頁籤選單縮合
題名 | 酵素處理對烏龍茶湯品質的影響=Effect of Enzymatic Treatment on the Quality of Oolong Tea Infusion |
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作 者 | 高碧穗; 陳清泉; 施玲玲; 程竹青; | 書刊名 | 食品科學 |
卷期 | 23:3 1996.06[民85.06] |
頁次 | 頁356-366 |
分類號 | 463.84 |
關鍵詞 | 烏龍茶; 酵素處理; 感官評估; 混濁度; Oolong tea; Enzyme digestion; Sensory evaluation; Turbidity; |
語文 | 中文(Chinese) |
中文摘要 | 烏龍茶葉以85℃熱水浸泡10min後(茶葉╱萃取水比例1:9),分別進行離心、冰沿及酵素處理,結果發現各種處理方式對茶湯的澄清度皆有改善效果,其中又以纖維酵素及果膠酵素的處理效果最好。在感官評估方面,離心處理後的茶湯其顏色較未離心處理者佳,但香氣較淡,而滋味及總體接受性兩者則無差異。茶湯以離心、冰浴及酵素等不同處理後其茶湯各方面的感官得分亦無顯著差異。利用二階次中心旋轉組合設計,探討果膠酵素濃度及反應時間對茶湯品質的影響,結果顯示,酵素濃度的增加可明顯降低茶湯的混濁度,而反應時間對茶湯濁度的影響,則在較低酵素濃度時反應時間增加濁度有降低的趨勢。酵素濃度的增加亦可提高茶湯的Hunter L值及Hunter b值。而反應時間愈長茶湯的Hunter a值則有愈高的趨勢。10%烏龍茶葉萃取液經0.3~0.4%的纖維酵素作用1~2小時後,可使茶湯濁度降至最低,且具最佳的顏色。 |
英文摘要 | Oolong tea infusions obtained by percolating with 10% oolong tea leaves at 85℃ for 10 min were clarified by centrifugation, enzymic digestion, and ice-bath cooling, respectively. Results showed that these treatments were all effective in decreasing the turbidity of oolong tea infusion. Treatment with cellulose or pectinase was the most effective in lowering the turbidity value. Sensory color scores of oolong tea infusion after centrifugation were higher than untreated tea infusion, while flavor scores were lower. Other sensory attributes, such as taste and acceptance, showed no significant difference after centrifugation. All sensory attributes were not significantly different between these treatments. Effects of enzyme cellulose concentration and reaction time on the quality of oolong tea infusion were evaluated by using second order central composite rotatable design. Results showed that turbidity were lowered significantly, while Hunter L and b values of oolong tea infusions increased, when increasing cellulose concentration. The reduction of turbidity of oolong tea infusions were also found when increasing reaction time under low cellulose concentration, Hunter a value, on the other hand, increased when increasing reaction time. Optimal conditions for obtaining, the lowest turbidity and the highest color scores were treating the oolong tea infusion with cellulose at a concentration around 0.3~0.4% (w/w) for 1~2 hours. |
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