Department of Physical and Analytical Chemistry, Faculty of Experimental Sciences, University of Jaén, Campus Las Lagunillas, E-23071 Jaén, Spain.
Department of Physical and Analytical Chemistry, Faculty of Experimental Sciences, University of Jaén, Campus Las Lagunillas, E-23071 Jaén, Spain.
Food Chem. 2019 Jul 30;287:258-264. doi: 10.1016/j.foodchem.2019.02.101. Epub 2019 Feb 28.
In order to value J. glutinosa DC (rock tea), we characterised its phenolic profile and antioxidant activity. The study was performed in aqueous extracts before and after a simulated in vitro digestion to obtain data regarding phenolics bioavailability. Methanolic extracts were also analysed for comparison purposes. Phytochemical profiles were determined by high-performance liquid chromatography with mass spectrometric detection, whereas total phenolic content (TPC) and antioxidant assays were performed by conventional spectrophotometric methods. The most abundant compounds were dicaffeoylquinic acids, representing more than 90% of phenolics in tea infusions. Statistically significant differences were observed for all parameters except for TPC in methanol and aqueous extracts. Both phenolics amount and antioxidant activities were lower after the in vitro digestion of the infusions. However, although phenolics were lost during the simulated digestion, rock tea is still a good source of bioactive compounds with potential applications in the pharmaceutical or nutraceutical industries.
为了评估羽叶金合欢（岩茶）的价值，我们对其酚类成分和抗氧化活性进行了研究。研究分别在水提物和模拟体外消化后的水提物中进行，以获得有关酚类生物利用度的数据。同时还对甲醇提取物进行了分析，以便进行比较。采用高效液相色谱-质谱联用技术测定植物化学成分的特征，采用常规分光光度法测定总酚含量（TPC）和抗氧化测定。最丰富的化合物是二咖啡酰奎宁酸，占茶浸出物中酚类物质的 90%以上。除甲醇和水提物中的 TPC 外，所有参数均有统计学差异。在体外消化后，酚类物质的含量和抗氧化活性均降低。然而，尽管在模拟消化过程中酚类物质有所损失，但岩茶仍然是生物活性化合物的良好来源，具有在制药或营养保健品行业应用的潜力。
