K0133 Sigma


≥90% (HPLC), powder

Synonym: 3,4′,5,7-Tetrahydroxyflavone, 3,5,7-Trihydroxy-2-(4-hydroxyphenyl)-4H-1-benzopyran-4-one, Robigenin

  • CAS Number 520-18-3

  • Empirical Formula (Hill Notation) C15H10O6

  • Molecular Weight 286.24

  •  Beilstein Registry Number 304401

  •  MDL number MFCD00016938

  •  PubChem Substance ID 24896195




Chromogenic reagent for antimony in the low ppm range and for gallium and indium in the sub-ppm range.

Biochem/physiol Actions

A flavonol shown to revert the transformed phenotype of phorbol ester-treated mouse fibroblasts or v-H-ras-transformed NIH 3T3 cells. Induces significant nuclear DNA degradation concurrent with lipid peroxidation. Inhibits topoisomerase I catalyzed DNA religation. Kaempferol may also inhibit the activity of fatty acid synthase.

Potent inhibitor of osteoclastic bone resorption. The effect is believed to be attributable to both the antioxidant and estrogenic activities of kaempferol.


Bottomless glass bottle. Contents are inside inserted fused cone.

Other Notes

Tandem Mass Spectrometry data independently generated by Scripps Center for Metabolomics is available to view or download in PDF. K0133.pdf Tested metabolites are featured on Scripps Center for Metabolomics METLIN Metabolite Database. To learn more, visit

Price and Availability

Expore Enzymes, Proteins & Cofactors

Celebrate Pi Day!
Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 
Protocols & Articles


Dietary Antioxidants

Antioxidants protect biological systems from oxidative damage produced by oxygen-containing free radicals and from redoxactive transition metal ions such as iron, copper, and cadmium.1 During the oxi...
Biofiles Volume 2 Article 2
Keywords: Adhesion, Anti-inflammatory agents, Applications, Cancer, Cardiovascular, Catalysis, Diabetes, Diseases, Gene expression, Metabolism, Neurodegenerative Diseases, Peroxidations, Phosphorylations, Prebiotics, Probiotics, Reductions, Transcription, Transduction, Vitamins

Fatty Acid Synthesis and Metabolism in Cancer Cells

Proliferatively active cells require fatty acids for functions such as membrane generation, protein modification, and bioenergetic requirements. These fatty acids are derived either from dietary sour...
Keywords: Apoptosis, Biofiles, Cancer, Carboxylations, Catalysis, Citric Acid Cycle, Gene expression, Glycolysis, Metabolism, Oxidations, PAGE, Phosphorylations

Peer-Reviewed Papers


Related Products

Technical Service:

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Bulk Ordering & Pricing:

Need larger quantities for your development, manufacturing or research applications?