Table of Content

30 October 2012, Volume 32 Issue 5 Previous Issue    Next Issue

1研究报告

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Allelopathic Effects of Polyprenols from Ginkgo biloba L. Leaves on Growth of Wheat Seedlings and Seed Germination CHEN Hong-xia;WANG Cheng-zhang;SUN Yan 2012, 32 (5):  7-10.  Abstract ( 784 )   PDF (1046KB) ( 842 )   Save Effects of polyprenols from Ginkgo biloba L. leaves with different concentrations on wheat seed germination and seedlings growth were studied. The results indicated that the low concentrations (20 and 50 mg/L) of polyprenols could enhance seed germination and seedling growth due to promotion of the activity of amylase and root. Its germination rate was 77.67%, the height was 14.36 cm, the length was 16.4 cm. The activity of amylase and root were 14.75 mg/(g·min) and 109.35 μg/(g·h), respectively. The high concentration (100 mg/L) of polyprenols had inhibition of seed germination and seedling growth. It reduced amylase activity and root activity. The activity of amylase and root were 9.82 mg/(g·min) and 21.12 μg/(g·h), respectively. Related Articles | Metrics

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Enhancement Mechanism of Wood-based Carbon Fiber Precursors during Curing by FT-IR Analysis MA Xiao-jun;LIU Xin-yan 2012, 32 (5):  19-23.  Abstract ( 695 )   PDF (1369KB) ( 775 )   Save Cross-linked reactions of wood-based carbon fiber precursors are performed using formalin as curing agent and hydrochloric acid as catalyst. The changes of chemical groups of precursors are investigated using FT-IR under the conditions of various hydrochloric acid concentration, curing time and heating rate. The enhancement mechanism of precursors during curing are analyzed. The results show that the intensities of absorption peaks at 1610-1510, 1455 and 900-650 cm-1 increase and then slowly reduce with increasing hydrochloric acid concentration and curing time. With the increase of heating rate, the bands at 3423 and 2925 cm-1 gradually weaken. The bands 1610-1510 and 1454 cm-1 decrease and then increase, and the bands at 1101 and 900-650 cm-1 visibly increase. The aromatic ring and the phenolic hydroxyl group of precursors react with +CH2OH in curing solution, and the dehydration condensation reaction occurs between the phenolic hydroxyl groups. This contributes to restrict three-dimensional network in the material and enhances the mechanical properties of the precursors. Related Articles | Metrics

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Microwave-assisted Synthesis of Hydrogenated Rosin-based Quaternary Ammonium Surfactant and Its Properties HUANG Zhi;WEI Xiao-jie;CHEN Xiao-peng;ZHENG Qiu-lan 2012, 32 (5):  41-45.  Abstract ( 758 )   PDF (1196KB) ( 726 )   Save Hydrogenated rosin-based quaternary ammonium surfactant was synthesized by means of microwave irradiation method using hydrogenated rosin, epichlorohydrin and triethylamine as raw materials. The effects of reaction conditions on esterification rate were investigated by single-factor experiment. The structure and surfactivity of synthesized product was then characterized. The results showed that the suitable synthesis reaction conditions of the titled compound were as follows: reaction time of 75 min, microwave power of 500 W, reaction temperature of 80 ℃ and molar ratio of 1∶1∶1. The esterification rate of 99.66 % with 82.24 % cationic surface active substance was obtained. The results of the surfactivity experiment showed that the critical micelle concentration (CMC) can be low to 9.83×10-4 mol/L, the surface tension is 35.7 mN/m and the emulsifying ability is 20 min. Foaming ability can reach 225 mm, foaming stability is 175 mm, Krafft point is less than 0 ℃ and HLB value is 20.9. The reaction time of microwave irradiation method can be shortened 105 min more than that by conventional heating method. Related Articles | Metrics

