CAS Number 58-08-2
Molecular Formula C8H10N4O2
Molecular Weight 194.195 g/mol
LogP -0.0700
  • Caffeine
  • 1,3,7-Trimethyl-3,7-dihydro-1H-purine-2,6-dione
  • 1H-Purine-2,6-dione, 3,7-dihydro-1,3,7-trimethyl-
  • 58-08-2
  • 1H-Purine-2,6-dione, 3,7-dihydro-1,3,7-trimethyl-
  • 5-26-13-00558
  • 1,3,7-Trimethylxanthine
  • 3,7-Dihydro-1,3,7-trimethyl-1H-purine-2,6-dione
  • 7-Methyltheophylline
  • Alert-Pep
  • cafeina
  • Cafeine
  • Caffedrine
  • Caffein
  • Caffeine Methyltheophylline
  • Cafipel
  • Coffein
  • DHCplus
  • Durvitan
  • Guaranine
  • Hycomine
  • Koffein
  • Mateina
  • Methyltheobromine
  • NSC 5036
  • Phensal
  • Refresh'n
  • Shape Plus
  • Stay Alert
  • Synalgos
  • Tri-Aqua
  • UN 1544
  • Wigraine
  • Anhydrous caffeine
  • BRN 0017705
  • Cafamil
  • Cafecon
  • Caffeine, synthetic
  • Caffine
  • Coffeine
  • Coffeinum
  • Dexitac
  • EINECS 200-362-1
  • Eldiatric C
  • FEMA No. 2224
  • NCI-C02733
  • Nix Nap
  • Organex
  • Quick-Pep
  • Theobromine, 1-methyl-
  • Theophylline, 7-methyl
  • Vivarin
  • Xanthine, 1,3,7-trimethyl
  • Caffeina
  • UNII-3G6A5W338E
  • 1,3,7-Trimethyl-3,7-dihydro-1H-purine-2,6-dione
  • 1,3,7-trimethyl-2,3,6,7-tetrahydro-1H-purine-2,6-dione
  • 1,3,7-trimethylpurine-2,6-dione
  • 1,3,7-trimethylpurine-2,6-quinone
  • 1-Methyl-Theobromine
  • 1-methyltheobromine
  • 3,7-Dihydro-1,3,7-trimethyl-1H-purin-2,6-dion
  • 7-Methyl Theophylline
  • Anhydrous caffeine (JP15)
  • Lanorinal
  • Methyltheobromide
  • Methylxanthine theophylline
  • Monohydrate Caffeine
  • Propoxyphene
  • Thein
  • anhydrous caffeine
  • teina
  • theine
  • 95789-13-2
  • 71701-02-5


Control of Cation Exchange Properties by pH of Primesep C Column

Primesep C demonstrates the control of ion-exchange properties of Primesep columns. The peak order of caffeine and benzylamine in a mixture of caffeine, benzylamine, and phenol reverses when the mobile phase modifier is changed from ammonium acetate to trifluoroacetic acid. Control of the separation is possible even with mass spec (LC/MS) compatible mobile phases of water, acetonitrile (MeCN, ACN) and ammonium acetate or trifluoroacetic acid (TFA).

Application Analytes:


HPLC Separation of Coffee

The amount of caffeine in regular and decaffeinated coffee can be determined using a Primesep SB column. The HPLC method combines reversed-phase and polar interactions to elute caffeine without interference from the coffee complex mixture. This method can be made even more robust by incorporating a diverter valve and a guard column to prevent late eluting components from sticking to the Primesep SB column. The sample is injected onto the guard column and after a defined time point, the eluent flow is reversed to elute the caffeine peak onto the analytical column without the late eluters that can shorten column life. The HPLC separation uses a mobile phase of water, methanol (MeOH) and phosphoric acid (H3PO4) and UV detection at 270 nm.

Application Analytes:

Decaffeinated Coffee
Regular Coffee

HPLC Analysis of Active Drug in a Formulation

HPLC method for separation of active ingredients of drug/supplemental composition was developed on an Obelisc R trimodal HPLC column. Compounds are retained by combination of reversed-phase, cation-exchange and anion-exchange mechanisms. Compounds are well separated, and method can be used for quantitation of pyridoxine, ascorbic acid, niacinamide, pantothenic acid, caffeine and riboflavin in a mixture or as separate compounds in various complex mixtures. Various detection techniques can be applied for quantitation (ELSD, UV, LC/MS, Corona). This HPLC method can be adopted as general approach for analysis of active drug components in various formulations.

Application Analytes:

Ascorbic Acid
Pantothenic Acid
Riboflavin (Vitamin B2)

HPLC Separation of Caffeine and Phenylephrine

Caffeine and phenylephrine are some of the components of various pain killer/fever reducers/cough compositions. In this application, both of these compounds are separated on Primesep 100 and Primesep 200 columns. Caffeine is retained by reversed-phase mechanisms and phenylephrine is retained by combination of reversed-phase and cation-exchange mechanisms. Retention time for caffeine is controlled by the amount of acetonitrile, while retention time of phenylephrine is controlled by amount of the acetonitrile, buffer concentration and buffer pH. The method can be used for analysis of components of pain, cough and cold medication in pharmaceutical production. Method is robust and reproducible and provides good retention and peak shape. Compounds are monitored by UV, ELSD, CAD or LC/MS. Analysis of active components on biofluids (urine, plasma, blood, etc) is possible with additional sample preparation (protein precipitation, SPE, etc.)

