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CozyXS™ Prestained Protein Ladder - low-range (2-40 kDA) ladder for protein electrophoresis and Western blots

CozyXS™ Prestained Protein Ladder - low-range (2-40 kDA) ladder for protein electrophoresis and Western blots

Applications

  • Approximate protein molecular weight determination on denaturing gels.
  • Monitoring of electrophoresis process and Western transfer efficiency.

Benefits

  • Low-range protein ladder with 3-color bands from 2 to 40 kDa
  • Room-temperature-stable ladders, always ready to use.
  • Sharp bands, bright colors.

CozyXS™ Prestained Protein Ladder

Product information "CozyXS™ Prestained Protein Ladder "

highQu ready to use Prestained Protein Ladders are mixtures of highly recombinant proteins with coupled chromophores providing sharp protein bands and bright colors on denaturing polyacrylamide gels. The high ladder purity allows for exceptional stability and room short term temperature storage. Ladders are ready to be directly loaded on gels without any preparation or heating. They provide sharp bands for approximate protein sizing and allow for monitoring of electrophoresis process and Western transfer efficiency.

This ready to load low-range CozyXS™ Prestained Protein Ladder contains six highly purified prestained proteins in a range from 2 to 40 kDA, supplied denatured in 20 mM Tris-Phosphate (pH 7.5 at 25°C), containing SDS, Urea and DMSO.

Recommendations for use:

  • Do not heat, just thaw (if needed) and mix.
  • Load: 3- 5 μl/ gel well for electrophoresis
  • Load: 3- 5 μl/ gel well for Western transfers Gels

The ladder is separated well on 14 to 18% Tris-Tricine gels.

To separate low MW proteins on Tris-Glycine gels:

• Use 29:1 or 37.5:1 acrylamide to bisacrilamyde ratio.
• Use 15% acrylamide gel for separating small proteins
• If >15% gels are necessary, keep stacking gel layer thin (<5 mm)
• Use special gel loading tips to accurately load samples at the well bottom.
• For better stacking of small proteins, run electrophoresis at 100V for 15 min. followed by 150V for 60 minutes.

For Western transfer, use 100 V power for 90 minutes.

• For small proteins, use rather NC membranes with small pores (0.2 μm).
• Transfer Buffer: 25 mM Tris, 192 mM glycine, 25% methanol.
• Avoid SDS in transfer buffer and use methanol concentration up to 25% for better binding. Alternatively, take ethanol for binding of small proteins.
• After transfer, rinse the membrane with distilled water and proceed with blocking, washing, and incubation at 4°C.
• If further immobilization of small peptides on membrane is required, dry membranes at room temperature before blocking.
• Use Tween-20 at < 0.1% in washing and blocking buffers.

STORE
Room temp., short term (2 weeks)
+4°C, 3 months
-20°C, 12 months
Storage recommendations are just guidelines; the expiry date shall be followed.


Note:
The picture shows just guidelines for approximate protein MW estimation.
The apparent MW of each protein was determined by callibrating it against unstained protein of same size. For more precise sizing, such calibration shall be done exactly at conditions used.

 

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