Sample Analysis



Contract Lab Services

Wyatt Technology offers contract research services and consulting in the areas of macromolecular characterization. A summary of just some of the service that we provide are listed below:

I. SEC-MALS(-QELS) analysis at ambient temperature

The customer needs to fill out the Sample Analysis Questionnaire provided by WTE. SEC conditions are required. We also recommend that the customer provide his own columns for the SEC-MALS(-QELS) measurements. Standard solvents are toluene, THF, and aqueous buffers. Alternate solvents may be used if safety and WTE facilities permit. Please note that MALS detection can also be added to other types of chromatography, such as RPC, EIC, and HIC.
Analysis includes:

  • Chromatograms from the SEC-MALS analysis
  • Number, weight, and z-average molar mass
  • Z-average rms radius and hydrodynamic radius (when applicable)
  • Polydispersity, differential and cumulative molar mass distributions
  • Conformation and branching (when applicable)
  • dn/dc determination (either measured by Optilab refractometer or taken from literature)

II. Batch light scattering analysis using Zimm-plot techniques

The customer needs to fill out the Sample Analysis Questionnaire provided by WTE. The customer must specify experimental conditions such as sample concentration, solubility, solvent, etc. Standard solvents are toluene, THF and aqueous buffers. Alternate solvents may be used if safety and WTE facilities permit.

Results includes:

  • Weight average molecular weight
  • Z-average rms radius (when applicable)
  • Second virial coefficient
  • Dn/dc determination

Measurement of dn/dc only

Standard solvents are toluene, THF and aqueous buffers. The sample provided must be 100% pure.

Analysis:

  • dn/dc measurement from at least four concentrations