安溪若干鄉(xiāng)鎮(zhèn)鐵觀音揮發(fā)性成分及其指紋圖譜
發(fā)布時間:2018-07-14 13:57
【摘要】:鐵觀音屬半發(fā)酵茶,主要產(chǎn)于福建安溪,具有獨特的風(fēng)味和保健作用。本文以鐵觀音為研究對象,采用頂空固相微萃取法(HS-SPME)聯(lián)合氣相色譜質(zhì)譜聯(lián)用儀(GC-MS)考察了不同涂層的萃取頭、萃取時間、萃取溫度對萃取效果的影響,再對不同加工工藝、不同季節(jié)、不同產(chǎn)地的鐵觀音揮發(fā)性成分進行定性和定量的檢測分析。并懫用計算指紋圖譜的相似度、峰的重疊率,提取共有峰,聚類分析等數(shù)據(jù)處理手段對鐵觀音茶的指紋圖譜進行可視化處理。實驗結(jié)果如下:(1)對安溪鐵觀音揮發(fā)性成分的萃取最適宜的SPME萃取頭型號是50/30μm DVB/CAR/PDMS,最佳的萃取時間是60min,最佳的萃取溫度是70℃。(2)在正味、消青和拖酸型的安溪鐵觀音茶中分別鑒定出52、53和68種揮發(fā)性成分,總共77種揮發(fā)性化合物。三者的共有成分有41種,主要包括橙花叔醇、α-金合歡烯、吲哚、2,2-二甲基丙酸-2-苯基乙酯等,鐵觀音茶的加工工藝不同,所得成分和含量也不同,但仍保有鐵觀音揮發(fā)性成分特征。(3)在春秋兩個季節(jié)的鐵觀音茶中分別鑒定出44、50種揮發(fā)性成分,總共63種揮發(fā)性化合物,共有成分有31種。不同季節(jié)的鐵觀音揮發(fā)性成分有明顯的季節(jié)特征,且其共有成分能作為鐵觀音季節(jié)判別的重要指標之一。(4)對不同產(chǎn)地鐵觀音的指紋圖譜進行相似度、峰重疊率的計算,共有峰的提取和聚類分析,結(jié)果表明,鐵觀音茶樣的來源比較接近,其相似度較高,聚類結(jié)果與產(chǎn)地形成對應(yīng)關(guān)系,提取出的15個共有峰為鐵觀音揮發(fā)性物質(zhì)的基本組成成分,可作為鑒別鐵觀音來源的必要條件之一。
[Abstract]:Tieguanyin is a semi-fermented tea, mainly produced in Anxi, Fujian Province, with unique flavor and health care. In this paper, Headspace solid phase microextraction (HS-SPME) combined with gas chromatography-mass spectrometry (GC-MS) was used to investigate the effects of different coatings on the extraction efficiency. The volatile components of Tieguanyin in different seasons and different producing areas were analyzed qualitatively and quantitatively. The fingerprint of Tieguanyin tea was visualized by calculating the similarity of fingerprint spectrum, overlapping rate of peaks, extracting common peaks and clustering analysis. The experimental results are as follows: (1) the most suitable extraction head for volatile components of Anxi Tieguanyin Tea is 50 / 30 渭 m DVB / car / PDMS, the best extraction time is 60 min, and the optimum extraction temperature is 70 鈩,
本文編號:2121864
[Abstract]:Tieguanyin is a semi-fermented tea, mainly produced in Anxi, Fujian Province, with unique flavor and health care. In this paper, Headspace solid phase microextraction (HS-SPME) combined with gas chromatography-mass spectrometry (GC-MS) was used to investigate the effects of different coatings on the extraction efficiency. The volatile components of Tieguanyin in different seasons and different producing areas were analyzed qualitatively and quantitatively. The fingerprint of Tieguanyin tea was visualized by calculating the similarity of fingerprint spectrum, overlapping rate of peaks, extracting common peaks and clustering analysis. The experimental results are as follows: (1) the most suitable extraction head for volatile components of Anxi Tieguanyin Tea is 50 / 30 渭 m DVB / car / PDMS, the best extraction time is 60 min, and the optimum extraction temperature is 70 鈩,
本文編號:2121864
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