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Pharmacopoeia
Pharmacopoeial reference and column selection
United States Pharmacopeia–National Formulary（USP–NF）
The USP uses a distinctive "L-number" system to specify HPLC packings (L1 = C18, for example). It specifies the code, not the brand, so any column meeting that definition may be used — which is the basis for the selection table on this page.
Visit the USP site ↗Pharmacopoeia of the People's Republic of China
Divided into four parts: traditional Chinese medicine, chemical drugs, biological products and general chapters. Chromatographic conditions describe the stationary phase in words ("octadecylsilane bonded silica", for example) rather than using a code system, so the column type must be matched from the description.
Visit the Chinese Pharmacopoeia Commission site ↗European Pharmacopoeia（Ph. Eur.）
Legally adopted by 38 member states and the EU, and legally binding. Stationary phases are specified by general description together with system suitability requirements, forming the quality baseline for EU market access.
Visit the EDQM site ↗Japanese Pharmacopoeia (日本薬局方)
Together with USP and EP, a member of the Pharmacopoeial Discussion Group (PDG) under ICH, with general test methods being progressively harmonized. Chromatographic conditions describe the stationary phase in words, so the selection logic resembles that of ChP.
| Code | USP definition |
|---|---|
| L1 | Octadecyl silane chemically bonded to porous or nonporous silica particles, superficially porous particles, or ceramic microparticles, 1.5–10 μm in diameter, or a monolithic silica rod. |
| L2 | Octadecyl silane chemically bonded to silica gel of a controlled surface porosity that has been bonded to a solid spherical core, 30 to 50 μm in diameter. |
| L3 | Porous silica particles or superficially porous particles, 1.5–10 μm in diameter, or a monolithic silica rod. |
| L4 | Silica gel of controlled surface porosity bonded to a solid spherical core, 30 to 50 μm in diameter. |
| L5 | Alumina of controlled surface porosity bonded to a solid spherical core, 30 to 50 μm in diameter. |
| L6 | Strong cation-exchange packing–sulfonated fluorocarbon polymer coated on a solid spherical core, 30 to 50 μm in diameter. |
| L7 | Octylsilane chemically bonded to totally porous or superficially porous silica particles, 1.5–10 μm in diameter, or a monolithic silica rod. |
| L8 | An essentially monomolecular layer of aminopropylsilane chemically bonded to totally porous silica gel support, 1.5–10 μm in diameter, or a monolithic silica rod. |
| L9 | Irregular or spherical, totally porous silica gel having a chemically bonded, strongly acidic cation-exchange coating, 3 to 10 μm in diameter. |
| L10 | Nitrile groups chemically bonded to porous silica particles or superficially porous particles, 1.5–10 μm in diameter, or a monolithic silica rod. |
| L11 | Phenyl groups chemically bonded to porous or superficially porous silica particles, 1.5–10 μm in diameter, or a monolithic silica rod. |
| L12 | A strong anion-exchange packing made by chemically bonding a quaternary amine to a solid silica spherical core, 30 to 50 μm in diameter. |
| L13 | Trimethylsilane chemically bonded to porous silica particles, 3 to 10 μm in diameter. |
| L14 | Silica gel having a chemically bonded, strongly basic quaternary ammonium anion-exchange coating, 5 to 10 μm in diameter. |
| L15 | Hexylsilane chemically bonded to totally porous silica particles, 3 to 10 μm in diameter. |
| L16 | Dimethylsilane chemically bonded to porous silica particles, 5 to 10 μm in diameter. |
| L17 | Strong cation-exchange resin consisting of sulfonated cross-linked styrene–divinylbenzene copolymer in the hydrogen form, 6 to 12 μm in diameter. |
