Papers by Author: Jing Wang

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Authors: Liang Wu Bi, Qiu Ge Zhang, Peng Wang, Zhen Dong Zhao, Da Wei Li, Yu Xiang Chen, Dong Mei Li, Yan Gu, Jing Wang, Xian Zhang Liu
Abstract: Turpentine-based dipentene (TBDP) contains limonene 30.32 %, terpinolene 31.35 %, α-terpinene 7.55 %, γ-terpinene 6.40 % and p-cymene 12.87 %. Three Pd/C catalysts were characterized by BET, XRD, TG-DTG and atomic absorption spectrometry (AAS). The properties of the catalysts on TBDP conversion were compared. Difference of catalytic competitive reactions of TBDP by catalyst A with the change of reaction temperature was discussed in detail. The yield of p-cymene at 280-310°C was over 95.0 %. It was important to control the reaction temperature for TBDP dehydrogenation catalyzed by Pd/C catalysts. It is valuable to probe the catalytic behaviors of Pd/C catalyst on TBDP dehydrogenation for research and development of efficient preparation technology of p-cymene from TBDP.
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Authors: Da Wei Li, Liang Wu Bi, Zhen Dong Zhao, Dong Mei Li, Yan Gu, Jing Wang, Xian Zhang Liu
Abstract: A study to track and detect the variation of bioactive components in rosemary extraction solution and extracts, by adding organic acid synergists, such as citric acid, oxalic acid and tartaric acid, was performed using high performance liquid chromatography (HPLC). Ultrasound was also used to increase the extraction efficiency, improve the yields of rosemary extracts and shorten the extraction time. The experimental results showed that the content of the key bioactive component carnosic acid was easier to reduce during the storage of extraction solution and extracts, meanwhile, adding citric acid, oxalic acid and tartaric acid during the extraction could actually slow down the trend of the reduction of the bioactive components, especially for carnosic acid.
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Authors: Da Wei Li, Liang Wu Bi, Zhen Dong Zhao, Dong Mei Li, Yan Gu, Jing Wang, Xian Zhang Liu
Abstract: The variation regulation of five bioactive components including carnosic acid (CA), carnosol (CO), rosmarinic acid (RA), oleanolic acid (OA) and ursolic acid (UA) in rosemary leaves and extraction procedure was studied. The effects of rosemary sources, steam distillation time, activated carbon dosage and storage time of extraction solution on variation regulation of bioactive components were discussed in detail.
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