CIMO/Escola Superior Agrária, Instituto Politécnico de Bragança, Campus de Santa Apolónia, Apartado 1172, 5301-855 Bragança, Portugal.
Food Chem. 2012 Dec 1;135(3):1028-35. doi: 10.1016/j.foodchem.2012.05.038. Epub 2012 May 11.
The antioxidant activity and phytochemical composition (ascorbic acid, free sugars and phenolic compounds) of decoctions and infusions of wild and commercial samples of Tuberaria lignosa (Sweet) Samp. Aerial parts were evaluated and compared. Among wild samples, the effects of the drying method (freeze or shade-drying) on those parameters were studied. Infusion of the freeze-dried wild sample gave the highest levels of sugars, while infusion of shade-dried wild sample and decoction of the freeze-dried sample presented higher ascorbic acid and phenolic compounds content (including ellagitannins and flavonoids) than the other samples. The last two samples also revealed higher antioxidant activity, in some cases even higher than Trolox. Decoctions gave lower amounts of disaccharides than infusions, which seemed to be hydrolysed, increasing the content of monosaccharides. Commercial samples showed the lowest content in phenolic compounds, mainly in ellagitannins and flavonoids, and also the lowest antioxidant activity. This work gives scientific evidence to the traditional medicinal uses of wild Tuberaria lignosa, highlighting the interest of its decoctions and infusions as a source of bioactive compounds and functional beverages.
评估并比较了野生和商业样本的 Tuberaria lignosa（Sweet）Samp. 地上部分的水提液和浸提液的抗氧化活性和植物化学成分（抗坏血酸、游离糖和酚类化合物）。在野生样本中，研究了干燥方法（冷冻或阴凉干燥）对这些参数的影响。冻干野生样本的浸提液中游离糖含量最高，而阴干野生样本的浸提液和冻干样本的煎剂中抗坏血酸和酚类化合物含量（包括鞣花单宁和类黄酮）高于其他样本。后两种样本的抗氧化活性也较高，在某些情况下甚至高于 Trolox。与浸提液相比，煎剂中双糖的含量较低，这似乎是被水解了，增加了单糖的含量。商业样本中酚类化合物含量最低，主要是鞣花单宁和类黄酮，抗氧化活性也最低。这项工作为野生 Tuberaria lignosa 的传统药用用途提供了科学依据，突出了其煎剂和浸提液作为生物活性化合物和功能性饮料的来源的重要性。