Application Analytes:


HPLC Separation of Components of Excedrin

Excedrin is over-the-counter pain reliever containing acetaminophen, caffeine and aspirin as active ingredients of this drug composition. Acetaminophen (paracetamol) is used as analgesic and pain reliever. It is a neutral compound with low hydrophobicity. Aspirin or acetylsalicylic acid is used as analgesic and anti-inflammatory component of many OTC compositions. It is weakly acidic and slightly hydrophobic compound. Caffeine is xanthine alkaloid which is psychoactive stimulant drug. All four compounds are separated on mixed-mode Primesep 100 HPLC column with acetonitrile/water/TFA mobile phase. In this HPLC application compounds are retained by reversed phase mechanism. This HPLC method is short and robust.

Application Analytes:

Acetylsalicylic Acid
Benzoic Acid

HPLC Separation of Caffeine, 3- Methylxanthine, 1- Methylxanthine, Xanthine
    Application Notes: Xanthines are polar neutral compounds which are hard to retain and separate by traditional reversed-phase chromatography. However a hydrogen bonding method makes separation possible due to an observable correlation between the number of hydrogens available for interaction and retention time. Molecules with no hydrogens available for interactions retain less, and compound with multiple hydrogen donors retain the most. Retention time can be controlled by changing ratio of ACN:MeOH. Other protic and aprotic solvents can be used to control retention time and selectivity of separation. Application Columns: SHARC 1, 3.2x100 mm, 5 um, 100A, To learn more about SHARC 1 columns click here. To order this column click here. To see more chromatographic separations check our web site. Application Compounds:  Caffeine, 3-methylxanthine, 1-methylxanthine, and xanthine

Application Analytes:


USP Methods for the Analysis of an Analgesic Mixture Using the Legacy L1 Column


Application Notes: Acetametaphin, aspirin, and caffeine tablets contain not less than 90 percent and not more than 110 percent of the labeled amounts if acetametaphin, asprin, and caffeine according the USP methods. USP HPLC method for separation of acetaminophen, aspirin and caffeine was developed on Legacy L1 column according to US Pharmacopeia methodology. L1 classification is assigned to reversed-phase HPLC column contains C18 ligands. Support for the material is a spherical silica gel with particles size 3-10 um and pore size of 100-120A. Resolution between critical pairs corresponds to rules and specifications of USP.

Application Columns: Legacy L1 C18 HPLC column

Application compounds: Acetaminophen, Aspirin, Caffeine, benzoic acid, and salicylic acid

Mobile phase: MeOH/H2O/AcOH 28/69/3

Detection technique: UV

Reference: USP30: NF35

Application Analytes:

Acetaminophen (Paracetamol)
Benzoic Acid

USP Methods for the Analysis of Caffeine using the Legacy L1 Column


Application Notes: Caffeine is the most common stimulant used. According to USP methods, caffeine should be anhydrous or contain no more than one molecule of water of hydration. Additionally, caffeine should not contain more than 101% and no less 98.5% caffeine calculate on a anhydrous basis. The USP HPLC method for the separation of caffeine was developed on Legacy L1 column according to the US Pharmacopeia methodology. L1 classification is assigned to reversed-phase HPLC column containing C18 ligand. Support for the material is spherical silica gel with particles size 3-10 um and pore size of 100-120A. Resolution between critical pairs corresponds to rules and specifications of UPS.  

Application Columns: Legacy L1 C18 HPLC column

Application compounds: Caffeine

Mobile phase: NaAc/H2O/MeCN/THF 1.64g/2L/50 ml/40 ml/ pH 4.5 with AcOH

Detection technique: UV

Reference: USP35: NF30

Application Analytes:


HPLC Separation of Caffeine, Benzoic acid and Acetaminophen


Column Legacy L1, 4.6x250 mm, 5 µm, 100A
Mobile Phase MeOH - 28%
Buffer Acetic Acid - 3%
Flow Rate 1.5 ml/min
Detection UV, 275 nm


Class of Compounds  Drug, Acid,  Hydrophilic, Hydrophobic, Ionizable
Analyzing Compounds Caffeine, Benzoic acid, Acetaminophen

Application Analytes:

Acetaminophen (Paracetamol)
Benzoic Acid

HPLC Separation of Acetaminophen, Caffeine and Pyrilamine maleate

Acetaminophen is a p-aminophenol derivative with analgesic and antipyretic activities. It has weak anti-inflammatory properties, may cause liver, blood cell, and kidney damage. It is a nonprescription medication for mild-to-moderate pain and fever. Caffeine is a Central Nervous System (CNS) stimulant. It is an unregulated and legal drug in most parts of the world. It can be found in the seeds and leaves in a number of plants native in Africa, East Asia and South America. Pyrilamine maleate is a histamine H1 antagonist with hypnotic properties. It has multiple uses such as an anesthetic and is used against allergies. Newcrom R1, a column that takes advantage of the newest technologies, does not contain embedded acidic nor basic ionizable groups and can retain Acetaminophen, Caffeine and Pyrilamine maleate. The method is UV compatible and can be used as a general approach for analyzing similar compounds.

Application Analytes:

Acetaminophen (Paracetamol)
Pyrilamine maleate