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Chemical Composition and Corrosion Resistance of the Essential Oil from Buried Wood of Hainan Cypress YAN Zong-da;LU Sheng-lou;GUO Fei-yan;YAN Jin;HE Guang-hong;WANG Bo-yun;ZHOU Zhan-sheng;ZHOU Zhi-bin;LIU Hong;YU Chang-jiang 2012, 32 (5):  111-114.  Abstract ( 781 )   PDF (1062KB) ( 1072 )   Save The chemical constituents of essential oil from buried wood of Hainan Cypress were separated and identified by GC-MS. Relative contents of essential oil were determined by peak area normalization. 39 compounds from the essential oil were separated and identified, which account for 91.843 % of total essential oil. The main chemical constituents and contents were cedrol (23.516 %), phthalalic acid (11.843 %), D-limonene (10.103 %), dibutyl phthalate(9.843 %) and phenol(5.324 %). The test of the corrosion resistance showed that Hainan Cypress had strong inhibitory on growth on Gloeophyllum trabeum Murr and Coriolus versicolor.(4.365 % and 4.58 % of weight loss of wood sample were determined in the base and middle of Cypress Gloomy wood respectively) Related Articles | Metrics

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Analysis of Different Volatile Constituents in the Wood Material by Headspace Solid Phase Microextraction-gas Chromatography-mass Spectrometry WANG Hui;ZENG Yi-cheng;HOU Ying;WENG Rui-jie;YANG Jing-jin;ZHU Yong;ZHOU Wen-zhong;YANG Yan 2012, 32 (5):  115-119.  Abstract ( 734 )   PDF (1036KB) ( 981 )   Save Headspace solid phase microextraction-gas chromatography/mass spectrometry was used to analyze volatile constituents in the oak chips, southwest birch chips, maple chips, pine chips and hemlock chips. The results showed that forty to fifty kinds of volatile constituents in five kinds of wood were detected. There were forty-nine kinds in oak chips, forty-five kinds in southwest birch chips, forty-seven kinds in maple chips, fifty kinds in pine chips and forty-seven kinds in hemlock chips.These data will provide a theoretical basis and technical support for their applications in production. In oak wood chips, the volatile constituents such as 5-methyl-2-furancarboxaldehyde, furfural, geranyl acetone,and β-ionone were the same as cigarette typical representative flavor components. The flavor components may contribute to the increase of stored tobacco flavor ingredients and enhance its sensory quality. Related Articles | Metrics

2综述评论

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Production of Pyrolytic Oils Using Microwave WU Shuang;WANG Xin 2012, 32 (5):  120-126.  Abstract ( 782 )   PDF (1110KB) ( 1652 )   Save The production of pyrolytic oils using microwave, including the mechanism,the influence of parameters, analysis of product distribution and pyrolysis reactors are reviewed. Their application and developing trend were pointed out. The researches in recent literatures are mainly concerned with the combination of the microwave and catalytic cracking processing. Some continuous microwave reactors, such as vacuum piston flow reactor and rotative microwave reactor, was developed and used instead of the bench microwave reactor. The overall understanding of the technologies using microwave in biomass pyrolysis reaction would provide a further industrial development in the field of biomass to liquid fuel. Related Articles | Metrics

