Table of Content

30 June 2011, Volume 31 Issue 3 Previous Issue    Next Issue

研究报告

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Study on Copolymers Prepared from Silk Fibroin and Poly (D,L-Lactide) GAO Qin-wei;LI Ming-zi;KOU Qin;WU Guo-cheng 2011, 31 (3):  1-4.  Abstract ( 674 )   PDF (870KB) ( 566 )   Save The copolymers of silk fibroin and poly(D,L-lactide)(PSFLA) were prepared from D,L-lactide and silk fibroin (SF) through ring-opening polymerization catalyzed by SnCl2/TSA. Viscometry, polarimetry, 1H nuclear magnetic resonance,FT-IR, thermo-gravimetry, differential scanning calorimetry and scanning electron microscopy were employed to detect the obtained copolymers. Racemic copolymers were obtained at all D,L-lactide/SF mass ratios. When D,L-lactide/SF mass ratio was 6:1, complex crystal could be formed, and the melt point of copolymers increased with increasing D,L-lactide/SF ratios. The thermodecomposition temperature of PSFLA was over 220℃. The obtained copolymers may form lamellas through self-assembly of lactide units and SF units. Related Articles | Metrics

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Chemical Constituents in Essential Oil of Illicium verum by Supercritical CO2 Extraction and High- speed Counter-current Chromatography WANG Dai-jie;WANG Dai-jie;GENG Yan-ling;LIU Wei;WANG Xiao;LIU Jian-hua;LIU Jing 2011, 31 (3):  99-104.  Abstract ( 756 )   PDF (619KB) ( 708 )   Save Supercritical CO2 extraction was used to extract star anise essential oil from star anise (Illicium verum Hook. f.) under the pressure of 25 MPa and temperature of 35 ℃. Three compounds including anisaldehyde, methyl isoeugenol and trans-anethole were separated and purified by high-speed counter-current chromatography (HSCCC) with a two-phase solvent system which composed of n-hexane-ethyl acetate-methanol-water (1:0.2:1:0.1, volume ratio). The separation yielded a total of 10 mg of anisaldehyde, 7mg of methyl isoeugenol, and 640mg of trans-anethole from 1.3g of essential oil in one-step separation with the purity of 98.9%, 96.8% and 99.7%, respectively. They are determined by HPLC. The chemical structures of these compounds were identified by EI-MS. Related Articles | Metrics

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Extraction and Antioxidant Activities of Polysaccharides from Pileus of Dictyophora rubrovalvata ZHUANG Yong-liang;SUN Li-ping;SHANG Xiao-li 2011, 31 (3):  45-49.  Abstract ( 541 )   PDF (985KB) ( 744 )   Save Effects of different factors on extraction of polysaccharides from pileus of Dictyophora rubrovalvata were studied. The antioxidant activities of polysaccharides were evaluated. The extraction technology using water was optimized by orthogonal experiment. The optimum conditions were: extraction temperature 85℃, ratio of material to water 1:25, extraction time 2.5h. Under the optimized experiment conditions, extractive yield was 8.25%. Polysaccharides were composed of glucose, mannose and galactose. Mass concentration of glucose content was the highest (58.19%). Polysaccharides of pileus had high reducing power and scavenging hydroxyl radical activity. The reducing power and scavenging hydroxyl radical activity increased with the concentration of polysaccharides increased. However, scavenging superoxide anion radical of polysaccharides was weak. Related Articles | Metrics

