Viapiana Agnieszka, Wesolowski Marek
Department of Analytical Chemistry, Medical University of Gdansk, Gen. J. Hallera 107, 80-416, Gdansk, Poland.
Plant Foods Hum Nutr. 2017 Mar;72(1):82-87. doi: 10.1007/s11130-016-0594-x.
The aim of this work was to evaluate the antioxidant potential of teas prepared from twenty-four commercially available berries and flowers of Sambucus nigra L. in relation to their phenolic profile, as reflected by the most representative phenolic acids (caffeic, chlorogenic, p-coumaric, ferulic, gallic and syringic acids); flavonols (quercetin, kaempferol, myricetin and rutin); and total phenolic (TPC), phenolic acid (TAC) and flavonoid (TFC) contents. The infusions prepared from elderflowers contained more abundant phenolic compounds than the elderberry infusions. The TPC of these infusions ranged from 19.81 to 23.90 mg of gallic acid equivalents/g dry weight of sample (GAE/g DW) for elderberries and from 15.23 to 35.57 mg GAE/g DW for elderflowers, whereas the TFC ranged from 2.60 to 4.49 mg of rutin equivalents/g dry weight of sample (RUTE/g DW) in elderberry infusions and from 5.27 to 13.19 mg RUTE/g DW in elderflower infusions. Among the phenolic compounds quantified in this study, quercetin (2.07-9.48 mg/g DW) and myricetin (1.17-9.62 mg/g DW) had the highest concentrations in the teas prepared from berries and flowers, respectively. Moreover, the antioxidant potential of elder infusions assessed by 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical and ferric reducing antioxidant power (FRAP) assays revealed that the teas prepared from flowers had higher mean DPPH and FRAP activities than the teas prepared from berries. Therefore, elder beverages could be important dietary sources of natural antioxidants that contribute to the prevention of diseases caused by oxidative stress.
本研究旨在评估由24种市售黑接骨木浆果和花朵制备的茶的抗氧化潜力，并研究其酚类成分，以最具代表性的酚酸（咖啡酸、绿原酸、对香豆酸、阿魏酸、没食子酸和丁香酸）、黄酮醇（槲皮素、山奈酚、杨梅素和芦丁）以及总酚（TPC）、酚酸（TAC）和类黄酮（TFC）含量为指标。接骨木花制备的浸液比接骨木浆果制备的浸液含有更丰富的酚类化合物。这些浸液的TPC，接骨木浆果为19.81至23.90毫克没食子酸当量/克样品干重（GAE/g DW），接骨木花为15.23至35.57毫克GAE/g DW；而TFC，接骨木浆果浸液为2.60至4.49毫克芦丁当量/克样品干重（RUTE/g DW），接骨木花浸液为5.27至13.19毫克RUTE/g DW。在本研究中定量的酚类化合物中，槲皮素（2.07 - 9.48毫克/克DW）和杨梅素（1.17 - 9.62毫克/克DW）分别在浆果和花朵制备的茶中含量最高。此外，通过2,2 - 二苯基 - 1 - 苦基肼（DPPH）自由基和铁还原抗氧化能力（FRAP）测定评估的接骨木浸液的抗氧化潜力表明，花制备的茶比浆果制备的茶具有更高的平均DPPH和FRAP活性。因此，接骨木饮品可能是天然抗氧化剂的重要饮食来源，有助于预防由氧化应激引起的疾病。
