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中国精品科技期刊2020

大果木姜子挥发油的提取工艺优化、成分分析及抗氧化活性

刘杰, 郭江涛, 刘耀, 程纯, 黄凯, 简梨娜, 徐剑, 张永萍

刘杰,郭江涛,刘耀,等. 大果木姜子挥发油的提取工艺优化、成分分析及抗氧化活性[J]. 食品工业科技,2022,43(19):211−219. doi: 10.13386/j.issn1002-0306.2021120007.
引用本文: 刘杰,郭江涛,刘耀,等. 大果木姜子挥发油的提取工艺优化、成分分析及抗氧化活性[J]. 食品工业科技,2022,43(19):211−219. doi: 10.13386/j.issn1002-0306.2021120007.
LIU Jie, GUO Jiangtao, LIU Yao, et al. Extraction Optimization, Composition Analysis of Volatile Oil from Litsea lancilimba Merr. and Its Antioxidant Activity[J]. Science and Technology of Food Industry, 2022, 43(19): 211−219. (in Chinese with English abstract). doi: 10.13386/j.issn1002-0306.2021120007.
Citation: LIU Jie, GUO Jiangtao, LIU Yao, et al. Extraction Optimization, Composition Analysis of Volatile Oil from Litsea lancilimba Merr. and Its Antioxidant Activity[J]. Science and Technology of Food Industry, 2022, 43(19): 211−219. (in Chinese with English abstract). doi: 10.13386/j.issn1002-0306.2021120007.

大果木姜子挥发油的提取工艺优化、成分分析及抗氧化活性

基金项目: 国家自然科学基金委员会-贵州省人民政府联合基金(No.U1812403-2); 黔科合基础-ZK[2022]一般463;黔教合YJSKYJJ〔2021〕164;黔教技[2022]022号;贵州省高层次创新型人才“百层次人才”项目(黔科合平台人才〔2015〕4030号)。
详细信息
    作者简介:

    刘杰(1985−),女,博士,副教授,研究方向:中药民族药药效物质基础及新药,E-mail:271247239@qq.com

    通讯作者:

    徐剑(1977−),男,硕士,教授,研究方向:中药新剂型新制剂,E-mail:10423108@qq.com

    张永萍(1965−),女,本科,教授,研究方向:中药新剂型新制剂,E-mail:642055255@qq.com

  • 中图分类号: TS224

Extraction Optimization, Composition Analysis of Volatile Oil from Litsea lancilimba Merr. and Its Antioxidant Activity

  • 摘要: 为研究大果木姜子挥发油的最优提取工艺及其成分组成和抗氧化活性,以大果木姜子挥发油得率为指标,在单因素实验基础上,采用响应面法对提取工艺进行优化;采用气相色谱-质谱法(GC-MS)分析挥发油的组成;运用清除DPPH·试验初步评价大果木姜子挥发油的体外抗氧化活性。结果表明,最佳提取工艺为浸泡时间5 h,料液比1:5 g/mL,提取时间8 h,在上述条件下,实际得率为10.67%。从大果木姜子挥发油中鉴定出74个成分,占挥发油总量的93.175%,其中相对含量高于3%的分别为1,8-桉叶素(21.854%)、正癸酸(12.893%)、β-蒎烯(4.873%)、对伞花烃(4.579%)、α-蒎烯(4.452%)、月桂酸(3.734%)、α-萜品烯醇(3.188%);大果木姜子挥发油抗氧化活性随着浓度的增加而逐渐升高,当浓度在1.0~6.0 mg/mL范围内时,最高清除率为92.94%。优化的工艺适用于大果木姜子挥发油的提取,大果木姜子挥发油中含有多种成分,其中以萜类、烃类及酸类成分为主,抗氧化结果提示其具有一定的体外抗氧化能力。
    Abstract: In order to study the optimal extraction process, composition and antioxidant activity of the Litsea lancilimba Merr. volatile oil, using the extraction rate of the Litsea lancilimba Merr. volatile oil as index, based on the single factor test, the response surface method was used to investigate the extraction process; GC-MS was used to analysis the composition of volatile oil; DPPH· scavenging test was used to evaluate the in vitro antioxidant activity of Litsea lancilimba Merr. volatile oil. The results showed that the best extraction process was soak time 5 h, 5 times the material-liquid ratio, and extraction time 8 h. Under the above conditions, the extraction rate was 10.67%. 74 components were identified from the Litsea lancilimba Merr. volatile oil by GC-MS, accounting for 93.175% of the total volatile oil. Among them, the relative contents higher than 3% were 1, 8-cineole (21.854%), n-decanoic acid (12.893%), β-pinene (4.873%), p-cymene (4.579%), α-pinene (4.452%), lauric acid (3.734%), α-terpinenol (3.188%). The total antioxidant activity of Litsea lancilimba Merr. volatile oil gradually increased with the increase of the concentration. When the concentration was in the range of 1.0~6.0 mg/mL, the highest clearance rate was 92.94%. The optimized process was suitable for the extraction of Litsea lancilimba Merr. volatile oil. There were many components in the Litsea lancilimba Merr. volatile oil, among which terpenoids, hydrocarbons and acids were the main components. The antioxidant results indicate that it has a certain in vitro antioxidant capacity.
  • 大果木姜子(Litsea lancilimba Merr.)为樟科樟属植物米槁(Cinnamomum migao C)的干燥成熟果实,又名毛丹母、青吐木等,主要分布在我国贵州、广西、云南等西北地区[1]。大果木姜子为药食两用植物,贵州民间多直接将其腌制做泡菜食用。大果木姜子油不仅可以用于调味、去腥,起到健脾开胃的效果,还具有抗心绞痛[2-3]、抗肿瘤[4-5]、抗炎镇痛[6]、抑菌[7]等药理作用,近年来陆续有相关制剂如:理气活血滴丸、心胃丹胶囊、米槁心乐滴丸、米槁精油滴丸上市[8]。研究表明挥发油类成分是大果木姜子的活性成分,且有报道挥发油类成分具有极好的抗氧化作用,可作为潜在的天然抗氧化剂使用[9-11],但目前并无大果木姜子挥发油抗氧化作用的相关报道。