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Diels-Alder Reaction of Myrcene and p-Benzoquinone LUO Jin-yue;HAI Wei;LEI Fu-hou 2011, 31 (3):  75-78.  Abstract ( 672 )   PDF (748KB) ( 699 )   Save Preparation of 5,5-dimethyl-5,6,7,8,9,10-hexahydroanthracene-1,4-diol using myrcene and p-benzoquinone as raw materials by Diels-Alder reaction was studied. The structure of product was identified by melt point test, elemental analysis, IR and 1HNMR. The purity of product reached 99.0% by HPLC analysis. Effects of different types of catalysts, catalyst amount, reaction temperature, reaction time and molar ratio of myrcene to p-benzoquinone on the yield of product were discussed. The optimum reaction conditions were as follows: n(myrcene):n(p-benzoquinone)=1.2:1, boron trifluoride etherate as catalyst, amount of catalyst 9.8% (according to weight of p-benzoquinone), reaction temperature 40℃ and reaction time 12h. Under these conditions, the yield of product is 68.0%. Related Articles | Metrics

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Treatment of Wastewater from Biodiesel Production by Means of Flotation/ Coagulation/Hydrolytic Acidification /Contact Oxidation TAN Jun-li;CHEN Yu-ping;LU Tao-li;YANG De-qin 2011, 31 (3):  94-98.  Abstract ( 569 )   PDF (970KB) ( 687 )   Save The flotation/coagulation/hydrolytic acidification/contact oxidation processes were used to treat biodiesel wastewater. The actual operation results showed that the system has good treatment efficiency, strong resistance to shock loading and stable water quality. The removal rate of oil is up to 85% by flotation method. After the flotation/coagulation/hydrolysis acidification/contact oxidation processes, the removal rates of pollutants in effluent,such as CODCr, SS, NH3-N and TP are not less than 90% and the amount of CODCr is less than 80mg/L.The efluent quality can meet the first grade requirement in Chinese standard for discharge of major water pollutants in chemical industry (DB 32/939-2006). Related Articles | Metrics

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Review of the Preparation of Primary Amine from Carboxylic Acid LIAN Jian-wei;XIA Jian-ling;HUANG Kun;LI Mei;YANG Xiao-hua 2011, 31 (3):  115-121.  Abstract ( 924 )   PDF (1203KB) ( 631 )   Save In this paper, various common methods to preparing primary amine from carboxylic acid were systematically summarized. They included primary amine prepared through amidation of carboxylic acid, carboxylic acid firstly reduced to alcohol, ketone and aldehydes and followed by ammonolysis for preparing primary amine, and direct conversion of carboxylic acid. Meanwhile, the advantages and problems existing in each method were pointed out. Finally, the preparation of primary amine from carboxylic acid were prospected. Related Articles | Metrics

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Effects of Extremely-low-concentration Acid Hydrolysis on Levulinic Acid Production from Rice Husk and Characterization of Cellulosic Structure CHANG Chun;WANG Duo;WEI Wei;JIANG Xiao-xian 2011, 31 (3):  23-27.  Abstract ( 561 )   PDF (1074KB) ( 618 )   Save The effects of extremely-low-concentration acid hydrolysis on levulinic acid production from rice husk and cellulosic structure were investigated. Using dilute sulfuric acid with mass concentration 0.1% as catalyst, the levulinic acid production from rice husk was studied. The results show that the optimal ratio of liquid to solid is 32:1(mL:g), temperature is 240℃, and hydrolysis time is 30min. Under these conditions, 12.81% of the total mass conversion yield of cellulose and hemicellulose can be obtained. The cellulosic structure was characterized by methods of scanning electron microscopy, X-rays diffraction and infrared. The results show that through hydrolysis the cellulosic structure was destroyed remarkably. The crystallinity decreased, and cellulose and hemicellulose were also hydrolyzed. On this basis, a comprehensive hydrolysis model of rice husk was proposed finally. Related Articles | Metrics

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Preparation of Nano-selenium Using Tamarind Polysaccharides as Template GAO Yi-xia;ZHOU Xiang-jun;ZHANG Ji;GAO Jin-xia 2011, 31 (3):  5-10.  Abstract ( 761 )   PDF (1513KB) ( 751 )   Save Nano-selenium was prepared using tamarind seed polysaccharides (TSP) as template by reaction of selenious acid with ascorbic acid. The effects of reaction time, reactant concentration, temperature and other experimental conditions on particle size and morphology of product were studied. The products were characterized by UV-absorption, SEM and XRD. The results showed that when the reaction system is in the water bath at 60 ℃ for 4 h with TSP mass fraction 0.02 % and mass ratio of selenious acid to ascorbic acid 2:1, the red and uniform selenium is obtained. Its average size is about 39nm. Related Articles | Metrics

