H
Hans Geiger
Researcher at University of Hohenheim
Publications - 31
Citations - 1639
Hans Geiger is an academic researcher from University of Hohenheim. The author has contributed to research in topics: High-performance liquid chromatography & Kaempferol. The author has an hindex of 15, co-authored 31 publications receiving 1600 citations.
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Carbon-13 NMR studies of flavonoids. III. Naturally occurring flavonoid glycosides and their acylated derivatives
TL;DR: In this article, 13 C NMR spectra for a variety of flavonoid glycosidcs are presented and analyzed, and evidence is presented which demonstrates that 13 C nMR spectroscopy is a valuable technique for distinguishing the sites of methylation, glycosylation and acylation in glycoiides.
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13C NMR studies of some naturally occurring amentoflavone and hinokiflavone biflavonoids
TL;DR: The 13C NMR spectra of a range of amentoflavone and hinokiflavone biflavonoids are reported, most for the first time as mentioned in this paper.
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Separation of flavonoids by reversed-phase high-performance liquid chromatography
TL;DR: In this article, the ability of a reversed phase high-performance liquid chromatographic system to separate flavonoids [LiChrosorb RP-18 and a combination of an isocratic and a gradient (5% aqueous formic acid and methanol) technique] was studied.
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Separation of phenolics (benzoic acids, cinnamic acids, phenylacetic acids, quinic acid esters, benzaldehydes and acetophenones, miscellaneous phenolics) and coumarins by reversed-phase high-performance liquid chromatography
TL;DR: In this paper, a reversed-phase system for the separation of simple phenolics and related substances is described, which consists of a LiChrosorb RP-18 (10 μm) Knauer column and a combination of isocratic and linear gradient elution (solvent a, water-formic acid (95:5); solvent B, methanol; temperature, 35°C).
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Absorption and fluorescence spectra, pKa values, and fluorescence lifetimes of monohydroxyflavones and monomethoxyflavones
TL;DR: The absorption and fluorescence spectra of all isomeric hydroxyflavones and methoxyflavone, except for the photolabile 3-methoxyflava, have been measured in organic solvents and in aqueous solutions of various acidity as mentioned in this paper.