1研究报告

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Selective Detoxification of Steam Explosion Pretreated Stream from Corn Stover with Anion Exchange Resin XU Yong;;JIANG Yin-shen;ZUO Zhi-feng;ZHANG Xing-xing;YONG Qiang;YU Shi-yuan; 2012, 32 (5):  11-18.  Abstract ( 775 )   PDF (1333KB) ( 930 )   Save The selective adsorption detoxification capacity (SADC) were experimentally compared among 4 anion exchange resin products respectively in the simulated solution (SS) by mixed sugars, organic acids, furan aldehydes and the steam explosion pretreated stream from corn stover (SES). A macroporous styrene series, i.e. weakly alkaline anion exchange resin D301, was then selected due to its better adsorbing priority to inhibitors of acids and furan aldehydes than sugars in SS and SES. Resin D301 could adsorb most inhibitors but little sugars in SS. For resin D301, acids adsorption was in agreement to Freundlish multilayer isothermal adsorption feature but sugars and furan aldehydes adsorption were in agreement with Langmuir monolayer isothermal adsorption feature. Resin D301 still showed its SADC in SES. It was different from SS in SES that the total inhibitors adsorption ratio decreased markedly by 36.6 % from 70.2 % to 44.5 %, but on the contrary, the monosaccharide adsorption ratio raised sharply by 20-31 times from 1.2 % to 25.5 %-37.9 %. The adsorption ratio of xylo-oligosaccharide and gluco-oligosaccharide reached 13.7 % and 10.6 % respectively because of unknown components interference. 69.1 % of acids, 94.4 % of furan aldehydes, 75.4 % of colored substances and 33.9 % of degraded lignin were removed together with 16.3 % of sugars in SES by the combined method of vacuum evaporation and resin D301 adsorption. Although the combined method for detoxification of SES showed a promising future in effectively improving the fermentability of SES, we still have to face the big gap from industrial production. It was noticed that the wider and deeper study is needed to develop the detoxification technology of pretreated lignocellulosic biomass. Related Articles | Metrics

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Active Oxygen-solid Base Pulping of Bagasse and Its Waste Liquor XIE Tu-jun;LIN Lu;PANG Chun-sheng;YANG Qiu-lin;SHI Jian-bin 2012, 32 (5):  46-50.  Abstract ( 708 )   PDF (1090KB) ( 726 )   Save Novel active oxygen and solid base method was used for bagasse cooking in this study to investigate the characteristics of pulp and waste liquor. The potential application of this kind of pulp in papermaking and the impact of the wastewater on environment were studied as well. The results indicated that the pulp yield is 44.74 %, the Kappa number is 21.82, the pulp visco-sity is 6.26 mPa·s and the whiteness is 34.21(ISO).While for the paper, the burst index , tensile index , tear index and folding strength were 2.18 mN·m2/g, 29.68 N·m/g, 9.16 mN·m2/g and 52 times, respectively. In addition, for the waste liquor, the pH value, CODcr, BOD5 and suspended solids of cooking waste liquor are 7.98, 4.165×104 mg/L, 1.2×104 mg/L and 6.18×104 mg/L, respectively. Related Articles | Metrics

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Investigation on Ultrasonic-assisted Extraction of Proanthocyanidins from Black Wattle Bark LI Tian-tian;WANG Fei 2012, 32 (5):  56-62.  Abstract ( 520 )   PDF (1555KB) ( 797 )   Save The optimal extraction conditions of ultrasonic-assisted extraction of proanthocyanidins from black wattle bark were studied. The response surface methodology (RSM) were employed for the optimization of extraction based on single factor tests. The Design Expert 8.0.4 software was adopted to built a second order quadratic equation. The result showed that the optimal extraction conditions were as follows: extraction temperature 50℃,extraction time 33.45 min, ultrasonic frequency 67 kHz, ratio of liquid to solid 11.04∶1. Under above conditions, the extraction yield of proanthocyanidins was up to 21.58 % which was very closely to 21.68 % of prediction value. Related Articles | Metrics

