Table of Content

30 January 2009, Volume 43 Issue 1 Previous Issue    Next Issue

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Study on Extraction Technology of Litsea cubeba Kernel Oil by Supercritical Carbon Dioxide CHEN Tie-bi;YUAN Xian-you;ZHANG Min 2009, 43 (1):  5-8.  Abstract ( 644 )   PDF (998KB) ( 1200 )   Save An isolation technology of Litsea cubeba kernel oil in a dynamic supercritical fluid extraction system was described. Factors influencing extraction yield were discussed. By orthogonal test, the optimum technological conditions were:extraction temperature 45 ℃, pressure 25 MPa, flow rate of carbon dioxide 220 L/h and extraction time 80 min. The yield of extraction was 84.5%. It is proved that adding the solvent and rinding shell may improve extraction rates of Litsea cubeba kernel oil. Related Articles | Metrics

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Preparation of Microcrystalline Cellulose-acrylate Composite Magnetic Microsphere CHEN Ri-qing;JIN Li-wei;DUAN Li-yan;WANG Chun-peng;CHU Fu-xiang 2009, 43 (1):  1-4.  Abstract ( 702 )   PDF (2380KB) ( 1143 )   Save Microcrystalline cellulose-acrylate composite magnetic microsphere was prepared with the aid of inverse suspension polymerization. The analysis of the interior structure and properties of microsphere indicated the avicel was covered inside the acrylic ester and Fe3O4 located in the pores of interior microsphere. Microcrystalline cellulose-acrylate composite magnetic microsphere was one kind of semi-hard-magnetic materials via magnetic analysis. Related Articles | Metrics

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Synthesis of HBS Lignin-pentaerythritol Modified Rosin Resins GAO Ren-jin;CHENG Xian-su;ZHENG Zuan-bin 2009, 43 (1):  9-12.  Abstract ( 519 )   PDF (970KB) ( 1364 )   Save HBS lignin-pentaerythritol modified rosin resins were successfully synthesized from rosin,pentaerythritol and HBS lignin. These resins were characterized by softening point, acid value, viscosity, DSC-TGA, and compared with rosin. The results showed that HBS lignin could partially subsititute pentaerythritol to modity rosin resin. The properties of rosin resin,such as softening point, acid value, viscosity, and heat resistance, were improved by HBS lignin-pentaerythritol modification. The results showed that the modification of HBS lignin has better effect on the properties of modified rosin than that of lignin sulfonate. Related Articles | Metrics

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Study on Antifeeding Activity of Ginkgo Phenol to Cabbage Caterpillar SHI Qi-tian;LIU Huan;LU Rong-cai;ZHANG Yu-zhen;GU Si;LIU Lin-yan; 2009, 43 (1):  13-16.  Abstract ( 677 )   PDF (912KB) ( 1184 )   Save The ginkgo exocarp extract containing 94.8% of ginkgo phenol was dissolved in CHCl3. A little amount of emulsifying agent alkylphenol ethoxylate was added to prepare a liquid containing 12.6% of ginkgo phenol.The liquid was diluted with 50,100,150,and 200 times of water.The leaves of Breassica chinensis Linn.were soaked with the diluted solutions to feed larvas of cabbage caterpillar at the ages of 3 and 4 years old.The antifeeding rate was up to 30.14%～85.30%.The diluted solution at 150 times has better effect of antifeeding to larva at 3 years old.The peak value of antifeeding was in the third day after treatment.The effect to 3 years lerva was better than that to 4 years larva.The antifeeding mechanism of ginkgo phenol to cabbage caterpillar was discussed. The antifeeding reasons of ginkgo phenol to cabbage caterpillar are that ginkgo phenol can inhibit synthesis of enzymes such as tyrosinase, and affect molting and growth of cabbage caterpillar.It shows antifeeding and developing to super-numerary larva.So most of them can not become pupas and then die. Related Articles | Metrics

