ABSTRACT
To screen active components of Desmodium styracifolium in protecting calcium oxalate monohydrate (COM) -induced human proximaltubular epithelial cell (HK-2) damage model, and furtherly explore its mechanism of action, total flavonoids of Desmodium styracifolium (TFDS) and eight flavonoids (schaftoside, isoschaftoside, vicenin-2, isovitexin, isoorientin, apigenin, luteolin and genistein) were tested by COM-induced HK-2 damage model. MTT assay was used to detect the effects of different components on the cell viability of COM-induced HK-2 damage model. The lactate dehydrogenase (LDH) release in the cell supernatant and the activity level of superoxide dismutase (SOD) and reactive oxygen species (ROS) of cell were detected by the kit. Western blot was used to detect the expression levels of NLRP3, caspase-1, HMGB1 in HK-2 of different groups. Compared with the model group, the cell activity was significantly increased after 24 h co-culture with TFDS and four flavonoids (isoorientin, apigenin, genistein and luteolin). These active components can reduce the LDH leakage and ROS in cell supernatant and increase the activity of SOD, with regulating the expression of NLRP3, caspase-1, HMGB1. TFDS, apigenin, isoorientin, luteolin and genistein can protect COM-induced HK-2 cell damage, including enhancing cell viability, protecting cell membrane integrity and enhancing oxidative stress, and regulate the expression of proteins related to NLRP3 inflammasome.
ABSTRACT
To explore the volatile profiles and the contents of ten bioactive components (polyphenols and caffeine) of sun-dried Pu-erh tea leaves from ancient tea plants on Bulang Mountain, 17 samples of three tea varieties were analyzed by headspace-solid phase microextraction-gas chromatography-mass spectrometry (HS-SPME-GC-MS) and high-performance liquid chromatography (HPLC). A total of 75 volatile components were tentatively identified. Laomaner (LME), Laobanzhang (LBZ), and other teas on Bulang Mountain (BL) contained 70, 53, and 71 volatile compounds, respectively. Among the volatile compounds, alcohols (30.2%–45.8%), hydrocarbons (13.7%–17.5%), and ketones (12.4%–23.4%) were qualitatively the most dominant volatile compounds in the different tea varieties. The average content of polyphenol was highest in LME (102.1 mg/g), followed by BL (98.7 mg/g) and LBZ (88.0 mg/g), while caffeine showed the opposite trend, 27.3 mg/g in LME, 33.5 mg/g in BL, and 38.1 mg/g in LBZ. Principal component analysis applied to both the volatile compounds and ten bioactive components showed a poor separation of samples according to varieties, while partial least squares-discriminant analysis (PLS-DA) showed satisfactory discrimination. Thirty-four volatile components and five bioactive compounds were selected as major discriminators (variable importance in projection (VIP) >1) among the tea varieties. These results suggest that chromatographic data combined with multivariate analysis could provide a useful technique to characterize and distinguish the sun-dried Pu-erh tea leaves from ancient tea varieties on Bulang Mountain.
ABSTRACT
To explore the volatile profiles and the contents of ten bioactive components (polyphenols and caffeine) of sun-dried Pu-erh tea leaves from ancient tea plants on Bulang Mountain, 17 samples of three tea varieties were analyzed by headspace-solid phase microextraction-gas chromatography-mass spectrometry (HS-SPME-GC-MS) and high-performance liquid chromatography (HPLC). A total of 75 volatile components were tentatively identified. Laomaner (LME), Laobanzhang (LBZ), and other teas on Bulang Mountain (BL) contained 70, 53, and 71 volatile compounds, respectively. Among the volatile compounds, alcohols (30.2%-45.8%), hydrocarbons (13.7%-17.5%), and ketones (12.4%-23.4%) were qualitatively the most dominant volatile compounds in the different tea varieties. The average content of polyphenol was highest in LME (102.1 mg/g), followed by BL (98.7 mg/g) and LBZ (88.0 mg/g), while caffeine showed the opposite trend, 27.3 mg/g in LME, 33.5 mg/g in BL, and 38.1 mg/g in LBZ. Principal component analysis applied to both the volatile compounds and ten bioactive components showed a poor separation of samples according to varieties, while partial least squares-discriminant analysis (PLS-DA) showed satisfactory discrimination. Thirty-four volatile components and five bioactive compounds were selected as major discriminators (variable importance in projection (VIP) >1) among the tea varieties. These results suggest that chromatographic data combined with multivariate analysis could provide a useful technique to characterize and distinguish the sun-dried Pu-erh tea leaves from ancient tea varieties on Bulang Mountain.
