食品科学 ›› 2020, Vol. 41 ›› Issue (4): 140-148.doi: 10.7506/spkx1002-6630-20190325-322

• 成分分析 • 上一篇    下一篇

搅拌棒吸附萃取结合气相色谱-质谱联用技术分析西湖龙井茶的挥发性成分

王梦琪,朱荫,张悦,施江,林智,吕海鹏   

  1. (1.农业部茶树生物学与资源利用重点实验室,中国农业科学院茶叶研究所,浙江 杭州 310008;2.中国农业科学院研究生院,北京 100081)
  • 出版日期:2020-02-25 发布日期:2020-03-02
  • 基金资助:
    国家自然科学基金面上项目(31470694);现代农业产业技术体系建设专项(CARS-19); 中国农业科学院创新工程项目(CAAS-ASTIP-2014-TRICAAS)

Analysis of Volatile Compounds in “XihuLongjing” Tea by Stir Bar Sorptive Extraction Combine with Gas Chromatography-Mass Spectrometry

WANG Mengqi, ZHU Yin, ZHANG Yue, SHI Jiang, LIN Zhi, Lü Haipeng   

  1. (1. Key Laboratoryof Tea Biology and Resources Utilization, Ministry of Agriculture, Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310008, China;2. Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China)
  • Online:2020-02-25 Published:2020-03-02

摘要: 采用搅拌棒吸附萃取(stir bar sorptive extraction,SBSE)结合气相色谱-质谱(gas chromatography-mass spectrometry,GC-MS)联用技术对西湖龙井茶中挥发性香气成分进行提取分析。应用单因素试验结合正交试验对SBSE方法中搅拌棒类型、萃取温度、时间、茶水比、转速、NaCl溶液质量分数等参数进行优化,确定最优萃取条件,建立一种茶叶挥发性香气成分的SBSE-GC-MS分析方法,实验整体准确度(高添加量加标回收率为115.11%,低添加量加标回收率为108.99%)和重复性(相对标准偏差8.23%,n=5)均良好。结果表明,采用PDMS搅拌棒、茶水比60∶1(mg/mL)、NaCl溶液质量分数5%、80 ℃热水冲泡、1 250 r/min磁力搅拌萃取90 min,西湖龙井茶中的挥发性香气成分能得到最大程度的萃取吸附。采用建立的SBSE-GC-MS方法对代表性西湖龙井茶进行分析,共鉴定出173 种化合物,包括烯醇类3 种、烯类11 种、烷烃类37 种、醛类15 种、烯醛类4 种、醚类2 种、醇类17 种、酯类22 种、内酯类5 种、烯酯类9 种、烯酮类5 种、酮类16 种、有机酸类3 种、含硫化合物3 种、氮杂环化合物3 种、氧杂环化合物3 种、芳香烃15 种。结果表明,采用SBSE方法,可使西湖龙井茶中的挥发性香气成分达到较好的萃取效果。

关键词: 搅拌棒吸附萃取, 西湖龙井茶, 香气分析, 气相色谱-质谱联用

Abstract: In this study, stir bar sorptive extraction (SBSE) combined with gas chromatography-mass spectrometry (GC-MS) was used to analyze the volatile compounds of “XihuLongjing” tea. SBSE parameters including stir bar type, extraction temperature, extraction time, tea-to-water ratio, agitation rate and ionic strength were optimized by one-factor-at-a-time and orthogonal array design methods in order to establish the SBSE-GC-MS method. The overall accuracy of the experiment was satisfactory (recoveries of 115.11% and 108.99% at high and low spiked concentration levels, respectively) and the relative standard deviation (RSD) for repeatability was 8.23% (n = 5). The results showed that the volatile aroma compounds could be extracted and adsorbed to the greatest extent under the following conditions: using polydimethyl siloxane (PDMS) twister as an extraction medium, tea-to-water ratio 60:1 (mg/mL), NaCl concentration 5%, hot water temperature 80 ℃, extraction time 90 min, and agitation rate 1 250 r/min. When representative “XihuLongjing” tea samples were analyzed by the SBSE-GC-MS method, a total of 173 volatile compounds were identified, including 3 enols, 11 alkenes, 37 alkanes, 15 aldehydes, 4 olefine aldehydes, 2 ethers, 17 alcohols, 22 esters, 5 lactones, 9 allyl esters, 5 ketones, 16 ketones, 3 organic acids, 3 sulphur compounds, and 3 nitrogen heterocyclic compounds, 3 oxygen heterocyclic compounds, and 15 aromatic hydrocarbons. Eventually, we concluded that the volatile aroma compounds in “XihuLongjing” tea could be extracted well by SBSE.

Key words: stir bar sorptive extraction, “XihuLongjing” tea, aroma analysis, gas chromatography-mass spectrometry

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