黃寬 林艾和 范源
【摘 要】 目的:建立藏藥三果湯中沒(méi)食子基兒茶素沒(méi)食子酸酯(GCG)和表沒(méi)食子基兒茶素沒(méi)食子酸酯(EGCG)的HPLC含量測(cè)定方法。方法:Agilent Zorbax C18鍵合硅膠柱(150 mm×4.6 mm,5 μm);乙腈-0.1%磷酸梯度洗脫;流速:1.0 mL·min-1;檢測(cè)波長(zhǎng):280 nm;柱溫:25 ℃;進(jìn)樣量:10 μL。結(jié)果:EGCG和GCG在濃度0.0231~0.2310 mg·mL-1、0.0084~0.0840 mg·mL-1范圍內(nèi)呈良好的線性關(guān)系,相關(guān)系數(shù)均大于0.9990;加樣回收率分別為100.09%和99.52%,RSD值分別為0.95%和1.03%(n=6)。結(jié)論:建立HPLC法同時(shí)檢測(cè)藏藥三果湯中EGCG和GCG的含量,該方法簡(jiǎn)便、準(zhǔn)確、重復(fù)性好,結(jié)果可靠,可為藏藥三果湯中相關(guān)成分的質(zhì)控提供參考。
【關(guān)鍵詞】 HPLC;藏藥三果湯;沒(méi)食子基兒茶素沒(méi)食子酸酯;表沒(méi)食子基兒茶素沒(méi)食子酸酯
【中圖分類號(hào)】R927.2 【文獻(xiàn)標(biāo)志碼】 A 【文章編號(hào)】1007-8517(2021)08-0030-05
Abstract:Objective A high performance liquid chromatography (HPLC) method was established for the determination of epigallocatechin gallate (EGCG) and gallocatechin gallate (GCG) in Tibetan medicine Triphala Decoction.Methods The chromatographic column is an Agilent Zorbax C18 bonded silica column (150 mm×4.6 mm, 5 μm), the mobile phase is acetonitrile-0.1% phosphoric acid gradient elution, the flow rate is 1.0 mL·min-1, the detection wavelength is 280 nm, the column temperature is 25 ℃, and the injection volume is 10 μL.Results EGCG and GCG showed a good linear relationship in the concentration range of 0.0231~0.2310 mL·min-1 and 0.0084~0.0840 mL·min-1, and the correlation coefficients were both greater than 0.9990; the sample recovery rates were 100.09% and 99.52%, respectively, and the RSD value They are 0.95% and 1.03% respectively (n=6).Conciusion An HPLC method was established to simultaneously detect the contents of EGCG and GCG in Tibetan medicine Sanguo Decoction.This method is simple, accurate, reproducible, and reliable.It can provide a reference for the quality control of related components in Tibetan medicine Triphala Decoction.
Key words:HPLC; Tibetan Medicine Triphala Decoction; Epigallocatechin Gallate; Gallocatechin Galate
