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    30 November 2006, Volume 40 Issue 6 Previous Issue    Next Issue
    Study on the Extraction Process of Polyphenols from the Bark of Populus euphratica
    LIU Song;LIAO Rong-su;LI Jun-qing
    2006, 40 (6):  13-16. 
    Abstract ( 502 )   PDF (680KB) ( 869 )   Save
    On the basis of single factor test, the extraction process of polyphenols from Populus euphratica was studied by orthogonal test through the polyphenols content deter mined by Prussian Blue spectrophotometry. From the variance analysis, the order influenced extraction of polyphenols was extraction time>ratio of solid to liquid>volume fraction of solvent>extraction temperature.The results showed that the optimal extraction conditions were 40% acetone aquatic solution as extractant, 1:7 of the ratio of solid to liquid,3 h of extraction time, 45℃ of extraction temperature and 3 times of extraction. Under above optimal conditions, it was found that the polyphenols content in Populus euphratica bark was 6.10%, the extraction rate of polyphenols was 99.03%,and the average recovery of polyphenols was 94.64%.
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    An Initial Discussion on Developing Bio-energy and Organic Fertilizer from Crops Straw
    JIANG Ying-ti;ZHUANG Xiao-wei;WANG Yan-bin
    2006, 40 (6):  48-50. 
    Abstract ( 679 )   PDF (586KB) ( 939 )   Save
    The significance of developing bio-energy and organic fertilizer from crops straw was elucidated. Degradation mechanism of cellulose and lignin by white-rot fungi and the method of manufacturing marsh gas and organic fertilizer from crops straw were introduced. Expected benefits and application foreground were illustrated.
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    Statement of Biomass Energy Standard System (Ⅲ) —— Biomass Solid Fuel Standardization Progess
    LIU Jun-li;JIANG Jian-chun
    2006, 40 (6):  54-58. 
    Abstract ( 583 )   PDF (778KB) ( 1004 )   Save
    Biomass energy is a renewable and clean energy. Focusing on biomass energy products and according to their different physical states,the standardization system of biomass energy is proposed in the course series on the basis of investigation of the international standardization of major products. The progress of biomass solid fuel standardization is reviewed in this paper. On the basis of analyzing the status of international solid biofuel industry development, the main standards of solid biofuel in the world are introduced. The specifications of solid biofuel from different countries are compared each other. According to the present situation of China solid biofuel industry and standardization, it is suggested that solid biofuel standards and service system should be established and perfected in order to form full market and standard system including production of solid biofuel, burning appliance and customer service.
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    Discussion on Waste Water Treatment of Gum Rosin Processing
    KANG Chao-ping;CHEN Mei-juan
    2006, 40 (6):  34-36. 
    Abstract ( 807 )   PDF (623KB) ( 895 )   Save
    The research situation of waste water treatment of gum rosin processing at home and abroad was generally summarized. The source and characteristics of gum rosin waste water were systematically analyzed. The successful ways and experiences in gum rosin waste water treatment were introduced. The experiences and base for the waste water treatment in rosin industry were provided by analyzing the monitoring data from the production process.
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    Analysis of Compounds in Hexane Extractives of Sawara Falsecypress Heartwood
    LIU Zhi-ming;NIU Jing;WANG Xiang-ming;FANG Gui-zhen;GUO Yuan-ru
    2006, 40 (6):  25-28. 
    Abstract ( 747 )   PDF (714KB) ( 776 )   Save
    The chemical components of Sawara Falsecypress (Chamaecyparis pisifera) heartwood and its hexane extractives were studied by basic chemical composotion analysis and GC-MS analysis,and 16 compounds in hexane extractives were identified. The major compounds in hexane extractives were terpene and naphthalene derivatives. Among 16 compounds, the compound at the hightest content (22.396%) is 1,2,3,4,4a,5,6,8a-octahydro-7-methyl-4-methylene-1-(1-methylethyl)-,(1.α,4a.α,8a.α)-naphthalene.
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    Influence of Nitric Acid Modification on the Properties of Activated Carbon
    HUANG Wei;SUN Sheng-kai;LI Yu-jie;YANG Ai-jun;JIA Yan-qiu
    2006, 40 (6):  17-21. 
    Abstract ( 793 )   PDF (1313KB) ( 1443 )   Save
    The influence of nitric acid modification on the ash, pH, surface element content and structure of the activated carbon was studied. The result indicates that the nitric acid modification of activated carbon can reduce the ash content, pH, specific surface area of the activated carbon,but increase the surface oxygen content of activated carbon.
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    GC-MS Analysis of the Chemical Constituents of Natural Pyrethrum Extracted by Supercritical CO2
    ZHENG Jian-zhen;LIU Wen-han;WU Xiao-qiong;LIN Zhen-xing
    2006, 40 (6):  22-24. 
    Abstract ( 778 )   PDF (524KB) ( 788 )   Save
    GC-MS was used to analyse pyrethrum extracted by supercritical CO2 . Area normalization was used to deter mine relative percentage content of the compounds. As a result, 53 compounds were separated and 31 compounds were identified, the identified compounds accounted for more than 58.5% of the total compounds, it is indicated that the pyrethrum contains alkane, olefinic alcohol, olefine acid, sterol, fatty acid and pyrethrins. The relative percentage content of pyrethrins is 50.70%.
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    The Study on the Content of Flavonoids and the Chemical Composition of Lipids in Seeds of Ginkgo Biloba L.
    CHEN Wen-ying;WANG Cheng-zhang;GAO Cai-xia;ZHANG Si-fang;ZHENG Guang-yao
    2006, 40 (6):  6-8. 
