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高香品种绿茶茶坯窨制茉莉花茶品质差异研究

Quality of Jasmine Teas Made of Leaves Plucked from Highly Aromatic Cultivars

  • 摘要:
    目的 茉莉花茶起源于福建,具有鲜灵清幽、鲜爽甘醇的品质特点,深受国内外消费者喜爱。但福建茉莉花茶产业面临茉莉花种植规模萎缩、成本增加等问题,应用福建特色高香品种作为茶坯可能达到减花提质增效、丰富茉莉花茶产品花色的作用。
    方法 以高香茶树品种‘瑞香’‘金牡丹’与‘黄玫瑰’制成的炒青绿茶为原料,经相同茉莉花窨制工艺制成不同品种茉莉花茶。对不同品种绿茶茶坯窨制前后茶样进行感官品质综合评价,并采用顶空固相微萃取(HS-SPME)结合气相色谱-质谱联用技术(GC-MS)对香气组分差异进行分析。
    结果 感官审评结果表明,高香茶树品种制成绿茶茶坯品质较优,瑞香、黄玫瑰与金牡丹绿茶茶坯自带花果香气,滋味醇爽、水中带香。窨制后,金牡丹综合得分最高(68.00分,总分70分),香气呈现特征水蜜桃香、果香且浓郁持久;瑞香次之(67.30分),呈现甜嫩香;黄玫瑰得分64.75分,呈现弱苹果香,茶汤中香气凸显。窨制后,不同品种茶坯整体香气组成发生显著变化,香气以乙酸苄酯、吲哚、邻氨基苯甲酸甲酯、芳樟醇、苯甲酸甲酯等成分为主,乙酸苄酯、芳樟醇相对含量在不同茶类茶坯基础上增加,且增加幅度相近。黄玫瑰窨制前后吲哚相对含量由3.35 μg·g−1增加到6.52 μg·g−1,邻氨基苯甲酸甲酯相对含量由未检出增加到6.83 μg·g−1。瑞香窨制前后苯甲酸甲酯相对含量由未检出增加到6.32 μg·g−1。茉莉花茶香气(Jasmine Tea Flavor, JTF)指数和茉莉花茶香气品质评价得分(Aroma Quality Evaluation Score of Jasmine Tea Flavor, XFJTF)指数评价共同表明,金牡丹茶坯制成的茉莉花茶品质最佳。
    结论 不同高香茶树品种绿茶茶坯窨制成的茉莉花茶各具特色,普遍具有花果香显、水中带香等特点,其中金牡丹品质最优。

     

    Abstract:
    Objective To curtail the rising cost of quality jasmine flowers for producing the popular Fujian jasmine tea, possibility of using the leaves plucked from the highly aromatic tea cultivars to boost the flavor was investigated.
    Method Leaves plucked from the bushes of highly aromatic tea cultivars (HATC), including ‘Ruixiang’, ‘Huangmeigui’ and ‘Jinmudan’, were used to make jasmine teas following the conventional method. Sensory evaluation was conducted on the HATC tea samples before and after scenting with jasmine flowers. Aromatics in the samples were analyzed by headspace solid-phase microextraction combined with gas chromatography-mass spectrometry, and principal components determined.
    Result Without scenting of jasmine flowers, the HATC teas had a natural floral and fruity aroma, and the brewed tea tasted refreshing and carried a pleasant fragrance. After scenting, the Jinmudan tea received the highest score (i.e., 68 out of 70) on overall sensory quality with the characteristic rich and lasting peachy and the like fruity note. The sweet and mellow Ruixiang tea ranked closely second with a score of 67.30, while the last ranking Huangmeigui tea with a score of 64.75 was detected with a faint apple tang. The aroma was pronounced in the steeped scented HATC teas, and chemically, the composition of aromatics, such as benzyl acetate, indole, methyl anthranilate, linalool, and methyl benzoate in it were changed significantly as well. The relative contents of benzyl acetate and linalool in the teas increased in varying degrees. For instance, in the Huangmeigui tea, indoles rose from 3.35 μg·g−1 to 6.52 μg·g−1, and methyl anthranilate from nondetectable to 6.83 μg·g−1; and in the Ruixiang tea, methyl benzoate from being not detected to 6.32 μg·g−1. The high JTF and XFJTF, the quantified fragrancy indexes of jasmine teas, of the Jinmudan variety suggested a superiority over other HATC teas.
    Conclusion The jasmine teas made from the leaves of HATC cultivars, especially Jinmudan, were highly appealing with an intense floral and fruity aroma and could be steeped to be a eloquently fragrant and tasty drink.

     

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