    挥发油常用的提取方法包括水蒸气蒸馏法[12]、超临界CO2萃取法[13]及超声辅助提取法[14],其中,水蒸气蒸馏法因不使用有机溶剂、不会对提取得到的挥发油造成污染、成本低等优点,仍是使用最为广泛的经典方法[15],但参考文献中采用水蒸气蒸馏法提取大果木姜子挥发油得率均较低,造成了大果木姜子植物资源的浪费[16-17]。基于此,本实验以大果木姜子为原料,采用水蒸气蒸馏法提取其挥发油,利用响应面法优化提取工艺,同时采用气相色谱-质谱法(GC-MS)对最优工艺提取得到的挥发油进行成分及相对含量分析,并探讨大果木姜子挥发油清除DPPH·的活性,以期为大果木姜子挥发油的充分利用及在抗氧化方面的研究及开发利用奠定基础,为大果木姜子的合理开发利用提供依据。

    大果木姜子(Litsea lancilimba Merr.) 贵州省黔西南州册亨县双江镇林木村,经贵州中医药大学孙庆文教授鉴定,该品为樟科樟属植物米槁(Cinnamomum migao.C)的干燥成熟果实;维生素C(纯度≥99.0%) 成都第一制药有限公司;DPPH(1,1-二苯基-2-三硝基苯肼,纯度≥97.0%) 梯希布(上海)化成工业发展有限公司;无水乙醇(乙醇质量分数≥99.7%) 天津市富宇精细化工有限公司。

    6890-5975C型气相色谱-质谱联用仪 美国安捷伦公司;TU-1810型紫外可见分光光度计 北京普析通用仪器有限公司;JM·A1002型电子天平 余姚纪铭称重校验设备有限公司;RRH-A1000型高速多功能粉碎机 上海绿沃工贸有限公司,RE-2000A型旋转蒸发仪 上海亚荣生化仪器厂;ZNHW型数显电热套 上海力辰邦西仪器科技有限公司;GG-17挥发油测定器 蜀牛玻璃仪器有限公司。

    按2020版《中国药典》(四部)通则2204“挥发油测定法甲法”提取大果木姜子挥发油。取供试品20 g,粉碎至颗粒度为35目,以水为提取溶剂在一定料液比下浸泡一段时间,在一定的电热套功率下提取一定时间后,静置1 h,于挥发油测定器下端缓慢放掉水层,于水油交界处开始收集挥发油,以13000 r/min离心10 min使油水分离后,采用移液枪吸取上层油相,即得大果木姜子挥发油[18]

