Table of Content

28 February 2008, Volume 28 Issue 1 Previous Issue    Next Issue

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Lipophilic Components from the Bark of Quercus pannosa Hand.-Mazz. LI Qin;SHEN Yue-mao;LI Ping 2008, 28 (1):  92-94.  Abstract ( 486 )   PDF (464KB) ( 600 )   Save Chemical constituents of Quercus pannosa Hand.-Mazz. were studied. Eight compounds were isolated and purified via silica gel and Sephadex LH-20 column chromatography repeatedly and their structures were elucidated on the basis of spectroscopic evidences and physiochemical properties. They were identified as ursolic acid 28-O-β-D-xylopyranosyl(1→3)-β-D-glucopyranoside (Ⅰ), 3-O-β-D-xylopyranosyl(1→3)-β-D-glucopyranosyl ursolic acid 28-O-methyl ester (Ⅱ), friedelin (Ⅲ), 3-hydroxy-16-friedelanone (Ⅳ), 5-(hydroxymethyl)furan-2-carbaldehyde (Ⅴ),β-sitosterol (Ⅵ). All compounds were isolated from this plant for the first time. Related Articles | Metrics

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Chemical Constituents and Antioxidant Activities of the Extractives from Juglans mandshurica Maxim. Bark [JP]SI Chuan-ling;LIU Zhong;HUI Lan-feng;KIM Jin Kyu;BAE Young Soo [JP][JZ)] 2008, 28 (1):  29-32.  Abstract ( 701 )   PDF (501KB) ( 866 )   Save On the basis of chemical and spectroscopic evidence, 11 compounds, including 3 flavanols: pinobanksin (1), taxifolin (2) and ampelopsin (3), 3 flavonols: kaempferol (4), quercetin (5) and myricetin (6), and 5 flavonoid glycosides: afzelin (7), astragalin (8), quercitrin (9), isoquercitrin (10) and myricitrin (11), were isolated from the stem bark of Juglans mandshurica Maxim. This was the isolation of compounds 1, 3, 5, 6, 8 and 10 from this species for the first time. The antioxidant activities of the crude extract, partitioned fractions and isolated compounds were evaluated by DPPH free radical-scavenging assay. Results showed that EtOAc and H2O partitioned fractions and compounds 1-6 exhibited strong antioxidant activities compared with controls. Related Articles | Metrics

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Progress in Wood and Non-wood Hemicellulose Research CHEN Hong-lei;HUANG Feng;YANG Gui-hua;CHEN Jia-chuan 2008, 28 (1):  119-126.  Abstract ( 843 )   PDF (1334KB) ( 1023 )   Save The types, structures characterization and separation of hemicelluloses from various kinds of wood and straw materials have been summarized based on pioneer's study. Covalent linkages between part of hemicellulose and lignin have been proposed to exist in plant materials and in chemical pulp and formed lignin-carbohydrate complex(LCC)structure.The mechanical properties of pulp was influenced by hemicelluloses in pulps which was introduced.The modified Kappa number method was used for determination of "true" lignin content in pulps.In addition, isolation methods of hemicelluloses from wood and non-wood materials and their futher purification and detection have also been outlined. Related Articles | Metrics

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Applied Study on High-effect Desulfonation of Sodium Lignosulfonate ZHU Li;LUO Xue-gang 2008, 28 (1):  67-72.  Abstract ( 774 )   PDF (1136KB) ( 1110 )   Save The byproduct of sulfite pulping, namely sodium lignosulfonate was used as raw material in this study, and the influences of reaction conditions such as cooking temperature, time and the content of NaOH to the desulfonation of sodium lignosulfonate were studied using uniform design. The results indicate that the optimal desulfonation condition is as follows: cooking at 180℃ for 3h with 7% NaOH. Lignin, which is obtained from desulfonation of sodium lignosulfonate, has good glass, transition property, thermoplastic property and heat-plasticity through the analyses of IR spectra, GPC(gel permeation chromatograms), TG-DSC and rheological analysis. The research provides the academic reference for the exploitation and utilization of thermoplastic lignin. Related Articles | Metrics

