Analysis for Thermoplastic Elastomers
June 12, 2013

The online combination of gradient HPLC and GPC/SEC increases peak capacity of the separations and allows to evaluate peaks which cannot be separated by either method alone.The 2D approach is the only way to determine two property distributions independently and unambiguously. A better understanding of the polymerization process and of structure - property relationships can be obtained that might help to tune products for specific applications

Molecular weight determination of Gelatin
June 12, 2013

Reproducible and easy-to-use GPC/SEC analysis for all types of Gelatins can be done usinga SECcurity GPC system and PROTEEMA columns

Tips & Tricks GPC/SEC: Analysis and Calibration for Low Molar Mass Macromolecules
June 3, 2013

GPC/SEC analysis can be easily optimized to yield improved results when analysing oligomers and low molar mass macromolecules.

Tips & Tricks: GPC/SEC Method Optimization
April 4, 2013

After developing a GPC/SEC method by selecting the optimum stationary and mobile phase an optimization of the default conditions is a good idea.

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LCGC COLUMNISTS 2014

Sample Prep Perspectives | Ronald E. Majors:

LCGC Columnist Ron Majors, established authority on new column technologies, keeps readers up-to-date with new sample preparation trends in all branches of chromatography and reviews developments in existing technology lines.

LATEST: The Role of Selectivity in Extractions: A Case Study

History of Chromatography | Industry Veterans:

With each installment of this column, a different industry veteran covers an aspect of the evolution and continued development of the science of chromatography, from its birth to its eventual growth into the high-powered industry we see today.

LATEST: Georges Guiochon: Separation Science Innovator

MS — The Practical Art| Kate Yu:
Kate Yu is the editor of 'MS-The Practical Art' bringing her expertise in the field of mass spectrometry and hyphenated techniques to the pages of LCGC. In this column she examines the mass spectrometric side of coupled liquid and gas-phase systems. Troubleshooting-style articles provide readers with invaluable advice for getting the most from their mass spectrometers.

LATEST: Mass Spectrometry for Natural Products Research: Challenges, Pitfalls, and Opportunities


LC Troubleshooting | John Dolan:

LC Troubleshooting sets about making HPLC methods easier to master. By covering the basics of liquid chromatography separations and instrumentation, John Dolan, Vice President of LC Resources and world renowned expert on HPLC, is able to highlight common problems and provide remedies for them.

LATEST: LC Method Scaling, Part I: Isocratic Separations

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