Papers by Author: Meng Qi Wang

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Authors: Fu Rong Shan, Meng Qi Wang, Yang Bai, Zhi Ming Yu
Abstract: The research presented in the paper focuses on the specific process of Gutta-percha extraction and refinement. Gutta-percha was extracted from the residues of leaves, which is based on the comprehensive utilization technology of Eucommia Ulmoides leaves. After extracted and separated chlorophyll, β-carotene, lignans, aucubin, chlorogenic acid, flavonoid, polysaccharide and proteins, etc. with the method of Multi-stage Countercurrent Extraction, the green leaves changed into the residues, which was then steeped in petroleum ether (whose boiling range is from 60 to 90°C) and generated precipitation in acetone. The results of this research indicate that: Gutta-percha extracted from the residues owns light color, which resolves the big issue that the gum was restricted for deep color in exportation. Besides, the yield of the gum in this experiment is approximate 2.0%, the increasing rate rising by 17.6% compared with 1.7% of other immediate extraction methods’. What’s more, the cost of the process flows introduced in the paper is lower than others, with less consumption, less waste and more efficient solvent circle utilization. And a new way for gutta-percha extraction was presented.
Authors: Fu Rong Shan, Zhi Ming Yu, Meng Qi Wang, Yang Zhang
Abstract: Silane coupling agent KH550 was used to modify the surface of nano-alumina. Ultrasonic dispersion was employed to take the place of traditional mechanical stir. Absorbency of the aqueous solution of nano-Al2O3, which had been modified, was determined to confirm that under this process condition the optimum amount of KH550 was 2.5% while the optimum time was 50 minutes. The infrared spectra indicated that the surface of nano-Al2O3 had been modified and the absorption of KH550 really existed there.
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