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The Changes of Physical and Chemical Properties of Lacquer Wax from Rhus vernicifera by Hydrogenation DONG Yan-he;WANG Cheng-zhang;HE Yuan-feng 2012, 32 (5):  63-68.  Abstract ( 643 )   PDF (1194KB) ( 639 )   Save In order to improve the quality of lacquer wax from the berry of Rhus vernicifera in China, the physical and chemical properties of lacquer berries, which origined from different cultuvars and regions, were analyzed. The property changes were investigated by hydrogenation and decoloration. The results showed the content of unsaturated fatty acids of R. vernicifera berry in China was higher than that of R. succedanea L berry in Japan. The physical property of refined lacquer wax was better than series refined production of Japanese Star Cherry by hydrogenation and decoloration. The melting point and hardness rised, acid value decreased from 66.4 to 13.7 mg/g, iodine value decreased from 151 mg/g to 90 mg/g, peroxide value decreased from 31.3 to 5.6 mmol/kg, however its whiteness increased from 25 to 85. The chemical property of refined lacquer wax was simialr to Japanese Star Cherry lacquer wax. The content of stearic acid increased from 7.38 % to 15.85%, however, oleic acid decreased from 13.66 % to 4.85 %. The total content of saturated fatty acids (C16∶0 and C18∶0) rised to over 90 %. The optimal conditions of hydrogenation were 0.2 % amount of 5.0 % palladium carbon, hydrogenation time 2-4 h, reaction temperature 100 ℃, reaction pressure 0.5 MPa, 200 r/min of stirring speed. The decoloration conditions were activated carbon and attapulgite in ratio of 1∶1 as decolorant, 0.5 % decolorant based on lacqurer wax, decolored time 30 min, temperature 80 ℃. Related Articles | Metrics

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Enzymatic Hydrolysis of Wheat Straw Pretreated by Green Liquor ZHAO Shi-ming;LU Qing-shan;CHU Qiu-lu;YU Shi-yuan 2012, 32 (5):  69-76.  Abstract ( 929 )   PDF (1214KB) ( 750 )   Save The wheat straw pretreated by green liquor was hydrolyzed under the exist of enzymes. The pulp yield, chemical composition and enzymatic hydrolysis yield under different green liquor pretreatment conditions were studied. The results indicated that the pulp with higher weight loss and delignification were obtained as more severe condition was applied in pretreatment, and the enzymatic hydrolysis yield was higher in the same enzymatic hydrolysis conditions. The proper pretreatment was conducted at 150℃ as the total alkali charge and sulfidity were 8 % and 40 % while pulp yield was 62.0 %, the content of glucan, xylan and lignin was 50.0 %, 18.9 % and 16.2 %, glucose yield and xylose yield was 74.2 % and 73.5%, repectively. The effects of mass concentration and enzyme dosage on wheat straw pretratment by green liquor were investigated. The enzyme system and addition amount of Tween-80 were optimized. The optimum enzymatic hydrolysis conditions of wheat straw by green liquor were 100 g/L mass concentration, 15 FPU/g cellulase dosages, 9 IU/g β-glucosidase, 30 IU/g xylanase and 0.05 g/g Tween-80. The glucose yield and xylose yield were 82.5 % and 77.8 % respectively under the optimum pretreatment conditions. They were 2.6 times and 1.6 times of those without treatment. Related Articles | Metrics

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Thermal Decomposition Mechanism and Kinetics of Lycorine Hydrochloride TIAN Chun-lian;XIAO Zhuo-bing 2012, 32 (5):  77-82.  Abstract ( 854 )   PDF (1233KB) ( 757 )   Save Thermal decomposing curves of lycorine hydrochloride were obtained in the nitrogen atmosphere by thermogravimetry and differential thermogravimetry techniques. Two thermal analysis kinetic methods of Achar and Coats-Redfern were used to speculate the probable mechanism of thermal decomposing reaction and the kinetic parameters. The shelflife of lycorine at room temperature was calculated by the kinetic parameters of the thermal decomposition. Before 233.9 ℃, one molecule of the crystalline powder had lost 1 molecule H2O and 1 molecule HCl. The most probable kinetic mechanisms of the second-stage and third-stage (α0.2-0.7) thermal decomposition were all chemical reactions. The corresponding mechanisms follow Reaction Order while the third-stage (α0.8-1.0) thermal decomposition was Nucleation and growth, corresponding with Avrami-Erofeev Equation. In accordance with the data of TG and Gaussian simulation, one molecule of the crystalline powder lost 1 molecule CO2 at the second-stage weightlessness and lost another 1 molecule CO2 and 1 molecule NH3 at α0.2-0.7 of the third stage while a molecule CH4 was lost at α0.8-1.0 of the third stage. The storage time of lycorine at room temperature was about 3 years. Related Articles | Metrics

