Bao-Cai Li

Kunming University of Science and Technology, Yün-nan, Yunnan, China

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Publications (13)19.58 Total impact

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    ABSTRACT: Eleven C21 steroids were isolated from chloroform extract of roots of Cynanchum otophyllumby silica gel, MCI, ODS columns, and semi-preparative HPLC. Their structures were determined by spectroscopic data analysis as otophylloside B(1), caudatin-3-O-beta-D-cymaropyranosyl-(1-->4)-beta-D-oleandropyranosyl-(1-->4)-beta-D-cymaropyranosyl-(1-->4)-beta-D-cymaropyranoside (2), caudatin-3-O-beta-D-oleandropyranosyl-(1-->4)-beta-D-oleandropyranosyl-(1-->4)-beta-D-cymaropyranosyl-(1-->4)-beta-D-cymaropyranoside (3), caudatin-3-O-beta-D-oleandropyranosyl-(1-->4)-beta-D-digitoxopyranosyl-(1-->4)-beta-D-cymaropyranoside (4), otophylloside O (5), gagamine-3-O-beta-D-oleandropyranosyl-(1-->4)-beta-D-cymaropyranosyl-(1-->4)-beta-D-cymaropyranoside (6), sinomarinoside B (7), mucronatosides C (8), wallicoside J (9), stephanoside H (10), and qinyangshengenin-3-O-beta-D-oleandropyranosyl-(1-->4)-beta-D-cymaropyranosyl-(1-->4)-beta-D-digitoxopyranoside (11). Among them, compounds 2-3, and 6-11 were separated from the roots of this plant for the first time.
    04/2014; 39(8):1450-6.
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    ABSTRACT: Four new C21 steroidal glycosides, otophylloside T–W, along with six known compounds were isolated from Cynanchum otophyllum Schneid. Their structures were elucidated based on the spectroscopic analyses.
    Phytochemistry Letters 01/2014; · 1.18 Impact Factor
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    ABSTRACT: Salvia yunnanensis, S.przewalskii var. przewalskii, and S.castanea are three species of the Salvia plants in China. In order to discover the biologically active compounds, their free radical scavengers were screened based on an off-line and on-line HPLC-2,2′-azinobis-(3-ethylbenzothiazoline-6-sulfonate) (ABTS) assay coupled with a diode array detector and tandem mass spectrometry. In the off-line assay, the roots and rhizomes (the underground part) of S. przewalskii displayed the strongest antioxidant properties, while the leaves and stems (the aerial part) of S. yunnanensis displayed the weakest activities. In the on-line assay, all of the underground parts and the aerial parts of the three plants were tested by HPLC and the underground parts of S. yunnanensis and S. przewalskii, as well as the aerial part of S.przewalskii were analyzed by LC-ESI MSn. Among the seventeen antioxidants screened, tanshinone I, salvianolic acid B, and tanshinone IIA were confirmed by authentic standards; and another five compounds were tentatively identified based on the tandem mass spectroscopy. 7,20-Epoxyroyleanone, tanshinone I, and 1-oxoferruginol were reported as antioxidants for the first time. Using the on-line method, the order of antioxidant activities was found to be salvianolic acid B > vitamin C > tanshinone I > tanshinone IIA. Furthermore, it was observed that the regression curve between negative peak areas and sample concentrations could be inflected at high concentrations.
    Analytical Letters 01/2014; 47(1). · 0.97 Impact Factor
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    ABSTRACT: Epilepsy is a serious neural disease that affects around 50 million people all over the world. Although for the majority patients with epilepsy, seizures are well controlled by currently available antiepileptic drugs (AEDs), there are still >30% of patients suffered from medically refractory epilepsy and approximately 30-40% of all epileptic patients affected by numerous side effects and seizure resistance to the current AEDs. Therefore, many researchers try to develop novel approaches to treat epilepsy, for example, to discover new antiepileptic constituents from herbal medicines. Although there are already several reviews on phytotherapy in epilepsy, most of them placed emphasis on the plant crude extracts or their isolated fractions, not pure active compounds derived from herbal medicines. This article aims to review components in herbal medicines that have shown antiepileptic or anticonvulsant properties. We searched online databases and identified articles using the preset searching syntax and inclusion criteria. The active medicinal compounds that have shown anticonvulsant or antiepileptic activity were included and classified according to structural types. We have reviewed herein the active constituents including alkaloids, flavonoids, terpenoids, saponins, and coumarins. The screening models, the seizures-inducing factors and response, the effective dose, the potential mechanisms, as well as the structure-activity relationships in some of these active components have also been discussed. The in vitro and in vivo experimental data reviewed in this paper would supply the basic science evidence for research and development of novel AEDs from medicinal plants.
