National Chromatography Inco
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Ultimasyil Phenyl 120A
“Ultimasyil” (or “Ultimasyil / Ultimasyil Phenyl”) is a column brand / product line (from NCI / NCIN) offering phenyl‑bonded reversed phase columns.
The “120A” means the pore size of the silica support is about 120 Å (angstroms).
In the Ultimasyil Phenyl product list, 120A is one option (alongside 80A, 100A, 200A).
Phenyl columns generally belong to the reversed phase family, but with π–π interactions (aromatic stacking) as an additional retention mechanism, giving different selectivity compared to purely alkyl (C8, C18) phases.
Key Properties / Specifications (typical for phenyl‑bonded 120 Å columns)
While I couldn’t find a full manufacturer spec sheet specifically for “Ultimasyil Phenyl 120A” in all respects, extrapolating from general phenyl 120A columns and from Ultimasyil product line, common features are:
| Property | Typical / Expected Value |
|---|---|
| Pore size | 120 Å |
| Bonding / stationary phase | Phenyl (aromatic) moieties bonded to silica |
| Mode | Reversed Phase |
| Selectivity | Useful for aromatic analytes (π–π interactions) in addition to hydrophobic interactions |
| pH stability | Usually in the acidic to mildly basic range (often pH 1–10 or narrower, depending on bonding and endcapping) |
| Compatibility with aqueous mobile phases | Good, many phenyl phases are designed to work with high‑water content mobile phases |
| Endcapping / shielding silanols | Usually endcapped to improve peak shape, reduce tailing (especially for polar or basic analytes) |
| Selectivity differences vs C18 / C8 | Phenyl columns tend to have different retention behavior, sometimes better for aromatic / π‑rich compounds, sometimes less retention for purely nonpolar compounds |