| L18 | Amino and cyano groups chemically bonded to porous silica particles, 3 to 10 μm in diameter. |
| L19 | Strong cation-exchange resin consisting of sulfonated cross-linked styrene-divinylbenzene copolymer in the calcium form, 5–15 μm in diameter. |
| L20 | Dihydroxypropane groups chemically bonded to porous silica or hybrid particles, 1.5–10 μm in diameter, or a monolithic silica rod. |
| L21 | A rigid, spherical styrenedivinylbenzene copolymer 3 to 30 μm in diameter. |
| L22 | A cation-exchange resin made of porous polystyrene gel with sulfonic acid groups, 5–15 μm in diameter. |
| L23 | An anion-exchange resin made of porous polymethacrylate or polyacrylate gel with quaternary ammonium groups, 7–12 μm in size. |
| L24 | Polyvinylalcohol chemically bonded to porous silica particle, 5 μm in diameter. [Note—Available as YMC-Pack PVA-SIL manufactured by YMC Co., Ltd. and distributed by Waters Corp. (www.waters.com).] |
| L25 | Packing having the capacity to separate compounds with a molecular weight range from 100–5000 (as determined by polyethylene oxide), applied to neutral, anionic, and cationic water-soluble polymers. A polymethacrylate resin base, cross-linked with polyhydroxylated ether (surface contained some residual carboxyl functional groups) was found suitable. |
| L26 | Butyl silane chemically bonded to totally porous or superficially porous silica particles, 1.5–10 μm in diameter. |
| L27 | Porous silica particles, 30 to 50 μm in diameter. |
| L28 | A multifunctional support, which consists of a high purity, 100 Å, spherical silica substrate that has been bonded with anionic exchanger, amine functionality in addition to a conventional reversed phase C8 functionality. |
| L29 | Gamma alumina, reverse-phase, low carbon percentage by weight, alumina-based polybutadiene spherical particles, 5 μm in diameter with a pore volume of 80 Å. |
| L30 | Ethyl silane chemically bonded to totally porous silica particles, 3 to 10 μm in diameter. |
| L31 | A hydroxide-selective, strong anion-exchange resin-quaternary amine bonded on latex particles attached to a core of 8.5-μm macroporous particles having a pore size of 2000 Å and consisting of ethylvinylbenzene cross-linked with 55% divinylbenzene. |
| L32 | A chiral ligand-exchange packing–l-proline copper complex covalently bonded to irregularly shaped silica particles, 5 to 10 μm in diameter. |
| L33 | Packing having the capacity to separate dextrans by molecular size over a range of 4,000 to 500,000 Da. It is spherical, silica-based, and processed to provide pH stability. [Note—Available as TSK-GEL G4000SWxl from Tosoh Bioscience (www.tosohbioscience.com).] |
| L34 | Strong cation-exchange resin consisting of sulfonated cross-linked styrene–divinylbenzene copolymer in the lead form, 7 to 9 μm in diameter. |
| L35 | A zirconium-stabilized spherical silica packing with a hydrophilic (diol-type) molecular monolayer bonded phase having a pore size of 150 Å. |
| L36 | A 3,5-dinitrobenzoyl derivative of l-phenylglycine covalently bonded to 5-μm aminopropyl silica. |
| L37 | Packing having the capacity to separate proteins by molecular size over a range of 2,000 to 40,000 Da. It is a polymethacrylate gel. |
| L38 | A methacrylate-based size-exclusion packing for water-soluble samples. |
| L39 | A hydrophilic polyhydroxymethacrylate gel of totally porous spherical resin. |
| L40 | Cellulose tris-3,5-dimethylphenylcarbamate-coated, porous silica particles, 3–20 μm in diameter. |
| L41 | Immobilized α1-acid glycoprotein on spherical silica particles, 5 μm in diameter. |
| L42 | Octylsilane and octadecylsilane groups chemically bonded to porous silica particles, 5 μm in diameter. |
| L43 | Pentafluorophenyl groups chemically bonded to porous or superficially porous silica particles by a propyl spacer, 1.5–10 μm in diameter. |
