桑葉機能成分之探討

Study on the functional components of four mulberry varieties (Morus alba L.)

廖久薰(Chiu-Hsun Liao) ； 賴瑞聲(Jui-Sheng Lai)

《苗栗區農業改良場研究彙報》 8期 (2019/12) Pp. 47-60

摘要

本研究為探討桑葉作為機能性產品的可行性，以臺灣地區推廣之台桑2號、台桑3號與2個品系78H-008及80C-040為材料，比較葉桑不同葉位及枝條熱水萃取物之總酚、總黃酮含量以及DPPH清除能力，結果顯示上位葉與中下位葉之總酚含量是11.4～22.4及總黃酮含量為6.8～14.4 mg/g，枝條含4.4～5.9 mg/g總酚及1.3～2.0 mg/g類黃酮成分，桑葉的機能性成分高於枝條（P ＜ 0.01），DPPH清除能力與總酚及類黃酮含量成正相關（r = 0.8774**及0.8029**），具有開發機能性產品的潛力。進一步探討不同收穫季節對四個桑樹品系（種）機能性成分的影響：四個桑樹品系（種）其機能性成分在季節間呈現不同的變化，台桑2號、台桑3號及80C-040品系以冬季顯著優於其它季節（P ＜ 0.01）；78H-008品系在夏及秋季收穫具有較高的機能性成分，可製作品質較佳的機能性產品。

關鍵字

桑葉 ； 機能性 ； 季節 ； 總酚 ； 類黃酮

並列摘要

Four mulberry varieties which Taisang 2, Taisang 3, 78H-008 and 80C-040, were extracted with hot water to explore the feasibility of using mulberry leaf as raw materials for mulberry tea. The total phenols, total flavonoids and DPPH scavenging ability of mulberry leaves extracts from different harvest parts were compared. The results showed that the total phenols and total flavonoids in the upper and middle leaves were 11.4-22.4 and 6.8-14.4 mg/g, respectively. The shoots were 4.4-5.9 mg/g and 1.3-2.0 mg/g. The functional components of mulberry leaves were higher than that of shoots (P ＜ 0.01), and DPPH scavenging ability was positively correlated with total phenols and flavonoids (r = 0.8774** and 0.8029**), with the potential as a raw material for functional tea. The effects of different harvesting seasons on the functional components of four mulberry varieties were further explored. The functional components of the four mulberry varieties showed different seasonal changes. Taisang 2, Taisang 3 and 80C-040 varieties were significantly better than other seasons in winter (P ＜ 0.01); In summer and autumn, the 78H-008 specie had higher total phenols and flavonoids.

並列關鍵字

mulberry leaf ； functional components ； seasons ； total phenols ； flavonoids