SRT®, Zenix™, SRT®-C, Zenix™-C, and Nanofilm® are five SEC product lines developed based on innovative surface coating and particle technologies comprised of uniform, hydrophilic, and neutral nanometer thick films chemically bonded on 3 or 5 µm high purity and mechanically stabilized silica.

Offering unique features and benefits of each, SRT® and Zenix™ - stand-up monolayer bonded on porous silica, and SRT®-C and Zenix™-C - lay-down monolayer on porous silica offer ideal phase chemistries choices for sample type specific separation (see below comparison chart). The 3µm based Zenix™ and Zenix™-C, and 5µm based SRT® and SRT®-C allow for ultra high resolution, efficiency and performance separation.

Sepax SEC Product Family Comparison Chart

Product Line	SRT®	Zenix™	SRT®-C	Zenix™-C
Particle size	5 µm	3 µm	5 µm	3 µm
Pore size (Å)	100, 150, 300, 500, 1000 & 2000	100, 150, 300	100, 150, 300, 500, 1000 & 2000	100, 150, 300
Resolution	High	Highest, Short column for faster separation	High	Highest, Short column for faster separation
Efficiency	High	Doubled from 5µm	High	Doubled from 5µm
Selectivity	Same for SRT® and Zenix™		Same for SRT®-C and Zenix™-C
Surface structure	Chemically bonded stand-up monolayer		Chemically bonded lay-down monolayer
Recommended Sample Types	Monoclonal antibodies, proteins, peptides, nucleic acids, oligonucleotides, virus, and water-soluble polymers		"Tough samples" such as hydrophobic proteins like insulin, membrane protein monoclonal antibodies derivatized with polymer branches, e.g. polypeptide, PEG.

Nanofilm® is made with a special stationary phase - a polymeric brush coating. Such a neutral, hydrophilic polymer coating is suitable for positively charged proteins and hydrophobic proteins, such as membrane proteins.

Product Line	Nanofilm®
Particle size	5 µm
Pore size (Å)	150, 250, 450
Resolution	Fairly high
Efficiency	High
Selectivity	Same for SRT® and Zenix™
Surface structure	Chemically bonded polymeric coating
Recommended Sample Types	Highly positively charged proteins, hydrophobic proteins like membrane protein

Preparative Size Exclusion

SRT®-10 is made of uniform, hydrophilic, and neutral nanometer thick films phases chemically bonded on high purity and mechanically stabilized 10 µm silica. This product is suitable for preparative separation of biological molecules and water-soluble polymers in aqueous buffers.

Product Line	SRT®-10
Particle size	10 µm
Pore size (Å)	300, 500
Resolution	High
Efficiency	High
Selectivity	Same as SRT®
Surface structure	Chemically bonded on high purity and mechanically stabilized 10 µm silica
Recommended Sample Types	Biological molecules and water-soluble polymers in aqueous buffers