| L44 | A multifunctional support, which consists of a high purity, 60 Å, spherical silica substrate that has been bonded with a cationic exchanger, sulfonic acid functionality in addition to a conventional reversed phase C8 functionality. |
| L45 | Beta cyclodextrin, R,S-hydroxypropyl ether derivative, bonded to porous silica particles, 3–10 μm in diameter. |
| L46 | Polystyrene/divinylbenzene substrate agglomerated with quaternary amine functionalized latex beads, about 9 to 11 μm in diameter. |
| L47 | High-capacity anion-exchange microporous substrate, fully functionalized with trimethlyamine groups, 8 μm in diameter. [Note—Available as CarboPac MA1 and distributed by Dionex Corp. (www.dionex.com).] |
| L48 | Sulfonated, cross-linked polystyrene with an outer layer of submicron, porous, anion-exchange microbeads, 5 to 15 μm in diameter. |
| L49 | A reversed-phase packing made by coating a thin layer of polybutadiene onto spherical porous zirconia particles, 3 to 10 μm in diameter. [Note—Available as Zirchrom PBD from www.zirchrom.com.] |
| L50 | Multifunction resin with reversed-phase retention and strong anion-exchange functionalities. The resin consists of ethylvinylbenzene, 55% cross-linked with divinylbenzene copolymer, 3 to 15 μm in diameter, and a surface area not less than 350 m2 per g. Substrate is coated with quaternary ammonium functionalized latex particles consisting of styrene cross-linked with divinylbenzene. [Note—Available as OmniPac PAX- 500 and distributed by Dionex Corp. (www.dionex.com).] |
| L51 | Amylose tris-3,5-dimethylphenylcarbamate-coated, porous, spherical, silica particles, 3–10 μm in diameter. [Note—Available as Chiralpak AD from Chiral Technologies, Inc. (www.chiraltech.com).] |
| L52 | A strong cation-exchange resin made of porous silica with sulfopropyl or sulfoethyl groups, 1–10 μm in diameter. |
| L53 | Weak cation-exchange resin consisting of ethylvinylbenzene, 55% cross-linked with divinylbenzene copolymer, 3 to 15 μm diameter. Substrate is surface grafted with carboxylic acid and/or phosphoric acid functionalized monomers. Capacity not less than 500 μEq/column. [Note— Available as IonPac CS14 distributed by Dionex Corp. (www.dionex.com).] |
| L54 | A size exclusion medium made of covalent bonding of dextran to highly cross-linked porous agarose beads, 5–15 μm in diameter. [Note—Available as Superdex Peptide HR 10/30 from www.gelifesciences.com.] |
| L55 | A strong cation-exchange resin made of porous silica coated with polybutadiene–maleic acid copolymer, about 5 μm in diameter. [Note— Available as IC-Pak C M/D from Waters Corp. (www.waters.com).] |
| L56 | Propyl silane chemically bonded to totally or superficially porous silica particles, 3–10 μm in diameter. [Note—Available as Zorbax SB-C3 from Agilent Technologies (www.agilent.com/chem).] |
| L57 | A chiral-recognition protein, ovomucoid, chemically bonded to silica particles, about 5 μm in diameter, with a pore size of 120 Å. [Note— Available as Ultron ES-OVM from Agilent Technologies (www.agilent.com/chem).] |
| L58 | Strong cation-exchange resin consisting of sulfonated cross-linked styrene-divinylbenzene copolymer in the sodium form, about 6 to 30 μm in diameter. [Note—Available as Aminex HPX-87N from Bio-Rad Laboratories, (2000/01 catalog, #125-0143) www.bio-rad.com.] |
| L59 | Packing for the size-exclusion separation of proteins (separation by molecular weight) over the range of 5 to 7000 kDa. The packing is a spherical 1.5- to 10-μm silica or hybrid packing with a hydrophilic coating. |
| L60 | Spherical, porous or superficially porous silica particles, 10 μm or less in diameter, the surface of which has been covalently modified with alkyl amide groups and endcapped. |