    精密称取35目大果木姜子粉末20 g,料液比为1:7(g/mL),浸泡时间分别为0、1、2、3、4、5 h,在电热套功率为100 kW下提取8 h,静置1 h后分离挥发油,考察浸泡时间对挥发油得率的影响。

    精密称取35目大果木姜子粉末20 g,料液比为1:7(g/mL),浸泡3 h,分别在电热套功率为60、100、140、180、220 kW下提取8 h,静置1 h后分离挥发油,考察不同提取功率对挥发油得率的影响。

    精密称取35目大果木姜子粉末20 g,料液比分别为1:3、1:4、1:5、1:6、1:7(g/mL),浸泡3 h,在电热套功率为100 kW下提取8 h,静置1 h后分离挥发油,考察不同料液比对挥发油得率的影响。

    精密称取35目大果木姜子粉末20 g,料液比为1:7(g/mL),浸泡3 h,在电热套功率为100 kW下提取,提取时间分别为2、4、6、8、10、12 h,静置1 h后分离挥发油,考察不同提取时间对挥发油得率的影响。

    大果木姜子中油类成分含量高,物料颗粒过细将无法过筛,故固定物料颗粒度为35目。选取浸泡时间(A)、料液比(B)和提取时间(C)作为Box-Behnken试验设计的3个因素,以大果木姜子挥发油得率为响应值,结合响应面法的设计原理[19],设计三因素三水平的响应面试验,因素水平表见表1

    表  1  大果木姜子挥发油响应面因素水平表
    Table  1.  Response surface factor level table of the volatile oil of Litsea lancilimba Merr.
    因素水平
    −101
    A浸泡时间(h)02.55
    B料液比(g/mL)1:21:41:6
    C提取时间(h)6810
    下载: 导出CSV 
    | 显示表格

    设定挥发油质量为m1,药材样品质量为m2。大果木姜子挥发油得率按下式计算:

    W=m1m2×100

    式中:W表示大果木姜子挥发油得率,%;m1表示大果木姜子挥发油重量,g;m2表示大果木姜子重量,g。

    色谱条件[18]:色谱柱为HP-5 MS(60 m×0.25 mm×0.25 μm)弹性石英毛细管柱,柱温70 ℃,保持2 min,以3 ℃/min升温至190 ℃,以10 ℃/min升温至310 ℃,运行时间:54 min;汽化室温度250 ℃;载气为高纯He(99.999%);柱前压18.34 psi,载气流量1.0 mL/min;分流进样,分流比:50:1;溶剂延迟时间:6 min。

    质谱条件:离子源为EI源;离子源温度230 ℃;四极杆温度150 ℃;电子能量70 eV;发射电流34.6 μA;倍增器电压1953 V;接口温度280 ℃;质量范围29~500 amu。

    将大果木姜子挥发油用无水乙醇配制成浓度为0.5、1、1.5、2、4、6、8、10 mg/mL八个浓度,各取2 mL,加入0.080 mg/mL的DPPH·贮备液2 mL,摇匀,避光静置30 min后,以无水乙醇为参比液,测定反应体系在波长517 nm处的吸光度(Ai),同时测定2 mL DPPH·溶液与等体积无水乙醇混合液的吸光度(Ac)及2 mL试样液与等体积无水乙醇混合液的吸光度(Aj),维生素C作为阳性对照(浓度分别为0.5、1、1.5、2、4、6、8、10 μg/mL)[20-21]

    DPPH自由基清除率按下式来计算:

    DPPH(%)=Ac(AiAj)Ac×100

    采用Excel 2010、SPSS 23.0、Prism 8.0.1进行数据统计分析,P<0.05表示差异显著,P<0.01表示差异极显著,所有数据均表示为平均值±标准差。Design-Expert V8.0.6软件进行响应面分析。

    结果见图1:不同浸泡时间下挥发油得率存在显著性差异(P<0.05)。浸泡时间在0~3 h之间时,挥发油得率随着时间的延长而增加,2 h和3 h之间存在显著性差异;当浸泡时间≥3 h时,挥发油的得率达到最高,为10.44%,各组之间无显著性差异,得率不再随时间的延长而增加。可能是由于此时浸提液已经达到饱和状态,再继续浸提会使杂质成分溶出,与挥发油竞争溶出空间导致得率下降[22]。考虑到实验时间及成本,故在做响应面试验时,选取浸泡时间为0、2.5和5.0 h三个水平。

