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Guide on our SEC-MALS SEC-MALS is short for size-exclusion chromatography-multi-angle-light scattering. Our setup is designed for analytical scale analysis of your purified proteins to obtain information on properties like oligomeric state and aggregation. Our setup is composed of a Dionex HPLC that consists of a pump, autosampler, multiwavelength DAD that is coupled to a 3-angle MALS detector from Wyatt. This setup allows for the separation on-column by size exclusion followed by detection via UV and MALS. More background on MALS can be found here in the attached documents.
Overview of a SEC-MALS run (11.11.21 KL) Start-up From a off state: Turn on:
When you come lines A, B and C should always be in 20% Ethanol. Line D should be in water or in 20% Ethanol. The extra bottle is the pump wash. This should also be in 20% ethanol MOST IMPORTANT THING ALL BUFFERS NEED TO BE FILTERED 0.1 um. First filter 0.45 um then 0.1 um. Buffers last maximum 2 days, and then need to be refiltered. Unfiltered buffers will clog the detectors. Recommended buffers are 1X PBS or 150 mM NaCl, 10 mM HEPES 7.5. Any other buffers please ask first. Water can be taken directly from the MQ machine. This has already been filtered through the pod.
Turn on the Chromeleon program. This is the program that controls the HPLC.
Pump purge
Equilibrate the column
Turning on UV detector and MALS detector
Starting a run
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