    Epilepsia 12/2013; · 3.96 Impact Factor
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    ABSTRACT: How to identify active constituents of traditional Chinese medicines (TCMs) and study their interactions are key problems in the development of TCMs. The inhibitory effect of six alkaloids from Rhizoma Coptidis (RC) on Shigella dysenteriae (S. dysenteria) growth had been investigated by microcalorimetry in this study. Main active constituents of RC were confirmed by comparing their contributions to the bacteriostatic effect, and the interactions among active constituents were further researched. According to the result, in 0.8 mg-mL-1 extract of RC, the contributions of six active alkaloids including berberine, coptisine, epiberberine, palmatine and the combination of jatrorrhizine and columbamine were 52.83%, 36.31%, 2.49%, 4.27% and 3.21%, respectively. Therefore, berberine and coptisine were the main active constituents of RC that inhibited the growth of S. dysenteria. The study of interactions among the six alkaloids indicated that, 1 there were some contstituents antagonizing the inhibitory effect of RC, 2 there was a synergy effect between berberine and coptisine, 3 there were additive effects between other four alkaloids and the main active constituents. These results may provide some useful references for the establishment of the quality standard for RC and the development of multi-component TCMs.
    Yao xue xue bao = Acta pharmaceutica Sinica 12/2013; 48(12):1807-11.
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    ABSTRACT: Present study was focused on the chemical constituents of the stems and leaves of Salvia yunnanensis C . H. Wright and their anti-angiogeneic activities. The compounds were isolated by column chromatography over silica gel and Sephadex LH-20, and other isolation techniques. Their structures were elucidated on the basis of spectral analysis and chemical evidences. Their anti-angiogeneic activities were evaluated by the chicken chorioallantoic membrane (CAM) neovascularisation model. Seven compounds were separated and identified as ( + ) -spathulenol( 1), 5,7,4'-trihydroxyflavanone(2) , beta-amyrin(3), 3 beta-hydroxy-12-ursene(4), 2alpha,3 beta-dihydroxyursa-12-en-28-oic acid(5), ursolic acid (6) and 3-oxo-12-ursen-28-oic acid (7). Compounds 1, 2, 5 and 6 were obtained from this plant for the first time. Compounds 5 (an oleanane compound) and 6 (an ursane compound) could inhibit angiogenesis significantly in a dose-dependent manner.
    Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica 03/2013; 38(6):835-8.
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    ABSTRACT: Erigeron breviscapus is a well-known traditional Chinese herbal medicine. In this study, on-line HPLC-ABTS/DPPH assay coupled with MS detection were applied to screen and identify the free radical scavengers in 70% methanol extracts of E. breviscapus. Using on-line HPLC-ABTS-MS and HPLC-DPPH-MS assay, 13 radical scavengers (including 4-O-caffeoylquinic acid (4-CQA) (1), 9-caffeoyl-2,7-anhydro-2-octulosonic acid (9-COA) (2), 3-caffeoyl-2,7-anhydro-3-deoxy-2-octulopyranosonic acid (3-CDOA) (3), erigeside I (4), quercetin-3-O-glucuronide (5), eriodictyol-7-O-glucuronide (6), scutellarin (7), 1,4-di-O-caffeoylquinic acid (1,4-di-CQA) (8), 3,5-di-CQA (9), 1-malonyl-3,5-di-CQA (10), erigoster B (11), 4,5-di-CQA (12) and 4,9-di-CDOA (13)) and 9 radical scavengers (including 1, 4, 7, 8, 9, 10, 11, 12 and 13) were discovered, respectively. Furthermore, the anti-oxidative activities of 4 compounds, including 7, 9, 11 and 12 were evaluated. Reverse anti-oxidative activity order of scutellarin and 3,5-di-CQA was observed in on-line HPLC-ABTS assay and on-line HPLC-DPPH assay. To validate their anti-oxidative activities, the off-line ABTS and DPPH assays were performed. Given sufficient reaction time, 3,5-di-CQA showed higher activity than scutellarin, which was consistent with the order obtained in on-line HPLC-ABTS assay. These results revealed that on-line HPLC-ABTS assay is a more sensitive method for screening and determining free radical scavengers, especially more suitable for those compounds with slower reaction kinetics.
