From Wikipedia, the free encyclopedia
Jump to: navigation, search
CAS number 491-67-8 YesY
PubChem 5281605
ChemSpider 4444924 YesY
UNII 49QAH60606 YesY
Jmol-3D images Image 1
Molecular formula C15H10O5
Molar mass 270.24 g mol−1
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 YesY (verify) (what is: YesY/N?)
Infobox references

Baicalein (5,6,7-trihydroxyflavone) is a flavone, a type of flavonoid, originally isolated from the roots of Scutellaria baicalensis. It is also reported in Oroxylum indicum or Indian trumpetflower. It is the aglycone of baicalin.

The flavonoid has been shown to inhibit certain types of lipoxygenases[1] and act as an anti-inflammatory agent.[2]It has antiproliferative effects on ET-1-induced proliferation of pulmonary artery smooth muscle cell proliferation via inhibition of TRPC1 channel expression.[3] Possible antidepressant effects have also been attributed to baicalein in animal research.[4]

Baicalein is an inhibitor of CYP2C9,[5] an enzyme of the cytochrome P450 system that metabolizes drugs in the body.

A derivative of baicalin is a known prolyl endopeptidase inhibitor.[6]

It is one of the active ingredients of Sho-Saiko-To, a Japanese herbal supplement believed to enhance liver health.


Tetuin is the 6-glucoside of baicalein.

See also[edit]


  1. ^ Deschamps JD, Kenyon VA, Holman TR (June 2006). "Baicalein is a potent in vitro inhibitor against both reticulocyte 15-human and platelet 12-human lipoxygenases". Bioorg. Med. Chem. 14 (12): 4295–301. doi:10.1016/j.bmc.2006.01.057. PMID 16500106. 
  2. ^ Hsieh CJ, Hall K, Ha T, Li C, Krishnaswamy G, Chi DS (2007). "Baicalein inhibits IL-1β- and TNF-α-induced inflammatory cytokine production from human mast cells via regulation of the NF-κB pathway". Clin Mol Allergy 5 (1): 5. doi:10.1186/1476-7961-5-5. PMC 2206049. PMID 18039391. 
  3. ^ Yi-Ling Lin, Rong-Jyh Lin, Kuo-Pyng Shen, Zen-Kong Dai, Ing-Jun Chen, Jiunn-Ren Wu, Bin-Nan Wu, Baicalein, isolated from Scutellaria baicalensis, protects against endothelin-1-induced pulmonary artery smooth muscle cell proliferation via inhibition of TRPC1 channel expression, Journal of Ethnopharmacology, Volume 138, Issue 2, 18 November 2011, Pages 373-381, ISSN 0378-8741, 10.1016/j.jep.2011.09.014. (
  4. ^ Xiong Z, Jiang B, Wu PF, et al. (2011). "Antidepressant effects of a plant-derived flavonoid baicalein involving extracellular signal-regulated kinases cascade". Biol. Pharm. Bull. 34 (2): 253–9. doi:10.1248/bpb.34.253. PMID 21415537. 
  5. ^ Si Dayong, Wang Y, Zhou Y-H, Guo Y, Wang J, Zhou H, Li Z-S, Fawcett JP (March 2009). "Mechanism of CYP2C9 inhibition by flavones and flavonols". Drug Metabolism and Disposition 37 (3): 629–34. doi:10.1124/dmd.108.023416. PMID 19074529. 
  6. ^ Tarragó T, Kichik N, Claasen B, Prades R, Teixidó M, Giralt E. Baicalin, a prodrug able to reach the CNS, is a prolyl oligopeptidase inhibitor. Bioorganic and Medicinal Chemistry. 2008 Aug 1;16(15):7516-24. PMID 18650094