Precise molecular weight determination

⇤ NEWS | 29th May 2025

TESTA Analytical announce the LS Assistant - a new accessory for Multiangle Light Scattering (MALS) instruments that delivers accurate and reliable specific refractive index (dn/dc) values - a key parameter for precise molecular weight determination of macromolecules.

Designed with user convenience in mind, operating the LS Assistant is highly intuitive with minimal training required. The system design provides 100% sample recovery, allowing valuable samples to be recollected for further analysis. The LS Assistant is compatible with virtually any solvent and comes equipped with a precise temperature control unit, which ensures stable measurement conditions across a wide range of applications. Whether for polymer, protein, or nanoparticle analysis, it is an irreplaceable tool in advanced macromolecular characterization, complementing goniometers, light scattering instruments and GPC systems.

The LS Assistant is a versatile accessory designed for both concentration and dn/dc value determination. The integrated software enables rapid and accurate determination of dn/dc values of dissolved samples in just minutes. When the dn/dc value of a sample is known the LS Assistant will then accurately determine the concentration of your sample.

Available in a choice of different models the LS Assistant can be precisely matched to the operating wavelength of your light scattering instrument. Wavelength matching represents a major advance in accurate determination of molecular weight using dn/dc values.

To learn more about the LS Assistant please visit https://testa-analytical.com/ls-assistant.html.

Click here to contact Testa Analytical Solutions (+49-30-864-24076).