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Study on Biosynthesis of Dehydrogenation Polymers of Lignin YANG Hai-tao;XIE Yi-min 2008, 28 (1):  1-5.  Abstract ( 692 )   PDF (954KB) ( 637 )   Save Guaiacyl-type dehydrogenation polymers (DHPs) of lignin were prepared from coniferin by bulk method and end-wise method respectively in the presence of peroxidase, glucose oxidase and β-glucosidase in the laboratory to simulate natural condition in plant. The DHPs were analyzed by GPC, FT-IR,1H NMR and 13C NMR. The result of analysis indicated that the chemical structure of DHP from bulk method had higher content of β-5 structure and the chemical structure of DHP from end-wise method had higher content of β-O-4 structure. The DHP from end-wise method exhibited higher relative molecular weight (Mr) than the DHP from bulk method. It was also proved that β-O-4,β-β,β-5 and β-1 structures were main substructures in DHPs although there were some minor substructures such as coniferyl alcohol, vanillin, phenylpropane units with α-methylene and some lignin moieties connected with carbohydrate through benzyl ether linkage. Related Articles | Metrics

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Characterization and Antioxidant Activity of Flavonoid Extract from Leaves of Adinandra nitida Merr. ex Li ]LIU Ben-guo;ZHAN Yu;NING Zheng-xiang;GAO Jian-hua;XU Ke-yong 2008, 28 (1):  6-10.  Abstract ( 546 )   PDF (538KB) ( 710 )   Save In order to develop Adinandra nitida Merr. ex Li (a kind of particular plant in China),flavonoid extract from leaves of A. nitida (FE) was obtained by traditional solvent extraction. By high performance liquid chromatograph (HPLC) and tandem electrospray ionization mass spectrometry (ESI-MSn), the major flavonoid in leaves was identified as camellianin A, whose content in FE was as high as 51.19%±1.13%. The flavonoid extract showed high antioxidant activity by measuring abilities of scavenging DPPH radicals and hydroxyl radicals. It also exhibited strong reducing power. These results revealed that FE could be served as a new natural antioxidant. Related Articles | Metrics

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Primary Study on Antioxidative and Radical Scavenging Activities of Extracts from Phyllanthus emblica L. Bark WANG Yong-mei;CHEN Jia-hong;WU Dong-mei;XU Man;WU Zai-song 2008, 28 (1):  11-15.  Abstract ( 595 )   PDF (931KB) ( 1030 )   Save The major component of extracts from Phyllanthus emblica L. bark is composed of partially galloylated polymeric prodelphinidins and procyanidins which indicate strong antioxidative character from their chemical structure. Experimental data showed that the target product, prepared by ultrasonic extraction and purification, could scavenge radical (e.g. DPPH, scavenging rate 91.13%, higher than which of tea polyphenol (TP)), complex metal ions (e.g. Fe2+, 358mg/g) and inhibit lipid peroxidation. This primary study results indicated that the extracts would be hopefully developed as a new sort of natural antioxidant and radical scavenging agent. Related Articles | Metrics

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Interface Characteristics of Mechanically Ground Rice/Wheat Straws ZHOU Ding-guo;LIAN Hai-lan;ZHOU Xiao-yan 2008, 28 (1):  16-22.  Abstract ( 620 )   PDF (2856KB) ( 1036 )   Save The interface characteristics of rice/wheat straws after being ground mechanically, such as surface shape, surface chemical function group, surface free energy, and surfical free radicals, were studied. The results showed that compared with wheat straw, rice straw was easier to be broken. From scanning electron microscopy (SEM), it was obvious that ground straws through ball milling were broken, split and fuzzed, and inner surface of cells was exposed remarkably. FT-IR showed that the characteristic peaks of lignin and cellulose on the surface of wheat straw were more significant than rice straw. The free-radical concentrations of rice/wheat straws were increased dramatically after being ground and being heated in the range of 100℃ to 200℃ by electron spin resonance (ESR)test. Similar result was observed from surface free energy testing that surface free energy of straws was improved after being ground and the surface free energy of wheat straw was higher than that of rice straw, which implies that wheat straw is easier to be bonded than rice straw. Two kinds of particleboards using 6% isocyanate were prepared which exceeded the requirements of Chinese National Standards GB 4897.3-2003, while wheat straw particleboards had better properties. Related Articles | Metrics

