Subjects: Biology >> Botany >> Applied botany submitted time 2023-06-05 Cooperative journals: 《广西植物》
Abstract： Rubus suavissimus is mainly distributed in Guilin, Liuzhou, Wuzhou and other regions in Guangxi Zhuang Autonomous Region, so it is called as “Guangxi tiancha” in Chinese. R. suavissimus, together with Siraitia grosvenorii and Stevia rebaudianastevia are praised as three famous sweet plants in Guangxi Zhuang Autonomous Region. Zhuang and Yao people use the leaves of R. suavissimus as a tea to treat diabetes, and it is known as the “divine tea” of Yao medicine. Therefore, R. suavissimus is a combination of sugar, tea and medicine, which has great potential for the development of food and medicine. In order to investigate the secondary metabolites with α-glucosidase inhibitory activity from R. suavissimus, herein, the extraction, separation and purification of secondary metabolites were performed on the leaves of R. suavissimus. The structures of purified compounds were determined based on the data of mass spectrometry (HR-ESI-MS) and nuclear magnetic resonance (1H NMR and 13C NMR). In addition, the α-glucosidase inhibitory activity of the purified compounds were evaluated by pharmacological methods simultaneously. The results were as follows: (1) Ten compounds were purified and their structures were elucidated as rubusoside (1), kaempferol 3-O-robinobioside (2), gallic acid (3), dehydroconiferyl alcohol (4), 5-methoxydehydroconiferyl alcohol (5), brevifolincarboxylic acid (6), steviolmonoside (7), steviol (8), 16α, 17-dihydroxykaurane (9), and quercetin 3-O-β-D-galactopyranoside (10). (2) Among them, compounds 2, 4, 5 and 9 were isolated from R. suavissimus for the first time. Compounds 2, 3, 5, 6 and 10 showed strong inhibitory activity on α-glucosidase. The IC50 values of compounds 2, 3, 5, 6 and 10 were (0.14 ± 0.03) mg • mL-1, (0.36 ± 0.02) mg • mL-1, (0.44 ± 0.01) mg • mL-1, (0.53 ± 0.04) mg • mL-1 and (0.14 ± 0.03) mg • mL-1 respectively, which were stronger than the positive control acarbose with the IC50 values as (0.69 ± 0.02) mg • mL-1. Thus, compounds 2, 3, 5, 6 and 10, which were isolated from the leaves of R. suavissimus, could be a potential α-glucosidase inhibitors base on their bioactivity results. Compounds with α-glucosidase inhibitory activity from R. suavissimus will provide the basis for development of hypoglycemic related products.
Subjects: Biology >> Botany >> Applied botany submitted time 2021-12-19 Cooperative journals: 《广西植物》
Abstract： Zhuang medicine Shandougen, which is the dry radix and rhizome of the plant Sophora tonkinensis from the Leguminosae family, is one of the most important and famous traditional Chinese medicine in Guangxi Zhuang Autonomous Region and also distributed in Yunnan and Guizhou provinces. According to the Chinese Pharmacopoeia 2020, shandougen is used for clearing heat, removing toxicity, relieving sore throat and detumescence. In order to develop and utilize the aerial parts of S. tonkinensis more reasonably and scientifically, the studies for chemical constituents and their tyrosinase inhibitory activities of the aerial parts of S. tonkinensis were performed. Some modern chromatographic methods for the separation of chemical constituents were carried out, such as high-performance liquid chromatography, sephadex LH-20 column chromatography, MCI gel CHP 20P column chromatography, silica gel column chromatography, and thin layer chromatography. The structures of the pure compounds were established on the basis of their spectroscopic data, including the spectra of HR-ESI-MS, 1H NMR and 13C NMR. In addition, the isolated compounds were evaluated for their tyrosinase inhibitory activity through modern pharmacological methods. The results were as follows: (1) Ten compounds were separated from the aerial parts of S. tonkinensis and their structures were identified as salicylic acid (1), 4-hydroxybenzoic acid (2), luteolin (3), 8-prenylkeamferol (4), quercetin (5), daidzein (6), formononetin-7-O-β-D-glucoside (7), formononetin (8), tectorigenin (9), and genistein (10). All these compounds were isolated from the aerial parts of S. tonkinensis for the first time; (2) Compounds 4, 7 and 9 showed strong inhibitory effects toward tyrosinase after the evaluation for their biological activity. Particularly, compound 4 showed the strongest inhibitory activity with the IC50 value of (1.58 ± 0.31) × 10-5 mol·L-1. Compound 4, 7 and 9 could be a potential tyrosinase inhibitor after the analysis of bioactivity results. The above result enriches the previous studies on the chemical constituents and biological activity of the aerial parts of S. tonkinensis, further providing the scientific basis for the development and utilization of the non-medicinal parts of this herb.
