Table of Content

30 September 2001, Volume 21 Issue 3 Previous Issue    Next Issue

研究报告

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STUDY ON PREPARATION OF MODIFIED EDIBLE MICROCRYSTALLINE CELLULOSE POWDER BY SPRAY DRYING HUANG Li-xin;HAN Lei;WANG Zong-lian;HOU Yong-fa 2001, 21 (3):  1-5.  Abstract ( 604 )   PDF (656KB) ( 912 )   Save Modified edible microcrystalline cellulose solution was spray dried by pneumatic nozzle and rotary disk atomization. The characteristics of spray drying were studied,and optimized technological operation conditions were obtained in industrialized scale. For obtaining the fine powder less than 300 mesh, the optimized spray drying technological parameters were also obtained. Related Articles | Metrics

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SYNTHESIS,STRUCTURAL ELUCIDATION OF IMIDES FROM TURPENTINE AND THEIR INSECTICIDAL SYNERGISM ZHOU Yong-hong;XIE Hui;SONG Zhan-qian 2001, 21 (3):  6-10.  Abstract ( 612 )   PDF (684KB) ( 950 )   Save 13 imides were synthesized from turpentine,a cheap and abundant natural resource.Their structure were confirmed through IR, 1H NMR and elemental analysis.The synergistic tests show that imides from turpentine have synergism toward pyrethroid and their synergistic effect is related to the substituting group over N atom. Related Articles | Metrics

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ISOMERIZATION OF α-PINENE CATALYZED BY PHOSPHOTUNGSTIC ACID SUPPORTED ON ACTIVATED CARBON ZHANG Min;YIN Du-lin 2001, 21 (3):  11-15.  Abstract ( 568 )   PDF (749KB) ( 1029 )   Save Isomerization of α-pinene was studied over phosphotungstic acid and activated carbon supported phosphotungstic acid catalysts.Influences of the reaction condition on conversion and selectivity of products were investigated.The experimental results show that solvents and temperature have obvious influence on activity of the catalyst and that HPW catalyst has both high catalytic activity and selectivity even at lower temperature to produce the expected camphene and limonene isomers.After being supported on activated carbon, the catalytic activity and stability of phosphotungstic acid have been improved greatlty and the catalyst can be reused. Related Articles | Metrics

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STUDY ON TECHNOLOGY OF CATALYTIC GASIFICATION OF BIOMASS IN FLUIDIZED-BED GASIFIER ZHANG Jin-ping;JIANG Jian-chun;JIN Chun;YING Hao;DAI Wei-di;LIU Shi-cai 2001, 21 (3):  16-20.  Abstract ( 551 )   PDF (689KB) ( 1087 )   Save In this paper, the feasibility and safety of the fluidized-bed gasifier used for biomass gasification were studied. The technological process of sawdust gasification was investigated in oxygen-enriched air. Effects of catalysts on gasifying process and tar cracking were explored and optimized range of technological parameters were obtained.The max imum heat value of gas is as high as 9.93 MJ/Nm3. Related Articles | Metrics

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STUDY ON CHEMICAL COMPOSITIONS AND PHYSICAL-CHEMICAL PROPERTIES OF METASEQUIA GLYTOSTROBOIDES GUM LU Jun 2001, 21 (3):  21-24.  Abstract ( 710 )   PDF (449KB) ( 692 )   Save Chemical composition and physical chemical properties of Metasequia glyptostroboides gum were studied in this paper. M. glyptostroboides gum were cream colored,transparent and amorphous.Its softening point and unsaponifiable content were higher and saponification number were lower than those of Pinus massoniana rosin.The two samples contain similar kinds of rosin acids with certain difference in their contents. Related Articles | Metrics

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STUDY ON HIGH ABRASION-RESISTANT PAPER ZHOU Xiao-fan;WANG Hui-li;DING Pei;PI Cheng-zhong 2001, 21 (3):  25-28.  Abstract ( 579 )   PDF (547KB) ( 916 )   Save Study on coated tissue paper was carried out to investigate the effect of coating weight,kinds of binder on abrasion resistance,water receptivity and wet tensile strength.With optimized coating formulation,papers with abrasion cycles up to 7 000 have been prepared. Related Articles | Metrics