| L61 | A hydroxide selective strong anion-exchange resin consisting of a highly cross-linked core of 13-μm microporous particles having a pore size less than 10 Å units and consisting of ethylvinylbenzene cross-linked with 55% divinylbenzene with a latex coating composed of 85-nm diameter microbeads bonded with alkanol quaternary ammonium ions (6%). [Note—Available as Ion Pac AS-11 and AG-11 from Dionex (www.dionex.com).] |
| L62 | C30 silane bonded phase on a fully porous spherical silica or on superficially porous particles,1.5 –15 μm in diameter. |
| L63 | Glycopeptide teicoplanin linked through multiple covalent bonds to a 100-Å units spherical silica. [Note—Available as Astec Chirobiotic T from Supelco (www.sigmaaldrich.com).] |
| L64 | Strongly basic anion-exchange resin consisting of 8% cross-linked styrene-divinylbenzene copolymer with a quaternary ammonium group in the chloride form, 45 to 180 μm in diameter. [Note—A suitable grade is available as AG 1-X8 resin chloride form from www.discover.bio-rad.com.] |
| L65 | Strongly acidic cation-exchange resin consisting of 2% sulfonated cross-linked styrene-divinylbenzene copolymer with a sulfonic acid group in the hydrogen form, 45–250 μm in diameter. [Note—A suitable grade is available as AG 50W-X2 resin hydrogen form from www.bio-rad.com.] |
| L66 | A crown ether coated on a 5-μm particle size silica gel substrate. The active site is (S)-18-crown-6-ether. [Note—Available as Crownpak CR(+) from www.chiraltech.com.] |
| L67 | Porous vinyl alcohol copolymer with a C18 alkyl group attached to the hydroxyl group of the polymer, 2 to 10 μm in diameter. [Note—Available as apHera C18 from Supelco (www.sigmaaldrich.com).] |
| L68 | Spherical, porous silica, 10 μm or less in diameter, the surface of which has been covalently modified with alkyl amide groups and not endcapped. [Note—Available as SUPELCOSIL SUPLEX pKb-100 from Supelco (www.sigmaaldrich.com).] |
| L69 | Ethylvinylbenzene/divinylbenzene substrate agglomerated with quaternary amine functionalized 130-nm latex beads, about 6.5 μm in diameter. [Note—Available as CarboPac PA20 from www.dionex.com.] |
| L70 | Cellulose tris(phenyl carbamate) coated on 5-μm silica. [Note—Available as Chiralcel OC-H from www.chiraltech.com.] |
| L71 | No definition in USP 2025 |
| L72 | (S)-phenylglycine and 3,5-dinitroanaline urea linkage covalently bonded to silica. [Note—Available as Sumichiral OA-3300, distributed by www.phenomenex.com.] |
| L73 | No definition in USP 2025 |
| L74 | A strong anion-exchange resin consisting of a highly cross-linked core of 7- μm macroporous particles having a 100-Å average pore size and consisting of ethylvinylbenzene cross-linked with 55% divinylbenzene and an anion-exchange layer grafted to the surface, which is functionalized with alkyl quaternary ammonium ions. [Note—Available as IonPac AS14A from Dionex (www.dionex.com).] |
| L75 | A chiral-recognition protein, bovine serum albumine (BSA), chemically bonded to silica particles, about 7 μm in diameter, with a pore size of 300 Å. |
| L76 | Silica-based, weak cation-exchange material, 5 μm in diameter. Substrate is surface polymerized polybutadiene–maleic acid to provide carboxylic acid functionalities. Capacity not less than 29 μEq/column. [Note—Available as Metrosep C4-250 from Metrohm (www.metrohm.com).] |
| L77 | Weak cation-exchange resin consisting of ethylvinylbenzene, 55% cross-linked with divinylbenzene copolymer, 6- to 9-μm diameter. Substrate is surface grafted with carboxylic acid functionalized groups. Capacity is not less than 500 μEq/column (4 mm × 25 cm). |
| L78 | A silane ligand that consists of both reversed-phase (an alkyl chain longer than C8) and anion-exchange (primary, secondary, or tertiary amino groups) functional groups chemically bonded to porous or nonporous silica or ceramic microparticles, 1.0–50 μm in diameter, or a monolithic rod. [Note—Available as Acclaim Mixed-Mode WAX-1 from Thermo Fisher (www.thermofisher.com).] |
