Chepel Victoria, Lisun Valery, Skrypnik Liubov
Laboratory of Natural Antioxidants, Institute of Living Systems, Immanuel Kant Baltic Federal University, Universitetskaya str., 2, 236040 Kaliningrad, Russia.
Laboratory of Microbiology and Biotechnologies, Institute of Living Systems, Immanuel Kant Baltic Federal University, Universitetskaya str., 2, 236040 Kaliningrad, Russia.
Plants (Basel). 2020 Jul 22;9(8):926. doi: 10.3390/plants9080926.
Heather ( (L.) Hull.) is noted for a diverse chemical composition and a broad range of biological activity. The current study was aimed at monitoring changes in the accumulation of certain groups of phenolic compounds in various organs of heather (leaves, stems, roots, rhizomes, flowers, and seeds) at different growth stages (vegetative, floral budding, flowering, and seed ripening) as well as studying antioxidant (employing the DPPH and FRAP assays) and antibacterial activity of its extracts. The highest total amount of phenolic compounds, tannins, flavonoids, hydroxycinnamic acids, and proanthocyanidins was detected in leaves and roots at all growth stages, except for the flowering stage. At the flowering stage, the highest content of some groups of phenolic compounds (flavonoids, proanthocyanidins, and anthocyanins) was observed in flowers. Highest antioxidant activity was recorded for the flower extracts (about 500 mg of ascorbic acid equivalents per gram according to the DPPH assay) and for the leaf extract at the ripening stage (about 350 mg of ascorbic acid equivalents per gram according to the FRAP assay). Strong correlation was noted between antioxidant activity (DPPH) and the content of anthocyanins ( = 0.75, ≤ 0.01) as well as between antioxidant activity (FRAP) and the total content of phenolic compounds ( = 0.77, ≤ 0.01). Leaf extracts and stem extracts turned out to perform antibacterial action against both gram-negative and gram-positive bacteria, whereas root extracts appeared to be active only against , and rhizome extracts against .
石南（Heather ( (L.) Hull.)）以其多样的化学成分和广泛的生物活性而闻名。当前的研究旨在监测石南不同器官（叶、茎、根、根茎、花和种子）在不同生长阶段（营养期、花芽期、花期和种子成熟期）中某些酚类化合物积累的变化，以及研究其提取物的抗氧化活性（采用DPPH和FRAP测定法）和抗菌活性。除花期外，在所有生长阶段，叶和根中检测到的酚类化合物、单宁、黄酮类化合物、羟基肉桂酸和原花青素的总量最高。在花期，花中观察到某些酚类化合物（黄酮类化合物、原花青素和花青素）的含量最高。花提取物的抗氧化活性最高（根据DPPH测定法，约为每克500毫克抗坏血酸当量），而成熟期叶提取物的抗氧化活性最高（根据FRAP测定法，约为每克350毫克抗坏血酸当量）。抗氧化活性（DPPH）与花青素含量之间存在强相关性（ = 0.75， ≤ 0.01），抗氧化活性（FRAP）与酚类化合物总含量之间也存在强相关性（ = 0.77， ≤ 0.01）。叶提取物和茎提取物对革兰氏阴性菌和革兰氏阳性菌均表现出抗菌作用，而根提取物似乎仅对 有活性，根茎提取物对 有活性。