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STUDY ON CHEMICAL CONSTITUENTS OF OLEORESIN FROM PINUS ELLIOTTII IN GUANGXI ZHONG Guo-hua;LIANG Zhong-yun;SHEN Mei-ying;HE Zheng-hong;LIU Hong;WEN Cai-lin 2001, 21 (3):  29-33.  Abstract ( 667 )   PDF (785KB) ( 1067 )   Save Chemical constituents of oleoresin from P. elliottii in Guangxi are analyzed with GC.The climatical,geographical and environmental factors,which cause variation of chemical constituents of oleoresin from P. elliottii are discussed by a large amount of analytical data.Difference of chemical constituents between oleoresin from P. elliottii and P. massoniana is contrasted. Related Articles | Metrics

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EFFECTS OF THE CULTURAL CONDITIONS ON THE PROLI-FERATION OF BIFIDOBACTERIUM ADOLESCENTIS FROM XYLO-OLIGOSACCHARIDES XU Yong;YU Shi-yuan;JIANG Hua;YONG Qiang;YAO Chun-cai 2001, 21 (3):  34-38.  Abstract ( 772 )   PDF (530KB) ( 855 )   Save In this paper,the effects of pH value,reductive agent and sugar concentration on the anaerobic culture of B. adolescentis using xylo oligosaccharides as carbon source were examined.The study showed that xylo oligosaccharides were able to proliferate B. adolescentis in pH rang from 5.5 to 8.0,but the proliferation result was better in the culture condition of pH 8.0.By addition of L cysteine and sodium thioglycolic acid the initial oxidation reduction potential of the cultural medium could be lowered to proliferate Bifidobacterium rapidly.The optimum initial concentration of reductive agent was 0.5～1.0 g/L.Within 2.5～10 g/L,increase of initial concentration of xylo oligosaccharides enhances the concentration of Bifidobacterium and its proliferation rate.At the optimum initial sugar concentration of 5.0 g/L,the Bifidobacterium concentration reached 1.03 g/L and the sugar conversion ratio was 42.2% after 18 h. Related Articles | Metrics

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ANALYSIS OF RESIDUE OIL CONSTITUENTS FROM BORNEOL DISTILLATING PROCESS SONG Yong-fang;LUO Jia-liang 2001, 21 (3):  39-41.  Abstract ( 627 )   PDF (475KB) ( 1028 )   Save More than 37 components in the residue oil obtained from distillation of borneol from Sect.Camphora twigs and leaves were detected,among which 34 compounds were identified by GC/MS.The main of them are camphor(33.3%), d-borneol(31.3%),γ-muurolene(3.73%),α-pinene(5.5%),β-pinene(4.4%),1,8-cineole (1.48%), α-guaiene(1.18%),α-terpineol(1.65%),α-copaene(1.3%) and (+)-aromadendrene(2.1%). Related Articles | Metrics

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RESEARCH ON PRINCIPLE OF SYNTHESIZING CURING AGENT FOR AUTOMOBILE COATINGS FROM COTTONSEED OIL AND ITS WASTE MATERIALS NIE Xiao-an 2001, 21 (3):  42-46.  Abstract ( 676 )   PDF (592KB) ( 748 )   Save After esterization,isomerization,polymerization and amidation of cottonseed oil and its waste materials,the curing agents of automobile coatings were synthesized.The polymerization principle was discussed,and the application research work was carried out.It was shown that polyamide from cottonseed oil was suitable as curing agent for automobile coatings,and had been found wide application. Related Articles | Metrics

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SEPARATION OF SAPONINS FROM BULBS OF LILIUM BROWNII VAR. COLCHESTERI AND THEIR IDENTIFICATION JI Hong-wu;DING Xiao-lin 2001, 21 (3):  47-51.  Abstract ( 594 )   PDF (769KB) ( 1054 )   Save The ethanol extract from bulbs of Lilium brownii var. colchesteri was separated and purified by combination of liquid liquid extraction, AB-8 porous resin absorption,step sedimentation with ether acetone and HPLC preparation. Two steroidal saponins are screened by ESI-MS and their structures are identified by spectroscopic means. Related Articles | Metrics

