Tricin

Tricin

Names
IUPAC name 5,7-dihydroxy-2-(4-hydroxy-3,5-dimethoxyphenyl)-4H-chromen-4-one
Other names Tricetin 3',5'-dimethyl ether 5,7-Dihydroxy-2-(4-hydroxy-3,5-dimethoxyphenyl)chromen-4-one
Identifiers
CAS Number	520-32-1
ChEMBL	ChEMBL454320
Jmol interactive 3D	Image
PubChem	5281702
SMILES COC1=CC(=CC(=C1O)OC)C2=CC(=O)C3=C(C=C(C=C3O2)O)O
Properties
Chemical formula	C17H14O7
Molar mass	330.29 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Tricin is a chemical compound. It is an O-methylated flavone, a type of flavonoid. It can be found in rice bran.^[1]

Glycosides

• Tricin 4'-glucoside (Tricin-4'-O-beta-D-glucopyranaoside, CAS number 71855-50-0)
• Tricin 5-glucoside (Tricin 5-O-beta-D-glucopyranoside, CAS number 32769-00-9)
• Tricin 7-O-glucoside (Tricin 7-O-beta-D-glucopyranoside, CAS number 32769-01-0)

Biosynthesis

The biosynthesis of flavones has not yet been elucidated in full; however, most of the mechanistic and enzymatic steps have been discovered and studied. In biosynthesizing tricin, there is first stepwise addition of malonyl CoA via the polyketide pathway and p-coumaroyl Coa via the phenylpropanoid pathway.^[2] These additions are mediated by the sequential action of chalcone synthase and chalcone isomerase to yield naringenin chalcone and the flavanone, naringenin, respectively. CYP93G1 of the CYP P450 superfamily in rice then desaturates naringenin into apigenin. After this step, it is proposed that flavonoid 3’5’-hydroxylase (F3’5’H) changes apigenin into tricetin.^[3] Upon formation of tricetin, 3’-O-methyltransferase and 5’-O-methyltransferase adds methoxy groups to tricetin to form tricin.

p-Coumaroyl CoA and Malonyl Coa units are synthesized together to form Naringenin. The biosynthetic pathway then follows to form Tricin.

Other compounds formed from tricin

Three flavonolignans derived from tricin have been isolated from oats Avena sativa.^[4]

External links

• http://www.chemblink.com/products/520-32-1.htm

References

1. The rice bran constituent tricin potently inhibits cyclooxygenase enzymes and interferes with intestinal carcinogenesis in ApcMin mice
2. Tricin—a potential multifunctional nutraceutical. Zhou J, Ibrahim R. Phytochem., 2010, Rev. 9:413-424
3. CYP93G1 is a flavone synthase II which channels flavanones to the biosynthesis of tricin O-linked conjugates in rice. Lam P, Zhu F, Chan W, Liu H, Lo C. Plant Physiology Preview, 2014.
4. Flavonolignans from Avena sativa. Eva Wenzig, Olaf Kunert, Daneel Ferreira, Martin Schmid, Wolfgang Schühly, Rudolf Bauer and Alois Hiermann, J. Nat. Prod., 2005, 68 (2), pp 289–292