三果湯又名哲布湯,由訶子(Terminalia chebula)、毛訶子(Terminalia bellirica)和余甘子(Phyllanthus emblica)3味藥組成,為藏醫(yī)中重要的基礎(chǔ)方,《四部醫(yī)典》中記載,其具有治療瘟疫、紊亂熱癥、促使熱癥成型的作用[1]?,F(xiàn)代研究表明,三果湯主要含鞣質(zhì)酚酸類成分[2],具有抗菌[3]、抗炎[4-5]、抗腫瘤[6-7]、抗氧化[8]、抗輻射[9]、降糖[10]、降脂[11]、肝腎損傷的保護(hù)[12-13]等藥理作用。沒(méi)食子基兒茶素沒(méi)食子酸酯(gallocatechin gallate,GCG)、表沒(méi)食子基兒茶素沒(méi)食子酸酯(epigallocatechin gallate,EGCG)為兒茶素類物質(zhì),具有抗氧化、降脂、抗腫瘤、抗血栓等作用以及清除自由基活性等[14-18]。目前,尚無(wú)對(duì)三果湯中這兩個(gè)成分進(jìn)行定量分析的報(bào)道,為更全面地評(píng)價(jià)三果湯的質(zhì)量,本研究建立建立新的HPLC方法對(duì)三果湯中EGCG和GCG成分的含量進(jìn)行定量測(cè)定。
1 儀器與試劑
Agilent 1200高效液相色譜儀(美國(guó)Agilent公司),色譜柱為 Agilent Zorbax C18鍵合硅膠柱(150 mm×4.6 mm,5 μm);DFY-600搖擺式高速萬(wàn)能粉碎機(jī)(永康式速鋒工貿(mào)有限公司);T-1000型電子天平(上海浦春計(jì)量?jī)x器有限公司);AB265-SMETTLER TOLEDO十萬(wàn)分之一分析天平(Mettler-tolido international trade(Shanghai) co.LTD)。
表沒(méi)食子基兒茶素沒(méi)食子酸酯(EGCG批號(hào):wkq20051208,四川省維克奇生物科技有限公司)、沒(méi)食子基兒茶素沒(méi)食子酸酯(GCG批號(hào):wkq20051403,四川省維克奇生物科技有限公司);訶子、毛訶子、余甘子(批號(hào):20190803,安國(guó)市旭芳中藥材經(jīng)營(yíng)有限公司)。甲醇、乙腈為色譜純,其余試劑為分析純,水為超純水。
2 方法與結(jié)果
2.1 色譜條件 色譜柱為Zorbax C18(4.6 mm×250 mm,5 μm);流動(dòng)相:乙腈(A)-0.1%磷酸(B),梯度洗脫(0~8 min,8%~10% A;8 ~20 min,10%~15% A;20~50 min,15%~30% A;流速:1.0 mL·min-1;檢測(cè)波長(zhǎng):280 nm;柱溫:25 ℃;進(jìn)樣量:10 μL。理論塔板數(shù)按EGCG計(jì)算應(yīng)不低于5000,分離度均大于1.5。色譜圖如圖1所示。
2.2 溶液的制備
2.2.1 混合對(duì)照品溶液 分別精密稱取EGCG、GCG對(duì)照品2.31 mg、0.84 mg,置于10 mL量瓶中,用甲醇配制成EGCG、GCG濃度分別為0.2310 mg·mL-1和0.0840 mg·mL-1的混合對(duì)照品溶液。放置于4℃冰箱保存,臨用時(shí)放置至室溫。
2.2.2 供試品溶液 根據(jù)傳統(tǒng)藏醫(yī)藥中三果湯處方配比,訶子、毛訶子和余甘子3種藥材去核后按1∶[KG-*3/5]1∶[KG-*3/5]1的比例水煎制得[19],稱取取訶子、毛訶子、余甘子藥材(去核)各1.0 g,搗碎,加入100 mL餾水,浸泡30 min,煎煮3次,每次20 min,過(guò)濾,合并3次濾液,濃縮定容至50 mL容量瓶中,冷藏備用。制備成含生藥0.5 g·mL-1的三果湯水提物,吸取備用三果水提物1 mL,加50%甲醇定容于10 mL容量瓶中,用0.45 μm的微孔濾膜進(jìn)行過(guò)濾處理,即得到樣品溶液。
