Welcome to Biomass Chemical Engineering,

Table of Content

    30 March 2009, Volume 43 Issue 2 Previous Issue    Next Issue
    Study on Synthesis and Structure Identification of Terpenyl Gallates
    BO Cai-ying;BI Liang-wu;ZHAO Zhen-dong;LI Dong-mei;GU Yan;WANG Jing;ZHANG Qiu-ge;WANG Yu-min;ZHOU Yong-hong
    2009, 43 (2):  1-5. 
    Abstract ( 706 )   PDF (1164KB) ( 1682 )   Save
    A synthetic route of terpenyl gallates was advanced. Gallic acid was acetylated to form 3,4,5-triacetoxybenzoic acid at first, 3,4,5-triacetoxybenzoic acid was esterified with six terpenyl alcohols such as farnesol, geraniol, linalool, nerolidol, menthol, and hydroabietyl alcohol by N,N'-dicyclohexyl carbodiimide (DCC) with the assistance of ultrasound at room temperature to produce terpenyl 3,4,5-triacetoxybenzates, respectively. The terpenyl 3,4,5-triacetoxybenzates were then deacetylated by hydrazine hydrate to produce corresponding terpenyl gallates. The total yield of farnesyl gallate, geranyl gallate, linalyl gallate, nerolidyl gallate, menthyl gallate, and hydroabietyl gallate were 86.17%, 85.26%, 76.32%, 87.50%, 79.22% and 82.54%, respectively. The synthetic method had advantages of low reaction temperature, short reaction time, and high conversion rate. The chemical structures of above six terpenyl gallates were identified at last.
    Related Articles | Metrics
    Structure-analysis of Isomerized Products of Comus wilsoniana Fruit Oil
    NIE Xiao-an;XIA Jian-ling;CHANG Xia
    2009, 43 (2):  11-14. 
    Abstract ( 737 )   PDF (983KB) ( 1372 )   Save
    The isomerization of Comus wilsoniana fruit oil by the catalysts such as I2, RuCI3 and alkaline were studied. The mechanism of isolated double bonds to conjugated double bonds was discussed. The constituents of isomerized products were also analyzed by the methods of UV, GC, GC-IR, GC-MS.It has been found that the catalysts had the most important effect on the configuration of isomerized products.The conjugated configurations by the alkaline catalyst were cis-trans, and the conjugated configurations were both cis-trans and trans-trans by I2 and RuCl3, meanwhile the proportion of both configurations was 1:1.
    Related Articles | Metrics
    Study on the Adsorption of Lignin Derivatives for Three Proteinases
    LIN Yin;FANG Run;CHENG Xian-su;
    2009, 43 (2):  6-10. 
    Abstract ( 637 )   PDF (995KB) ( 1025 )   Save
    The new polymers such as phenol and aminophenol derivatives of HBS lignin were prepared by chemical modification of HBS lignin and enzymatic hydrolysis lignin to increase the hydrophilicity of lighin. The adsorption of lignin derivatives for three proteinases (panain, trypsin and pepsin were) investigated. The results showed that the lignin derivatives were able to adsorb three proteinases. The adsorption abilities of aminophenol and phenol derivatives of HBS lignin were better than that of HBS lignin. These enzymes still kept higher activity after being adsorpted. The lignin and its derivatives could be used as new adsorbents for enzyme concentration or new carriers for enzyme immobilization.
    Related Articles | Metrics
    The Research of Miscibility of Micro/Nano-crystal Cellulose and Polysulphone Blend System
    TANG Huan-wei;ZHANG Li-ping;LIN Xing
    2009, 43 (2):  15-18. 
    Abstract ( 728 )   PDF (1594KB) ( 1095 )   Save
    The miscibility of micro/nano-crystal cellulose/polysulphone blend system was studied by determination of absolute viscosity, and analysis of phase separation structure and coagulation properties of blend system, as well as determination of water flux and rejection ratio of the composite membrane. Under different temperatures of coagulation bath, the structure of membrane was examined by SEM. These results indicated that at a certain proportion scale micro/nano-crystal cellulose were equably dispersed in PSF casting solution. The blend system was semimiscible with a nonlinear viscosity curve. Under the condition of 18% polysulphone, PVP K30 as additive in 0.3% mass fraction, 10 s evaporation time, 5.4% micro/nano-crystal cellulose the pure water flux of the composite membrane could reach 235.27 L/(m2·h) and the rejection ratio was 95.35%.The gradient of membrane poles became better, with the increasing of temperature of coagulation bath.