    Abstract ( 577 )   PDF (509KB) ( 851 )   Save
    The contents of lipids and flavonoids in different seeds of Ginkgo biloba L. from Taixing were studied.The results showed that:Dongtaiguo contains 7.58% of lipids,Bianfuzi and Dafuzi contain both 4.32% of lipids; Unsaturated oleic acid and linoleic acid were over 65% in fatty acid of lipids.The main composition of lipids were: hexadecenoic acid 2.342%; hexadecanoic acid 7.915%; 7,10-octadecadienoic acid 2.446%;8,11-octadecadienoic acid 31.136%; oleic acid(9,11-C18:1) 32.873%; stearic acid 1.589%. Dafuzi contains 0.150% of flavonoids; Bianfuzi contains 0.127% of flavonoids. Therefore,there is a nice application foreground in medicine and food development from seeds of Ginkgo biloba L..
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    Research Progress of Biodiesel Stability and Biodiesel Stabilizers
    BI Liang-wu;ZHAO Zhen-dong;LI Dong-mei;GU Yan;WANG Jing;BO Cai-ying
    2006, 40 (6):  43-47. 
    Abstract ( 690 )   PDF (829KB) ( 1204 )   Save
    Research progress of biodiesel stability and biodiesel stabilizers at home and abroad was reviewed in this paper, including chemical composition and characteristics of biodiesel, stability and its influence factors of biodiesel, deter mination and evaluation methods of biodiesel stability, varieties and properties of biodiesel stabilizers. It is thought that the addition of biodiesel stabilizers was the main way to raise the stability of biodiesel.
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    Progress of Exploitation and Utilization on Energy Plant
    SONG Yong-fang
    2006, 40 (6):  51-53. 
    Abstract ( 692 )   PDF (567KB) ( 1052 )   Save
    Biomass energy is an important renewable energy. In the paper, exploitation and utilization situation of energy plant in the world is introducted. The trees species and seeds oil content as energy plant in China are also summarized.
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    Preliminary Study on Dissolubility of Microcrystalline Cellulose in the Imidazolium Ionic Liquid
    GUO Ming;YU Zhe-liang;LI Ming-hui;WANG Chun-peng;CHU Fu-xiang
    2006, 40 (6):  9-12. 
    Abstract ( 675 )   PDF (725KB) ( 951 )   Save
    A new ionic liquid Cl2 was synthesized. The solubility property of microcrystalline cellulose in this ionic liquid was preli minarily studied. The influence of different factors on its solubility was investigated by orthogonal test. The optimal conditions were:15% NaOH solution for cellulose activation, 80℃ for dissolving cellulose, 60 min of dissolving time, and anhydrous condition of the ionic liquid for the test. The results show that the ionic liquid has a certain ability to dissolve microcrystalline cellulose. The dissolution mechanism was also prelimnarily discussed.
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    Study on Preparation and Characteristic Constituents of Turpentine Reference Materials
    GU Yan;BI Liang-wu;ZHAO Zhen-dong;LI Dong-mei;WANG Jing
    2006, 40 (6):  1-5. 
    Abstract ( 770 )   PDF (1413KB) ( 983 )   Save
    The preparation processes of turpentine from masson pine, slash pine, and simao pine were studied comparatively with solvent and steam distillation methods. The characteristic properties of three kinds of turpentine prepared by steam distillation method had all met the super grade requirements of China national standard——GB/T 12901-2006 "Gum turpentine". The analytical results of GC and GC-MS showed that the chemical characteristic compositions of three kinds of turpentine are separately α-pinene, β-pinene, linmonene, β-phyllendrene, longifolene and β-carryophylene, etc. The obvious difference would be related to the relative content ratios of α-pinene and β-pinene, which are 8.5 (masson pine turpentine), 2.0 (slash pine turpentine), and 4.0 (Simao pine turpentine), respectively. The characteristic parameter difference of relative content ratio of α-pinene to β-pinene would be used as an important evidence for the identification of pine species.
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    Study on Extraction and Characterization of Red Pigment from Cinnamomum camphora (Linn.) Presl Fruits
    JIANG Yi-hua;JIANG Xin-long
    2006, 40 (6):  29-33. 
    Abstract ( 761 )   PDF (905KB) ( 985 )   Save
    Extraction conditions and physic-chemical properties of red pigment in fruits of Cinnamomum camphora (Linn.) P. were investigated. Results showed that 20% ethanol solution of pH 1 was the optimal extractant for the red pigment from Cinnamomum camphora (Linn.) P.The Cinnamomum camphora (Linn.) P. red pigment is classified to anthocyanins, and it can be dissolved in water and acidic ethanol,for which pH had the significant effect on the color and lustre of pigment. The pigment is stable and has good heat resistance to acid environment. Under sunlight, degradation of the pigment could be accelerated. Metallic ions such as Na+,Ca2+,Zn2+,Cu2+,Al3+ had no effect on the color and lustre of pigment, but Fe3+,Pb2+ had bad effect. The pigment had worse anti-oxidation ability and better anti-reduction ability. The addition of glucose, sucrose,and salts had no effect on the pigment.
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    Research Progress on the Steam Explosion Pretreatment of the Lignocellulose and Its Bioconversion
    WANG Kun;JIANG Jian-xin;SONG Xian-liang
    2006, 40 (6):  37-42. 
    Abstract ( 766 )   PDF (1072KB) ( 1184 )   Save
    Lignocellulose resources can be used to produce ethanol, but its structure and chemical composition hamper the accessibility of cellulose enzyme, so it is necessary to pretreat the raw materials effectively. Among many pretreatments, steam explosion, because of its low-cost, less energy consumption and pollution-free has favored researchers. Through the research on procession, mechanisms and influencing factors, and the application of bioconversion, proving powerful the wonderful future it has, it will be one of key technologies in the fuel-ethanol industry, which takes lignocellose as its resource.
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