| CAS Number | 303-38-8 |
|---|---|
| Molecular Formula | C7H6O4 |
| Molecular Weight | 154.121 g/mol |
| InChI Key | GLDQAMYCGOIJDV-UHFFFAOYSA-N |
| LogP | 1.20 |
| Synonyms |
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Applications:
Mixed-Mode Separation of Dihydroxybenzoic Acids
Primesep B offers better selectivity over traditional, reversed-phase C18 columns for separating regioisomers of aromatic dihydroxybenzoic acids (2,3-dihydroxybenzoic, 2,4-dihydroxybenzoic, 2,5-dihydroxybenzoic 3,4-dihydroxybenzoic, 3,5-dihydroxybenzoic acids) Primesep B combines reversed-phase and anion-exchange mechanism with a mass spec compatible mobile phase of water, acetonitrile (MeCN, ACN) and trifluoracetic acid (TFA).
| Column | Primesep B, 4.6x150 mm, 5 µm, 100A |
| Mobile Phase | MeCN |
| Buffer | TFA |
| Flow Rate | 1.0 ml/min |
| Detection | UV, 270 nm |
| Class of Compounds | Drug, Acid, Hydrophilic, Ionizable, Vitamin, Supplements |
| Analyzing Compounds | 3.4-dihydroxybenzoic acid, 3.5-dihydroxybenzoic acid,2,4-dihydroxybenzoic acid, 2,5-dihydroxybenzoic acid, 2,3-dihydroxybenzoic acid |
Application Analytes:
2,3-Dihydroxybenzoic Acid
2,4-Dihydroxybenzoic Acid
2,5-Dihydroxybenzoic Acid
3,4-Dihydroxybenzoic Acid
3,5-Dihydroxybenzoic Acid
Carboxylic Acids
HPLC Separation of Dihydroxybenzoic Acid
Separation of hydrophilic isomers is very difficult when only one mechanism of retention, like reversed-phase, is available. Isomers have very similar hydrophobic properties. In case of mixed-mode chromatography, small difference in hydrophobic and ionic properties allows to separate isomers. Isomers of dihydroxybenzoic acids are separated on a Primesep D column with good selectivity and peak shape. This method can be used for separation of other hydrophilic acidic compounds as well as hydrophobic basic compound.
| Column | Primesep D, 4.6x150 mm, 5 µm, 100A |
| Mobile Phase | MeCN |
| Buffer | TFA |
| Flow Rate | 1.0 ml/min |
| Detection | UV, 250 nm |
| Class of Compounds | Drug, Acid, Hydrophilic, Ionizable, Vitamin, Supplements |
| Analyzing Compounds | 3.4-dihydroxybenzoic acid, 3.5-dihydroxybenzoic acid,2,4-dihydroxybenzoic acid, 2,5-dihydroxybenzoic acid, 2,3-dihydroxybenzoic acid |
Application Analytes:
2,3-Dihydroxybenzoic Acid
2,4-Dihydroxybenzoic Acid
2,5-Dihydroxybenzoic Acid
3,4-Dihydroxybenzoic Acid
3,5-Dihydroxybenzoic Acid
Generic Screening Method for Complex Mixtures
| Column | Primesep 200, 4.6*150 mm 5 µm, 100A |
| Mobile Phase | MeCN/H2O |
| Buffer | H2SO4 |
| Flow Rate | 1.0 ml/min |
| Detection | UV, 215 nm |
| Class of Compounds | Drug, Acid, Hydrophilic, Ionizable, Hormone |
| Analyzing Compounds | Uracil, Epinephrine, DOPA, 2,6-Lutidine, Benzylamine, Hydroxytrypthophan, Homovanillic acid, Phenol, Tryptophan , 2,3-DHBA, Benzoic acid, Methylparaben, Ethylparaben, Toluene, Amitriptyline |
Application Analytes:
2,3-Dihydroxybenzoic Acid
2,6-Lutidine
Amitriptyline
Benzoic Acid
Benzylamine
DOPA (3,4-dihydroxy-L-phenylalanine)
Epinephrine
Ethylparaben
Homovanillic Acid
Hydroxytryptophan
Methylparaben
Phenol
Toluene
Tryptophan
Uracil
HPLC Separation of Dihydroxybenzoic Acids on Newcrom B Column
Dihydroxybenzoic acids are aromatic compounds consisting of a phenolic ring and a carboxylic acid. The six main compounds are structurally similar and are difficult to separate in reverse-phase HPLC. The can be separated by using a mixed-mode Newcrom B column with the mobile phase having either methanol (MeOH) or acetonitrile (ACN) as an organic modifier having different retention characteristics. Using the gradient of organic modifier, water and sulfuric acid (H2SO4) as buffer, dihydroxybenzoic acids can be separated and UV detected at 250nm.
| Column | Newcrom B, 4.6x150 mm, 5 µm, 100A |
| Mobile Phase | MeCN |
| Buffer | H2SO4 |
| Flow Rate | 1.0 ml/min |
| Detection | UV, 250 nm |
| Class of Compounds | Drug, Acid, Hydrophilic, Ionizable, Vitamin, Supplements |
| Analyzing Compounds | 3.4-dihydroxybenzoic acid, 3.5-dihydroxybenzoic acid,2,4-dihydroxybenzoic acid, 2,5-dihydroxybenzoic acid, 2,3-dihydroxybenzoic acid, 2,6-dihydroxybenzoic acid |
Application Analytes:
2,3-Dihydroxybenzoic Acid
2,4-Dihydroxybenzoic Acid
2,5-Dihydroxybenzoic Acid
2,6-Dihydroxybenzoic acid
3,4-Dihydroxybenzoic Acid
3,5-Dihydroxybenzoic Acid