Phenolic Contents and Antioxidant Properties of Stenochlaena Palustris, an Edible Medicinal Fern

Stenochlaena palustris，一種可食用之葯用蕨類的酚類含量及抗氧化物特性

Tsun-Thai Chai ； Esvini Panirchellvum ； Hean-Chooi Ong ； Fai-Chu Wong

《Botanical Studies》 53卷4期 (2012/10) Pp. 439-446

摘要

Stenochlaena palustris是一種可當蔬菜和用於傳統醫學之一種食用蕨類。本研究分析了總多酚，類黃酮素，氫氧肉桂酸及花青素含量；還有S. palustris抽出物之消除根基、還原鐵離子以及螯合金屬離子的能力。所使用之四種抽取物乃從蕨類之幼不育葉、成熟不育葉、幼孢子囊莖、及成熟孢子囊莖四部份各自抽取所得。成熟不育葉之抽取物含最高量之總多酚（51.69mg/g乾物），類黃酮素（58.05 mg/g乾物），及氫氣肉桂酸（48.80mg/g乾物），幼不育葉之抽取物含多出20倍之花青素，相比於其他三種抽取物。總合言之，總多酚量密切地且正面地和根基清除能力相關（R^2=0.968），還原鐵離子的能力相關（R^2=0.960）；但是僅中等地和金屬離子之螯合能力正相關（R^2=0.446），因可食用之幼不育葉含高量之花青素及高比金屬離子螯合能力突顯出本文所介紹之蕨類作為功能性食物之潛在價值。另一方面，因成熟不育葉具高多酚量，強力之還原力，以及整件可供給的優點；代表了有潛力之天然抗氧化物之來源。

關鍵字

抗氧化物 ； 金屬離子螯合 ； 多酚類

並列摘要

Stenochlaena palustris is an edible fern that is used as vegetable and in traditional medicine. This study assessed the total polyphenol, flavonoid, hydroxycinnamic acid and anthocyanin contents, as well as radical scavenging, ferric reducing and metal chelating activities of the extracts of S. palustris. The four extracts analysed were prepared from the young sterile, mature sterile, young fertile, and mature fertile fronds of the fern. The extract of mature sterile frond had the highest contents of total polyphenols (51.69mg/g dry matter), flavonoids (58.05mg/g dry matter), and hydroxycinnamic acids (48.80mg/g dry matter). The extract of the edible young sterile frond contained 20-fold more anthocyanins (51.32mg/100 g dry matter) compared with the other extracts. Overall, total polyphenol contents correlated strongly and positively with radical scavenging activity (R^2=0.968) and ferric reducing activity (R^2=0.960), but only moderately with metal chelating activity (R^2=0.446). Anthocyanin content and high specific metal chelating activity of the edible young sterile frond highlight the potential of the fern as a functional food. On the other hand, the mature sterile frond, with its high phenolic contents, potent effectiveness as reductants and year-round availability, represents a potential source of natural antioxidants.

並列關鍵字

Antioxidant ； DPPH ； FRAP ； Metal chelating ； Phenolic compound ； Stenochlaena palustris