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Kinetic Mechanism of Pyrolysis Reaction Using Poplar Particleboards as Raw Material HUANG Zhi-yi;FENG Yong-shun;YU Zhi-ming;MU Jun 2012, 32 (5):  83-87.  Abstract ( 690 )   PDF (1056KB) ( 927 )   Save The pyrolysis reactions of poplar particleboards were carried out using the thermogravimetric apparatus, The TG and DTG curves were used to analysis the pyrolysis mechanism by Coats-Redfern method. The results show that the non-isothermal pyrolysis of poplar particleboards can be generally divided into three stages:dehydration, fast pyrolysis and slow pyrolysis. As the heating rate increased, the maximum rate of weight loss were also increased. It was found that there was a lateral shift in the TGA curves to higher temperatures. The fast pyrolysis stage can be described by the model of D3.The activation energy is 107.24 kJ/mol, and the pre-exponpential factors of 5,10 and 20 ℃/min are 2.09×105 s, 6.57×105, 3.22×105 s-1, respectively. Related Articles | Metrics

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Preparation Technology of Paste Chlorophyll from the Bamboo Leaf JI Ping-xiong;LUO Yu-mei;XUE Wei-liang 2012, 32 (5):  88-92.  Abstract ( 715 )   PDF (1116KB) ( 711 )   Save The extraction technology of chlorophyll from bamboo leaf was studied through L9(34) orthogonal experiment based on single factor tests. The results indicated that the optimum chlorophyll extraction conditions were as follows: 80 % ethanol(volume fraction), ratio of liquid to solid as 25∶1.5(mL∶g) extraction for 3.5 h under 60 ℃. According to this extraction technology, the yield of chlorophyll was up to 0.49 %. The prepared paste chlorophyll was examined to reach the factory standard. Related Articles | Metrics

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Chemical Constituents of the Leaves of Melaleuca leucadendron Linn. FAN Chao-jun;CHEN Zhan-juan;BAO Chang-yu;BI He-ping 2012, 32 (5):  97-100.  Abstract ( 762 )   PDF (1030KB) ( 929 )   Save The compounds were isolated and purified by silica gel column chromatography from the leaves of Melaleuca leucadendron. Their chemical structures were elucidated on the basis of physicochemical properties and spectral data. Twelve compounds were isolated and identified as: genistein(1), betulinic acid (2), luteolin (3), rutin (4), citric acid (5), trans-cinnamaldehyde (6), trans-cinnamic acid (7), vanillin (8), vanillic acid (9), salicylic acid (10), benzoic acid (11), ursolic acid (12). Compounds 1, 3-11 was isolated from this plant for the first time. Related Articles | Metrics

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Recovery and Reuse of Tannin from Tannin-germanium Slag XU Hao;QIN Qing;QIAN Xing;ZHANG Zong-he;HUANG Jia-ling;CHEN Wen-wen;TAO Lin 2012, 32 (5):  93-96.  Abstract ( 779 )   PDF (1097KB) ( 1455 )   Save The disposing of the tannin-germanium slag, which was obtained during tannin-germanium precipitation process, was studied. The separation of tannin and germanium can be achieved by successively slurrying the tannin-germanium slag, complexation with oxalic acid and adjusting the pH value of the suspension to 8-9 with 10 % aqueous sodium hydroxide. The germanium salt is removed by centrifugal separation, and the aqueous tannin solution can be reused to extract germanium. The result shows that recovery rate of tannin can reach 50 %. Using 28 times of tannin as much as germanium, the recovery rate of germanium can be 98 %. Related Articles | Metrics

