Synthese des Chrysins

Emilewicz, T.; Kostanecki, St. v.; Tambor, J.

doi:10.1002/cber.189903202190

Cited by 26 publications

(3 citation statements)

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“…Shortly thereafter Kostanecki proved the constitution of chrysin, and he also gave the names flavone (from Latin flavus , yellow) and flavonol to the parent ring system and its 3-hydroxy derivative. From the period of 1895 onwards, a considerable number of natural yellow coloring matters were examined, many of which have been proved to belong to the flavone or flavonol groups, and there can be no doubt that of all the natural dyes, these are much the most widely distributed in nature [57–60]. Between 1895 and 1920 Perkin investigated numerous plant materials containing flavones.…”

Section: Early Research On Propolismentioning

confidence: 99%

Historical Aspects of Propolis Research in Modern Times

Kuropatnicki

Szliszka

Król

2013

Evidence-Based Complementary and Alternative Medicine

249

195

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Propolis (bee glue) has been known for centuries. The ancient Greeks, Romans, and Egyptians were aware of the healing properties of propolis and made extensive use of it as a medicine. In the middle ages propolis was not a very popular topic and its use in mainstream medicine disappeared. However, the knowledge of medicinal properties of propolis survived in traditional folk medicine. The interest in propolis returned in Europe together with the renaissance theory of ad fontes. It has only been in the last century that scientists have been able to prove that propolis is as active and important as our forefathers thought. Research on chemical composition of propolis started at the beginning of the twentieth century and was continued after WW II. Advances in chromatographic analytical methods enabled separation and extraction of several components from propolis. At least 180 different compounds have been identified so far. Its antibacterial, antiseptic, anti-inflammatory, antifungal, anesthetic, and healing properties have been confirmed. Propolis has been effectively used in treatment of dermatological, laryngological, and gynecological problems, neurodegenerative diseases, in wound healing, and in treatment of burns and ulcers. However, it requires further research that may lead to new discoveries of its composition and possible applications.

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Section: Early Research On Propolismentioning

confidence: 99%

Historical Aspects of Propolis Research in Modern Times

Kuropatnicki

Szliszka

Król

2013

Evidence-Based Complementary and Alternative Medicine

249

195

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“…The structure was confirmed by synthesis (75,76). The same procedures were used to establish the structure of other flavones and in so doing the foundation of flavone chemistry was laid (77).…”

Section: Naphthoquinone Dyesmentioning

confidence: 99%

Dyes, Natural

Cofrancesco¹

2009

Kirk-Othmer Encyclopedia of Chemical Technology

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From the earliest times humans admired the beautiful natural colors of plants and minerals and sought to enhance human appearance by color. Ancient peoples used these dyes in cosmetics,food, and as medicine. The greatest use of natural dyes occurred when the art of weaving was developed. A few synthetic dyes were manufactured before 1856, but the big break through in synthetic dye manufacture came from Perkin who developed the synthesis for the dye Mauve. Synthetic dyes replaced natural dyes, but natural dyes are making a comeback. Hand dyeing is popular and there is an ever increasing demand for natural dyes as food colorings. This article discusses those natural dyes formerly manufactured. Basic categores include anthraquinones; napthoquinone dyes; indigoid dyes, and the natural food colors.The use of biogenic sources for color is a common practice, and for the most part, these do not produce adverse reactions. However, a few biogenic substances have been linked to allergic type reactions. Literature makes reference to carmine and annatto. Regulations of natural dyes are not numerous, but are discussed here.

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“…A. G. Perkin records his interest on seeing the fast red dyes used in calico prints and 'baticks' at the Colonial and Indian Exhibition in London in 1886. Important types of flavonoid were also recognised; flavones (chrysin 1.12 14 ), flavonols (quercitin 1.13, 15 morin 1.14 16 ), 3-hydroxyflavans (catechin 1.15 17 -without stereochemistry), dihydrochalcones (phloretin 1.16 18 ), and (in 1904) the biosynthetically important relationship between chalcones (butein 1.17) and flavanones (butin 1.18 19 ). These compounds can now be recognised as deriving in nature either from the acetate or the shikimate pathways (or both), which are the biogenetic routes by which the great majority of natural phenolics are formed.…”

Section: Don Whiting Was Educated At Southend-on-sea Boys' High Schoo...mentioning

confidence: 99%