New England Biolabs, S1421S, Hydrophilic Streptavidin Magnetic Beads

Hydrophilic Streptavidin Magnetic Beads are 2-3 µm superparamagnetic particles covalently coupled to a highly pure form of streptavidin. The beads can be used to capture biotin labeled substrates including antigens, antibodies and nucleic acids. Related Categories DNA Methylation Analysis,, RNA Modification Specification Storage Buffer 0.1% BSA 0.05% Tween® 20 0.05% NaN3 1X PBS pH 7.4 @ 25°C Support Matrix 2 µM non-porous superparamagnetic microparticles Binding Capacity The beads will bind greater than 800 pmol of free biotin per mg and greater then 400 pmol of single-stranded 25 bp biotinylated oligonucleotide per mg. FAQ Q: What is the difference between S1420 and S1421? A: S1420 Streptavidin Magnetic Beads are based on a 1 um carboxylate modified bead, they have very high binding capacity and low non-specific binding for proteins. S1421 Hydrophilic Streptavidin Magnetic Beads are based on a 2-3 um bead and gave lower binding capacity than S1420. S1421 has low non-specific binding for nucleic acid and are recommended for nucleic acid isolation applications. Q: Do I need to block the beads or are they pre-blocked? A: The beads are provided with 0.1% Recombinant Albumin in the storage buffer so you do not need to block them.