Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/36900
標題: 不同茶樹品種(系)與採製方式對茶葉兒茶素、咖啡因含量與抗氧化能力之影響
Variety and Brewing Techniques Influence Catechins, Caffeine and Antioxidant Capacity of Tea.
作者: 鄭貽文
Jheng, Yi-Wun
關鍵字: Tea

Variety
Brewing Techniques
品種
採製方式
出版社: 農藝學系所
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摘要: 茶是全世界最受歡迎的嗜好料作物之一,茶葉所含的化合物含量受各種不同因素影響,包括茶樹品種、生長採製季節、葉齡、栽培管理方式、生育氣候以及加工發酵過程等。本試驗以不同茶樹品種(系)茶葉為原料,比較不同採製方式對總多元酚類、兒茶素、咖啡因含量及抗氧化能力之差異,以作為品種選育及日後製茶流程控制參考之依據,結果摘述如下: 1、比較不同紫色芽茶樹品系製成紅茶與包種茶總兒茶素與咖啡因含量之差異,結果發現不同品系所含兒茶素與咖啡因含量有顯著差異。包種茶中所含總兒茶素含量較紅茶高,咖啡因含量則反之。進一步比較不同成茶抗氧化能力之差異,包種茶總酚類含量較紅茶高,但抗氧化能力則以紅茶較包種茶高。 2、分別於92年5月13日及7月27日採製三個不同茶樹品系(B-56-70-66-1、B-56-70-211-1、B-69-80-21)與適製紅茶之台茶十八號茶菁皆調製成紅茶,製程中揉捻與發酵時間,分別達150分鐘與180分鐘處理。分析不同品種(系)採製紅茶中兒茶素與咖啡因含量的變化,及測定其抗氧化能力之差異。兒茶素、咖啡因含量與抗氧化能力在不同品種(系)茶樹間均呈現顯著差異,不同採製期亦顯著影響紅茶中兒茶素、咖啡因含量與抗氧化能力,但揉捻與發酵並未顯著影響兒茶素、咖啡因含量與抗氧化能力。 3、以青心烏龍及台茶十二號兩茶樹品種製成包種茶,並比較製茶期間四次不同攪拌處理兒茶素與咖啡因含量的變化及其對抗氧化能力的影響。結果得知,青心烏龍在四次攪拌的過程中兒茶素與咖啡因含量與抗氧化能力皆較台茶十二號高,不同攪拌次數與靜置時間會影響兒茶素含量之升降,但對於咖啡因含量的影響並不顯著。
Tea plants are widely cultivated and its product is one of the most popular beverages in the world because of its attractive aroma, taste, and healthy effects. The composition of tea varies with species, season, age of the leaf, climate, agronomic practice, and manufacture process. In the present study, a gradient HPLC procedure was developed for simultaneous determination for the composition of catechins and caffeine in various tea samples extracted by water. In addition, levels of total phenol, and antioxidant capacity in the samples of black and Pouchong tea made from different varieties, pluking, seasons, and fermentation processes were also investigated. Total phenolics from water extract were determined by the Folin-Ciocalteu procedure and antioxidant activity was evaluated by ferryl myoglobin/ABTS assays, using Trolox as standards. To compare catechins, caffeine, total phenols, and antioxidant activity among 39 purple shoot tea lines harvested by different seasons and manufactured by different fermentation processes, resulting data showed considerable variability in total catechins, range from 40.83 to 107.58 mg/g in Pouchong teas and 5.13 to 79.17 mg/g in black teas, caffeine, range from 17.54 to 28.36 mg/g in Pouchong teas and 15.74 to 50.57 mg/g in black teas, total phenolics, range from 61.93 to 118.43 mg/g in Pouchong teas and 66.38 to 99.16 mg/g in black teas, antioxidant activity, range from 6.11 to 6.56 mg Trolox/g in Pouchong teas and 8.58 to 9.22 mg Trolox /g in black teas. Caffeine contents and antioxidant activity of summer black teas were significantly higher than in less fermented spring Pouchong teas, whereas total catechins and phenolics of spring Pouchong teas were significantly higher than in summer black teas. Black tea extracts made from different varieties, pluking seasons, rolling, and fermentation processes have been studies for their catechins, caffeine, total phenols, and antioxidant activity. The results indicated that there are significant different in chemical composition and antioxidant activity among varieties and harvested date. Rolling and fermentation had little effects on the levels of chemical composition and antioxidant activity in black tea samples. To compare chemical composition in the same Pouchong tea but manufactured by different withering and shaking time, experimental results showed that there were no significant different in individual catechin, caffeine, total phenolics, and antioxidant activity but total catechins increased during fermentation process. Caffeine, total catechins, and total phenolics of Chinshin Oolong were significantly higher than Taicha No. 12.
URI: http://hdl.handle.net/11455/36900
其他識別: U0005-2008200815095400
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-2008200815095400
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