CAS Number | 104-15-4 |
---|---|
Molecular Formula | C7H8O3S |
Molecular Weight | 172.200 |
InChI Key | JOXIMZWYDAKGHI-UHFFFAOYSA-N |
LogP | -0.0248 |
Synonyms |
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Organic acids were separated on a HILIC/cation-exchange column in HILIC/anion-exclusion mode. This column can be used for analysis of polar compounds in HILIC mode. If compounds are ionizable, additional mode of interaction can be added (cation-exchange or anion-exclusion).
Column | Primesep S2, 4.6×150 mm, 5 µm, 100A |
Mobile Phase | MeCN/H2O – 85/15% |
Buffer | AmAc pH 5.0 15 mM |
Flow Rate | 1.0 ml/min |
Detection | ELSD, 50C UV 250 nm |
Class of Compounds |
Nucleosides, Hydrophilic, Ionizable |
Analyzing Compounds | Toluenesulfonic acid, Naphthalenedisulfonic acid, 3.5 DHBA, Ascorbic acid, |
The Primesep family of mixed-mode columns offer a wide variety of stationary phases with an unprecedented selectivity in the separation of a broad array of chemical compounds and in multiple applications. Corresponding Primesep guard columns are available with all stationary phases and do not require holders. SIELC offers a method development service which is available for all customers. Ask about our special custom LC-phases tailored for specific separations.
Select optionsSeparation type: Liquid Chromatography Mixed-mode
Column | Newcrom BH, 3.2×50 mm, 3 µm, 100A |
Mobile Phase | MeCN/H2O – 40/60% |
Buffer | H3PO4 – 3% |
Flow Rate | 0.5 ml/min |
Detection | UV 275nm |
Class of Compounds | Acid |
Analyzing Compounds | Benzenesulfonic, p-Toluenesulfonic Acids |
The Newcrom columns are a family of reverse phase-based columns. Newcrom A, AH, B, and BH are all mixed-mode columns with either positive or negative ion-pairing groups attached to either short (25 Å) or long (100 Å) ligand chains. Newcrom R1 is a special reverse phase column with low silanol activity.
Select optionsThe majority of drugs in the pharmaceutical industry are administered in salt form. The presence of two counter-ions very often necessitates the use of two methods. The nature of these counterparts in drugs can be an inorganic cation and organic acid, inorganic anion and organic base, and organic cation and organic anion. Furthermore, the properties of the molecules will result in a differing stoichiometry. The task of simultaneous quantitation of counter-ions can be achieved by using mixed-mode columns. The general approach for analysis is based on properties of corresponding counter-ions. Hydrophobic basic drugs, like dextromethorphan, verapamil, trimipramine, and corresponding acidic counter-ions (chloride, chlorate, bromide, bromate, perchlorate, maleate, fumarate,tartrate, succinate, phosphate, citrate, benzosulfonate, toleuensulfonate) can be separated and quantitated in the same run on reversed-phase anion-exchange column. Basic hydrophobic drugs are retained by the reversed-phase mechanism, and counter-ions are retained by the reversed-phase and anion-exchange mechanism. Some polar counter-ions are retained only by the anion-exchange mechanism. Retention time and selectivity of HPLC separation of drugs and counter-ions can be achieved by changing the amount of acetonitrile and the amount of ions in the mobile phase. The detection technique depends on the properties of the counter-ions. In case of low or no UV activity, ELSD can be employed if the counter-ion forms a non-volatile salt with the mobile phase additive (ammonium formate). This HPLC method can be used for simultaneous quantitation of other basic drugs and counter-ions. The presence of two mechanisms of retention allows control over retention times of drug and counter-ion independently, and even allows a change of order of elution when necessary.
Column | Primesep D , 4.6×150 mm, 5 µm, 100A |
Mobile Phase | MeCN/H2O |
Buffer | AmFm pH 3.0 |
Flow Rate | 1.0 ml/min |
Detection | ELSD, UV 270 |
Class of Compounds | Ions, Hydrophilic, Hydrophobic, Base, Acids, Ionizable |
Analyzing Compounds | Sodium Chloride, Sodium chloride, Sodium Chlorate, Sodium bromide, Sodium bromate, Perchloric Acid, Maleic Acid, Fumaric Acid, Tartaric Acid, Succinic Acid, Phosphoric Acid, Citric acid, Benzosulfonic acid, Dextromethorphan, Verapamil, Trimipramine |
The Primesep family of mixed-mode columns offer a wide variety of stationary phases with an unprecedented selectivity in the separation of a broad array of chemical compounds and in multiple applications. Corresponding Primesep guard columns are available with all stationary phases and do not require holders. SIELC offers a method development service which is available for all customers. Ask about our special custom LC-phases tailored for specific separations.
Select optionsIonic liquid is an ionic compound which is liquid at room (or close to room) temperature. Most of the ionic liquids are in a dynamic equilibrium where at any time more than 99.99% of the liquid is made up of ionic, rather than molecular, species. Room-temperature ionic liquids consist of bulky cation (for example, substituted imidazolium) compounds. A wide range of anions is used as counter ions in ionic liquids: organic and inorganic anions such as chloride, iodide, tetrafluoroborate, hexafluorophosphate, bistriflimide, triflate, tosylate. Ionic liquids are widely used as solvents in organic reactions. When products are isolated from ionic liquids, they need to be analyzed for residual ionic liquid content.
Because both constituents of the ionic liquid are very different in terms of charge and hydrophobic properties, it is impossible to analyze entire ionic liquids by traditional chromatography. An effective and universal method for analysis of ionic liquids is developed on an Obelisc R HPLC column. Components on the ionic liquids are retained based on ionic and hydrophobic interactions. Obelisc R column has both positively and negatively charged ionic groups, making it possible to retain and separate cations and anions of ionic liquids on one column. Method can be used for quantitative of various ionic liquids containing organic and inorganic ions. Retention time of basic component can be effectively adjusted by pH, stronger anionic and hydrophobic counter-ions might require higher buffer concentration. Composition can be monitored by combination of UV and ELSD or by LC/MS.
Column | Obelisc R , 4.6×150 mm, 5 µm, 100A |
Mobile Phase | MeCN/H2O |
Buffer | AmAc |
Flow Rate | 1.0 ml/min |
Detection | ELSD |
Class of Compounds |
Acid |
Analyzing Compounds | 1-Methyl-3-propylimidazolium, Bromide Ion, Methylsulfonic Acid, Trifluoroacetic Acid, Perchloric Acid, p-Toluenesulfonic Acid |
SIELC has developed the mixed-mode Obelisc™ columns to be the first commercially available columns with Liquid Separation Cell technology (LiSC™). This cost effective duo can replace multiple HPLC columns such as reversed-phase (RP), AQ-type reversed-phase, polar-embedded group RP columns, normal-phase, cation-exchange, anion- exchange, ion-exclusion, and HILIC (Hydrophilic Interaction Liquid Chromatography) columns. By controlling just three orthogonal method parameters - Buffer concentration, Buffer pH, and Organic Modifier Concentration - users can adjust the column properties with pinpoint precision to separate complex mixtures.
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