| L79 | A chiral-recognition protein, human serum albumin (HSA), chemically bonded to silica particles, about 5 μm in diameter. |
| L80 | Cellulose tris(4-methylbenzoate)-coated, porous, spherical, silica particles, 5–20 μm in diameter. |
| L81 | A hydroxide-selective, strong anion-exchange resin consisting of a highly cross-linked core of 9-μm porous particles having a pore size of 2000 Å and consisting of ethylvinylbenzene cross-linked with 55% divinylbenzene with a latex coating composed of 70-nm diameter microbeads (6% cross-linked) bonded with alkanol quaternary ammonium ions. [Note—A suitable column is Dionex IonPac AS11-HC available from www.thermofisher.com.] |
| L82 | Polyamine chemically bonded to cross-linked polyvinyl alcohol polymer, 5 μm in diameter. [Note—Available as Asahipak NH2P-50 from www.shodex.com.] |
| L83 | A hydroxide-selective, strong anion-exchange resin-quaternary amine bonded on latex particles attached to a core of 10.5-μm microporous particles of 10-Å pore size, and consisting of ethylvinylbenzene cross-linked with 55% divinylbenzene. |
| L84 | Weak cation-exchange resin consisting of ethyvinylbenzene, 55% cross-linked with divinylbenzene copolymer, 5 μm in diameter. Substrate is surface grafted with carboxylic acid functionalized groups. Capacity NLT 8400 μEq/column (5-mm × 25-cm). |
| L85 | A silane ligand that consists of both reversed-phase (an alkyl chain longer than C8) and weak cation-exchange (carboxyl groups) functional groups chemically bonded to porous or nonporous particles, 1.0–50 μm in diameter. |
| L86 | Fused core particles with a highly polar ligand possessing five hydroxyl groups tethered to the silica gel outer layer, 1.5–5 μm in diameter. |
| L87 | Dodecyl silane chemically bonded to porous or superficially porous silica particles, 1.5–10 μm in diameter. |
| L88 | Glycopeptide vancomycin linked through multiple covalent bonds to 100 Å spherical silica. |
| L89 | Packing having the capacity to separate compounds with a molecular range from 100 to 3000 (as determined by polyethylene oxide), applied to neutral and anionic water-soluble polymers. A polymethacrylate resin base, cross-linked with polyhydroxylated ether (surface contains some residual cationic functional groups). |
| L90 | Amylose tris-[(S)-α-methylbenzyl]carbamate coated on porous, spherical silica particles, 3–10 μm in diameter. |
| L91 | Strong anion-exchange resin consisting of monodisperse polystyrene/divinylbenzene beads coupled with quartenary amine. Bead size is 3– 10 μm. |
| L92 | A strong anion-exchange resin consisting of highly cross-linked 5- to 9-μm macroporous particles having a 100-Å average pore size and consisting of ethylvinylbenzene cross-linked with 55% divinylbenzene and an anion-exchange layer grafted to the surface, which is functionalized with alkanol quarternary ammonium ions. |
| L93 | Cellulose tris(3,5-dimethylphenylcarbamate) reversed-phase chiral stationary-phase coated on 3- or 5-μm silica gel particles. |
| L94 | A strong anion-exchange resin consisting of highly cross-linked 15-μm microporous particles functionalized with very low cross-linked latex (0.5%) to provide alkanol quartenary ammonium ion exchange sites. |
| L95 | A highly polar alkyl ligand comprising five hydroxyl groups that are chemically bonded to totally porous or superficially porous silica or a monolithic silica rod. |
| L96 | Alkyl chain, reversed-phase bonded totally or superficially to porous silica designed to retain hydrophilic and other polar compounds when using highly aqueous mobile phase, including 100% aqueous, 1.5–10 μm in diameter. |
