The relative concentrations of major volatile compounds against internal standard are presented (Table 6). (E)-geraniol, linalool, hexanal, pentanal, heptanal, nonanal and jasmone were prevailing volatile compounds detected in all the samples. These compounds together with some other terpene alcohols (e.g. methyl salicylate and benzyl alcohol) are possibly the principal contributor to floral green odour of made Longjing teas as (E)-geraniol and linalool oxides present pleasant floral odour (Kumazawa & Masuda, 2002). Their abundant concentrations in Longjing teas can be formed during spreading of fresh young shoots before processing, in which hydrolysis of their glycosides and primeverosides by b-glucosidase primeverosidase occurs intensively (Yano et al., 1990; Guo et al., 1995). Perceived aroma score positively correlated with concentration of nonanal and heptanal (P < 0.05), but negatively with those of linalool oxide I, 1-heptanol, linalool oxide II, (E)-geraniol and jasmone (P < 0.05). TQS negatively correlated with the concentration of linalool oxide I (P < 0.05; Table 7). The concentration of (E)-geraniol could be either higher or lower in better quality green teas (Kato & Shibamoto, 2001). Somethermal generated compounds, e.g. 3.7-dimethyl-1,5,7octatrien-3-ol was measured in most of Longjing tea samples and 2,5-dimethyl pyrazine was detected in some samples. These later compounds exhibiting toasted flavour are known as heat products from amino acid sand sugars (Kawakami & Yamanishi, 1983; Kato & Shibamoto, 2001).
針對內標主要揮發性化合物的相對濃度被呈現(表6)。(E)-geraniol,芳樟醇,己醛,戊醛,庚醛,壬醛和茉莉酮中盛行的揮發性化合物在所有樣品中檢測到。這些化合物與其它一些萜烯醇在一起(例如水楊酸甲酯和芐醇)是可能至FL由龍井茶的口服綠色氣味作為(E)的主要貢獻者-geraniol和芳樟醇氧化物本愉快FL口腔異味(熊澤尚&增田,2002)。其豐富的濃度在龍井茶可以處理之前的新鮮嫩梢擴頻,其中用b葡糖苷primeverosidase它們的糖苷和primeverosides水解集中發生過程中形成(Yano等人,1990; Guo等人,1995)。感知香氣得分的壬醛和庚醛(P <0.05)濃度呈正相關,但負那些芳樟醇氧化物I,1-庚醇,芳樟醇氧化物II,(E)和-geraniol茉莉酮(P <0.05)的。(表7 P <0.05)與TQS芳樟醇氧化物的濃度予負相關。的濃度(E)-geraniol可以高於或質量更好的綠茶(加藤和芝本,2001年)降低。Somethermal生成化合物,例如3.7二甲基1,5,7octatrien -3-醇在大多數龍井樣品和2,5-二甲基吡嗪的一些樣品中檢測測定。這些後來的化合物參展烤FL avour被稱為熱產品從氨基酸砂糖(川上&Yamanishi,1983;加藤&柴本,2001)。1-庚醇,芳樟醇氧化物II,(E)和-geraniol茉莉酮(P <0.05)。(表7 P <0.05)與TQS芳樟醇氧化物的濃度予負相關。的濃度(E)-geraniol可以高於或質量更好的綠茶(加藤和芝本,2001年)降低。Somethermal生成化合物,例如3.7二甲基1,5,7octatrien -3-醇在大多數龍井樣品和2,5-二甲基吡嗪的一些樣品中檢測測定。這些後來的化合物參展烤FL avour被稱為熱產品從氨基酸砂糖(川上&Yamanishi,1983;加藤&柴本,2001)。1-庚醇,芳樟醇氧化物II,(E)和-geraniol茉莉酮(P <0.05)。(表7 P <0.05)與TQS芳樟醇氧化物的濃度予負相關。的濃度(E)-geraniol可以高於或質量更好的綠茶(加藤和芝本,2001年)降低。Somethermal生成化合物,例如3.7二甲基1,5,7octatrien -3-醇在大多數龍井樣品和2,5-二甲基吡嗪的一些樣品中檢測測定。這些後來的化合物參展烤FL avour被稱為熱產品從氨基酸砂糖(川上&Yamanishi,1983;加藤&柴本,2001)。的濃度(E)-geraniol可以高於或質量更好的綠茶(加藤和芝本,2001年)降低。Somethermal生成化合物,例如3.7二甲基1,5,7octatrien -3-醇在大多數龍井樣品和2,5-二甲基吡嗪的一些樣品中檢測測定。這些後來的化合物參展烤FL avour被稱為熱產品從氨基酸砂糖(川上&Yamanishi,1983;加藤&柴本,2001)。的濃度(E)-geraniol可以高於或質量更好的綠茶(加藤和芝本,2001年)降低。Somethermal生成化合物,例如3.7二甲基1,5,7octatrien -3-醇在大多數龍井樣品和2,5-二甲基吡嗪的一些樣品中檢測測定。這些後來的化合物參展烤FL avour被稱為熱產品從氨基酸砂糖(川上&Yamanishi,1983;加藤&柴本,2001)。
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