摘要:本課題主要是以石榴茶為原料，以普通紅茶為對照，考察在不同的浸泡溫度70℃、80℃、90℃、100℃，不同浸泡時間5min、15min、25min、35min、45min、55min以及不同浸泡料液比1:25、1:50、1:75、1:100，以石榴茶的透光率、茶多酚含量以及清除羥基自由基的能力為指標，以其品質的變化確定最佳浸泡條件。并在最佳浸泡條件下測得石榴茶中游離氨基酸、類黃酮、可溶性糖、Vc、葉綠素的含量以及其還原力、TBA抑制率、超氧陰離子的清除率。結果表明：浸泡時間為15min，浸泡溫度80℃，料液比為1:50時為最佳浸泡條件。在此條件下，石榴茶的透光率為71.6%，羥基自由基清除率為47.1%，茶多酚含量為0.707mg/g，游離氨基酸含量為0.597μg/mL，可溶性糖含量為106.82μg/mL，類黃酮的含量為0.197μg/mL，Vc含量為18.00μg/mL，葉綠素的總濃度為39.83mg/L，抗氧化性物質TBA抑制率為10.6%，超氧陰離子清除率為54.47%。在最佳浸泡條件下游離氨基酸含量比對照（普通紅茶）增加了0.042μg/mL，可溶性糖含量增加了0.34μg/mL，類黃酮的含量增加了0.12μg/mL，Vc含量增加了5.5μg/mL，葉綠素的總濃度增加了13.3mg/L，抗氧化性物質TBA抑制率提高了2.84%，超氧陰離子清除率提高了16.62%。

關鍵詞: 石榴茶；浸泡條件；營養成分；抗氧化性

Abstract:The main subject is based on the pomegranate tea as raw materials, choosing the ordinary black tea as the contrast, according to the changes in the quality of the pomegranate tea, the light transmittance of the pomegranate tea ,the content of tea polyphenols as well as the ability to clear the hydroxyl radical as the indicators to determine its best soaking conditions under different soaking temperature of 70℃, 80℃, 90℃, 100℃, different soaking time of 5min, 15min, 25min, 35min, 45min, 55min and different ratioes of solid-liquid 1:25, 1:50, 1:75, 1:100. Optimal soaking conditions measured pomegranate tea free amino acids, flavonoids, soluble sugar, Vc, chlorophyll content, and reducing power, TBA suppression rate, clearance rate of superoxide anion. The results show that: the soaking time of 15min, a soak temperature 80℃, solid-liquid ratio of 1:50 is the best soaking conditions. In this condition, the the pomegranate tea light transmission rate of 71.6%, hydroxyl radical scavenging rate was 47.1%, polyphenol content of 0.707mg/g, free amino acids 0.597μg/mL soluble sugar content 106.82μg/mL; flavonoids was 0.197μg/mL; Vc content 18.00μg/mL; the total concentration of chlorophyll was 39.83mg/L; the antioxidative substances TBA inhibition rate was 10.6%; superoxide anion scavenging rate was 54.47%. Free amino acids in the optimal soaking conditions than in the control(black tea) 0.042μg/mL soluble sugar content 0.34μg/mL, flavonoids increased 0.12μg/mL, Vc content increased 5.5 ug/mL, the total concentration of chlorophyll increased 13.3mg/ L, the antioxidation substance TBA inhibition rate increase of 2.84%, 16.62% increase in superoxide anion scavenging rate.

Keywords  Pomegranate tea  Soaking conditions  Nutrient Composition  Anti-oxidation