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Study on Xylose-fermentation Capacity of Recombinant Saccharomyces cerevisiae XU Yong;CHEN Ying;YONG Qiang;HUANG Min-ren;YU Shi-yuan 2008, 28 (1):  23-28.  Abstract ( 608 )   PDF (1069KB) ( 764 )   Save In order to establish the xylose-fermentation pathway in Saccharomyces cerevisiae, two key genes for xylose-metabolizing, xylose reductase xyl 1 and xylitol dehydrogenase xyl 2, were amplified from Pichia stipitis by polymerase chain reaction (PCR) technique and cloned into YEp 24, a high-copy expression vector in yeast, respectively and simultaneously, and then they were constructed into S. cerevisiae by transformation using lithium acetate. In three recombinant strains, the recombinant S. cerevisiae NLR04 could grow and ferment in media with xylose as sole carbon source while the two genes xyl 1 and xyl 2 were transferred simultaneously into an auxotrophic mutant of S. cerevisiae, and it showed an ineffective capacity of fermenting xylose to ethanol under trace oxygen or anaerobic conditions and its ethanol yield could reach 37.0% of the theoretical value. These recombinant yeast strains enriched the strains library for the xylose-metabolic engineering. Detective results confirm that there was some difference between P. stipitis and the recombinant S. cerevisiae NLR04 in the gene xyl 1 and the gene xyl 2 expression mechanism, the gene xyl 1 is constitutely expressed in the latter but xylose-inducible in the former. However, the gene xyl 2 is reversed as it is constitutely expressed in the former but xylose-inducible to some extent. On the xylitol-dehydrogenase relative enzyme activity, the recombinant S. cerevisiae NLR04 is markedly lower than P. stiptis, which maybe the one of bottlenecks for xylose-utilization in recombinant strains. Related Articles | Metrics

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Study on Adsorption of Sc(Ⅲ) by Black Wattle Tannins Immobilized on Collagen Fiber WANG Bi;ZHANG Feng-jin;QIN Song;LIAO Xue-pin 2008, 28 (1):  33-38.  Abstract ( 580 )   PDF (1124KB) ( 890 )   Save Black wattle tannin was immobilized on collagen fiber by aldehydic cross-linking reaction to prepare a novel adsorbent, and its adsorption behaviors toward scandium ion(Sc3+) were investigated. It was found that black wattle tannin immobilized on collagen fiber (IBWT) exhibits an excellent adsorption capacity to Sc3+ in HOAc-NaOAc buffer solution. The adsorption capacity at 50℃ and pH value 6.40 was as high as 83.3mg/g when the initial concentration of Sc3+ in aqueous solution was 100mg/L. The adsorption capacity was increased with the increases of pH value and temperature. The adsorption process is an endothermal process and the adsorption isotherms could be well described by the Langmuir equation. Chemical adsorption is probably the mechanism of Sc3+ on IBWT. Further experiments indicated that the adsorption capacity of IBWT toward Sc3+ was almost unchanged after three times adsorption-desorption recycles. Related Articles | Metrics

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Graft Copolymerization of Glycidyl Methacrylate onto Hardwood Pulp Initiated by Ammonium Cerium(Ⅳ) Nitrate HUANG Jun;ZHAI Hua-min 2008, 28 (1):  39-43.  Abstract ( 707 )   PDF (1108KB) ( 663 )   Save Graft copolymerizaton of bleached eucalyptus pulp with glycidyl methacrylate (GMA) using a ceric salt initiator system was studied in detail. Epoxy activated grafted fibers with a grafting rate up to 100% and epoxy group content of 1.4-2.7mmol/g were synthesized successfully. The graft copolymerization under different conditions of pH value, reaction temperature and time, initiator and monomer concentration were characterized by grafting rate, epoxy group content and its hydrolysis rate, and using FT-IR to identify the grafted product. Results showed that proper increases of the reaction temperature and time, initiator and monomer concentrations at pH value 1.3 are beneficial to the graft copolymerizaton although the hydrolysis of its epoxy group is occurred to a certain extent. Related Articles | Metrics

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Study on Stabilization of Colorless Rosin Pentaerythritol Ester GAO Hong;SONG Zhan-qian;SHANG Shi-bin 2008, 28 (1):  44-48.  Abstract ( 627 )   PDF (850KB) ( 605 )   Save For many applications, the stability of rosin ester is an important property which determines its commercial viability.The kind and amount of antioxidants and light stabilizers which affected the stability of colorless rosin pentaerythritol ester were studied. The results showed that the stability was improved markedly when antioxidant K-B 0.3% and light stabilizer LD+UV-20 0.4% were added into colorless pentaerythritol ester. The product had many merits as follows: better thermal stability, color was less than 1(Gardner) when it was heated at 180℃ for 8h; better antiaging stability. The rate of weight-gain was 0.213% and color was 3-4 (Gardner) when it was irradiated with a 400W mercury lamp at a distance of 40cm for 15h; better storage stability, its color and concentration of hydroperoxidation product were kept constant nearly at 40℃ for 30d. Oxidation resistance was also evaluated by oxidation induction time (OIT), which was consistant with the above conclusions. Related Articles | Metrics