    图  1  浸泡时间对大果木姜子挥发油得率的影响
    注:不同小写字母表示差异显著(P<0.05),图2~图4同。
    Figure  1.  Effect of soak time on the yield of Litsea lancilimba Merr. volatile oil

    结果见图2:电热套不同提取功率下挥发油得率无显著性差异(P>0.05)。当电热套提取功率>100 kW时,挥发油得率呈现逐渐降低的趋势,可能是随着提取功率的增大,局部提取温度升高,导致部分挥发油成分被破坏[23],得率下降。但总体变化较小,表明提取功率对挥发油得率的影响不大。因此后续实验固定提取功率为100 kW。

    图  2  提取功率对大果木姜子挥发油得率的影响
    Figure  2.  Effect of extraction power on the yield of Litsea lancilimba Merr. volatile oil

    结果见图3:不同料液比下挥发油得率存在显著性差异(P<0.05)。随着料液比的增加,挥发油的得率出现先增加后减小的趋势。当料液比为1:5、1:6 g/mL时,挥发油的得率达到最高,继续增加料液比,挥发油的得率呈现下降趋势,可能是因为在一定的料液比范围内,挥发油的浸出传质系数升高,但当料液比过大时,反而减慢了挥发油的扩散速度[24]。结合实际情况,在做响应面试验时,选取料液比1:2、1:4和1:6 g/mL作为三个水平。

    图  3  料液比对大果木姜子挥发油得率的影响
    Figure  3.  Effect of material-liquid ratio on the yield of Litsea lancilimba Merr. volatile oil

    结果见图4:不同提取时间下挥发油得率存在显著性差异(P<0.05)。随着提取时间的增加,得率逐渐增加。当提取时间为8 h时,增幅变缓;当提取时间≥10 h时,得率不再增加,可能是因为此时挥发油溶液趋于饱和,继续提取反而导致挥发油中的成分损失[22]。考虑到提取时间为8 h后的得率增幅较小,结合实际提取成本,选取浸泡时间6、8和10 h作为三个水平。

    图  4  提取时间对大果木姜子挥发油得率的影响
    Figure  4.  Effect of extraction time on the yield of Litsea lancilimba Merr. volatile oil

    以浸泡时间、料液比和提取时间为自变量,大果木姜子的挥发油得率为因变量,采用Design-Expert软件对各因素回归分析,以确定大果木姜子挥发油的最优提取工艺,结果见表2

    表  2  大果木姜子挥发油响应面试验设计与结果
    Table  2.  Response surface experiment design and results of Litsea lancilimba Merr. volatile oil
    实验号A浸泡时间B料液比C提取时间得率(%)
    11−108.37
    200010.47
    31019.37
    41109.74
    500010.43
    600010.19
    700010.08
    8−1109.14
    90−118.72
    10−1019.44
    11−1−108.40
    1210−19.87
    1300010.17
    14−10−17.96
    1501−18.46
    160−1−18.40
    170119.72
    下载: 导出CSV 
    | 显示表格

    模型P<0.01,表明回归模型极显著。失拟项P>0.05,表明失拟项不显著。从F值可以看出,在所选的各因素水平范围内,料液比对挥发油得率的影响最大,提取时间影响次之,浸泡时间的影响最小。在此模型中,一次项B、二次项A2、B2和C2、交互项AC对结果影响极显著(P<0.01),一次项A、C对结果影响显著(P<0.05),其他各项均对试验影响不显著,提示各试验因子与响应值不是简单的线性关系。对各因素进行拟合,得到二次回归方程:Y=10.27+0.30A+0.39B+0.32C+0.16AB−0.49AC+0.23BC−0.51A2−0.85B2−0.60C2。模型中回归方程的决定系数R2=0.9536,校正测定系数R2adj=0.8939,说明模型精确度高,试验设计可靠,可准确地对试验结果进行预测和分析,变异系数CV=2.87%,表明试验结果与真实值存在2.87%的偏差,模型可靠性较高。噪音信号比为10.824(>4),说明本模型能真实地反映实验结果[25]。结果见表3

