Pinelli Patrizia, Ieri Francesca, Vignolini Pamela, Bacci Laura, Baronti Silvia, Romani Annalisa
Department of Pharmaceutical Sciences, University of Florence, Via Ugo Schiff 6, 50019 Sesto F.no, Florence, Italy.
J Agric Food Chem. 2008 Oct 8;56(19):9127-32. doi: 10.1021/jf801552d. Epub 2008 Sep 6.
In the present study the phenolic composition of leaves, stalks, and textile fiber extracts from Urtica dioica L. is described. Taking into account the increasing demand for textile products made from natural fibers and the necessity to create sustainable "local" processing chains, an Italian project was funded to evaluate the cultivation of nettle fibers in the region of Tuscany. The leaves of two nettle samples, cultivated and wild (C and W), contain large amounts of chlorogenic and 2- O-caffeoylmalic acid, which represent 71.5 and 76.5% of total phenolics, respectively. Flavonoids are the main class in the stalks: 54.4% of total phenolics in C and 31.2% in W samples. Anthocyanins are second in quantitative importance and are present only in nettle stalks: 28.6% of total phenolics in C and 24.4% in W extracts. Characterization of phenolic compounds in nettle extracts is an important result with regard to the biological properties (antioxidant and antiradical) of these metabolites for their possible applications in various industrial activities, such as food/feed, cosmetics, phytomedicine, and textiles.
本研究描述了荨麻（Urtica dioica L.）叶片、茎杆及纺织纤维提取物中的酚类成分。鉴于对天然纤维制成的纺织产品的需求不断增加，以及创建可持续“本地”加工链的必要性，意大利资助了一个项目，以评估托斯卡纳地区荨麻纤维的种植情况。两个荨麻样本（种植的和野生的，分别记为C和W）的叶片含有大量绿原酸和2 - O - 咖啡酰苹果酸，分别占总酚类物质的71.5%和76.5%。黄酮类化合物是茎杆中的主要类别：在C样本中占总酚类物质的54.4%，在W样本中占31.2%。花色苷在数量上居第二位，且仅存在于荨麻茎杆中：在C提取物中占总酚类物质的28.6%，在W提取物中占24.4%。荨麻提取物中酚类化合物的表征是一项重要成果，因为这些代谢物具有生物学特性（抗氧化和抗自由基），可能应用于各种工业活动，如食品/饲料、化妆品、植物医学和纺织品。