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Adsorption of Low-concentration Phosphine on Impregnated Activated Carbon under Trace Oxygen Content Condition WANG Xue-qian;NING Ping;XU Hao-dong;JIANG Ming 2008, 28 (1):  49-54.  Abstract ( 649 )   PDF (1116KB) ( 721 )   Save In order to utilize industrial tail gas containing high concentration of CO to produce valuable products, impregnated activated carbon was used as sorbent and its adsorption for PH3 had been studied in laboratory. Activated carbon was impregnated with HCl, KNO3 and hexanediol respectively. The results showed that 7%(mass fraction) HCl was the optimum impregnant, 70℃ for optimum temperature, and 0.8%(volume fraction) for optimum oxygen content. The structure of the impregnated activated carbon was determined using method of nitrogen adsorption. The modification resulted in a decrease in the volume of pores smaller than 2nm, the most noticeable change was in the range of pores from 0.3nm to 1.5nm. After modification, decrease in volume of micropores is 87% of decrease in volume of total pores. After adsorption, the surface area decreased 28% with 29% decrease in the volume of micropores. Modification with HCl significantly increases the adsorption of activated carbon for PH3 while the effects of other materials used in this study are less pronounced. It is likely that HCl presenting in the small pores acts as a catalyst for enhancing the oxidation of PH3 into P2O5 or P2O3, which can be strongly adsorbed by activated carbon in small pores from 0.3nm to 1.5nm. Related Articles | Metrics

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Study on Extraction,Separation and Purification of Lutein from Tagetes erecta Linn. Flowers QIN Qing 2008, 28 (1):  55-58.  Abstract ( 666 )   PDF (798KB) ( 852 )   Save Method of extraction, separation and purification of lutein from marigold (Tagetes erecta Linn.) flowers by hexane-ethanol, or petroleum ether were investigated. The optimum processing conditions are: hexane (as extraction solvent) and 95% ethanol (volume ratio 3:2), extraction temperature 60℃, extraction time 4-5 h, extraction times 5-6 times, ratio of extraction solvent to marigold 15:1(mL:g), lutein yield 7.5%-7.9% of dry marigold flowers. Related Articles | Metrics

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Preparative Separation of High-purity Cellooligosaccharides by Polyacrylamide Gel Column PENG Hong;LIN Lu;PENG Tao;SUN Run-cang 2008, 28 (1):  63-66.  Abstract ( 547 )   PDF (782KB) ( 700 )   Save A procedure for preparative separation of purified cellooligosaccharides was developed by polyacrylamide gel column. Under similar conditions, the dosage of eluent for finishing a one-step separation process did not change with the eluting rate. The dosage of eluent had no effect on the separation. The purities of fractions of cellopentaose, cellotetraose and cellotriose separated by one-step process were 96.67%, 68.76% and 82.00%, respectively. The overall recovery of cellooligosaccharides mixture was 81.38%. High-purity cellooligosaccharides were obtained with purity of 98.45% for cellopentaose, 98.65% for cellotetraose and 98.12% for cellotriose by the second separation under the same separating conditions. The corresponding recoveries for cellopentaose, cellotetraose and cellotriose were 90.91%, 47.42% and 68.68%, respectively. Related Articles | Metrics

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Synthesis and Characterization of Thermoplastic Konjac Glucomannan ZHANG Zheng-guang;LUO Xue-gang 2008, 28 (1):  73-78.  Abstract ( 514 )   PDF (1309KB) ( 677 )   Save A novel material, namely thermoplastic konjac glucomannan(TKGM) was synthesized from konjac glucomannan (KGM), vinyl acetate(VAc) and methyl acrylate(MA) for the first time in this research. This novel material is water resistant and degradable. The grafting efficiency was preferable when graft copolymerization was initiated by ammonium persulfate. The optimal condition of reaction corresponds to 8mmol/L for ammonium persulfate, reaction time 3h, reaction temperature 70℃ and concentration of 0.49mol/L for vinyl acetate and methyl acrylate. The structure and properties of TKGM were characterized by FT-IR, polarizing optical microphotography (POM), low temperature differential scanning calorimetry (DSC) and TG-DSC. The results indicated: a graft copolymerization reaction was taken place between KGM and VAc, MA. The original crystal configuration of KGM was destroyed, and the molecular structure was disordered. The glass transition temperature (Tg) of TKGM was only 13.14℃, and there's an obvious melting decalescence peak at 102℃, the difference between decomposed temperature and melting temperature is above 200℃. This means that TKGM has a good thermoplasticization property. Related Articles | Metrics