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Sub-critical Water Extraction of Polysaccharide from Processing Residues of Taxus cuspidate LI Shuang-ming;YU San-san;JIA Yan;XIE Xiao;JIA Chen;LI Wen-xiu 2012, 32 (5):  106-110.  Abstract ( 739 )   PDF (1074KB) ( 1024 )   Save The process of sub-critical water extraction of polysaccharide from processing residues of Taxus cuspidata was studied. The influences of ratio of different factors were investigated systematically. The optimal conditions were established as follows:ratio of material to liquid 1∶15, extraction temperature 150 ℃, extraction time 1 h, extracting once, ethanol concentration 90 %. Under above conditions, the extraction yield of polysaccharide was 3.03 %. In addition, the effect of sub-critical water extraction was compared with refluxing extraction and ultrasonic extraction. Results showed that sub-critical water extraction possess the highest yield, which was 2.31 times and 7.97 times of the yields by refluxing extraction and ultrasonic extraction, respectively. The structure of obtained polysaccharide was analyzed using infrared spectra. IR results showed that taxus polysaccharide was acidic polysaccharides with β-Pyranose configuration. Related Articles | Metrics

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Study on the Structure of Galacturonic Acid-dehydrogenation Polymer Complexs SUN Xue;XIE Yi-min;YANG Hai-tao;YAO Lan;SHI Chao-qun;YANG Wu-feng 2012, 32 (5):  24-28.  Abstract ( 727 )   PDF (1423KB) ( 992 )   Save Galacturonic acid-dehydrogenation polymer (DHP) complexes (GDHPC) were prepared from a pectin precursor of α-D-galacturonic acid and a lignin precursor of coniferin catalyzed by β-glucosidase, glucose oxidase, laccase and horseradish peroxidase. The FT-IR and 13C NMR spectra show that β-O-4, β-β, β-5 and β-1 structures are main substructures of DHP in the GDHPC. In addition, coniferyl alcohol/aldehyde substructures, vanillin units, and Ar-CαH2-substructures and etherified 5-5' units are also formed in the complexs. In the GDHPC, Cα of lignin substructure is also associated with α-D-galacturonic acid by ester bonds, acetal bonds and benzyl ether bonds. Related Articles | Metrics

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Mutation Breeding of Cellulase Producing Strain by Low Energy Ion Implantation ZHANG Ning;JIANG Jian-chun;YANG Jing;WEI Min;ZHAO Jian;TONG Ya-juan 2012, 32 (5):  29-33.  Abstract ( 762 )   PDF (1154KB) ( 807 )   Save Trichoderma reesei was used as experimental model, and the effects of low-energy N+ implantation on its survival rate, total antioxidant capability (T-AOC), protein concentration and cellulase yield were investigated. The results showed that the dose-survival rate curve took "double saddle shape" with increasing N+ implantation doses. It was different from the typical "saddle shape" curve of ion beam implantation. The curve of T-AOC and dose also has two peaks at the doses of 1.50×1016 and 2.50×1016 cm-2, which were exactly the same as that of the survival rate curve. So it was speculated that the changes of T-AOC probably decided the microbe survival situation after being implanted by low-energy N+. Three cellulase high yielding strains T.reesei 150-1、150-2 and 250-6 were obtained and the average production of cellulase was raised by 24.3% in shaking flasks. Comparing with the control strain, the mutants were potent in accumulating cellulase especially in the later stage. Related Articles | Metrics

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DNA-Binding Studies of Dehydroabietylamine and Its Schiff Base Derivatives FEI Bao-li;LI Wen;ZHANG Dian;XIA Bing;LONG Jian-ying;LIU Qing-bo 2012, 32 (5):  1-6.  Abstract ( 747 )   PDF (1230KB) ( 835 )   Save N-[(pyridin-2-ylmethylene)-imino]dehydroabietylamine schiff base (L2) and its reduced form (L3) were synthesized and characterized by elemental analysis, IR spectra, 1H NMR and MS techniques. The interaction between individual compound and salmon sperm DNA was investigated by UV, fluorescence and circular dichroism (CD) spectroscopic and viscosity analysis. Results show that all the three compounds bind to DNA by intercalation mode, and the schiff base is the strongest binding agent among them. Related Articles | Metrics

