Search Results - "Moldoveanu, Serban C."

Antioxidant Character and Levels of Polyphenols in Several Tea Samples by Moldoveanu, Serban C, Oden, Ross

“…The present study measured the antioxidant properties of 15 commercial tea samples as expressed by the oxygen radical absorbance capacity (ORAC) hydro, ORAC…”
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Evaluation of the phase ratio for three C18 high performance liquid chromatographic columns by Caiali, Edvin, David, Victor, Aboul-Enein, Hassan Y., Moldoveanu, Serban C.

“…•A simple calculation for column phase ratio is proposed.•Homologous series benzene to butylbenzene is used as probe compounds.•Phase ratio is shown to vary…”
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Sources of Nonlinear van’t Hoff Temperature Dependence in High-Performance Liquid Chromatography by Tanase, Maria, Soare, Andreia, David, Victor, Moldoveanu, Serban C

“…In HPLC, the nonlinear behavior of the retention factor k′ with temperature (dependence of ln k′ on 1/T) can be attributed to the multiple interactions of a…”
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Partial Vapor Pressures, Activity Coefficients, Henry Volatility, and Infinite Dilution Activity Coefficients of Nicotine from Binary Mixtures with Glycerol and with 1,2-Propanediol at 298.15 K by St Charles, F Kelley, Moldoveanu, Serban C

“…The equilibrium headspace concentration of nicotine in nitrogen gas was measured by gas chromatography for binary mixtures of nicotine with glycerol and with…”
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Comparison of several HPLC methods for the analysis of vitamin C by Moldoveanu, Serban C.

“…Ascorbic acid is a water‐soluble vitamin common in food and dietary supplements. A usual problem with ascorbic acid analysis is the lack of stability of its…”
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Interconversion of nicotine enantiomers during heating and implications for smoke from combustible cigarettes, heated tobacco products, and electronic cigarettes by Moldoveanu, Serban C.

“…Physiological properties of (R)‐nicotine have differences compared with (S)‐nicotine, and the subject of (S)‐ and (R)‐nicotine ratio in smoking or vaping…”
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Derivatization procedures and their analytical performances for HPLC determination in bioanalysis by David, Victor, Moldoveanu, Serban C., Galaon, Toma

“…Derivatization, or chemical structure modification, is often used in bioanalysis performed by liquid chromatography technique in order to enhance detectability…”
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Comparison of two methods for ginsenosides quantitation by Moldoveanu, Serban C., Gan, Huamin

“…The present study provides a comparison of two liquid chromatography–tandem mass spectrometry methods for ginsenosides analysis. The two methods have the same…”
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Gas chromatography/mass spectrometry versus liquid chromatography/fluorescence detection in the analysis of phenols in mainstream cigarette smoke by Moldoveanu, Serban C., Kiser, Melissa

“…A new gas chromatographic/mass spectrometric (GC/MS) technique for the analysis of hydroxybenzenes (phenols) in mainstream cigarette smoke has been developed…”
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Critical evaluation of several techniques for the analysis of phthalates and terephthalates: Application to liquids used in electronic cigarettes by Moldoveanu, Serban C., Yerabolu, Ravikiran

“…•Describes six original techniques for the analysis of eight phthalates and two terephthalates.•Compares the advantages and disadvantages of each…”
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Revisiting the dependence of retention factor on the content of organic component in the mobile phase in reversed‐phase HPLC by Moldoveanu, Serban C., Bacalum, Elena, Galaon, Toma, David, Victor

“…In high‐performance liquid chromatography, the dependence of retention factor k on volumetric fraction ϕ of organic phase is expressed by log k = F(ϕ) with…”
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Identification and Quantitation of Nicotine Polacrilex in Nicotine Pouches and Other Oral Nicotine Delivery Products by Moldoveanu, Serban C.

“…Nicotine polacrilex (CAS-No. 96055-45-7) can be used as the source of nicotine in nicotine pouches and other oral nicotine delivery products such as lozenges,…”
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Does phase ratio in reversed phase high performance liquid chromatography vary with temperature? by Soare, Andreia-Cristina, David, Victor, Moldoveanu, Serban C.

“…•Evaluates the phase ratio for three C18 columns at seven temperatures between 20 °C and 50 °C.•Shows that phase ratio in RP-HPLC varies with…”
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Retention factor variation on wide range of mobile phase compositions in reversed-phase high-performance liquid chromatography; a short tutorial by David, Victor, Moldoveanu, Serban C.

“…•Mobile phase composition has influence on the retention equilibrium.•Empirical equations for dependence between retention factor and organic…”
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Pyrolysis of organic molecules with applications to health and environmental issues by Moldoveanu, Șerban

“…Pyrolysis of Organic Molecules with Applications to Health and Environmental Issues, the 28th volume in the Techniques and Instrumentation in Analytical…”
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Free amino acids analysis by liquid chromatography with tandem mass spectrometry in several botanicals with antioxidant character by Moldoveanu, Serban C., Zhu, Jeff, Qian, Nancy

“…A novel method based on liquid chromatography with tandem mass spectrometry for the analysis of 19 amino acids in plant materials is described. For the…”
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Variation with Temperature of Phase Ratio in Reversed Phase HPLC for a Methanol/Water Mobile Phase by Soare, Andreia-Cristina, David, Victor, Moldoveanu, Serban C.

“…The ratio between the volume of the stationary phase and the void volume of column in HPLC is known as the phase ratio (denoted by Φ). In almost all the…”
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Results from solvophobic theory applied to methylene selectivity in reversed-phase HPLC by Moldoveanu, Serban C., Caiali, Edvin, David, Victor

“…A significant amount of work has been previously dedicated to the understanding of methylene selectivity parameter. The conventional theory applied for this…”
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Analysis of four pentacyclic triterpenoid acids in several bioactive botanicals with gas and liquid chromatography and mass spectrometry detection by Moldoveanu, Serban C, Scott, Wayne A

“…Several pentacyclic triterpenoid acids including betulinic, oleanolic, and ursolic acids were reported to have health beneficial properties such as antiviral…”
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Two Techniques for the Analysis of WS-3 With Potential Application to the Analysis of Other Cooling Agents by Moldoveanu, Serban C., Bussey, Robert O.

“…WS-3 (N-ethyl- -menthane-3-carboxamide) is a compound used as a cooling agent for tobacco or nicotine products. Three other similar compounds WS-23…”
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