Determination of lipoic acid by flow-injection and high-performance liquid chromatography with chemiluminescence detection. 2012

E Wołyniec, and J Karpińska, and S Losiewska, and M Turkowicz, and J Klimczuk, and A Kojło
Institute of Chemistry, University of Białystok, Białystok, Poland. elaw@uwb.edu.pl

A new flow-injection (FI) and high performance liquid chromatography (HPLC) with chemiluminescence detection method has been proposed for the determination of α-lipoic acid (LA). The assay is based on the measurement of chemiluminescence (CL) produced during the reaction of α-lipoic acid with potassium permanganate in a sodium hexametaphosphate medium (pH 3). This reaction is accompanied by a weak CL, which is greatly increased in the presence of a formaldehyde solution. The proposed FI method allows the determination of LA over the range: 0.5-20μgmL(-1) with LOD 4×10(-3)μgmL(-1). An introduction of HPLC into the flow manifold improves selectivity of the method and allows the determination of LA in a complex sample. The chromatographic linear range is 2.5-30μgmL(-1) with LOD 1.774μgmL(-1). Chromatographic separation was achieved by isocratic elution (acetonitrile/potassium dihydrogen phosphate, pH 3, adjusted with phosphoric acid): 30/70 using a Cosmosil 5C(18)-MS-II (4.6mm×150mm I.D.) column at a flow rate of 1.0mLmin(-1). The presented methods were utilized to determine the α-lipoic acid content in "Alfa-lipoic acid" capsules and in food products.