    Free Radical Research 03/2012; 46(3):286-94. · 3.28 Impact Factor
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    ABSTRACT: Experiential and sensory evaluation is an ancient method that remains important in the current quality control system of Traditional Chinese Medicines (TCMs). The process is rapid and convenient when evaluating the quality of crude materials in TCM markets. However, sensory evaluation has been met with skepticism because it is mainly based on experience and lacks a scientific basis. In this study, rhubarb was selected to demonstrate how color-based sensory evaluation could differentiate the quality of herbal medicines objectively. The colors of the rhubarb samples, expressed as RGB values, were obtained from different parts and forms of the plant, including the plant's surface, fracture surface color, and a powdered form with or without treatment with a color-developing reagent. We first divided the rhubarb samples into three grades based on the total content of five hydroxyanthraquinone derivatives, the major pharmacological components in rhubarb. Then, a three-layer back-propagation artificial neural network (BP-ANN), calibrated with selected training samples, was used to correlate the quality of the rhubarb with its color. The color of the rhubarb powder after coloration attained the highest accuracy (92.3%) in predicting the quality grade of the test samples with the established artificial neural networks. Finally, a standardized colorimetric grading scale was created based on the spatial distribution of the rhubarb samples in a two-dimensional chromaticity diagram according to the colors of the powdered rhubarb after color enhancement. By comparing the color between the scale and the tested samples, similar to performing a pH test with indicator paper, subjects without sensory evaluation experience could quickly determine the quality grade of rhubarb. This work illustrates the technical feasibility of the color-based grading of rhubarb quality and offers references for quantifying and standardizing the sensory evaluation of TCMs, foods and other products.
    PLoS ONE 01/2012; 7(11):e48887. · 3.73 Impact Factor
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    ABSTRACT: Currently, no bioassay is available for evaluating the toxicity of Aconitum herbs, which are well known for their lethal cardiotoxicity and neurotoxicity. In this study, we established a bioassay to evaluate the toxicity of Aconitum herbs. Test sample and standard solutions were administered to rats by intravenous infusion to determine their minimum lethal doses (MLD). Toxic potency was calculated by comparing the MLD. The experimental conditions of the method were optimized and standardized to ensure the precision and reliability of the bioassay. The application of the standardized bioassay was then tested by analyzing 18 samples of Aconitum herbs. Additionally, three major toxic alkaloids (aconitine, mesaconitine, and hypaconitine) in Aconitum herbs were analyzed using a liquid chromatographic method, which is the current method of choice for evaluating the toxicity of Aconitum herbs. We found that for all Aconitum herbs, the total toxicity of the extract was greater than the toxicity of the three alkaloids. Therefore, these three alkaloids failed to account for the total toxicity of Aconitum herbs. Compared with individual chemical analysis methods, the chief advantage of the bioassay is that it characterizes the total toxicity of Aconitum herbs. An incorrect toxicity evaluation caused by quantitative analysis of the three alkaloids might be effectively avoided by performing this bioassay. This study revealed that the bioassay is a powerful method for the safety assessment of Aconitum herbs.
    Journal of hazardous materials 11/2011; 199-200:350-7. · 4.14 Impact Factor
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    ABSTRACT: To research the effects of Na-FA on gastrointestinal movement and gastriculcer in mice. Using charcoal powder as an indicator, the effects of FA-Na on bowel movement of mice was evaluated by determining the propulsive percent-age of charcoal powder in normal mice, inhibition of small intestinal propulsion model induced by Compound Diphenoxylate and spleen asthenia and diarrhea model caused by Rheum officinale Baill; The acute gastric ulcer model was induced by intragastric alcohol given orally, the protective effect of FA-Na given ahead on gastric injury was evaluated, the ulcer index and the inhibition ratio of ulcer was calculated. FA-Na (intragastric administration) had inhibit effect on normal mice and diarrhea model caused by Rheum officinale, significantly synergetic effect on gastrointestinal asynersis induced by Compound Diphenoxylate, and protective effect on mice gastric mucosal injury cause by dehydrated alcohol. Compared with the positive control drug Ranitidine, the ulcer index and ulcer inhibition ratio large doses of FA-Na had no significant difference. The acute toxicity of FA-Na is very low, it has the effects of antidiarrheal and anti-gastric ulcer.