ABSTRACT
Traditional Chinese medicine is the treasure of China and the people of the world.With the standardization and internationalization of traditional Chinese medicine,the effective components or monomers of Chinese herbal medicines should be clarified and investigated.Although researches on effective components of Chinese herbal medicines have been increasing year by year,there is a lack of systematic induction.In this review,we summarized the traditional Chinese medicines which have therapeutic effects on the eye diseases recorded in Chinese Pharmacopoeia (2015 edition).According to the information from published books and literature reports,the relevant bioactive constituents of these Chinese medicines and the possible mechanisms of their pharmacological actions are summarized and categorized here in 5 aspects:antipathogenic microbial action,anti-inflammation and immunomodulation,anti-oxidation,neuroprotection,and vascular protection.We hope that this review will provide some theoretical basis and reference for the researchers who are dedicated to the treatment of ophthalmic diseases and the research and development of traditional Chinese medicines.
ABSTRACT
To compare the appearances, tastes, contents of bioactive components and antioxidant activity of Lyceum ruthenicum under different drying methods, so as to direct its production practice. The folin-phenol colorimetric method, UV, extinction coefficient method and DPPH, as well as fluorescence recovery after photobleaching (FRAP) method to determine the contents of polyphenols, proanthocyanidins, total anthocyanin and antioxidant activity under different drying methods： vacuum freeze drying, low-temperature oven drying and air drying for L. ruthenicum. The results showed that the drying methods had certain effects on its appearances, tastes, contents of bioactive components and antioxidant activity. The appearances and tastes were best after the L. ruthenicum was dried by vacuum freeze drying, with significantly lower moisture than air drying method. The contents of total polyphenols, anthocyanin and proanthocyanidins were highest by air-drying but lowest by low temperature oven drying in L. ruthenicum. The scavenging ability to DPPH was strongest by freeze-drying and lowest by low temperature oven drying, while the antioxidant activity was strongest by air-drying in the FRAT method. In addition, the appearances and tastes were poor in air drying, with higher moisture but highest contents of the three bioactive components. Therefore, the drying methods for L. ruthenicum shall be comprehensively considered.
ABSTRACT
Mori Folium (mulberry leaves or the leaves of Morus alba) as one of Chinese materia medica and food raw materials, its research and application in the treatment of diabetes and diabetic complications have become an increasing concern to the majority of scientists. With deepening the basic research and industrial development of Mori Folium, the bioactive component groups and their action mechanisms of Mori Folium used for the prevention and treatment of diabetes and diabetic complication continue to be revealed. In this paper, based on the previous research, we summarize and analyze the understanding of domestic and foreign scholars about the pathogenesis of diabetes and the active component groups and their action mechanisms of Mori Folium for the prevention and treatment of diabetes and diabetic complication in recent years in order to provide the guidance for the further study and the reference for the development and utilization of Mori Folium resource.
ABSTRACT
Chronic constipation is a highly debilitating condition, affecting a significant proportion of the commu-nity. Rhei Radix et Rhizoma (rhubarb) is one of the important herbal drugs used in traditional Chinese medicine (TCM) for treating constipation which includes four groups of main active components such as free anthraquinone, conjunc-tive anthraquinone, rhubarb tannin, and rhubarb polysaccharides. However, which one is response for the laxative effect of rhubarb is unknown. Therefore, we proposed a strategy for the effect-guided quality control of TCM based on disease. The effective material for laxative effect of rhubarb was firstly screened based on the constipation model. And different production locations were investigated. Then, the processing was optimized to set up a quality control of rhubarb. It was found that the bioactive component was the conjunctive anthraquinone for the laxative effect. And the raw herb from Liangshan had the best quality compared with those from Pingwu and Beichuan in Sichuan Prov-ince, China. The extraction ethanol volumes to substrate ratio of 10.34, extraction time of 24.25 min and extraction number of 4 were the best conditions for the extraction of conjunctive anthraquinone. Under the optimized condi-tions, the maximum production was 5.455 mg·g-1. This extraction procedure was used as quality control of rhubarb in the treatment of constipation.