2.3 線性關(guān)系考察 分別精密稱取EGCG、GCG對(duì)照品11.55 mg、4.20 mg,置于50 mL量瓶中,用甲醇配制成EGCG、GCG濃度分別為0.2310 mg·mL-1和0.0840 mg·mL-1的混合對(duì)照品儲(chǔ)備液。精密吸取混合對(duì)照品儲(chǔ)備液各1、2、4、6、8、10 mL于10 mL量瓶中,分別加甲醇稀釋,得到EGCG分別為0.0231、0.0462、0.0924、0.1386、0.1848、0.2310 mg·mL-1;GCG分別為0.00840、0.0168、0.0336、0.0504、0.0672、0.084 mg·mL-1的6份不同質(zhì)量濃度的混標(biāo)溶液,精密吸取上述各溶液10 μL進(jìn)樣。以質(zhì)量濃度(mg·mL-1)為橫坐標(biāo)(X),峰面積(mAU*s)為縱坐標(biāo)(Y)進(jìn)行線性回歸,繪制標(biāo)準(zhǔn)曲線進(jìn)行回歸分析。EGCG回歸方程為Y=1391.4X-23.937,r=0.9996,表明EGCG在0.0231~0.2310 mg·mL-1范圍內(nèi)EGCG的峰面積與質(zhì)量濃度呈現(xiàn)良好的線性關(guān)系。GCG回歸方程為Y=3489.7X-59.47,r=0.9991,表明GCG在0.0084~0.0840 mg·mL-1范圍內(nèi)GCG的峰面積與質(zhì)量濃度呈現(xiàn)良好的線性關(guān)系。
2.4 精密度試驗(yàn) 精密吸取“2.2.2”項(xiàng)下混合對(duì)照品溶液,在“2.1”項(xiàng)條件下連續(xù)進(jìn)樣6次,結(jié)果顯示EGCG、GCG峰面積RSD分別為0.53%、0.67%,表明儀器精密度良好。
2.5 穩(wěn)定性試驗(yàn) 取同一份供試品溶液,在“2.1”項(xiàng)條件下,分別于2、4、6、8、10、12 h進(jìn)樣,結(jié)果顯示EGCG、GCG在10 h內(nèi)峰面積的RSD值分別為0.91%、1.14%,表明供試品溶液在12 h內(nèi)穩(wěn)定性良好。
2.6 重復(fù)性試驗(yàn) 取同一批訶子、毛訶子、余甘子藥材6份,按“2.2.3”項(xiàng)下方法制備供試品溶液,精密吸取6份供試品溶液各10 μL進(jìn)樣,結(jié)果顯示EGCG、GCG平均含量為12.26 mg/g、5.23 mg/g, RSD分別為1.51%、1.47%,表明該方法重復(fù)性良好。
2.7 加樣回收率試驗(yàn) 精密稱取9份已知含量的訶子、毛訶子、余甘子藥材各0.5 g,按1∶[KG-*3/5]1∶[KG-*3/5]1配制成三果湯,分別按照藥材含有量的80%、100%、120%加入混合對(duì)照品,按“2.2.3”項(xiàng)下方法制備供試品溶液,精密吸取10 μL在“2.1”項(xiàng)條件下進(jìn)樣。結(jié)果見(jiàn)表2。其中,供試品溶液以10 μL進(jìn)樣分析,測(cè)得EGCG和GCG均在標(biāo)準(zhǔn)曲線線性范圍內(nèi)。
2.8 含量測(cè)定 取6份不同批次三果湯樣品,按“2.2.2”項(xiàng)下方法制備供試品溶液,在“2.1”項(xiàng)下條件下進(jìn)樣,計(jì)算EGCG和GCG成分含有量,結(jié)果見(jiàn)表3。
3 討論
本試驗(yàn)分別對(duì)不同流動(dòng)相系統(tǒng)進(jìn)行考察,乙腈(甲醇)-0.1%磷酸、乙腈(甲醇)-0.2%磷酸等流動(dòng)相系統(tǒng),結(jié)果表明,乙腈-0.1%磷酸水溶液作流動(dòng)相進(jìn)行梯度洗脫時(shí),分離度較好且峰形尖銳。同時(shí)對(duì)柱溫(25、30、35℃)和流速(0.85、1.0、1.25、1.5 mL·min-1)進(jìn)行了優(yōu)化。結(jié)果顯示,柱溫25 ℃、流速 1.0 mL·min-1時(shí)分離效果好。本研究以EGCG和GCG作為三果湯水提物質(zhì)量控制指標(biāo),建立了HPLC同時(shí)測(cè)定三果湯水提物中EGCG和GCG含量的方法。該方法簡(jiǎn)便可行,結(jié)果準(zhǔn)確,可有效控制三果湯水提物的質(zhì)量,為藏藥三果湯的藥效物質(zhì)基礎(chǔ)研究提供基礎(chǔ)。
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(收稿日期:2020-09-07 編輯:劉 斌)