    表  3  大果木姜子挥发油响应面方差分析
    Table  3.  Response surface variance analysis of volatile oil of Litsea lancilimba Merr.
    方差来源平方和自由度均方差FP显著性
    模型10.3191.1516.030.0007**
    A0.7210.7210.080.0156*
    B1.2411.2417.410.0042**
    C0.8210.8211.460.0117*
    AB0.110.11.40.275
    AC0.9710.9713.620.0077**
    BC0.2210.223.030.1253
    A21.111.115.450.0057**
    B23.0113.0142.150.0003**
    C21.511.521.020.0025**
    残差0.570.071
    失拟差0.3830.134.320.0956
    纯误差0.1240.029
    总离差10.8116
    注:*表示P<0.05,结果具有显著性,**表示P<0.01,结果具有极显著性。
    下载: 导出CSV 
    | 显示表格

    三维响应面图曲线越陡,显示得率受该因素影响越大;反之,曲线越缓,表明得率受该因素影响越小。等高线图椭圆表示该两两因素对实验结果影响较重,若较圆的话则影响较小。由图5可见浸泡时间和提取时间的等高线图呈椭圆形,三维响应面图曲线较陡,表明二者的交互作用对得率的影响明显。提取时间与料液比交互作用对挥发油得率的影响次之,料液比和浸泡时间交互作用对挥发油得率的影响最小。

    图  5  各两因素交互影响挥发油得率的响应面图和等高线图
    Figure  5.  Response surface diagram and contour diagram of the interaction of two factors affecting volatile oil yield

    通过Design-Expert 8.0.6对回归方程求解,结合实际生产需要确定大果木姜子挥发油的最佳提取条件为浸泡时间5 h,料液比1:5 g/mL,提取时间8 h,此条件下得率的理论值为10.15%。按照上述响应面软件分析的大果木姜子挥发油的最佳提取工艺平行提取5次,其得率分别为10.64%、10.80%,10.54%、11.08%、10.29%,平均得率为10.67%,与预测值10.15%差距较小,RSD为0.29%,表明该实验提取工艺稳定可靠。

    对总离子流图中的各峰经质谱计算机数据系统检索及核对Nist 17和Wiley 275标准质谱图,确定各化学成分,用峰面积归一化法测定各化学成分的相对质量分数。大果木姜子挥发油中共分离得到81个化合物,最终鉴定出74个化合物,主要包括烃类(27种)、醇类(19种)、酮类(10种)、酯类(4种)、醛类(3种)、萜类(3种)、酸类(2种)、酚类(2种)、其它(4种),占总挥发油的93.175%。总离子流图见图6,分析结果见表4

