Sample Preparation

This application note describes the analyses of a variety of aqueous (water-soluble) cellulose derivatives using the OMNISEC triple detection system and the subtle, yet distinct differences between these different derivatives that can be parsed out by the OMNISEC system

In this application note, molecular weight data from the Viscotek SEC-MALS 20 is combined with measurements of Rg and IV to study the structure of different polysaccharides including pullulan, dextran, hydroxypropyl cellulose (HPC), pectin and gum Arabic. The differences between conformation and Mark-Houwink plots are also studied.

The investigative power of multiple detectors. Here, we describe the analysis of a semi-purified protein mixture containing β-amylase. Step-by-step, we show how different properties of the proteins elicit a specific response in each detector and how coupling this data can be qualitatively and quantitatively evaluated.

Researchers use SPME and GC-MS to puncture claims that banned tire treatments are “undetectable”

Learn why isothermal titration calorimetry is a method of choice for accurate and precise determination of critical micellar concentration of surfactants for biochemical applications and find out how to analyse demicellization data from Isothermal Titration Calorimetry

In water analysis, direct injection of samples into your LC-MS/MS system (without sample preparation beyond filtration) is possible because of advances in instrumentation. However, matrix effects must be monitored carefully – and sometimes may even prove useful.

To formulate successfully with HA it is essential to understand the impact of factors such as molecular weight, molecular structure, concentration and degree of cross-linking on rheological characteristics such as viscoelasticity which are directly linked to aspects of product performance. Linking structural characteristics to product performance, via rheological properties, supports smart, fast, and effective formulation. The following study shows how rheology and particle size measurements can be used to characterize the physical properties of HA dermal fillers.

Polyol-induced increases in thermal stability of antibodies. See how Differential scanning calorimetry can be used to assess the effects of polyol excipients on antibodies. DSC was used to monitor polyol-induced increases in thermal stability across seven monoclonal antibodies. The increases in thermal stability were measured as a function of polyol concentration and orientation of hydroxyl groups. It was found that increases in thermal stability were linear with respect to alcohol concentration.

See how you can use DSC to save you money in your contract development lab. This paper provides an overview of the workflow typically associated with preformulation projects at a contract development organization as well as provides a general framework for conducting preformulation studies that leverages the application of biophysical techniques such as DSC and traditional analytics by employing statistical design. A case study involving the formulation development of a monoclonal antibody is presented to detail the utility and potential limitations of DSC in support of preformulation for a variety of protein products.

This four-part series examines common issues and questions surrounding the principles, measurements and analysis of DLS data and discusses how to minimize the time required for and increase the accuracy of acquiring and interpreting DLS data during the biotherapeutic development process. In Part Four, we address frequently asked questions related to the application of DLS to the characterization of protein therapeutic formulations.