Molecular mass analysis of lipopeptide by Static light scattering (SLS) (CAT#: STEM-MB-0595-WXH)

Introduction

A lipopeptide is a molecule consisting of a lipid connected to a peptide. They are able to self-assemble into different structures. Many bacteria produced these molecules as a part of their metabolism, especially those of the genus Bacillus, Pseudomonas and Streptomyces. Certain lipopeptides are used as antibiotics.

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Principle Applications Procedure Materials

Principle

Static light scattering is a technique in physical chemistry that measures the intensity of the scattered light to obtain the average molecular weight Mw of a macromolecule like a polymer or a protein in solution. Measurement of the scattering intensity at many angles allows calculation of the root mean square radius, also called the radius of gyration Rg. By measuring the scattering intensity for many samples of various concentrations, the second virial coefficient, A2, can be calculated.

Applications

The main applications of static light scattering is molecular mass determination of macromolecules, such as proteins and polymers, as it is possible to measure the molecular mass of proteins without any assumption about their shape.

Procedure

1. Sample preparation
2. Measurement by SLS instrument
3. Data analysis

Materials

• Right-Angle Light Scattering (RALS) Detector
• Low-Angle Light Scattering (LALS) Detector
• Hybrid RALS/LALS Detector
• Multi-Angle Light Scattering (MALS) Detector

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