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Chemical Degumming Technology of Pueraria Fiber LIU Yang-yang;ZHANG Ru-quan;JI De-yu;WANG Cheng-guo 2011, 31 (3):  79-83.  Abstract ( 638 )   PDF (1066KB) ( 747 )   Save The eco-friendly natural pueraria fiber was prepared from the pueraria slag through the chemical degumming method. Using the variable control method, the effects of sodium hydroxide concentration and cooking duration on pueraria fiber's fineness and tensile breaking strength were analyzed. The result shows that pueraria fiber's fineness and tensile breaking strength tend to decrease with the increase of NaOH mass concentration or alkaline cooking time. By comparing different tests, the optimal pueraria degumming technology is that: the pueraria fiber's residual gum rate is about 8%. When the sodium hydroxide concentration is 17.5g/L and alkaline cooking time is 3h. Related Articles | Metrics

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Research Progress on Resources and Bioactivity Applications of 3-Carene HE Li-zhi;WANG Jing;ZHAO Zhen-dong;CHEN Yu-xiang;GU Yan; 2011, 31 (3):  122-126.  Abstract ( 855 )   PDF (901KB) ( 790 )   Save Resources and bioactivity applications of 3-carene were reviewed in this study. 3-Carene mainly exists in the volatile essential oils of Pinaceae plants, such as P.longifolia salisb., P.sylvestris L., P.szemaoensis, and of Chinese medicinal herbs, such as Piper nigrum L., Murraya koenigii L., Levisticum officinale Lovage etc.. The essential oils are usually prepared with steam distillation, and then rectified and purified to obtain 3-carene. It can be used as active ingredients directly in the form of original herbs or as intermediates and compositions of pharmaceuticals, pesticides, cosmetics in the form of essential oil. Related Articles | Metrics

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Hydrolysis of Corn Stalks for the Production of Furfural Using Solid Acid as Catalyst YU Xian-chun;LI Xiang-su;YI Xue-jing;GONG Zheng-wu 2011, 31 (3):  71-74.  Abstract ( 777 )   PDF (800KB) ( 717 )   Save The purpose of this study is to reduce the environmental influence of furfural preparation by conventional liquid acid catalysis. Hydrolysis of corn stalks for the production of furfural was carried out using SO42--TiO2/clay solid acid as catalyst. The main factors influencing the reaction, such as hydrolysis temperature, reaction time and the amount of solid acid were analyzed. They were optimized by response surface methodology (RSM) in order to set up a quadratic regression model. The optimum experimental conditions were as follows: particle size 0.45mm, solid-liquid ratio 1:10, hydrolysis temperature 158℃, reaetion time 3.8h, and catalyst amount 6.2%, the yield of furfural was 60.95%. Related Articles | Metrics

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Kinetic and Thermodynamic Parameters for Adsorption of p-Aminophenol by Bamboo-charcoal WANG Gui-xian;ZHANG Qi-wei 2011, 31 (3):  84-88.  Abstract ( 704 )   PDF (773KB) ( 825 )   Save The kinetic and the thermodynamic parameters of adsorption of p-aminophenol by bamboo-charcoal were studied. The kinetic experiment results showed that adsorption of p-aminophenol on bamboo-charcoal can be dealed with pseudo first-order reaction. The apparent adsorption rate constant and activated energy were k=5.08×10-4s-1 and Ea=19.6kJ/mol at 298K respectively. The thermodynamics analysis showed that the adsorption behavior of the bamboo-carbon for p-aminophenol obeys the Langmuir isotherm model. The results showed that the adsorption process is an exothermic process with the heat of adsorption of -18.0kJ/mol. It also indicated that the adsorption process is mostly physical adsorption. The sorption process is a spontaneous process with Gibbs energy ΔG=-26.8 kJ/mol. Related Articles | Metrics