Subjects: Biology >> Botany >> Applied botany submitted time 2021-11-04 Cooperative journals: 《广西植物》
Abstract： Stephania kwangsiensis, a vine plant of the Stephaniaceae family, is mainly spread in Guangxi, China. The roots of S. kwangsiensis, “Jin Bu Huan” in Chinese, is often used for sedative, insecticidal, anti-inflammatory, anti-tumor, antiviral, anti-bacterial, as well as for the treatment of Alzheimer’s disease. In order to make full use of the title plant resources, clarify its chemical components, and find the relevant active compounds, the methanol extracts of non-medicinal parts of this plant was isolated using various chromatographic methods such as positive phase Sephadex LH-20, positive phase silica gel, positive phase polyamide, and MCI gel CHP 20P. The structures of the isolated components were determined by MS, 1H NMR, 13C NMR, and other spectroscopic data analysis, as well as comparison with relevant literatures. The activities of the isolated compounds from S. kwangsiensis against bacteria (Escherichia coli, Staphylococcus aureus, Bacillus subtilis) and fungi (Fusarium oxysporum) were evaluated using filter paper method. The results were as follows: (1) 10 compounds obtained from the non-medicinal parts of this plant were identified as vomifoliol (1), grasshopper ketone (2), isocorydine(3),2-O-β-D-glucopyranosyl-D-arabinitol(4),(9S,12S,13S)-trihydroxyoctadeca-(10E,15Z)-dienoic acid (5), magnoflorine (6), corchoionoside C (7), tormentic acid (8), corydine (9), and crebanine (10). Among of them, compounds 1, 2, 4, 5, 6, 7 and 8 were isolated from this plant for the first time. Compounds 1, 2, 4, 5, 7 and 8 were firstly obtained from this genus plants. And compound 4 was found from natural products for the first time. (2) At concentration of 6 mg·mL-1, Compounds 1, 2 and 5 show weak antibacterial activities against Escherichia coli; Compound 2 exhibits weak antibacterial activities against Staphylococcus aureus; Compounds 3 and 8 display weak antibacterial activities against Bacillus subtilis. The non-medicinal parts of Stephania kwangsiensis contains large numbers of active components and have the potential of development and utilization.
Subjects: Biology >> Botany >> Applied botany submitted time 2019-03-14 Cooperative journals: 《广西植物》
Abstract：为了明确展毛野牡丹的化学成分，运用Diaion HP20SS、MCI、Sephadex LH-20柱层析和反相高效液相色谱等方法对展毛野牡丹根和茎的醇提物分别进行分离纯化，从中分离得到11个化合物，经波谱数据的分析，鉴定了它们的结构。它们是4-羟基-3-甲氧基苯酚1-O-β-D-(6'-O-没食子酰)-吡喃葡萄糖苷（1）、3,4-二羟基苯乙醇4-O-β-D-(6'-O-没食子酰基)-吡喃葡萄糖苷（2）、龙胆酸5-O-β-D-(6'-O-没食子酰基)-吡喃葡萄糖苷（3）、2,4,6-三甲氧基苯酚1-O-β-D-(6'-O-没食子酰)-吡喃葡萄糖苷 (4)、甲基6-O-没食子酰基-β-D-吡喃葡萄糖苷（5）、乙基6-O-没食子酰基-β-D-吡喃葡萄糖苷（6）、6′-O-没食子酰基黑樱苷（7）、没食子酸甲酯（8）、没食子酸乙酯（9）、2,6-二甲氧基对苯二酚4-O-β-D-吡喃葡萄糖苷（10）、 2-甲氧基对苯二酚4-O-β-D-吡喃葡萄糖苷（11）。所有化合物均为首次从展毛野牡丹中分离得到，化合物2-7、10和11为首次从该属植物中分离得到。
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