PageRuler Unstained High Range and NIR Protein Ladders

Thermo Fisher Scientific Adds New Protein Ladders for Accurate Molecular Weight Determination after Gel Electrophoresis

By Douglas Hayworth

A broad-range MW marker for near-infrared (NIR) fluorescence applications and an unstained MW marker especially for high-molecular weight proteins.


Media Contact Information:
Name: Tracy Cartier
Phone: 978-905-1201

Technical Contact:
Name: Steve Shiflett
Phone: +1 815-968-0747


ROCKFORD, Ill. (January 16, 2012) – Thermo Fisher Scientific, the world leader in serving science, today announced the addition of two new protein molecular weight markers for determining the size of proteins in gel electrophoresis and Western blotting applications. The ready-to-use Thermo Scientific™ PageRuler™ NIR Protein Ladder contains a mixture of 10 proteins ranging from 11K to 250K. After SDS protein gel electrophoresis or Western blot transfer to a membrane, the protein bands of the marker can be easily visualized using a fluorescent detection instrument, eliminating the need to overlay pre-stained markers. For easy reference, the 55K protein band has greater intensity than the other ladder bands.

The Thermo Scientific™ PageRuler™ Unstained High Range Protein Ladder is a mix of eight purified recombinant proteins ranging from 60K to 250K. The ladder is ready to use without heating and diluting. It is easily detected after denaturing protein gel electrophoresis with either coomassie or silver stains, and it can be detected in Western blots with protein stains. The 150K band of the ladder has greater intensity for easy orientation.

For more information about the new PageRuler NIR Protein Ladder and the PageRuler Unstained High Range Protein Ladder products, please visit


About Thermo Fisher Scientific

Thermo Fisher Scientific Inc. is the world leader in serving science. Our mission is to enable our customers to make the world healthier, cleaner and safer. With revenues of nearly $11 billion, we have approximately 37,000 employees and serve customers within pharmaceutical and biotech companies, hospitals and clinical diagnostic labs, universities, research institutions and government agencies, as well as in environmental and process control industries. We create value for our key stakeholders through two premier brands, Thermo Scientific and Fisher Scientific, which offer a unique combination of continuous technology development and the most convenient purchasing options. Our products and services help accelerate the pace of scientific discovery, and solve analytical challenges ranging from complex research to routine testing to field applications. Visit

Featured Products:

PageRuler Unstained High Range Protein Ladder

PageRuler Unstained High Range Protein Ladder

PageRuler Prestained NIR Protein Ladder

PageRuler Prestained NIR Protein Ladder