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



Related Categories Antioxidant and Free Radical Scavengers, Biochemicals and Reagents, Bioflavonoids, Cancer Metabolism, Cancer Research,
assay   ≥90% (HPLC)
form   powder
storage condition   protect from light
color   yellow
solubility   ethanol: soluble20 mg/mL
  DMSO: soluble50 mg/mL
storage temp.   room temp
Gene Information   human ... CDC2(983), CDK5(1020), CDK6(1021), CYP1A2(1544), CYP2C9(1559), GSK3A(2931)
mouse ... Hexa(15211)



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

Suggested Laboratory Gloves

Laboratory GlovesThis substance has been tested against several types of hand protection for CE compliance. Click below to find the recommended gloves for handling this product.

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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

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