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Study on Hydrolysis of Cellulose into Cellooligosaccharide by Formic Acid LI Jia-zhe;LIN Lu;SUN Yong;PENG Hong;WU Zhen;SUN Run-cang 2008, 28 (1):  79-82.  Abstract ( 612 )   PDF (889KB) ( 952 )   Save Preparation of cellooligosaccharide by acid hydrolysis of biomass cellulose with mixed acid was carried out, and the effects of temperature and time were studied. The crystalline index of cotton gradually declined with the increase of treatment time. The optimum hydrolysis conditions were: 1g cotton, 24g mixed acid in which the concentration of hydrochloric acid is 4%(mass fraction), 65℃ and 8h, under which yields of reducing sugars, glucose and cellooligosaccharide were 25.06%, 16.71% and 8.35% respectively. Related Articles | Metrics

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Study on Gasification of Cassava Residues in Steam Atmosphere YUE Jin-fang;YING Hao;JIANG Jian-chun;SUN Yun-juan 2008, 28 (1):  83-86.  Abstract ( 463 )   PDF (918KB) ( 679 )   Save Gasification of cassava residues in steam atmosphere was studied. The influences of gasification temperature and heating rate on yield and composition of the products were explored. Main gas components are H2, CO, CH4, CO2, and major components of tar are phenol derivatives, in which 2,6-di-tert-butyl-4-methyl-phenol has the highest content of 42.27%. According to experimental results, cassava residues can be used to produce combustible gas, char, and phenol derivatives through gasification. Related Articles | Metrics

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Optimization of the Ultrasound Assisted Extraction of Shikimic Acid from Illicium verum Hook.f. Using Response Surface Methology LU Jia-hui;WANG Di;GUO Wei-liang;MENG Qing-fan;ZHANG Yi-bo;TENG Li-rong 2008, 28 (1):  87-91.  Abstract ( 685 )   PDF (990KB) ( 867 )   Save Response surface analysis methodology (RSM) was used for optimizing the extraction process of shikimic acid from Illicium verum Hook.f.. Based on single-factor experiments, three independent variables, namely:extracting time, solvent-solid ratio and ultrasound power, were selected as affecting factors during extraction. The experiments were arranged according to Box-Behnken central composite experiment design. Response surface analysis method was applied to determine the effect of central composite experiment design. The results showed that the optimum ultrasound extraction conditions for shikimic acid were as follow: 1g material, extraction time 202s, ultrasound power 318W and ratio of liquid to solid 46.4:1 (mL:g). The predicted shikimic acid extraction yield is 8.25%, while the actual extraction yield is 8.21%, with relative error of 0.45%. Related Articles | Metrics

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Analysis on Components and Contents Diversity of Bamboo Vinegars Produced by Different Techniques CHEN Shun-wei;ZHUANG Xiao-wei;BAI Ming-e;YE hua-lin 2008, 28 (1):  95-98.  Abstract ( 632 )   PDF (757KB) ( 896 )   Save Different bamboo vinegars prepared by earth kiln (BVE) and self-ignition stove (BVS) respectively were compared in terms of physical and chemical indexes. The result of experiment indicated that refractive index and total acid content of BVS were 38.64% and 34.17% higher respectively than those of BVE, and the pH value was lower by 0.3. The experiment on chemical components and contents diversity of BVE and BVS were carried out by GC-MS. The result proved that BVE had 96 components and BVS had 112 components. The main components were organic acids, alcohols, phenolics, aldehydes, ketones, esters, pyridins, furans, alkanes, etc. Related Articles | Metrics

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Study on Extraction Technology of Water-soluble Polysaccharides from Bamboo(Phyllostachys edulis(Carr.)Lehaie) Shoots LI Yi 2008, 28 (1):  99-102.  Abstract ( 467 )   PDF (742KB) ( 887 )   Save In order to study the optimum technological conditions for extracting water-soluble polysaccharides from bamboo (Phyllostachys edulis(Carr.) Lehaie) shoots, the effects of each factor such as ratio of water to sample, extraction time, extraction temperature and ethanol volume fraction on the extraction of the water-soluble polysaccharides of bamboo shoots were investigated, using the methods of single factor test and orthogonal design test of L9(34). The results showed that the main factors affecting the yield of polysaccharides were sequenced as follows:ethanol volume fraction>extraction temperature>extraction time>ratio of water to sample; the optimum technological conditions were as follow: ratio of water to sample 10:1(mL:g), extraction time 4h, extraction temperature 100℃ and the ethanol volume fraction 95%. Using the optimum technological conditions, the yield of the water-soluble polysaccharides of bamboo shoots was 0.32%. Related Articles | Metrics