    Zhong yao cai = Zhongyaocai = Journal of Chinese medicinal materials 10/2011; 34(10):1565-9.
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    ABSTRACT: The present study investigated the pharmacological effects of different extracts of rhubarb on intestinal function of mice, further to explore possible reasons for the adverse effects of long-term use of rhubarb as a purgative. The total extract of rhubarb (TR) was extracted with 60% ethanol and the total anthraquinones extract (TA), total tannins extract (TT) and remaining components extract (RC) of rhubarb were separated from TR using macroporous resin. The pharmacological effects of each extract on the intestinal function of mice were evaluated by defecation test and the antidiarrhoeal activity of rhubarb tannins as well as its mechanism was studied by different animal models and histopathological examination. Both TR and TA produced purgative activities, but the purgative activity of TA was stronger than that of TR. Successive administration of TT produced an antidiarrhoeal activity in a time- and dose-dependent manner. Besides, successive administration of RC showed no significant effect on the intestinal function of mice. The antidiarrhoeal activity of rhubarb tannins was confirmed directly for the first time and its mechanism was probable that rhubarb tannins generated protein-precipitating reaction to the gastrointestinal mucosa due to its protein-precipitating action. The results confirmed that rhubarb had the diarrhoeogenic and antidiarrhoeal bidirectional effects due to the coexistence of anthraquinones and tannins. The bidirectional effects might be the reason or one of the reasons for the adverse effects of long-term use of rhubarb as a purgative.
    Journal of ethnopharmacology 02/2011; 133(3):1096-102. · 2.32 Impact Factor
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    ABSTRACT: This study is to investigate the authenticity between COLD and HOT natural attribute in the famous Chinese medicine formulas--Zuojinwan (Coptis-Evodia 6 : 1) and Fanzuojinwan (Coptis-Evodia 1 : 6) based on mice temperature tropism, and establish an objective method to estimate the difference of two natural attribute by using a cold/hot plate differentiating technology. The results indicated that the COLD nature Zuojinwan could decrease significantly the remaining rate of HOT-symptom rat on warm pad (P < 0.05). That was not notable to COLD-symptom rat. The interference result of COLD-HOT temperature tropism to COLD/HOT symptom rat in Fanzuojinwan was the reverse with the COLD nature Zuojinwan. Meanwhile, biochemical indicators which are relative to energy metabolism such as ATPase enzyme activity and total anti-oxidant capability (T-AOC), had corresponding change in the organism. In the study, the COLD and HOT natural tendency in Zuojinwan and Fanzuojinwan which were composed by the same herbs with different proportion could be expressed qualitatively, quantitatively, objectively and directly with applying animal temperature tropism, and be verified to philosophical idea of treating disease theory with "expelling heat with cold herbs and cryopathy requiring warm prescription", not "expelling heat with heat herbs and cryopathy requiring cold prescription" in ancient traditional Chinese medicine, which brings a new approach in investigation of the nature theory of traditional Chinese medicine.
    Yao xue xue bao = Acta pharmaceutica Sinica 06/2010; 45(6):791-6.
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    ABSTRACT: This study is to investigate the effect of Cordyceps sinensis and its cultured mycelia on growth and metabolism of Escherichia coli, and microcalorimetric method was carried out to evaluate its biological activity. The study will provide the basis for the quality control of Cordyceps sinensis. Experimental result will show the effect of natural Cordyceps sinensis and its cultured mycelia on growth and metabolism of Escherichia coli, with index of P(1max) and effective rate (E) by microcalorimetry, the data of experiment were studied by cluster analysis. The results showed that Cordyceps sinensis and its cultured mycelia not only can promote growth and metabolism of Escherichia coli but also can regulate the balance of intestinal microecology efficiently. When the concentrations of samples > 6.0 mg mL(-1), natural Cordyceps sinensis can promote the growth and metabolism of Escherichia coli efficiently (P < 0.05) compared with the control group, and have better dose-effect relationship with concentration (r > 0.9), its cultured mycelia does not show conspicuous auxoaction (P > 0.05) and have not dose-effect relationship with concentration (r < 0.6); when the concentration of samples < 6.0 mg mL(-1), all samples does not show conspicuous auxoaction (P > 0.05). Natural Cordyceps sinensis and its cultured mycelia can be distinguished by cluster analysis. Microcalorimetry has a good prospect on the quality evaluation of the traditional Chinese medicine.
    Yao xue xue bao = Acta pharmaceutica Sinica 06/2009; 44(6):640-4.