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Optimization of Ultrasound-assisted Extraction of Carnosic Acid from Rosemary Leaves LI Da-wei;LI Da-wei;BI Liang-wu;ZHAO Zhen-dong;LI Dong-mei;LIU Xian-zhang 2011, 31 (3):  60-64.  Abstract ( 691 )   PDF (495KB) ( 781 )   Save Carnosic acid, the key bioactive component, was extracted from leaves of rosemary (Rosmarinus officinalis L.) using ultrasound-assisted extraction. The different factors such as ethanol concentration, variety of acid stabilizer, acid stabilizer dosage, ultrasonic frequency, ultrasonic power, ultrasonic extraction time and the solid-liquid ratio were studied. The content variations of carnosol, rosmarinic acid, oleanolic acid and ursolic acid were also examined. The experimental results for 5.0g rosemary leaves showed that the optimum ultrasonic extraction conditions at room temperature were: ethanol solution concentration 75 %, acid stabilizer 3g hydrochloric acid, ultrasonic frequency 28kHz, ultrasonic power 200W, ultrasonic extraction time 40 min, solid-liquid ratio(g:g) 1:16. The extraction rate of carnosic acid reached 18.64mg/g under the above extraction conditions. Related Articles | Metrics

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Ultrasound-assisted Extraction of Flavanoids from Sophora japonica L. and Its Inhibition on Tyrosinase DU Zhi-yun;TU Zeng-qing;ZHANG Kun;MO Rong-qing;PAN Wen-long;TANG Zhi-kai 2011, 31 (3):  39-44.  Abstract ( 801 )   PDF (1027KB) ( 632 )   Save Flavonoids of Sophora japonica L. were extracted with ultrasound-assisted. The optimal technological conditions were determined by single-factor and orthogonal experiment. The inhibition of S.japonica L. extract on mushroom tyrosinase was studied by testing the enzyme activities under the influence of extract. The results showed that the optimum extraction conditions were as follows:S.japonica L. powder 2.0g, volume fraction 60% ethanol 40mL,extraction temperature 80℃,ultrasound power 300W and time 30min. The final flavonoids yield is (16.5±0.4)%. The concentration of S. japonica L. extract was 0.03 g/L, when the inhibition on tyrosinase (IC50) was 50%. It was about fiftienth more than that of arbutin(IC50=1.60g/L). The kinetics of inhibition on enzyme by S.japonica L. extract was the type of competitive inhibition. Related Articles | Metrics

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Influence of Lignin on the Pore Structure of Activated Carbon by H3PO4 Activation WANG Yang;LIU Shou-xin 2011, 31 (3):  33-38.  Abstract ( 688 )   PDF (1199KB) ( 857 )   Save Effect of lignin on the porous properties of activated carbon produced by H3PO4 activation has been investigated using sawdusts of poplar, larch and flax as starting materials. Lignin was removed by acetic acid-sodium chlorite method. The surface area and pore structure of obtained activated carbon were analyzed by H2-TPD. The adsorption properties were identified by iodine and methylene blue adsorption. Thermal behavior of the raw material was compared with the product after lignin removal by TG/DTG analysis. The results showed that with removal of lignin, the BET surface area, total pore volume and external surface area of activated carbon were decreased. Removal of lignin from wood materials was beneficial for the increment of micropore volume and surface area of micropore in activated carbon. The results of iodine and methylene blue adsorption were also demonstrated. Thermogravimetric results showed that the thermostability of raw material was decreased after removal of lignin. Related Articles | Metrics