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Surfactivity of the Bolaform Surfactant Disodium Sulfodehydroabietate CHEN Li-yun;FANG Gui-zhen;WANG Xian-ling;LI Shan-shan;LI Hong-zhen 2008, 28 (1):  103-107.  Abstract ( 651 )   PDF (993KB) ( 809 )   Save A new unsymmetrical Bolaform surfactant, namely disodium sulfodehydroabietate (DSDA) was synthesized by sulfonation of dehydroabietic acid followed by neutralization, and its structure was characterized by FT-IR, 1H NMR and MS. The critical micelle concentration (CMC) of DSDA was determined by surface tension method at 303.0K, pH value 10.5. The surfactivity at different NaCl concentrations (0-0.50mol/L) was studied. The results showed that DSDA shows a transition in its surface tension curve; the CMC of DSDA solution decreases from 25mmol/L to 3.83mmol/L along with the increase of NaCl concentration, the surface ultimate adsorption at the air/water interface (Г∞) decreased and the minimum surface tension was basically unaffected. Related Articles | Metrics

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Modeling of the Extraction Process of Brucea javanica(Linn.) Merr.Oil with Supercritical Carbon Dioxide LEI Hua-ping;GE Fa-huan;HU Qiao-yi;BU Xiao-ying 2008, 28 (1):  108-112.  Abstract ( 642 )   PDF (1026KB) ( 608 )   Save The kinetics of extraction of Brucea javanica(Linn.) Merr. oil with supercritical CO2 was studied through simulation of the process. A kinetic model of extraction of B. javanica oil using supercritical CO2 was developed on the basis of the differential mass balance to simulate the extraction process. The model could simulate the distribution of the solute concentration in CO2 inside extraction bed as a function of extraction time and height of extraction bed. The model could also simulate the solute concentration in CO2 in the outlet of the extractor as a function of time. This model could simulate satisfactorily the process of extraction with the error between simulation data and experimental data less than 10%, and the effects of the parameters such as pressure and temperature on extraction yield were investigated through the model. Related Articles | Metrics

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Study on Enzymatic Extraction of Anthocyanins from Blackcurrant Marc WANG Ping;MIAO Yu 2008, 28 (1):  113-118.  Abstract ( 877 )   PDF (1040KB) ( 771 )   Save Through experiments, the optimum conditions of enzymatic extraction of anthocyanin from blackcurrant(Ribes nigrum L.) marc, using cellulase were as follows: temperature 50℃,time 100min, ratio of marc to solvent 1:9, amount of enzyme 1% of material, pH value of enzyme solution 5.0, the extraction rate of anthocyanin was 86.63%. Using pectinase, the optimum conditions were: temperature 50℃,time 120min, ratio of marc to solvent 1:8, amount of enzyme 1.4% of material, pH value of enzyme solution 3.5, the extraction rate of anthocyanin was 91.09%. The extraction effect of pectinase is better than that of cellulase. Related Articles | Metrics

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New Process to Produce Bamboo-made Dissolving Pulp LÜWei-jun;PU Jun-wen;YAN Zhi-pei;YU Hua 2008, 28 (1):  59-62.  Abstract ( 642 )   PDF (725KB) ( 776 )   Save Bleached kraft pulp of bamboo was treated with bacterial xylanase alone and bacterial xylanase in combinated with alkali. Results showed that α-cellulose content of pulp treated with bacterial xylanase could meet the standard of dissolving pulp of short viscose rayon. The pulp treated with bacterial xylanase-alkali process could meet almost all standard of dissolving pulp and its α-cellulose mass fraction could reach 98.64% with bacterial xylanase 120IU/g and NaOH 4%(mass fraction). Alkali abstraction following xylanase treatment could also reduce the contents of ash and iron ion in bamboo kraft pulp. Study showed that bamboo bleached kraft pulp treated with xylanase and alkali could completely substitute prehydrolysis process before digestion to produce regular bamboo dissolving pulp. Related Articles | Metrics