UI MeSH Term Description Entries
D008063 Thioctic Acid An octanoic acid bridged with two sulfurs so that it is sometimes also called a pentanoic acid in some naming schemes. It is biosynthesized by cleavage of LINOLEIC ACID and is a coenzyme of oxoglutarate dehydrogenase (KETOGLUTARATE DEHYDROGENASE COMPLEX). It is used in DIETARY SUPPLEMENTS. Lipoic Acid,Alpha-Lipogamma,Alpha-Lipon Stada,Alpha-Liponsaure Sofotec,Alpha-Lippon AL,Alphaflam,Azulipont,Fenint,Juthiac,Liponsaure-ratiopharm,MTW-Alphaliponsaure,Neurium,Pleomix-Alpha,Pleomix-Alpha N,Thioctacid,Thioctacide T,Thiogamma Injekt,Thiogamma oral,Tromlipon,Verla-Lipon,alpha-Lipoic Acid,alpha-Liponaure Heumann,alpha-Liponsaure von ct,alpha-Vibolex,biomo-lipon,duralipon,espa-lipon,Acid, alpha-Lipoic,Alpha Lipogamma,Alpha Lipon Stada,Alpha Liponsaure Sofotec,Alpha Lippon AL,AlphaLipogamma,AlphaLipon Stada,AlphaLiponsaure Sofotec,AlphaLippon AL,Injekt, Thiogamma,Liponsaure ratiopharm,Liponsaureratiopharm,MTW Alphaliponsaure,MTWAlphaliponsaure,Pleomix Alpha,Pleomix Alpha N,PleomixAlpha,PleomixAlpha N,Verla Lipon,VerlaLipon,alpha Lipoic Acid,alpha Liponaure Heumann,alpha Liponsaure von ct,alpha Vibolex,alphaLiponaure Heumann,alphaLiponsaure von ct,alphaVibolex,biomo lipon,biomolipon,espa lipon,espalipon
D008163 Luminescent Measurements Techniques used for determining the values of photometric parameters of light resulting from LUMINESCENCE. Bioluminescence Measurements,Bioluminescent Assays,Bioluminescent Measurements,Chemiluminescence Measurements,Chemiluminescent Assays,Chemiluminescent Measurements,Chemoluminescence Measurements,Luminescence Measurements,Luminescent Assays,Luminescent Techniques,Phosphorescence Measurements,Phosphorescent Assays,Phosphorescent Measurements,Assay, Bioluminescent,Assay, Chemiluminescent,Assay, Luminescent,Assay, Phosphorescent,Assays, Bioluminescent,Assays, Chemiluminescent,Assays, Luminescent,Assays, Phosphorescent,Bioluminescence Measurement,Bioluminescent Assay,Bioluminescent Measurement,Chemiluminescence Measurement,Chemiluminescent Assay,Chemiluminescent Measurement,Chemoluminescence Measurement,Luminescence Measurement,Luminescent Assay,Luminescent Measurement,Luminescent Technique,Measurement, Bioluminescence,Measurement, Bioluminescent,Measurement, Chemiluminescence,Measurement, Chemiluminescent,Measurement, Chemoluminescence,Measurement, Luminescence,Measurement, Luminescent,Measurement, Phosphorescence,Measurement, Phosphorescent,Measurements, Bioluminescence,Measurements, Bioluminescent,Measurements, Chemiluminescence,Measurements, Chemiluminescent,Measurements, Chemoluminescence,Measurements, Luminescence,Measurements, Luminescent,Measurements, Phosphorescence,Measurements, Phosphorescent,Phosphorescence Measurement,Phosphorescent Assay,Phosphorescent Measurement,Technique, Luminescent,Techniques, Luminescent
D010084 Oxidation-Reduction A chemical reaction in which an electron is transferred from one molecule to another. The electron-donating molecule is the reducing agent or reductant; the electron-accepting molecule is the oxidizing agent or oxidant. Reducing and oxidizing agents function as conjugate reductant-oxidant pairs or redox pairs (Lehninger, Principles of Biochemistry, 1982, p471). Redox,Oxidation Reduction
D010710 Phosphates Inorganic salts of phosphoric acid. Inorganic Phosphate,Phosphates, Inorganic,Inorganic Phosphates,Orthophosphate,Phosphate,Phosphate, Inorganic
D011196 Potassium Permanganate Permanganic acid (HMnO4), potassium salt. A highly oxidative, water-soluble compound with purple crystals, and a sweet taste. (From McGraw-Hill Dictionary of Scientific and Technical Information, 4th ed) Permanganate, Potassium
D002851 Chromatography, High Pressure Liquid Liquid chromatographic techniques which feature high inlet pressures, high sensitivity, and high speed. Chromatography, High Performance Liquid,Chromatography, High Speed Liquid,Chromatography, Liquid, High Pressure,HPLC,High Performance Liquid Chromatography,High-Performance Liquid Chromatography,UPLC,Ultra Performance Liquid Chromatography,Chromatography, High-Performance Liquid,High-Performance Liquid Chromatographies,Liquid Chromatography, High-Performance
D005504 Food Analysis Measurement and evaluation of the components of substances to be taken as FOOD. Analysis, Food,Analyses, Food,Food Analyses
D005557 Formaldehyde A highly reactive aldehyde gas formed by oxidation or incomplete combustion of hydrocarbons. In solution, it has a wide range of uses: in the manufacture of resins and textiles, as a disinfectant, and as a laboratory fixative or preservative. Formaldehyde solution (formalin) is considered a hazardous compound, and its vapor toxic. (From Reynolds, Martindale The Extra Pharmacopoeia, 30th ed, p717) Formalin,Formol,Methanal,Oxomethane
D016877 Oxidants Electron-accepting molecules in chemical reactions in which electrons are transferred from one molecule to another (OXIDATION-REDUCTION). Oxidant,Oxidizing Agent,Oxidizing Agents,Agent, Oxidizing,Agents, Oxidizing
D017022 Flow Injection Analysis The analysis of a chemical substance by inserting a sample into a carrier stream of reagent using a sample injection valve that propels the sample downstream where mixing occurs in a coiled tube, then passes into a flow-through detector and a recorder or other data handling device. Analysis, Flow Injection,Analyses, Flow Injection,Flow Injection Analyses,Injection Analyses, Flow,Injection Analysis, Flow

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