Ludwig Hörhammer

Bio: Ludwig Hörhammer is an academic researcher from Ludwig Maximilian University of Munich. The author has contributed to research in topics: Orientin & Vitexin. The author has an hindex of 15, co-authored 87 publications receiving 668 citations.

Untersuchungen über die Glykoside von Centaurea jacea L., II. Die Struktur des Centaureins und dessen Synthese aus dem Aglucon und Acetobromglucose

Abstract: Fur ein neues, bisher noch nicht bekanntes Flavon aus den oberirdischen Sprosteilen von Centaurea jacea L. (Jacein) wurde die Struktur eines 5.7.4′-Trihydroxy-3.6.3′-trimethoxy-flavon-7-β-D-monoglucosids ermittelt und durch Synthese seines Triathylderivates sichergestellt. Das Jacein ist isomer mit einem bereits fruher isolierten Flavonglykosid aus der Wurzel (Centaurein), dem bereits fruher isolierten Flavonglykosid aus der Wurzel (Centaurein), dem nunmehr die Konstitution eines 5.7.3′-Trihydroxy-3.6.4′-trimethoxy-flavon-7-β-D-monoglucosids zukommt.

Über die Synthese von Quercetin‐3‐glykosiden, I. Synthese und Strukturbeweis von Isoquercitrin, Hyperosid und Quercitrin

Abstract: Durch Umsetzung von 7.4′-Dibenzyl-quercetin mit den entsprechenden Acetobromzuckern, anschliesende Verseifung und katalytische Entbenzylierung wurden Isoquercitrin (Quercetin-3-β-d-glucosid), Hyperosid (Quercetin-3-β-d-galaktosid) und Quercitrin (Quercetin-3-α-l-rhamnosid) synthetisch dargestellt.

Phenolics in food and nutraceuticals

Abstract: Phenolics in Food and Nutraceuticals is the first single-source compendium of essential information concerning food phenolics. This unique book reports the classification and nomenclature of phenolics, their occurrence in food and nutraceuticals, chemistry and applications, and nutritional and health effects. In addition, it describes antioxidant activity of phenolics in food and nutraceuticals as well as methods for analysis and quantification. Each chapter concludes with an extensive bibliography for further reading. Food scientists, nutritionists, chemists, biochemists, and health professionals will find this book valuable.

Thin-layer chromatography of lipids

Abstract: Technique Thin-Layer Chromatography as an Analytical Tool Qualitative Analysis Quantitative Analysis Thin-Layer Chromatography as a Preparative Tool

Sesquiterpene lactones as taxonomic characters in the asteraceae

Abstract: The Asteraceae is characterized by structurally diverse sesquiterpene lactones and furanosesquiterpenes. In this review the tribal, subtribal and generic distribution of sesquiterpene lactones is examined and the compounds’ utility as taxonomic characters discussed. Sesquiterpene lactones fulfill the major requirements for good analytic and synthetic characters. Studies of infraspecific sesquiterpene lactone variation indicate that different elements within complex taxa are often defined by distinct chemistries, termed chemotypes. Chemotypes have been identified within many of the thoroughly investigated taxa:Ambrosia camphorata, A. chamissonis, A. confertiflora, theA. cumanensis-A. psilostachya-A. artemisiifolia complex,A. dumosa, Artemisia tridentata, Gaillardia pulchella andMelampodium leucanthum. Such an analytic usage is mostly restricted to the infraspecific level. Synthetic usage at the interspecific level and above profits from the application of a biogenetically based methodology for sorting out the complex molecules’ carbon-skeletal and substitutional features into unit characters. Cladistics or Hennigian phylogenetic systematics provides a useful framework for such an analysis. Preliminary surveys indicate that sesquiterpene lactones are especially good characters for differentiating subtribes within several major tribes: the Vernonieae, Heliantheae and Mutisieae. As yet, too few data are available for other tribes to discern such patterns. Species surveys inVernonia, Ambrosia, Iva, Parthenium,Tetragonotheca andArtemisia demonstrate that sesquiterpene lactones are useful in discerning infrageneric groups. The biogenetic cladistic analysis of the interspecific sesquiterpene lactone variation inIva shows the efficacy of this analytical methodology. At present, such biogenetically based approaches are impeded by limited biosynthetic evidence and the erratic distribution of sesquiterpene lactones within the family. Instances of apparent displacement of sesquiterpene lactones by other terpenoids (i.e. sesquiterpene furans, alcohols and acids, diterpenes, diterpene acids, etc.) at various taxonomic levels suggest that ultimately sesquiterpene lactones must be interpreted as taxonomic characters in the context of the family’s total terpene chemistry. All taxa from which sesquiterpene lactones have been reported are listed together with the compound names, major structural features and the literature cited. A less-complete listing is provided for taxa producing furanosesquiterpenes. Structures for all reported compounds are included. Two appendices listing alphabetically taxa and compounds and relevant text page numbers permit cross-indexing of plants and compounds.