| L97 | Weak cation-exchange resin consisting of a highly cross-linked core of 5.5-μm porous particles having a pore size of 2000 Å units and consisting of ethylvinylbenzene cross-linked with 55% divinylbenzene. Substrate is surface grafted with carboxylic acid functionalized groups. Capacity NLT 2400 μEq/column (4-mm × 25-cm). |
| L98 | Weak cation-exchange resin consisting of a highly cross-linked core of 8.0-μm microporous particles having an average pore size of 10 Å units and consisting of ethylvinylbenzene cross-linked with 55% divinylbenzene. Substrate is surface grafted with carboxylic acid functionalized groups. Capacity of NLT 46 μEq/column (4-mm × 5-cm). |
| L99 | Amylose tris-(3,5-dimethylphenylcarbamate), immobilized on porous, spherical, silica particles, 3–5 μm in diameter. |
| L100 | A 55% crosslinked, microporous, hydrophobic resin core (9-μm microporous particles having a pore size of 10 Å) that consists of a bilayer of anion and cation exchange latex. The first layer is fully sulfonated latex (140 nm) and the second layer is fully aminated latex (76 nm). |
| L101 | Cholesteryl groups chemically bonded to porous or nonporous silica or ceramic microparticles, 1.5–10 μm in diameter, or a monolithic rod. |
| L102 | 1-(3,5-Dinitrobenzamido)-1,2,3,4-tetrahydrophenanthrene covalently bonded to porous spherical silica particles, 5–10 μm in diameter. |
| L103 | A hydroxide-selective, strong anion-exchange resin consisting of a highly cross-linked core of 7.5-μm porous particles having a pore size of 2000 Å units and consisting of ethylvinylbenzene cross-linked with 55% divinylbenzene electrostatically bonded with hyperbranched alkanol quaternary ammonium ions. |
| L104 | Triazol groups chemically bonded to porous silica particles, 1.5–10 μm in diameter. |
| L105 | A strong anion-exchange resin consisting of highly cross-linked 9-μm supermacroporous (2000 Å) particles functionalized with very low cross-linked latex (0.2%) to provide alkyl quarternary ammonium ion sites. |
| L106 | Weak cation-exchange resin consisting of ethylvinylbenzene, 55% cross-linked with divinylbenzene copolymer, 5–8 μm diameter, macroporous particles having an average pore size of 100 Å units. Substrate is surface grafted with carboxylic acid and phosphonic acid functional groups. Capacity NLT 2800 μEq/column (4-mm × 25-cm). |
| L107 | No definition in USP 2025 |
| L108 | No definition in USP 2025 |
| L109 | Spherical particles of porous graphitic carbon, 1.5–30 μm in diameter. |
| L110 | A strong anion-exchange resin consisting of highly cross-linked 13-μm (less than 10 Å) particles coated with very low cross-linked latex (0.5%) to provide alkanol quaternary ammonium ion exchange sites. |
| L111 | No definition in USP 2025 |
| L112 | A hydroxide-selective, strong anion-exchange resin consisting of a highly cross-linked core of 8.5-μm porous particles having a pore size of 2000 Å units and consisting of ethylvinylbenzene cross-linked with 55% divinylbenzene with a latex coating composed of 65-nm diameter microbeads (5% crosslinked) bonded with alkanol quaternary ammonium ions. |
| L113 | A hydroxide-selective, strong anion-exchange resin consisting of a highly cross-linked core of 7.5-μm porous particles having a pore size of 2000 Å units and consisting of ethylvinylbenzene cross-linked with 55% divinylbenzene with a latex coating composed of 65-nm diameter microbeads (8% crosslinked) bonded with alkanol quaternary ammonium ions. |
| L114 | Sulfobetaine graft-polymerized to totally or superficially porous silica, 1.5–10 μm in diameter, or a monolithic rod. Packing having densely bonded zwitterionic groups with 1:1 charge balance. |
| L115 | No definition in USP 2025 |
| L116 | No definition in USP 2025 |
| L117 | No definition in USP 2025 |
| L118 | Aqueous polymerized C18 groups on silica particles, 1.2–5 μm in diameter. |