    Related Articles | Metrics
    Study on the Extraction Technology of Total Flavonoids from the Leaves of Dendrocalamus latiflorus Munro
    MA Xie;YANG Hu;HUA Gao-min;YANG Guo;TANG Xiu-hua
    2009, 43 (2):  19-22. 
    Abstract ( 665 )   PDF (1026KB) ( 1026 )   Save
    The extraction technology of total flavonoids from the leaves of Dendrocalamous latiflorus Munro was studied. The results showed that extraction time, extraction temperature, liquid-solid ratio and stirring rate had significant effect on yield. The optimal conditions were as follows:60%(volume fraction)ethanol,80℃ temperature, 25:1(mL:g) liquid-solid ratio,300 r/min stirring rate. After two times extraction and 2 h each time, the yield of total flavonoids was 1.06%.
    Related Articles | Metrics
    Study on Preparation of Benzoic Acid by Catalytic Oxidation of Benzaldehyde
    XIE Shui-long;XIAO Jian;LIU Xian-zhang;
    2009, 43 (2):  23-26. 
    Abstract ( 1163 )   PDF (801KB) ( 2294 )   Save
    Benzoic acid was prepared by catalytic oxidation of benzaldyde with oxygen in the presence of cobalt chloride hexahydrate. The effects of the reaction temperature, dosage of solvent, catalyst and emulsifier on the yield of benzoic acid were studied. The yield was over 85% at the condition of mass ratio of benzaldehyde, water, emulsifier, and cobalt hexahydrate 75:50:37.5:0.075,reaction temperature 75-80℃, reaction time 6h, oxygen flow rate 0.3 L/min. The yield of benzoic acid was 60%-65% after twice recrystallization with water.
    Related Articles | Metrics
    Enhancement of Bran to Cellulase Production by Trichoderma reesei Rut C-30
    AI Bin-ling;WANG Yi-qiang;CHEN Jie-nan
    2009, 43 (2):  27-33. 
    Abstract ( 689 )   PDF (1557KB) ( 1288 )   Save
    The effect of bran content on cellulase production by Trichoderma reesei Rut C-30 was studied through adding bran in appropriate amounts and investigating suitable ratio of bran to microcrystalline cellulose by software of Design-Expert. The results showed that bran in appropriate amounts could accelerate the production of cellulase. The optimal conditions for cellulase production obtained by the design of rotation-regression-orthogonal combination were 12.23 g/L of microcrystalline cellulose and 23.50 g/L of bran.Filter paper activity and yield coefficient in 250 mL shake flask was 6.383 FPIU/mL and 521.913FPIU/g, respectively. Filter paper activity and yield coefficient in 7.5L fermentor was 6.807 FPIU/mL and 556.582 FPIU/g, respec-tively. Filter paper activity in shake flask and fermentor increased 14.247% and 17.403%, after optimization, respectively. Yield of cellulase decreased 6.584% and 4.005%, respectively. Filter paper activity were 1.953 FPIU/mL and 1.745 FPIU/mL, when replacing microcrystalline cellulose with dilute acid pretreated poplar and steam exploded poplar, respectively.
    Related Articles | Metrics
    Analysis of Active Substances of Several Kinds of Straw Vinegar
    ZHOU Jian-bin;ZHANG He-ling;YE Han-ling;DENG Cong-jing;ZHANG Qi-sheng
    2009, 43 (2):  34-36. 
    Abstract ( 770 )   PDF (800KB) ( 1240 )   Save
    In this study, straw was used to prepare straw vinegar, and the influence of carbonization temperature on the yield of vinegar was also discussed. The results showed that with the rise of carbonization temperature, the yield of vinegar shows a rising trend. In this study, compounds of straw vinegar were identified by GC/MS method. The results showed the straw vinegar is a mixture. The four straw vinegars averagely contained 24.41% phenolic compounds, 22.09% ketone compounds, 20.79% organic acids, 4.52% aldehyde compounds, 4.20% alcohol compounds and 2.44% ester compounds. This illuminates that straw vinegar has remarkable sterilization effects. The effective active compounds in straw vinegars such as acetic acid,propanoic acid,phenol, cresol, methoxyphenol, ethanol, etc. had the functions of bacteriostasis and sterilization.
