USP HPLC Packings – Eprogen (SynChropak)

Compendial methods often specify a USP packing code (L-code). Below are the Eprogen (SynChropak) columns corresponding to the listed USP codes (source: your provided USP HPLC packings PDF).

USP L1 – Reversed Phase C18

Octadecylsilane chemically bonded to porous or non-porous silica/ceramic particles (typ. 1.5–10 µm) or monolithic silica.

USP Packing Brand Name (Eprogen) Manufacturer
L1SynChropak RPPEprogen, Inc.
L1SynChropak RPP-1000Eprogen, Inc.
L1SynChropak RPP-4000Eprogen, Inc.
L1SynChropak RPP-100Eprogen, Inc.
L1SynChropak RPS-100Eprogen, Inc.

USP L7 – Reversed Phase C8

Octylsilane chemically bonded to silica particles.

USP Packing Brand Name (Eprogen) Manufacturer
L7SynChropak RP8Eprogen, Inc.
L7SynChropak RP8-1000Eprogen, Inc.

USP L14 – Strong Anion Exchange (SAX)

Silica gel with a chemically bonded strongly basic quaternary ammonium anion‑exchange coating (typ. 5–10 µm).

USP Packing Brand Name (Eprogen) Manufacturer
L14SynChropak Q300Eprogen, Inc.

USP L20 – Diol Phase

Dihydroxypropane groups chemically bonded to porous silica or hybrid particles (typ. 1.5–10 µm) or monolithic silica.

USP Packing Brand Name (Eprogen) Manufacturer
L20SynChropak GPCPEPEprogen, Inc.
L20SynChropak GPC series 100, 300, 500Eprogen, Inc.

USP L26 – Reversed Phase C4 (Butyl)

Butylsilane chemically bonded to totally porous silica particles (typ. 1.5–10 µm).

USP Packing Brand Name (Eprogen) Manufacturer
L26SynChropak RP4, RP4-1000, RP4-4000Eprogen, Inc.

USP L33 – Size Exclusion (SEC) for Dextrans

Packing capable of separating dextrans by molecular size over ~4,000–500,000 Da.

USP Packing Brand Name (Eprogen) Manufacturer
L33SynChropak GPC LinearEprogen, Inc.
L33SynChropak GPC series 100, 300, 500, 1000, 4000Eprogen, Inc.

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