    图  6  大果木姜子挥发油GC-MS总离子流图
    注:图中1~9分别为α-蒎烯、β-蒎烯、对伞花烃、1,8桉叶素、隐酮、α-萜品烯醇、枯茗醛、月桂酸、(-)斯巴醇。
    Figure  6.  GC-MS total ion chromatogram of Litsea lancilimba Merr. volatile oil
    表  4  大果木姜子挥发油化学成分及含量
    Table  4.  Chemical constituents and contents of Litsea lancilimba Merr. volatile oil
    分类序号保留时间(min)化合物分子式相对含量(%)
    烃类19.813三环烯C10H160.021
    29.879α-侧柏烯C10H160.486
    310.185α-蒎烯C10H164.452
    410.629葑烯C10H160.020
    510.707莰烯C10H161.122
    610.862侧柏-2,4(10)-二烯C10H140.069
    711.507香桧烯C10H161.576
    811.724β-蒎烯C10H164.873
    911.981β-月桂烯C10H160.262
    1012.497蒈烯C10H160.019
    1112.642α-水芹烯C10H160.257
    1212.884δ-3-蒈烯C10H160.061
    1313.116δ-3-蒈烯C10H160.184
    1413.306邻伞花烃C10H140.047
    1513.468对伞花烃C10H144.579
    1613.703柠檬烯C10H161.883
    1714.800γ-松油烯C10H160.336
    1816.060α-异松油烯C10H160.360
    1927.693α-荜澄茄油烯C15H240.035
    2028.911α-胡椒烯C15H240.290
    2130.844α-葎草烯C15H240.124
    2232.266丁子香烯C15H240.124
    2332.573别香树烯C15H240.040
    2433.633芹子烯C15H240.553
    2534.975δ-杜松烯C15H240.219
    2635.834α-白菖烯C15H200.577
    2737.588氧化丁香烯C15H24O1.160
    醇类116.442芳樟醇C10H18O0.267
    217.559反式-薄荷-2-烯-1-醇C10H18O0.242
    318.430松香芹醇C10H16O1.215
    418.616马鞭草烯醇C10H16O0.779
    519.604内-莰醇C10H18O1.284
    620.0884-松油醇C10H18O0.891
    720.450对伞花-8-醇C10H14O0.396
    820.74α-萜品烯醇C10H18O3.188
    920.986桃金娘烯醇C10H16O1.079
    1022.192枯烯醇C9H12O0.378
    1123.325香叶醇C10H18O0.067
    1225.100对伞花-7-醇C10H14O1.135
    1336.07榄香醇C15H26O0.863
    1437.388(-)斯巴醇C15H24O2.660
    1538.035愈创木醇C15H26O1.011
    1639.362γ-桉叶油醇C15H26O0.132
    1739.602异桉叶油醇C15H24O0.137
    1840.139α-桉叶油醇C15H26O0.581
    1940.692异愈创木醇C15H26O0.465
    酮类117.353侧柏酮C10H16O0.019
    218.794(-)-莰酮C10H16O0.036
    319.203桧酮C9H14O0.245
    419.450松香芹酮C10H14O0.463
    520.581隐酮C9H14O2.803
    621.570苯贝酮C10H14O0.350
    723.042香匠酮C10H14O0.226
    823.545胡椒酮C10H16O0.047
    926.0266-羟基卡沃坦丙酮C10H16O20.033
    1026.736左旋香芹酮C10H16O0.226
    酯类124.874乙酸龙脑酯C12H20O20.697
    226.305癸酸甲酯C11H22O20.091
    334.695十二烷酸甲酯C13H26O20.053
    449.78反戊基癸酸酯C20H34O20.080
    酚类121.886反式香芹酚C10H16O0.285
    225.504香芹酚C10H14O0.814
    萜类130.697α-檀香萜C15H240.079
    212.1142,3-脱氢-1,8-桉叶素C10H16O0.196
    313.8771,8-桉叶素C10H18O21.854
    醛类122.904枯茗醛C10H12O1.254
    224.50水芹醛C10H16O0.785
    317.741α-龙脑烯醛C10H16O0.183
    酸类129.896正癸酸C10H20O212.893
    237.031月桂酸C12H24O23.734
    其它134.280二氢沉香呋喃C15H26O0.214
    235.331阔叶缬草醚C15H26O0.134
    315.193反式-香桧烯水合物C10H18O0.588
    438.591(-)-蛇麻烯环氧化物IIC15H24O0.872
    总计93.175
    下载: 导出CSV 
    | 显示表格

    由大果木姜子挥发油各成分相对含量可知以烃类(23.729%)、萜类(22.129%)、醇类(16.77%)、酸类(16.627%)成分为主。其中1,8-桉叶素的含量达到了21.854%,其它相对含量高于3%的分别为正癸酸(12.893%)、β-蒎烯(4.873%)、对伞花烃(4.579%)、α-蒎烯(4.452%)、月桂酸(3.734%)、α-萜品烯醇(3.188%)。文献报道1,8-桉叶素、月桂酸、α-蒎烯均具有抑菌作用[26-28],其中月桂酸及其酯类是食品和化妆品中最有效的抗菌剂。α-萜品烯醇则具有平喘抗炎的效果[29]。本研究采用水蒸气蒸馏法提取得到的大果木姜子挥发油中1,8-桉叶素、月桂酸、α-蒎烯含量明显高于其它文献所报道(其它文献报道1,8-桉叶素最高含量为9.87%,月桂酸最高含量为3.184%,α-蒎烯最高含量为1.012%)[19,30-31],上述分析表明该产地大果木姜子挥发油可能具有较好的抑菌平喘效果。

    不同浓度的大果木姜子挥发油对DPPH自由基的清除率见图7。结果表明大果木姜子挥发油抗氧化活性随质量浓度的增加而逐渐升高,在质量浓度达到6.0 mg/mL后对DPPH自由基清除率的增幅变缓,当质量浓度为10.0 mg/mL时,样品清除率为95.80%,此时的抗氧化能力接近于质量浓度为6 μg/mL的VC。采用Prism 8.0.1计算得其IC50值为0.2434 mg/mL,结果表明大果木姜子挥发油对DPPH自由基具有较好的清除能力,说明其具有一定的体外抗氧化活性。有文献报道,1,8-桉叶素、α-蒎烯等均具有较高的抗氧化活性[32-33],推测这些成分可能与大果木姜子挥发油的抗氧化活性有一定的关系。

