Xanthohumol
Xanthohumol
Chemical compound
Xanthohumol is a natural product found in the female inflorescences of Humulus lupulus, also known as hops. This compound is also found in beer and belongs to a class of compounds that contribute to the bitterness and flavor of hops.[2] Xanthohumol is a prenylated chalconoid, biosynthesized by a type III polyketide synthase (PKS) and subsequent modifying enzymes.[3][4]
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2′,4,4′-Trihydroxy-6′-methoxy-3′-(3-methylbut-2-en-1-yl)chalcone | |
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| ECHA InfoCard | 100.123.285  |
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| Properties | |
| C21H22O5 | |
| Molar mass | 354.402 g·mol−1 |
| Density | 1.24 g/cm3[1] |
| Melting point | 157–159 °C (315–318 °F; 430–432 K)[1] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Xanthohumol is a prenylated chalconoid derived from a plant type III PKS, and is synthesized in the glandular trichromes of hop cones.[2] L-Phenylalanine serves as the starting material, which is converted to cinnamic acid by the PLP-dependent phenylalanine ammonia lyase.[5][6] Cinnamic acid is oxidized by cinnamate-4-hydroxylase and loaded onto Coenzyme A (CoA) by 4-coumarate CoA ligase to yield 4-hydroxy-cinnamoyl CoA, the starter unit for PKS extension.[5][6] This molecule is extended three times with malonyl CoA, cyclized through a Claisen condensation, and aromatized through tautomerization to form naringenin chalcone (chalconaringenin).[5] This intermediate has the potential to form a variety of different products depending on the enzymes that modify the core structure.[2][5] In the case of xanthohumol, a prenyltransferase called Humulus lupulus prenyltransferase 1 (HlPT-1) attaches a molecule of dimethylallyl pyrophosphate from the DXP pathway.[7] HlPT-1 has a broad substrate specificity and also participates in making other prenylated flavonoids in the hop plant.[7] Finally, an O-methyltransferase methylates a phenol substituent using S-adenosyl methionine.[6] Total syntheses of xanthohumol and derivatives have been achieved, though extraction from hops remains a primary source.[8][9]
In commercial beers, the concentration of xanthohumol ranges from about 2 μg/L – 1.2 mg/L.[10] During the brewing process, xanthohumol and other prenylated flavonoids are lost as they are converted to the corresponding flavanones.[11] Different hop varieties and different beers contain varying quantities of xanthohumol.[2]
Xanthohumol is under basic research for its potential biological properties.[10] Xanthohumol can be extracted with pressurized hot water.[12]
- Isoxanthohumol, the corresponding prenylated flavanone
- 8-Prenylnaringenin, a related prenylflavanoid with anti-estrogenic activity
- Alpha acids, a class of bitter compounds in hops
- Myrcene, humulene, and caryophyllene, essential oils in hops
- Xanthohumol from hop (Humulus lupus), Santa Cruz Biotechnology
- Stevens, Jan F.; Page, Jonathan E. (May 2004). "Xanthohumol and related prenylflavonoids from hops and beer: to your good health!". Phytochemistry. 65 (10): 1317–1330. Bibcode:2004PChem..65.1317S. doi:10.1016/j.phytochem.2004.04.025. ISSN 0031-9422. PMID 15231405.
- Goese, Markus; Kammhuber, Klaus; Bacher, Adelbert; Zenk, Meinhart H.; Eisenreich, Wolfgang (1999-07-15). "Biosynthesis of bitter acids in hops". European Journal of Biochemistry. 263 (2): 447–454. doi:10.1046/j.1432-1327.1999.00518.x. ISSN 1432-1033. PMID 10406953.
- Wang, Guodong; Tian, Li; Aziz, Naveed; Broun, Pierre; Dai, Xinbin; He, Ji; King, Andrew; Zhao, Patrick X.; Dixon, Richard A. (November 2008). "Terpene biosynthesis in glandular trichomes of hop". Plant Physiology. 148 (3): 1254–1266. doi:10.1104/pp.108.125187. ISSN 0032-0889. PMC 2577278. PMID 18775972.
- Nagel, Jana; Culley, Lana K.; Lu, Yuping; Liu, Enwu; Matthews, Paul D.; Stevens, Jan F.; Page, Jonathan E. (January 2008). "EST analysis of hop glandular trichomes identifies an O-methyltransferase that catalyzes the biosynthesis of xanthohumol". The Plant Cell. 20 (1): 186–200. doi:10.1105/tpc.107.055178. ISSN 1040-4651. PMC 2254931. PMID 18223037.
- Tsurumaru, Yusuke; Sasaki, Kanako; Miyawaki, Tatsuya; Uto, Yoshihiro; Momma, Takayuki; Umemoto, Naoyuki; Momose, Masaki; Yazaki, Kazufumi (2012-01-06). "HlPT-1, a membrane-bound prenyltransferase responsible for the biosynthesis of bitter acids in hops". Biochemical and Biophysical Research Communications. 417 (1): 393–398. doi:10.1016/j.bbrc.2011.11.125. ISSN 1090-2104. PMID 22166201.
- Khupse, Rahul S.; Erhardt, Paul W. (2007-09-01). "Total Synthesis of Xanthohumol". Journal of Natural Products. 70 (9): 1507–1509. doi:10.1021/np070158y. ISSN 0163-3864. PMID 17844997.
- Zhang, Baoxin; Duan, Dongzhu; Ge, Chunpo; Yao, Juan; Liu, Yaping; Li, Xinming; Fang, Jianguo (2015-02-26). "Synthesis of Xanthohumol Analogues and Discovery of Potent Thioredoxin Reductase Inhibitor as Potential Anticancer Agent". Journal of Medicinal Chemistry. 58 (4): 1795–1805. doi:10.1021/jm5016507. ISSN 0022-2623. PMID 25629304.
- A. Gil-Ramírez, J.A. Mendiola, E. Arranz, A. Ruíz-Rodríguez, G. Reglero, E. Ibáñez, F.R. Marín. Highly isoxanthohumol enriched hop extract obtained by pressurized hot water extraction (PHWE). Chemical and functional characterization. Innovative Food Science and Emerging Technologies 2012 October, vol 16 Pages 54-60. doi: 10.1016/j.ifset.2012.04.006.