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  • Vietnam National University Journal of Science  (4)
  • Thanh Hoa, Ha  (4)
  • 1
    In: VNU Journal of Science: Medical and Pharmaceutical Sciences, Vietnam National University Journal of Science, Vol. 39, No. 2 ( 2023-06-20)
    Abstract: Herba Siegesbeckiae is a medicinal material derived from the aerial part of Siegesbeckia orientalis, which is used to treat various types of pain such as back, knees, bones, joints, and numbness of limbs. This plant contains several phenolic compounds, including chlorogenic acid (1), caffeic acid (2), and rutin (3). They were chosen as marker compounds to develop a quantification method. In this study, a high-performance liquid chromatography (HPLC) method with a DAD detector was used to simultaneously quantify these three compounds (1-3). The Agilent C18 column (250 x 4.6 mm; 5 µm) was used for the separation of the analytes, and the mobile phase consisted of MeCN - 0.1% phosphoric acid in water with gradient elution. The flow rate was 1.0 ml/min, and the detection wavelength was 320 nm for 1 and 2, and 360 nm for 3. The injection volume was 20 µl. The method was validated according to the guidelines of ICH and AOAC on system suitability, specificity, linearity, precision, and accuracy. The established quantification method was applied to determine the content of compounds 1, 2, and 3 in samples of Herba Siegesbeckiae, which were found to be 0.09-0.82 mg/g, 0.02-0.21 mg/g, 0.07-0.52 mg/g, respectively. This quantification method can be used to assess the quality of Herba Siegesbeckiae and related products.
    Type of Medium: Online Resource
    ISSN: 2588-1132 , 2615-9309
    Language: Unknown
    Publisher: Vietnam National University Journal of Science
    Publication Date: 2023
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  • 2
    In: VNU Journal of Science: Medical and Pharmaceutical Sciences, Vietnam National University Journal of Science, Vol. 39, No. 2 ( 2023-06-21)
    Abstract: The purpose of this study was to develop an HPLC method for the simultaneous quantification of rosmarinic acid and sinensetin in Herba Orthosiphonis spiralis. The chromatographic separation was performed on an Ascentis®C8 column (250 × 4.6 mm, 5 µm) using a gradient elution mode with acetonitrile and water containing 0.1% formic acid as mobile phase. The flow rate was maintained at 0.6 mL/min. The injection volume was 10 mL. The column temperature was set at 40 °C. Analytes were detected by a PDA detector at a wavelength of 329 nm. The method was validated for specificity, system suitability, linearity, accuracy, precision, detection limit, and quantitation limit according to ICH and AOAC. The results of validation showed that the method met all the acceptance criteria and was suitable for simultaneous quantification of rosmarinic acid and sinensetin in Herba Orthosiphonis spiralis.
    Type of Medium: Online Resource
    ISSN: 2588-1132 , 2615-9309
    Language: Unknown
    Publisher: Vietnam National University Journal of Science
    Publication Date: 2023
    Location Call Number Limitation Availability
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  • 3
    Online Resource
    Online Resource
    Vietnam National University Journal of Science ; 2022
    In:  VNU Journal of Science: Medical and Pharmaceutical Sciences Vol. 38, No. 4 ( 2022-12-18)
    In: VNU Journal of Science: Medical and Pharmaceutical Sciences, Vietnam National University Journal of Science, Vol. 38, No. 4 ( 2022-12-18)
    Abstract: Berberine is a quaternary benzylisoquinoline alkaloid that has been used for the local treatment of gastrointestinal tract diseases. Recently, several pharmacological effects of berberine have been reported, which include anti-hypertension, antitumor, anti-hypercholesterolemia, and neuroprotective effects. However, berberine has exhibited poor aqueous solubility and low oral bioavailability. To overcome these limitations, this study aims to develop and investigate nano berberine. Nano berberine fabricated by ball milling method is a simple process and easily applied in the production scale. The characterization of nano berberine was evaluated, including appearance, particle size, potential zeta, dissolution in vitro in a phosphate buffer media (pH 6.8), differential scanning calorimetry (DSC) analysis, fourier transformed infrared spectroscopy (FTIR), and X-ray diffraction analysis (XRD). Results from this study showed that spray-dried nano berberine powder was almost uniform in size, particle size average of 570.7 nm, and potential zeta of -28.6 mV. The dissolution in vitro study revealed that nano berberine was about 2 times more soluble than raw berberine for 60 minutes. No incompatibility between drug and excipients can be observed through FTIR and DSC analysis. XRD analysis suggested that raw berberine and nano berberine might exist in a crystal form. Thus, findings from this study indicate that the physicochemical properties of spray-dried nano berberine may increase the bioavailability of oral berberine.  
    Type of Medium: Online Resource
    ISSN: 2588-1132 , 2615-9309
    Language: Unknown
    Publisher: Vietnam National University Journal of Science
    Publication Date: 2022
    Location Call Number Limitation Availability
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  • 4
    Online Resource
    Online Resource
    Vietnam National University Journal of Science ; 2023
    In:  VNU Journal of Science: Medical and Pharmaceutical Sciences Vol. 39, No. 1 ( 2023-03-25)
    In: VNU Journal of Science: Medical and Pharmaceutical Sciences, Vietnam National University Journal of Science, Vol. 39, No. 1 ( 2023-03-25)
    Abstract: Abstract: Treatment of fungal infections is very difficult because of the limited therapeutic arsenal and the emergence of resistance to the two major antifungal classes: azoles and echinocandins. Consequently, finding new targets and new therapeutic strategies is a priority. The protein kinase Pkc1 of Candida albicans (CaPkc1), one of the key proteins involved in MAPK pathways, is described as a regulator of cell wall integrity during growth, morphogenesis, and response to cell wall stress. Therefore, the discovery of CaPkc1 inhibitory molecules can open up new and promising prospects in the development of new antifungal drugs that inhibit CaPkc1. In this study, we evaluated the CaPkc1 inhibitory activity of three benzofuro[3,2-d]pyrimidine derivatives at three different concentrations of 50 µM, 100 µM, and 150 µM. A concentration of 100 μM was optimal for CaPkc1 inhibitory activity with all three benzofuro[3,2-d]pyrimidine derivatives. Keywords: Benzofuro[3,2-d]pyrimidine, CaPkc1, Candida albicans, antifungal activity.     
    Type of Medium: Online Resource
    ISSN: 2588-1132 , 2615-9309
    Language: Unknown
    Publisher: Vietnam National University Journal of Science
    Publication Date: 2023
    Location Call Number Limitation Availability
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