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Related Concept Videos

Cancer Prevention02:59

Cancer Prevention

Several factors can increase the risk of cancer in an individual. About 50% of cancer cases can be prevented by adopting a healthy lifestyle, regular exercise, eating healthy, and following a modest cancer prevention diet. Epidemiological studies have consistently shown that populations with vegetable and fruit-rich diets have reduced the incidence of cancer. On the other hand, populations who have a diet rich in animal fat, red meat, junk food, or high calories are predisposed to cancer.
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Oxidation of Phenols to Quinones01:17

Oxidation of Phenols to Quinones

In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox property is crucial in...

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Flavonoids from Pseudotsuga menziesii.

Mirosława Krauze-Baranowska1, Paweł Sowiński, Anna Kawiak

  • 1Department of Pharmacognosy, Medical University of Gdańsk, Gen. J. Hallera 107 str., 80-416 Gdańsk, Poland. krauze@gumed.edu.pl

Zeitschrift Fur Naturforschung. C, Journal of Biosciences
|July 4, 2013
PubMed
Summary

Four new O-acylated flavonol glycosides were discovered in Pseudotsuga menziesii needles. These compounds, along with known flavonoids, were analyzed for potential cytotoxic activity against specific cancer cell lines.

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Area of Science:

  • Natural Product Chemistry
  • Phytochemistry
  • Organic Chemistry

Background:

  • Pseudotsuga menziesii (Douglas fir) is a conifer species with a rich source of secondary metabolites.
  • Flavonoids and their glycosides are known for diverse biological activities, including potential anticancer properties.
  • The chemical diversity within plant secondary metabolites offers opportunities for discovering novel bioactive compounds.

Purpose of the Study:

  • To isolate and characterize novel O-acylated flavonol glycosides from Pseudotsuga menziesii needles.
  • To identify known flavonoids present in the plant extract.
  • To evaluate the cytotoxic activity of the newly isolated compounds against selected human cancer cell lines.

Main Methods:

  • Isolation of compounds using chromatographic techniques.
  • Structure elucidation of novel compounds employing 1D and 2D Nuclear Magnetic Resonance (NMR) spectroscopy and Mass Spectrometry (MS).
  • Cytotoxicity assays performed on HL-60 (leukemia), HeLa (cervical cancer), and MDA-MB468 (breast cancer) cell lines.

Main Results:

  • Four new O-acylated flavonol glycosides, named daglesioside I, II, III, and IV, were successfully isolated and structurally characterized.
  • The structures reveal complex acylation patterns on kaempferol glycosides, including beta-truxinoyl and p-coumaroyl, and cinnamoyl groups.
  • Known flavonoids such as (E)-tiliroside, astragalin, kaempferol, and quercetin were also identified in the extract.
  • Compounds 1 (daglesioside I) and 3 (daglesioside III) exhibited cytotoxic activity against the tested cancer cell lines, indicating potential therapeutic value.

Conclusions:

  • Pseudotsuga menziesii needles are a source of novel O-acylated flavonol glycosides with unique chemical structures.
  • The identified compounds, particularly daglesioside I and III, demonstrate cytotoxic potential, warranting further investigation for anticancer drug development.
  • This study expands the known chemistry of flavonol glycosides and highlights the phytochemical richness of Douglas fir.