| L119 | Cellulose tris(3,5-dichlorophenylcarbamate), immobilized on porous, spherical silica particles, 3–5 μm in diameter. |
| L120 | A hydroxide-selective, strong anion-exchange resin consisting of a highly cross-linked core of 13-μm microporous particles having a pore size of <10 Angstrom units and consisting of ethylvinylbenzene cross-linked with 55% divinylbenzene with a latex coating composed of 65-nm diameter microbeads (8% cross-linked) with alkanol quaternary ammonium ions. Capacity NLT 10 μEq/column (4 mm × 5 cm). |
| L121 | A hydroxide-selective, strong anion-exchange resin consisting of a highly cross-linked core of 11-μm porous particles having a pore size of less than 10 Å units and consisting of ethylvinylbenzene cross-linked with 55% divinylbenzene electrostatically bonded with hyperbranched alkanol quaternary ammonium ions. |
| L122 | Sulfobetaine graft-polymerized to totally or superficially porous hydrophilic polymer particles, 1.0–10 μm in diameter, or a monolithic rod. Packing having densely bonded zwitterionic groups with 1:1 charge balance. |
| L123 | Cellulose tris(3-chloro-4-methylphenylcarbamate) coated porous silica particles, 3–20 μm in diameter. |
| L124 | Strong cation-exchange resin consisting of sulfonated cross-linked styrene–divinylbenzene in the silver form, average 25 μm in diameter. |
| L125 | Polyvinyl alcohol polymer gel weak cation-exchange packing material, 3–7 μm porous particles. The surface is polymerized with polybutadiene–maleic acid to provide carboxylic acid functionalities. The capacity is NLT 1 mEq/column. |
| L126 | Amylose tris (3-chlorophenylcarbamate), immobilized on porous, spherical, silica particles, 1–20 μm in diameter. |
| L127 | A crown ether chemically bonded to a 5-μm particle size silica gel substrate. The active site is (S)- pseudo-18-crown-6-ether. |
| L128 | Porous particles of polystyrene divinyl benzene with linear molecular weight operating range from 200–2,000,000 g/mol (polystyrene equivalent), 5 μm in diameter. |
| L129 | A hydroxide-selective, sodium and potassium complexing resin consisting of a cryptand molecule bonded to 5-μm macroporous particles with an average pore size of 100 Å and consisting of ethylvinylbenzene cross-linked with 55% divinylbenzene. |
| L130 | Cellulose tris(3,5-dimethylphenylcarbamate) coated on 10-μm silica gel particles. |
| L131 | Amylose tris-(3,5-dichlorophenylcarbamate), immobilized on porous, spherical, silica particles, 3–20 μm in diameter |
USP packing codes (L series) × brands available Source: the official code definitions in USP–NF 2025, 131 entries in total (the G and S series are for GC and have been excluded). Products cover all of the finished-column brands Microwants supplies — HPLCONE, COSMOSIL and ChiralOne in-house, and Fortis, Shodex, Shinwa and L-column as primary distributor. HPLCONE and COSMOSIL entries carry real model and part numbers (COSMOSIL shown as the representative 4.6 × 250 mm part number); distributed brands are given as series plus model, quoted on enquiry. At present 103 available entries, 20 with no current equivalent (short chains C1–C6/C12/C30, alumina, graphitic carbon, mixed mode and others) and 8 with no USP definition. Use the brand selector and L-number box below to filter.
| Code | USP definition | Products available (by brand) |
|---|
About this data:Eight codes in the L series (L71, L73, L107, L108, L111, L115, L116, L117) have no packing definition in USP 2025 and are marked accordingly. Phase coverage for distributed brands follows the manufacturers' product lines (Fortis Evosphere/SpeedCore, Shodex SUGAR/SEC/IC/HILIC, Shinwa ULTRON ES/VX/PS·STR, L-column ODS/C8/Phenyl); specific models and part numbers are subject to formal quotation. HPLCONE and COSMOSIL part numbers are taken from our own product database.