    Related Articles | Metrics
    Research Progress of Physicochemical Properties and Pharmacological Activities of Plant Polyprenols
    WANG Cheng-zhang;YE Jian-zhong;CHEN Xi-juan;CHEN Hong-xia;YANG Lan
    2009, 43 (2):  37-42. 
    Abstract ( 727 )   PDF (1034KB) ( 2090 )   Save
    Plant polyprenols, which have similar structure and biological activity to dolichols in human body, are lipids of polymer with isoprenyl units. However, dolichols are key carriers in biosynthesis process of glycosyl derivatives with protein. The structure types, HPLC analysis, structural identification, spectral characteristics, pharmacology and clinical application of plant polyprenols were mainly introduced in this paper. According to present problems in processing of Ginkgo biloba L. leaves in China, it is suggested to mainly study the new bioactive components of polyprenols in G. biloba L. and promote the development of plant polyprenols from G. biloba L. as health care products and drug.
    Related Articles | Metrics
    Research Progress of Fuel Ethanol Production by Hydrolysis and Fermentation of Biomass
    ZENG Fan-zhou;JIANG Jian-chun;WEI Min;CHEN Yu-ru
    2009, 43 (2):  43-48. 
    Abstract ( 816 )   PDF (980KB) ( 2141 )   Save
    The production of fuel ethanol by fermentation of biomass materials which are abundant and diverse could alleviate the increasingly prominent problem of energy. The domestic and foreign development situation of the field, the process of fuel ethanol production by biomass hydrolysis and fermentation, as well as the analysis and prospect of the existing problems are reviewed. The hydrolysate detoxification, the microorganisms related to alcohol fermentation, strain breeding and several typical fermentation techniques are especially introduced. The typical microorganisms for ethanol production such as Saccharomyces cerevisiae, Pachysolen tannophilus, Pichia stipitis, Candida shechatae and Zymomonas mobilis are also introduced. The present problems are analysed and prospected.
    Related Articles | Metrics
    Application Research Progress of Microwave Technology on Deep Processing of Rosin
    LI Jian-fang;GAO Hong;SHANG Shi-bin
    2009, 43 (2):  49-53. 
    Abstract ( 538 )   PDF (950KB) ( 1024 )   Save
    The traditional deep processing technology of rosin has a lot of disadvantages, such as time consuming, energy consuming, serious pollution, low yield, difficult treatment and so on. Compared with the conventional method, microwave synthetic method not only is environmentally friendly but are also fast,simple and safe. In this paper, the recent applications of microwave technology on deep processing of rosin were summarized and the prospect of microwave technology on the processing of rosin was outlooked.
    Related Articles | Metrics
    Application and Development of Activated Carbon for Potable Water Treatment in China
    ZHANG Tian-jian
    2009, 43 (2):  54-60. 
    Abstract ( 651 )   PDF (880KB) ( 1026 )   Save
    Researches and applications of activated carbon for advanced water treatment of potable water in recent years in China such as ozone-activated carbon method and ozone-biological activated carbon method, as well as adsorption treatment of paroxysmal pollution of water source by activated carbon powder, were summarized. Some problems focused on advanced water treatment by activated carbon were also discussed.
    Related Articles | Metrics
    The Present Situation of Oleoresin Resources and Development Prospects of Its Production in Liaoning Province
    XU Bin;GAO Hong;LU Tian-ge;MENG Qing-zhou;DU Peng-fei
    2009, 43 (2):  61-63. 
    Abstract ( 656 )   PDF (804KB) ( 1216 )   Save
    By analysis of present situation of oleoresin resources in Liaoning province,the feasibility of oleoresin tapping was initially discussed,and some specific opinions on possible existing problems and countermeasures during oleoresin production were proposed.
    Related Articles | Metrics