槲皮素
檞皮素(quercetin)又稱五羥黃酮、檞黃酮,又稱櫟精[1],是一種植物性黃酮醇,屬於多酚中的黃酮類化合物,存在於水果、蔬菜和穀物等植物中。
檞皮素 | |
---|---|
IUPAC名 2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4H-chromen-4-one | |
別名 | 櫟精 五羥黃酮 檞黃酮 |
識別 | |
CAS號 | 117-39-5 |
PubChem | 5280343 |
ChemSpider | 4444051 |
SMILES |
|
InChI |
|
InChIKey | REFJWTPEDVJJIY-UHFFFAOYAW |
KEGG | C00389 |
性質 | |
化學式 | C15H10O7 |
摩爾質量 | 302.236 g·mol⁻¹ |
密度 | 1.799 g/cm3 |
熔點 | 316 °C |
若非註明,所有數據均出自標準狀態(25 ℃,100 kPa)下。 |
檞皮素廣泛存在於自然界中。其英文名「quercetin」最早出現於1857年,其來源於「quercetum」,意為櫟樹林。[2][3]其是一種天然的生長素極性運輸抑制劑。[4]
檞皮素含量豐富的食品包括:茶葉(茶樹;2000-2500 mg/kg),刺山柑(1800 mg/kg)[5],歐當歸(1700 mg/kg),蘋果(44 mg/kg),紅洋蔥(1910 mg/kg,最外層的含量最高[6]),紅葡萄,柑橘、蕃茄、花椰菜及其他綠葉蔬菜。此外還有許多漿果的含量也較高,包括覆盆子、歐洲越橘(158 mg/kg,鮮重),越橘(種植74 mg/kg,野生146 mg/kg),蔓越莓(種植83 mg/kg,野生121 mg/kg),沙棘(62 mg/kg),岩高蘭(種植53 mg/kg,野生56 mg/kg)[7]及仙人掌的果實。2007年一項研究發現,有機種植的番茄檞皮素含量比傳統種植的高出79%。[8]
苷元
檞皮素是許多其他類黃酮苷的苷元。槲皮素與鼠李糖結合形成檞皮苷;與芸香糖結合形成蘆丁;與阿拉伯糖結合形成番石榴苷;與乳糖結合形成金絲桃苷。
生理活性
對大鼠生物利用度的研究顯示,當放射性同位素標記的槲皮素-4-葡萄糖苷通過胃腸道後,其被轉化為酚酸。[11]
檞皮素既尚未被科學的證明其具有任何療效,也沒有得到任何監管機構的批准。美國食品與藥品管理局尚未批准任何關於槲皮素的功效說明。[12]不過達沙替尼和槲皮素的混合物也一種潛在的返老藥(Senolytic),一項人體初步臨床試驗顯示,達沙替尼和槲皮素的混合物在患有糖尿病腎臟病變的人類患者中,確實會降低部分組織當中衰老細胞的數量。[13]
炎症
一些實驗室的研究表明槲皮素可能具有抗炎特性[14][15],並在研究其潛在的療效。[15][16]
檞皮素可減輕花粉熱的症狀。[17]其一種酶改性衍生物被發現具有減輕花粉熱眼部症狀的作用。[18][19][20]
一項對老鼠的研究表明,槲皮素能有效的減少速釋型煙酸引起的潮紅現象,部分途徑為減少前列腺素D2的產生。[21]一個四人的試驗性臨床試驗給出的初步數據支持該觀點。[22]
癌症
實驗室體外細胞研究顯示,檞皮素也可轉變為致癌物,但這項研究並沒有報告其會增加動物或人類的患癌風險。[23][24][25]
美國癌症協會說道,雖然檞皮素「已被選為對許多包括癌症的疾病有效的物質」,並且「一些早期的實驗結果顯示其具有開發前景,但現在還沒有可靠的臨床證據說明檞皮素可以預防或治療人類癌症。」充足的水果和蔬菜的攝入可能降低患癌症的風險[26],槲皮素是許多可能的作用源之一受到研究。
在動物實驗中,檞皮素被推測有可能降低患某些癌症的風險。[27][28]一項時長8年的研究發現,三種黃酮類化合物——山柰酚、檞皮素和楊梅素——可降低吸煙者患胰腺癌的風險。[29]
通過檞皮素與超聲波結合,可抑制體外培養的皮膚癌和前列腺癌細胞。[30]
代謝
檞皮素已被證明可增加大鼠的能量代謝,但僅限於短期(短於8周)。[14]檞皮素對小鼠運動耐受性的影響與增加線粒體生物合成有關。[15]小鼠口服12.5至25 mg/kg濃度依次增加的檞皮素,可增加線粒體生物標誌物的基因表達,並可改善運動耐受性。.[31]
已有有關於檞皮素對結節病、哮喘、肥胖與糖尿病的葡萄糖吸收的安全性和有效性的初步研究。[32]
藥物相互作用
檞皮素有一些抗生素配伍禁忌;其可能影響氟喹諾酮的作用,因檞皮素也具有競爭結合DNA旋轉酶的能力。尚未確定其是否能抑制或增強氟奎諾酮的效果。[36]
《AHFS藥物信息》(2010年)[37]將檞皮素標記為CYP2C8的抑制劑,並具體的說明其與紫杉醇可能形成有害的相互作用。由於紫杉醇由CYP2C8代謝,其生物利用度可能增加或不可預測,可能導致毒副作用。[38][39]
此外,檞皮素還被描述為CYP2C9的抑制劑[40],及CYP3A4的抑制劑[41]和誘導劑[42]。CYP2C9和CPY3A4都是細胞色素P450混合功能氧化酶系統的組分,因此這些酶參與外來物質的代謝。
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