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Adsorption of Tannic Acid Using Palygorskite Adsorbent HUANG Jian-hua;LIU Yuan-fa;SONG Zhi-hua;JIN Qing-zhe;WANG Xing-guo 2011, 31 (3):  50-54.  Abstract ( 623 )   PDF (805KB) ( 535 )   Save In this paper, the mechanism of adsorption of tannic acid using palygorskite were studied. The adsorption kinetics was studied based on the pseudo-first order rate equation and the pseudo-second order equation. Thermodynamic parameters for the adsorption were determined using the Van't Hoff equation. Studies found that sorption kinetics was described by a pseudo-second-order model. Both the rate constant and the initial adsorption rate firstly increased and then decreased with the increase of temperature. However, the increasing of the initial concentration of tannic acid caused the decrease of the rate constant and the initial adsorption rate. The physicial adsorption of tannic acid on palygorskite was proposed. The process was exothermic with the decrease of the degree of freedom. The enthalpy value of adsorption of tannic acid on palygorskite adsorbent was about 20kJ/mol. The adsorption of tannic acid on palygorskite adsorbent was driven by the collaboration of hydrogen bonding, electrostatic force and hydrophobic interactions of tannic acid molecular with adsorbent. In conclusion, the palygorskite adsorbent was useful for the adsorption of tannic acid due to large capacity for the adsorption of tannic acid. Related Articles | Metrics

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Effect of Medium Components on Cellulase Production by Trichoderma reesei LI Zhi-he;ZHANG Li;LI Xin;ZHU Jun-jun;YU Shi-yuan;YONG Qiang 2011, 31 (3):  55-59.  Abstract ( 750 )   PDF (999KB) ( 683 )   Save Effects of different kinds and ratio of carbon sources, nitrogen sources and C/N ratio on biosynthesis of cellulase by Trichoderma reesei Rut C-30 were investigated. Production of cellulase was carried out using steam-exploded corn stover and Avicel as carbon sources (m(corn stover):m(Avice)4:6), ammonium sulfate and urea as nitrogen sources(m(N of ammonium sulfate):m(N of urea)5:2), soybean meal 4g/L, wheat bran 10g/L and the C/N 6. The results showed that the maximum filter paper activity and β-glucosidase activity were 8.37FPIU/mL and 1.61IU/mL, after cultivation for 132 h respectively. Related Articles | Metrics

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Optimization of Flash Extraction of Catechins from Tea by Response Surface Methodology ZHU Xing-yi;YANG Jun-hui;XIE Jie;GU Yan-zhi;WANG Ping 2011, 31 (3):  105-109.  Abstract ( 712 )   PDF (1143KB) ( 697 )   Save Flash extraction of catechins from tea was studied. At the basis of single-factor tests, the factors, i,e., ethanol volume fraction, liquid to solid ratio and extraction time were selected to do. Box-Benhnken central composite test and response surface analysis. The optimized conditions were as follows: ethanol volume fraction 65%, liquid to solid ratio 20:1(mL:g) and extraction time 87s. Under the optimum conditions, the total yield of catechins was 12.33% and the relative error to the predicted value was 0.15%. Related Articles | Metrics

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Investigation of Process to Cultivate High-lipid-content Chlorella sp. YANG Jing;JIANG Jian-chun;ZHANG Ning 2011, 31 (3):  11-16.  Abstract ( 554 )   PDF (1003KB) ( 545 )   Save The heterotrophic capability of Chlorella sp. was investigated. The conditions of lipid productivity were optimized by fractional factorial design (FFD) and orthogonal experiments. The results showed that Chlorella sp. had the heterotrophic capability and grew well in glucose, galactose and maltose. Compared to that in autotrophy the biomass which grew in mixtrophy and heterotrophy increased by 3.72 times and 2.74 times respectively, using glucose as additional carbon resource. Through FFD and orthogonal experiments, nitrogen source concentration and temperature were selected as significant factors. The highest lipid productivity of 58.49mg/(L·d) occurred under the conditions of nitrogen source concentration 6.0mmol/L, temperature 25℃ and pH value 6.0. GC-MS analysis demonstrated that the fatty acid composition of the lipid was similar to that of vegetable oil and its unsaturated fatty acid content reached 72.97%. It is a promising material for biodiesel production. Related Articles | Metrics

