作者机构：
College of Material Science and Engineering, Central South Forestry Science & Technology University,;South China Agricultural University, Guangzhou 510640,China
会议名称：
2006中日稻米品质测控及美味技术学术研讨会
会议时间：
2006-08-03
会议地点：
北京
会议论文集名称：
中山大学学报（自然科学版）
关键词：
gas chromatography;mass spectrometry;extractives;Eucalyptus urograndis
摘要：
The chemical components of benzene/ethanol extractives of fresh Eucalyptus urograndis wood chips were separated and identified by GC/ MS after enriching. Relative content of each chemical component was determined by area normalization. Thirty compounds representing 87.88％ of the extractives which take on 42 peaks were identified. The most abundant and valuable constituents were 1,2-benzenedicarboxylic acid, diisooctyl ester (17.53％), 1,2- benzenedicarboxylic acid, bis (2- methylpropyl) ester (8.48％), dibutyl phthalate (8.12％), butanedioic acid, methyl-, bis (1-methylpropyl) ester (7.02％), hexanedioic acid, bis (2-methylpropyl) ester (6.89％), 2, 6, 10, 15, 19, 23-hexamethyl-2, 6, 10, 14, 18, 22- tetracosahexaene (4.53％), hexadecanoic acid, ethyl ester (3.77％), 2-isopropyl-1-methylnaphthalene (2.97％), hexacosane (2.63％), di (2-ethylhexyl) adipate (1.98％ ) , octacosane (1.93％), salsoline (1.90％ ) and so on.
作者机构：
Material Science and Engineering School, Central-South Forestry Science and Technology University, Changsha 410004, China;[Li W.-J.; Zhang B.-G.] College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China;[Li Y.-J.] School of Engineering, Zhejiang Forestry College, Lin'an 311300, China;[Li X.-J.] Material Science and Engineering School, Central-South Forestry Science and Technology University, Changsha 410004, China, College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China
通讯机构：
[Li, X.-J.] M;Material Science and Engineering School, , Changsha 410004, China
摘要：
The law of temperature distribution inside wood using Pinus massoniana as experimental material had been researched during microwave-vacuum drying for the first time. The results showed that, with a certain scope of radiation power (160 kW/m3) and wood thickness (60 mm), temperature distribution inside wood was uniform, and there was not regular temperature gradient along the direction of wood thickness; the inner temperature difference of wood presented a growing trend in the last period of drying; during microwave-vacuum drying, inner temperature difference of wood was caused by microwave field and the differences of dielectric characteristics among different locations in wet wood, and this kind of non-uniformity existed locally in wood.
摘要：
A close-looped flow-sheet based on the ion exchange membrane-electro-winning coupling(IEMEC) technology was proposed to regenerate an acidic copper etcher on-site, recover copper selectively and recycle its use. It was characterized by selective recovery of copper from the spent etcher accomplished by IEMEC, and at the same time all the other components useful for etching were regenerated. The results show that at least 90% of electricity efficiency for copper recover in the IEMEC process can be maintained and the optimum conditions are as follows: cell voltage 1.5 - 2.5 V, operating temperature 35 - 45 degrees C, keeping copper content in the cathode chamber at 20 - 60 g/L and current density 0.4 - 1.2 A/m(2). The regenerated etcher can be successfully reused to etch copper after adjusting its composition to the normal range, and its recycling property is as good as that of the fresh etcher after 50 times of use-recover-regeneration cycles.
摘要：
采用乙醇提取法,研究香樟叶黄酮类化合物的提取工艺.以芦丁为标准样品,建立了芦丁标准工作曲线回归方程: A=12.2875C-0.014667,相关系数r=0.9995.用正交实验研究了乙醇浓度、料液比、提取温度和提取时间对黄酮类化合物提取率的影响.结果表明,最优提取条件为:乙醇浓度60%,料液比1∶10,温度75℃,提取时间2.5 h.
