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Compound: Dextromethorphan
Separation of NyQuil Active Ingredients on Primesep C |
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Application Notes: Primesep C separates the active ingredients in the over-the-counter cold medicine, NyQuil. Succinate and bromate co-elute early, but acetaminophen, pseudoephedrine, doxylamine, and dextromethorphan are baseline resolved. A combination of cation exchange, complex formation, and hydrophobic interactions separate this mixture with a mobile phase of water, acetonitrile (MeCN, ACN) and triethylamine (TEA) phosphate with UV detection at 205 nm. Application Analytes: Application Detection: |
Separation and Retention of Dextromethorphan Bromide in Mixed-Mode HPLC: Buffer Concentration Effect |
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HPLC Separation of NyQuil Active |
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HPLC Separation of Drugs |
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Comparison of the Separation of Polar Drugs on Obelisc R and Zorbax SB-AQ |
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Separation of Drugs in Mixed-Mode HPLC (I) |
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Separation of Drugs in Mixed-Mode HPLC (II) |
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Application Notes: Acetaminophen, chlorpheniramine and dextromethorphan are common drugs which are used together to reduce symptoms of cold and flu. Components of Coricidin formulation are separated on Obelisc R column with ELSD-LC/MS-UV compatible method. All peaks are well separated and retained. Application Analytes: Application Detection: |
HPLC Separation of Drugs in Tylenol Cold and Cough Remedies |
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Application Notes: Components of Tylenol Cold and Cough Remedy are separated on Obelisc R mixed-mode column. Method can be used to determine compounds in various cough and cold compositions. Neutral (acetaminophen), basic (chlorpheniramine, dextromethorphan and pseudoephedrine) and acidic (maleic acid/Maleate) components are analyzed with perfect peak shape and retention control. Method can be used in production, QC/QA and biological studies for quantitation of various components in pharmaceutical formulations (Advil, Tylenol, Dimetapp, Robitussin, NyQuil, etc) Application Analytes: Application Detection: |
HPLC Separation of Drugs in Advil Allergy and Sinus |
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Application Notes: Ibuprofen is in a group of drugs called non-steroidal anti-inflammatory drugs (NSAIDs). Ibuprofen works by reducing hormones that cause inflammation and pain in the body. Pseudoephedrine is a decongestant that shrinks blood vessels in the nasal passages. Dilated blood vessels can cause nasal congestion (stuffy nose). The combination of chlorpheniramine, ibuprofen, and pseudoephedrine is used to treat sneezing, itching, watery eyes, runny nose, stuffy nose, sinus congestion, cough, and pain or fever caused by the common cold or flu in common over-the-counter medication (Advil, NyQuil, Tylenol, etc.) Active ingredients of Advil Allergy and Sinus composition are separated by combination of reverse phase, cation-exchange and anion exchange mechanisms. Obelisc R mixed-mode column is used to separate pseudoephedrine (polar basic compound), chlorpheniramine (hydrophobic basic compound), ibuprofen (hydrophobic acidic compound) and maleic acid (counter-ion, hydrophilic acid compound). Method can be used for QC in production, impurity profiling and research and development. All compounds are well separated with high efficiency and good peak shape. Method uses ammonium formate buffer but other buffers can be used as well (ammonium acetate, sodium and ammonium phosphate) with corresponding detection technique - ELSD, LC/MS, and UV. Chlorpheniramine is an antihistamine that reduces the natural chemical histamine in the body. Histamine can produce symptoms of sneezing, itching, watery eyes, and runny nose. Application Analytes: Application Detection: |
HPLC Analysis of Drugs in Saliva |
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HPLC Analysis of Basic Drugs and Acidic Counter-Ions by Mixed-Mode Chromatography |
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Application Notes: Majority of the drugs in pharmaceutical industries are administered in a salt form. The presence of two counter-ions very often requires two methods. The nature of these counterparts in drugs can be: inorganic cation and organic acid, inorganic anion and organic base, and organic cation and organic anion. Based on the property of molecules the stoichiometry can be different also. 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 reversed-phase mechanism, and counter-ion are retained by reversed-phase and anion-exchange mechanism. Some polar counter-ions are retained only by anion-exchange mechanism. Retention time and selectivity of HPLC separation of drugs and counter-ions can be achieved by changing amount of acetonitrile and amount of ions in the mobile phase. Detection technique depends on the properties of counter-ions. In case of low or no UV activity, ELSD can be employed if counter-ion forms non-volatile salt wit mobile phase additive (ammonium formate). This HPLC method can be used for simultaneous quantitation of other basic drugs and counter-ions. Presence of two mechanisms of retention allows to control retention times of drug and counter-ion independently, and even change order of elution when necessary. Application Analytes:
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Copyright © SIELC Technologies. 2002-2010
Copyright © SIELC Technologies. 2002-2010