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Study on Preparation of Tara Tannin by Polysulfone Membrane XU Hao;ZHANG Zong-he;ZHONG Chong-mao;QIN Qing;TAO Lin;WANG Guang-hui 2009, 43 (1):  17-19.  Abstract ( 521 )   PDF (906KB) ( 1119 )   Save Polysulfone membrane was used to treat the solution of tara tannin. The influencs of several factors such as the mole-cular weight cutoff, trans-membrane pressure, flow velocity, and temperature on membrane property and product quality were studied. The experimental results showed that, under the conditions of molecular weight cutoff of 10000, trans-membrane pressure of 0.2 MPa, flow velocity of 2.0 m/s, and temperature of 40-45℃, the tara tannin with turbidity≤0.5 NTU, and purity ≥85% was obtained. Related Articles | Metrics

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Preliminary Study on the Hydrolysis Process of Banana Peel NI Wei;CHANG Ya-ning;YU Jian-ying;OU Ling;LU Wen-ding;ZHOU Ying-qiu 2009, 43 (1):  20-24.  Abstract ( 820 )   PDF (1100KB) ( 1066 )   Save The hydrolysis process of banana peel was preliminarily studied. Two different ways such as hydrolysis by sulfuric acid and hydrolysis by enzyme were analyzed. The optimal reaction conditions were: hydrolysis by sulfuric acid at 110℃, 1% concentration and 2 h, the total reducing sugar yield was about 24%; hydrolysis by enzyme at pH value 4.8, 45℃, 4% substrate concentration and 1% enzyme concentration, for 24 h after 48 h soaking in 3% dilute ammonia, the total reducing sugar yield was about 19%. Related Articles | Metrics

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Study on Purification of Benzaldehyde XIAO Jian;XIE Shui-long;LIU Xian-zhang; 2009, 43 (1):  25-27.  Abstract ( 1756 )   PDF (981KB) ( 1402 )   Save The natural benzaldehyde could be prepared by hydrolysis of Chinese cinnamon oil, but a small amount of impurity in prepared nutural benzaldehyde was difficult to be removed by rectification process. The purification of benzaldehyde was studied by addition of benzaldhyde with sodium bisulfite. The effects of acid or alkali, reaction temperature, water amount and different operation conditions on the reaction were also discussed. The results showed that the purity of benzaldehyde was over 99.0% after hydrolysis of adduct by acidification or basification to remover the impurity and acidification for purification was slightly better than basification. Related Articles | Metrics

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Research Progress in Preparation of Chitosan Quaternary Salts and Their Application CAI Zhao-sheng;SONG Zhan-qian;YANG Chun-sheng;SHANG Shi-bin 2009, 43 (1):  28-31.  Abstract ( 885 )   PDF (914KB) ( 1764 )   Save Chitosan quaternary salts were the important derivatives of chitosan, they had extensive application in environmental protection, food manufacture, preparation of antimicrobial material and drug load and its controlled release. The basic types of chitosan quaternary salts, their manufacturing process and their application in the relative fields were summarized in this paper. The developing trend on the study of chitosan quaternary salts was also prospected. Related Articles | Metrics

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Research Progress of Cellulase Immobilization Carriers ZHANG Yu;XU Jing-liang;YUAN Zhen-hong;ZHUANG Xin-shu;LI Dong; 2009, 43 (1):  32-35.  Abstract ( 800 )   PDF (919KB) ( 1055 )   Save Research progress of immobilized cellulases with soluble, insoluble and souble-insoluble carriers was mainly introduced. Cellulase immobilized on soluble carriers can hydrolyze insoluble cellulose effectively, but cellulase can't be recycled expediently. Cellulase immobilized on insoluble carriers could be recycled expediently, but most of them can't hydrolyze insoluble cellulose because of poor contact. Even immobilized on magnetic nanoparticles and membranes, it could only hydrolyze soluble CMC and not hydrolyze insoluble cellulose efficiently. Immobilized cellulase on soluble-insoluble(S-IS) carriers can hydrolyze insoluble cellulose, and be recycled expediently, but cellulase is difficult to be combined on S-IS firmly and the activity and amount loss of the immobilized cellulase is significant during precipitation-dissolution process. It is expected to develop new S-IS and immobilization method. Related Articles | Metrics

