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Articles by Jian-Guo Jiang
Total Records ( 3 ) for Jian-Guo Jiang
  Wei Wu , Jian-Guo Jiang and He Liu
  A simple equivalent circuit of multilevel inverters to predict the deviation of node voltages was analyzed and the capacitor voltage imbalance mechanism of diode clamped multilevel inverter was analyzed. An optimization algorithm of Space Vector Pulse Width Modulation (SVPWM) for capacitor voltage balance of diode clamped multilevel inverters is presented. This algorithm predicts the deviation of node voltages for different operation modes to develop an optimization algorithm to minimize the voltage deviation among different capacitors. This algorithm selects the best switch combinations during each switching cycle to reach node voltage balance. This algorithm is naturally applicable to inverters with an arbitrary number of levels. The simulation and experimental results verify the correctness of this algorithm.
  Li Yang and Jian-Guo Jiang
  Houttuynia cordata Thunb. is a member of Saururaceae, a family mainly distributed in Eastern Asia. It has long been used in China both as an edible vegetable and in traditional medicine. Recent studies indicate that H. cordata contains abundant nutrients and active components including volatile oils, flavonoids, and water soluble polysaccharides. In addition, H. cordata exhibits a wide range of pharmaceutical activities including antibacterial, antiviral, anti-inflammatory, immunologic, anticancer, antioxidative, and antimutagenic effects. At present, injectable H. cordata has been used clinically for treating infectious disease, inflammation, and anaphylaxis. This paper provides a comprehensive review of the nutrients and pharmacologically relevant compounds of H. cordata that have been characterized to date, and of the studies supporting its medicinal use. Particular attention has been given to the pharmacological action and the state of utilization of H. cordata. Finally, future trends on H. cordata such as pharmacological components and mechanism, and the development of potential products have briefly been inferred.
  Chuan-Li Lu , Liang Zhu , Jin-Hua Piao and Jian-Guo Jiang
  Context: The rhizome of Wikstroemia indica (L.) C. A. Mey (Thymelaeaceae) is widespread in China which has been widely used in China as folk medicine for the treatment of syphilis, arthritis, whooping cough, and cancer. Due to its multiactivities, its extract has an attractive potential as a promising natural agent in the pharmaceutical industries. Objective: Aims of this study were to optimize the extraction process of the flavonoids from W. indica, and evaluate its multiple activities. Materials and methods: An orthogonal test design was employed to optimize the extraction procedure of flavonoids from W. indica. And multichromatography and spectroscopy were used to study the chemical compounds of W. indica, while several bioactivity assays were used to evaluate the antibacterial, anti-inflammatory, and antitumor activities of W. indica. Results: Optimal extraction conditions were determined: ethanol concentration was 60%; extraction time was 60 min; liquid-solid ratio was 16:1 and the power of ultrasonic instrument was 160 W. Four compounds: daphnoretin, chrysophanol, myricitrime and rutin were purified from W. indica, and chrysophanol was identified from this plant for the first time. The extract of W. indica displayed significant antimicrobial and anti-inflammatory activities. Daphnoretin showed a significant inhibition effect on CNE cells and HeLa cells lines at the concentrations ranging from 15.6 to 125 μg/mL, the tendency of antitumor effect was displayed in a concentration-dependent manner. Discussion and conclusions: Extracts of W. indica could potentially be used as a promising natural agent in the pharmaceutical industries.
 
 
 
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