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Preparation of High-butane-working-capacity Granular Activated Carbon from China Fir Sawdust ZHU Guang-zhen ZHU Guang-zhen;DENG Xian-lun;LIU Xiao-min;XU Yu;LIN Guan-feng;GONG Jian-ping 2011, 31 (3):  17-22.  Abstract ( 808 )   PDF (395KB) ( 808 )   Save A simple route has been developed for preparing granular activated carbon (GAC) with high butane working capacity (BWC). Concentrated sulfuric acid was used during phosphoric acid activation for the production of the activated carbon. A granular activated carbon with high BWC of 165g/L and an apparent density of 241g/L was obtained from China fir sawdust. Simultaneously specific surface area, total pore volume, micropore volume and average pore diameter of the GAC reached 2627m2/g, 1.574cm3/g, 0.941cm3/g and 2.397nm, respectively. The results of orthogonal test showed that the adopted combination of factors is: phosphoric acid concentration 56%, impregnation ratio 1.9:1, sulfuric acid amount 6%, sulfuric acid concentration 80%, drying temperature 300℃, drying time 3h, activation temperature 450℃ and activation time 60 min. It was also seen that the dosage of concentrated sulfuric acid and activation temperature were the most important factors for preparing GAC for butane adsorption. Finally, compared to previous studies, this study can shorten the preparation period from 20-70h to less than 5h. Related Articles | Metrics

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Corrosion Inhibition of Several Plant Leaves Extracts to Aluminium DENG Shu-duan;LI Xiang-hong;FU Hui 2011, 31 (3):  65-70.  Abstract ( 731 )   PDF (1200KB) ( 636 )   Save The plant leaves extracts can be used as the "green" inhibitor for preventing metal from corrosion. The inhibition effects of Neosinocalamus affinis leaves extract (NALE), Acer buergerianum leaves extract (ABLE), Machilus yunnanensis leaves extract (MYLE) on the corrosion of aluminium in hydrochloric acid solution were studied for the first time by mass loss and potentiodynamic polarization curves methods. Effects of the factors including inhibitor concentration (0.1～1.0g/L), temperature (20～50℃), immersion time (1.5～6h) and acid concentration (1.0～3.0mol/L) on inhibition efficiency were investigated and discussed in detail. The results show that three leaves extracts retard effectively the corrosion of aluminium in 1.0mol/L HCl solution, and the maximum inhibition efficiency values are 84.2%(NALE), 82.1%(ABLE) and 80.6%(MYLE) respectively with 1.0g/L inhibitor concentration. The adsorption of each extract on aluminium surface obeys Langmuir adsorption isotherm. Inhibition efficiency value increases with the inhibitor concentration increasing, while decreases with the immersion time, temperature and acid concentration increasing. Under the same condition, the corrosion inhibition follows the order: NALE>ABLE>MYLE. Polarization curves reveal that three leaves extracts behave as mixed-type inhibitors. Related Articles | Metrics