    图  7  大果木姜子挥发油及维生素C对DPPH·的清除作用(n=3)
    Figure  7.  DPPH·scavenging test results of Vc and Litsea lancilimba Merr. volatile oil (n=3)

    本实验采用响应面法确定了大果木姜子挥发油最优提取工艺为浸泡时间5 h,料液比1:5 g/mL,提取时间8 h,得率可达10.67%,与理论值比较无显著性差异,表明该提取工艺稳定可行,提高了大果木姜子挥发油的得率。对该产地的大果木姜子挥发油化学组成及相对含量进行了分析,共鉴定了74种成分,占总挥发油量的93.175%,主要为烃类(23.729%)、萜类(22.129%)、醇类(16.77%)、酸类(16.627%),为后续大果木姜子挥发油生物活性研究提供了依据。抗氧化作用研究表明大果木姜子挥发油对DPPH自由基的具有较好的清除作用,具有一定的抗氧化活性。后续将继续对大果木姜子挥发油进行更为全面的抗氧化作用研究,同时进行量效相关性分析,以期得到具有较强抗氧化作用的天然活性成分。

  • 图  1   浸泡时间对大果木姜子挥发油得率的影响

    注:不同小写字母表示差异显著(P<0.05),图2~图4同。

    Figure  1.   Effect of soak time on the yield of Litsea lancilimba Merr. volatile oil

    图  2   提取功率对大果木姜子挥发油得率的影响

    Figure  2.   Effect of extraction power on the yield of Litsea lancilimba Merr. volatile oil

    图  3   料液比对大果木姜子挥发油得率的影响

    Figure  3.   Effect of material-liquid ratio on the yield of Litsea lancilimba Merr. volatile oil

    图  4   提取时间对大果木姜子挥发油得率的影响

    Figure  4.   Effect of extraction time on the yield of Litsea lancilimba Merr. volatile oil

    图  5   各两因素交互影响挥发油得率的响应面图和等高线图

    Figure  5.   Response surface diagram and contour diagram of the interaction of two factors affecting volatile oil yield

    图  6   大果木姜子挥发油GC-MS总离子流图

    注:图中1~9分别为α-蒎烯、β-蒎烯、对伞花烃、1,8桉叶素、隐酮、α-萜品烯醇、枯茗醛、月桂酸、(-)斯巴醇。

    Figure  6.   GC-MS total ion chromatogram of Litsea lancilimba Merr. volatile oil

    图  7   大果木姜子挥发油及维生素C对DPPH·的清除作用(n=3)

    Figure  7.   DPPH·scavenging test results of Vc and Litsea lancilimba Merr. volatile oil (n=3)

    表  1   大果木姜子挥发油响应面因素水平表

    Table  1   Response surface factor level table of the volatile oil of Litsea lancilimba Merr.

    因素水平
    −101
    A浸泡时间(h)02.55
    B料液比(g/mL)1:21:41:6
    C提取时间(h)6810
    下载: 导出CSV

    表  2   大果木姜子挥发油响应面试验设计与结果

    Table  2   Response surface experiment design and results of Litsea lancilimba Merr. volatile oil

    实验号A浸泡时间B料液比C提取时间得率(%)
    11−108.37
    200010.47
    31019.37
    41109.74
    500010.43
    600010.19
    700010.08
    8−1109.14
    90−118.72
    10−1019.44
    11−1−108.40
    1210−19.87
    1300010.17
    14−10−17.96
    1501−18.46
    160−1−18.40
    170119.72
    下载: 导出CSV

    表  3   大果木姜子挥发油响应面方差分析

    Table  3   Response surface variance analysis of volatile oil of Litsea lancilimba Merr.