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Manufacturing and Application of Pyramid Multi-tube Microwave Carbonization Furnace ZHAO Min;ZHU Duan-wei;ZHOU Wen-bing;WANG Yan;SUN Yu 2012, 32 (5):  34-40.  Abstract ( 796 )   PDF (1931KB) ( 920 )   Save The pyramid microwave carbonization furnace was designed and manufactured. Microwave was irradiated by three microwave tube from three directions. The furnace was equipped with a blender, which increase the uniformity in resonant cavity. The design of double microwave leakage protection furnace door reduces the risk of microwave leakage. The research results showed that under the microwave irradiation power 1 160 W and radiation time 18 min, the activated carbon has methylene blue adsorption value of 210 mL/g, which is 1.75 times higher than the specifications in the standerd of activated carbon grade A (GB/T 13803.3-1999). Under the irradiation power of 680 W and irradiation time 5 min, the methylene blue adsorption value of phenol containing waste activated carbon can reach 110 mL/g, which is better than the level two standard of China. Related Articles | Metrics

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Preparation of Bamboo Knot Activated Carbon as Vinyl Acetate Catalyst Carrier by Phosphoric Acid Activation LIN Guan-feng;JIANG Jian-chun;WU Kai-jin;SUN Kang;QI Long 2012, 32 (5):  51-55.  Abstract ( 554 )   PDF (3301KB) ( 742 )   Save Bamboo knot was used to prepare activated carbon as vinyl acetate catalyst carrier by phosphoric acid activation.The result showed that the adsorption value of acetate,BET,microporous volume increased with rising temperature (325-400 ℃),impregnate ratio (0.60-0.75) and holding time (3-6 h),but the adsorption of zinc acetate showed the opposite trend.N2-adsorption isotherm showed that the possessed activated carbon developed microporous and macroporous structure.Under the optimized condition,i.e. activation temperature 350 ℃,holding time 5 h and impregnation ratio 0.65, the adsorption value of acetate and zinc acetate,BET,microporous volume were 527.5 mg/g, 70 g/L, 999.0 m2/g and 0.468 cm3/g,respectively. Related Articles | Metrics

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Effect of Pulping on the Properties of the Paper Prepared from Tobacco Stem ZENG Jian;CHEN Ke-fu;XIE Jian-ping;XU Guang;LI Jun;RAO Guo-hua;YANG Fei;GAO Wen-hua 2012, 32 (5):  101-105.  Abstract ( 774 )   PDF (1623KB) ( 1144 )   Save Reconstituted tobacco sheet made from tobacco stem was prepared by a paper-making method. Effect of extraction on variation of several chemical components in tobacco, and influence of pulping on the morphology and physical properties of tobacco stem pulp fiber were studied in this paper. The results indicated that the contents of water soluble sugars, total alkaloid, chloride and total nitrogen in tobacco stem decreased after extraction. The mass fraction of holocellulose was relative increased 12.4 %. With the increasing of beating degree of tobacco stem pulp from 10 degree to 48 degree, fiber lengths of the tobacco stem pulp decreased from 1.62 mm to 0.36 mm, and the contents of the fines increased from 6.90 % to 37.17 %; tensile index firstly increased from 13.39 N·m/g to 33.20 N·m/g and then decreased to 30.94 N·m/g; tear index decreased from 1.54 mN·m2/g to 0.88 mN·m2/g, bulk decreased from 2.08 cm3/g to 1.43 cm3/g; air permeability decreased from 59.58 μm/(Pa·s) to 0.03 μm/(Pa·s); burst index increased from 0.88 kPa·m2/g to 1.63 kPa·m2/g. Related Articles | Metrics