Data Analysis

Concerning disparity between measurements and decisions.

The molecular weight, molecular weight distribution and size of two common polymers are measured using SEC-MALS 20. Results from SEC-MALS and conventional calibration are compared and discussed.

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

Usually, PLA and PLGA are based on monomers from renewable sources, so are considered “green” polymers. By selecting different molecular weights, different ratios of lactic:glycolic acid and different molecular structures, some properties such as degradation or drug release rates can be tailored to meet application needs. GPC/SEC analysis is an ideal tool for monitoring samples during material synthesis, production of parts and in degradation studies.

This application note will describe the analysis of a series of dextran samples ranging in molecular weight from about 1 – 650 kDa. Structural comparisons to other polysaccharides, gum arabic and pectin are presented. Initially discovered by Louis Pasteur in 1861, dextran is a polysaccharide that has found a variety of applications, primarily in the medical field, due to its minimal side-effects and solubility in aqueous media.

When it comes to measuring drugs in biological samples, what is needed, what is quantifiable – and what role should analytical scientists really be playing?

Can R&D organizations really afford to kill off analytical data that could be used for future decision-making? Perhaps it’s time to breathe life back into analytical data environments.

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.

In this report, we illustrate the utility of calorimetry in making better laboratory decisions. Examples will include improved protein construct selection for scale-up; direct measurement of the effects of mutations and post-translational modifications on protein stability; rapid optimization of solvent formulation; direct measurement of substrate and inhibitor binding affinity; determination of the mode of inhibitor binding; characterization of protein-protein interactions; and improved structural biology efficiency, when used in conjunction of other biophysical methods.