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Research Progress on Synthetic Methods of Ployhydroxybenzophenones WANG Guang-hui;XU Hao;HUANG Jia-ling;ZHONG Chong-mao;CHANG Lian-ju 2009, 43 (1):  36-40.  Abstract ( 595 )   PDF (975KB) ( 1447 )   Save In this paper, the recent research progresses in polyhydroxybenzophenones were reviewed. The different synthesis methods of polyhydroxybenzophenones, mainly the synthesis of 2,4-dihydroxybenzophenone by condensation reaction of benzoyl chloride, benzoic acid and trichlorotoluene with resorcinol, as well as other related synthesis methods of polyhydroxybenzophenones were introduced and compared in detail.It was suggested that exploitation of synthesis method with high efficiency, energy conservation, low-cost and environmental protection is the development trend at home and abroad in the future. Related Articles | Metrics

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Research Progress of Cellulose/Chitin Blends CHEN Chao-jian;WANG Rong-rong;ZHANG Wei;FU Shi-shen 2009, 43 (1):  41-44.  Abstract ( 794 )   PDF (903KB) ( 1357 )   Save As two of the most abundant natural macromolecular compounds in the world, cellulose and chitin are renewable and have extensive sources. Just like most natural polymers, they are non-toxic, biodegradable and have good biocompatibility. Novel functional materials with properties of two components such as membrane, fiber and adsorption beads, prepared by blending with cellulose and chitin show a greatly application prospect.Research progress of cellulose/chitin blends in recent years is reviewed in this paper. Related Articles | Metrics

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Research Progress in Treatment of VOCs and Application of Activated Carbon LU Xin-cheng;JIANG Jian-chun 2009, 43 (1):  45-51.  Abstract ( 738 )   PDF (1017KB) ( 2391 )   Save The sorts,sources,present situation of pollution,and harmfulness of VOCs were introduced based on the concept of VOCs.The basic methods to treat VOCs,such as adsorption technology,condensation technology,membrane-based technology,combustion technology,biological purification technology,etc. were described. At the same time,the applications of activated carbon to treat VOCs as absorbent and photocatalytic carrier were discussed.The urgent problems and development trends of VOCs treatment by activated carbon were proposed. Related Articles | Metrics

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Research Progress in the Catalyst for Synthesis of Citric Acid Esters LI Jing;JIANG Jian-chun;XU Jun-ming 2009, 43 (1):  52-56.  Abstract ( 604 )   PDF (903KB) ( 1229 )   Save Recent researches on synthesis and application of citric acid esters were introduced. The catalysts, such as sulfonic acid, solid superacid, teropolyacid and inorganic salt for the synthesis of citric acid esters were summarized. The advantages and shortcomings of these catalysts were analyzed and compared. Several technologies such as crosslink, nanotechnology, magnetization and microwave radiation on the modification of the catalyst were introduced. The development prospect of synthesis of citric acid esters was also pointed. Related Articles | Metrics

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The Harms,Prevention and Comprehensive Utilization of Eupatorium adenophorum LI Xue-yao;YING Hao 2009, 43 (1):  57-60.  Abstract ( 682 )   PDF (912KB) ( 1584 )   Save The harms, prevention and comprehensive utilization of Eupatorium adenophorum are described in this article. As an invasive species, E. adenophorum loots others' living space and has done great harms to the balance and development of the nature. E. adenophorum's special Chinese medical herbal smell can make animals and people faint and make animals have an allergy and refuse food. Using it as washers, animals' hoofs would be rotted. Because of the unique characteristics of E. adenophorum, it has great uses in many fields, mainly including the agricultural and industrial uses. The research and development of the potential value of E. adenophorum have attracted people's attention. Related Articles | Metrics