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Determination of Oil Content of Camellia oleifera Abel. Seeds by Near Infrared Reflectance Spectroscopy YUAN Jiao-jiao;WANG Cheng-zhang;CHEN Hong-xia;YE Jian-zhong; 2011, 31 (3):  28-32.  Abstract ( 673 )   PDF (819KB) ( 752 )   Save Near-infrared reflectance spectroscopy of Camellia oleifera seed was used to determine its oil content, which was compared with the oil content data of 30 samples of C.oleifera Abel. seeds obtained by conventional Soxhlet extraction method. Combined with the corresponding near infrared reflectance spectroscopy, the accurate model was well established with different pretreatment methods and regression analysis. The results demonstrated that the correlation coefficients of calibration (RC) and the root mean square errors of calibration (RMSEC) through first derivative、multiplicative signal correction(MSC)and Savitzky-Golay filter spectral pretreatment methods were 0.925 67 and 2.53 respectively. The correlation coefficients of cross-validation (RCV) and the root mean square errors of cross-validation(RMSECV) were 0.91727 and 2.67 respectively. The best spectral ranges were 4200.20-4088.35cm-1 and 4666.89-4639.89cm-1. Furthermore, the comparison of the calibration models by PLS and PCR showed that PLS was the optimal regression method. The correlation coefficients (r) between NIRS value and chemical value was 0.8978. All parameters indicated that near infrared reflectance spectra information of C.oleifera seeds could be used to predict the oil content fast and exactly. Related Articles | Metrics

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Separation and Purification of β-Glucosidase from Penidiella sp. HEY-1 and Its Properties HE You-wen;LI Jiang;WANG Jian-feng;RAO Jun;MAO Hui-ling 2011, 31 (3):  110-114.  Abstract ( 781 )   PDF (1273KB) ( 751 )   Save Purification of electrophoretic and homogeneity β-glucosidase(BGL) from Penidiella sp. HEY-1 in bean dregs broth was studied. After ethanol precipitation, DEAE-Sepharose Fast Flow chromatography and Sephadex G-100 chromatography the purified BGL is obtained. The molecular weight of BGL was 65.5 ku analyzed by SDS-PAGE. Its optimum pH value and tempe-rature were 3.0 and 60-70℃, respectively. It was stable in the pH value range of 2.0-8.0 and temperature up to 70℃. It was also found that the BGL can be stimulated by Mn2+ and inhibited by Na+. Other metal ions had little effects on the activity of BGL. The results showed that the obtained enzyme directly affects β-glucosidic compounds such as p-nitrophenyl-β-D-glucopyranoside(p-NPGlu) and o-nitrophenyl-β-D-galactopyranoside (o-NPG). The Km and vmax were 0.434mmol/L, 1.0×10-3mol/(L·min) respectively using p-NPGlu as substrate, while the parameters were 0.411mmol/L and 3.3×10-4mol/(L·min), respectively, using o-NPG as substrate. Related Articles | Metrics

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Synthesis and Characterization of Bornylene- sulfur Dioxide Polysulfone Resin WU Zhen-hua;YANG Xiao-qin;ZENG Tao;LUO Jin-yue 2011, 31 (3):  89-93.  Abstract ( 742 )   PDF (562KB) ( 594 )   Save Bornylene-sulfurdioxide polysulfone resin(BE-SO2)was synthesized by free radical copolymerization of monomers SO2 and bornylene (BE) which synthesized from α-pinene. Similarly, BE-SO2-Ma and BE-SO2-St were synthesized using BE, SO2, maleic anhydride (MA) as monomers and BE, SO2, styrene (St) as monomers respectively. Effects of operating conditions such as monomer ratio, polymerization temperature and reaction time on the copolymer yields are discussed. The results showed that the optimum reaction conditions are as follows: reaction temperature -20℃, reaction time 4 h, n(BE)1mmol, n(BE):n(Ma)1:1, n(BE):n(St)1:1, CYC as solvent and volume 4 mL, and the highest yield of BE-SO2, BE-SO2-Ma, BE-SO2-St are 70%、64% and 71%, respectively. The structure of the copolymers were characterized by FT-IR, GPC, DSC, EA and SEM. BE-SO2 was a black solid powder with weight average molecular weight(Mw) of 1069, number average molecular weight (Mn) of 376, and Tg of 134.5℃; BE-SO2-Ma polysulfone resin is a dark brown solid powder with Mw of 1576, Mn of 402 and Tg of 152.0℃; BE-SO2-St polysulfone resin is a tan solid powder with MW of 33054, Mn of 952 and Tg of 174.8℃. Related Articles | Metrics