    方差来源平方和自由度均方差FP显著性
    模型10.3191.1516.030.0007**
    A0.7210.7210.080.0156*
    B1.2411.2417.410.0042**
    C0.8210.8211.460.0117*
    AB0.110.11.40.275
    AC0.9710.9713.620.0077**
    BC0.2210.223.030.1253
    A21.111.115.450.0057**
    B23.0113.0142.150.0003**
    C21.511.521.020.0025**
    残差0.570.071
    失拟差0.3830.134.320.0956
    纯误差0.1240.029
    总离差10.8116
    注:*表示P<0.05,结果具有显著性,**表示P<0.01,结果具有极显著性。
    下载: 导出CSV

    表  4   大果木姜子挥发油化学成分及含量

    Table  4   Chemical constituents and contents of Litsea lancilimba Merr. volatile oil

    分类序号保留时间(min)化合物分子式相对含量(%)
    烃类19.813三环烯C10H160.021
    29.879α-侧柏烯C10H160.486
    310.185α-蒎烯C10H164.452
    410.629葑烯C10H160.020
    510.707莰烯C10H161.122
    610.862侧柏-2,4(10)-二烯C10H140.069
    711.507香桧烯C10H161.576
    811.724β-蒎烯C10H164.873
    911.981β-月桂烯C10H160.262
    1012.497蒈烯C10H160.019
    1112.642α-水芹烯C10H160.257
    1212.884δ-3-蒈烯C10H160.061
    1313.116δ-3-蒈烯C10H160.184
    1413.306邻伞花烃C10H140.047
    1513.468对伞花烃C10H144.579
    1613.703柠檬烯C10H161.883
    1714.800γ-松油烯C10H160.336
    1816.060α-异松油烯C10H160.360
    1927.693α-荜澄茄油烯C15H240.035
    2028.911α-胡椒烯C15H240.290
    2130.844α-葎草烯C15H240.124
    2232.266丁子香烯C15H240.124
    2332.573别香树烯C15H240.040
    2433.633芹子烯C15H240.553
    2534.975δ-杜松烯C15H240.219
    2635.834α-白菖烯C15H200.577
    2737.588氧化丁香烯C15H24O1.160
    醇类116.442芳樟醇C10H18O0.267
    217.559反式-薄荷-2-烯-1-醇C10H18O0.242
    318.430松香芹醇C10H16O1.215
    418.616马鞭草烯醇C10H16O0.779
    519.604内-莰醇C10H18O1.284
    620.0884-松油醇C10H18O0.891
    720.450对伞花-8-醇C10H14O0.396
    820.74α-萜品烯醇C10H18O3.188
    920.986桃金娘烯醇C10H16O1.079
    1022.192枯烯醇C9H12O0.378
    1123.325香叶醇C10H18O0.067
    1225.100对伞花-7-醇C10H14O1.135
    1336.07榄香醇C15H26O0.863
    1437.388(-)斯巴醇C15H24O2.660
    1538.035愈创木醇C15H26O1.011
    1639.362γ-桉叶油醇C15H26O0.132
    1739.602异桉叶油醇C15H24O0.137
    1840.139α-桉叶油醇C15H26O0.581
    1940.692异愈创木醇C15H26O0.465
    酮类117.353侧柏酮C10H16O0.019
    218.794(-)-莰酮C10H16O0.036
    319.203桧酮C9H14O0.245
    419.450松香芹酮C10H14O0.463
    520.581隐酮C9H14O2.803
    621.570苯贝酮C10H14O0.350
    723.042香匠酮C10H14O0.226
    823.545胡椒酮C10H16O0.047
    926.0266-羟基卡沃坦丙酮C10H16O20.033
    1026.736左旋香芹酮C10H16O0.226
    酯类124.874乙酸龙脑酯C12H20O20.697
    226.305癸酸甲酯C11H22O20.091
    334.695十二烷酸甲酯C13H26O20.053
    449.78反戊基癸酸酯C20H34O20.080
    酚类121.886反式香芹酚C10H16O0.285
    225.504香芹酚C10H14O0.814
    萜类130.697α-檀香萜C15H240.079
    212.1142,3-脱氢-1,8-桉叶素C10H16O0.196
    313.8771,8-桉叶素C10H18O21.854
    醛类122.904枯茗醛C10H12O1.254
    224.50水芹醛C10H16O0.785
    317.741α-龙脑烯醛C10H16O0.183
    酸类129.896正癸酸C10H20O212.893
    237.031月桂酸C12H24O23.734
    其它134.280二氢沉香呋喃C15H26O0.214
    235.331阔叶缬草醚C15H26O0.134
    315.193反式-香桧烯水合物C10H18O0.588
    438.591(-)-蛇麻烯环氧化物IIC15H24O0.872
    总计93.175
    下载: 导出CSV
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  • 收稿日期:  2021-12-01
  • 网络出版日期:  2022-08-01
  • 刊出日期:  2022-09-30

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