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STUDY ON CHEMICAL COMPONENTS AND RESISTANCE MECHANISM TO PINE WOOD NEMATODE OF MASSON PINE PROVENANCE(Ⅲ)——Study on contents variation of neutral terpenoids of resistant provenance of P. massoniana after inoculating Bursaphelenchus xylophilus ZHAO Zhen-dong;HU Xi-e;LI Dong-mei;XU Fu-yuan;HU Gui-xian;SUN Zhen;LIU Xian-zhang 2001, 21 (3):  52-58.  Abstract ( 677 )   PDF (1379KB) ( 1047 )   Save The variation relationships of neutral terpenoids (mainly sesquiterpenoids) were investigated through GC determination of the different resistant provenances (high resistance: H, middle resistance: M and low resistance: L) of Pinus massoniana after they were inoculated with Bursaphelenchus xylophilus (pinewood nematodes, PWN). The results showed that the inoculation led to increase of some components such as longifolene with the inoculated days in the H and M provenances, but led to decrease of some compounds such as trans-caryophyllene in all three provenances. The inoculation of PWN into the H provenance resulted in the decrease followed by the increase of the ratio of contents of longifolene and trans caryophyllene. However,the inoculation did not finally change the resistance of masson pine provenance, and the growth did not affect the resistance, too. Related Articles | Metrics

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SYNTHESIS OF FATTY ACID DIETHANOL AMIDE FROM CAMPHOR TREE SEED OIL CHEN Jin-fang;WANG He Xiang;WANG Jun-quan;NI Xiao-feng 2001, 21 (3):  59-62.  Abstract ( 690 )   PDF (492KB) ( 1017 )   Save This article deals with a new method for preparing fatty acid diethanol amide by reacting camphor tree seed oil with diethanolamine.The product was obtained with a purity of fatty diethanol amide>94% and fatty methyl ester<0.5% by FTIR quantitative analysis. HLB value of the product is 12.22. Related Articles | Metrics

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STUDY ON TUNG OIL BASED ALKYD RESIN MODIFIED BY STYRENE QU Jin-qing;CHEN Huan-qin 2001, 21 (3):  63-68.  Abstract ( 693 )   PDF (747KB) ( 1370 )   Save Tung oil based alkyd resins modified by styrene were synthesized from tung oil alkyd copolymerized with styrene. Effects of tung oil content and amount of styrene on the properties of modified alkyd were discussed. Molecular weigh,properties and FTIR spectra of modified alkyds were studied.The results showed that modified alkyd resin paints possess good properties such as fast drying, high hardness and excellent water resistance. Related Articles | Metrics

综述评论

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ADVANCES IN THE STUDIES ON STRUCTURE OF CATALYTIC ACTIVE SITE AND CHARACTERISTICS OF LACCASE HU Ping-ping;FU Shi-yu 2001, 21 (3):  69-75.  Abstract ( 794 )   PDF (669KB) ( 1709 )   Save In nature, laccases play an important role in degrading lignin. However,the abilities to degrading lignin by different laccases vary widely, which depend on the structure of laccases, especially the structure of the tri nuclear copper site. This text summarizes the studies on the structure of the active site and the characteristics of laccases in the past ten years. Related Articles | Metrics

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ANALYSES ON CAUSE OF ROSIN CRYSTALLIZATION SONG Sheng-mei;WANG Ya-ming;XIE Hui-ding 2001, 21 (3):  77-82.  Abstract ( 658 )   PDF (656KB) ( 744 )   Save In this essay,a lot of literatures were referred to summarize the factors affecting rosin crystallization such as pine tree species,compositions of rosin,processes of production,package and storage.Some methods to prevent rosin crystallization were proposed. Related Articles | Metrics

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GREEN CHEMISTRY & GREEN SEPARATION ENGINEERING SHEN Shao-chuan;YAO Ke-jian 2001, 21 (3):  83-86.  Abstract ( 607 )   PDF (590KB) ( 846 )   Save With the increasing request for better living environments,people pay great attention to green chemistry,a method of environmentally benign technology.Studies on green chemistry are now more and more prosperous.In this paper,the advances in green chemistry are reviewed.The notion of green separation engineering is first presented. Also,the methods of greening separation are discussed. Related Articles | Metrics

研究快报

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STUDY ON EXTRACTING CITRAL FROM LITSEA CUBEBA FRUITS BY MICROWAVE RADIATION AND DETERMINATION OF CITRAL LIU Xiao-geng;CHEN Mei-mei;CHEN Xue-heng;XIE Bao-ping 2001, 21 (3):  87-90.  Abstract ( 657 )   PDF (433KB) ( 848 )   Save Citral is extracted from Litsea cubeba with microwave radiation.Content of essential oil extracted from L.cubeba fruit using microwave radiation is on an average 2.48% higher than that using traditional direct steam distillation.Adopting gas chromatography with temperature programming,citral content in the oil was determined to be 68.46%,at recovery 101.3%,relative standard deviation 0.28%, linear relative coefficient 0.9997,which are in good agreement with those measured by internal standard method,but the operation is simpler than both the internal standard and GB 11424-89 methods. Related Articles | Metrics