Table of Content

28 February 2007, Volume 27 Issue 1 Previous Issue    Next Issue

研究报告

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Syntheses, Crystal Structure and Properties of Dehydroabietylamine 5-Nitro-sacyldiene Schiff Base and Its Metal Complexes RAO Xiao-ping;SONG Zhan-qian;YAO Xu-jie;JIA Wei-hong;SHANG Shi-bin 2007, 27 (1):  1-7.  Abstract ( 708 )   PDF (579KB) ( 742 )   Save Dehydroabietylamine 5-nitro-sacyldiene Schiff base(L) and its Cu2+, Zn2+, Co2+ and Ni2+ complexes were synthesized and characterized by IR, 1H NMR, UV-vis spectrometric spectra, molar conductivity and single crystal X-ray diffraction. Cu(L)2 forms a classical complex with N2O2 donor, it is in monoclinic system with space group C2 and cell dimensions: a=3.6996 nm, b=1.0835 nm, c=1.2856 nm, α=90°, β=103.36°,γ=90°. The effects of organic solvents of various polarities on the UV-vis spectrometric spectra of ligand and complexes were investigated. With change of solvent,the ligand can change from enol to keto structure. The metal complexes are easily dissolved in organic solvents.The molar conductivities indicate their non-electrolyte properties in all these organic solvents such as DMF, chloroform and toluene. UV-vis spectrometric spectra change with the polarity of solvent, both ligand and complex show solvatochromism in these solvents. The ligand and its metal complex were also screened against S.aureus, B.subtilis and E.coli, the antibacterial screening data showed that both ligand and complex exhibit biological activity, while Cu complex was the strongest one. The obtained results indicated that polarity of solvent has great effect on the UV-vis spectrometric spectra of ligand and complex, the biological activity of metal complex has intimate relationship with metal. Related Articles | Metrics

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Secondary Metabolites of Two Marine-derived Mangrove Endophytic Fungi (Strains Nos. 1924# and 3893#) by Mixed Fermentation ZHU Feng;LIN Yong-cheng;DING Jian-hua;WANG Xin-ping;HUANG Li-sha 2007, 27 (1):  8-10.  Abstract ( 712 )   PDF (531KB) ( 1016 )   Save Mixed fermentation technique was applied to culture two marine-derived mangrove endophytic fungi (strains Nos. 1924# and 3893#) from the South China Sea in this paper. The crude extracts from the fermentation liquids extracted by ethyl acetate showed significant bioactivities of killing pests Heliothis armigera Hühner and Sinergasilus spp. in the primary bioassay. Two secondary metabolites A and B were isolated from this crude extracts, and elucidated by spectral methods as 6-methylsali-cylic acid(A) and cyclo(phe-phe)dipeptide(B) respectively. Compounds A and B were not obtained from these two strains by pure fermentation. Compound A was responsible for the significant biocide activities of the crude extracts. Related Articles | Metrics

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Study on the Bonds between Lignin and Xylan by 13C-Isotope Tracer Method YANG Hai-tao;XIE Yi-min;FAN Jian-yun;WANG Peng 2007, 27 (1):  11-14.  Abstract ( 625 )   PDF (948KB) ( 705 )   Save DHP-xylan complex (DHPXC) were prepared from xylan and coniferin or coniferin-[α-13C] in the presences of β-glucosidase, glucose oxidase and peroxidase. The result of analysis of DHPXC by CP/MAS 13C NMR and FT-IR spectra showed that β-O- 4、 β-β、 β-5 and β-1 structures were the main substructures of DHP in DHPXC. DHP could be connected with xylan through benzyl ether linkage and ester bond mainly at α-position. Related Articles | Metrics

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Study on Determination of Holocellulose Content of Bamboo by Near-infrared Reflectance Spectroscopy JIANG Ze-hui;LI Gai-yun;WANG Ge;HUANG An-min 2007, 27 (1):  15-18.  Abstract ( 780 )   PDF (799KB) ( 920 )   Save A rapid determination of holocellulose content of bamboo (Phyllestachys heterocycla (Carr.)Mitford cv.pubescens) has been developed by near-infrared reflectance spectroscopy (NIR)coupled by multivariate statistical analysis technique. The holocellulose contents of 54 samples were analyzed with traditional wet chemical technique, the spectra of which were collected by NIR. After the spectra were converted to the second derivative spectra with a gap of 25 nm, the prediction model for the holocellulose content of bamboo samples was established using partial least-square regression (PLS1)and full cross validation in the range of 1011-1675 nm and 1930-2488 nm. High correlations were obtained between the predicted NIR results and those obtained from traditional chemical method. The correlation coefficient of prediction model is 0.95 and standard error of prediction (SEP) is 0.76%. Related Articles | Metrics

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Dynamic Light Scattering and Electrophoresis Studies of Stability of Tannin Extract Solutions CHEN Ji-ping;GONG Ying;CHEN Wu-yong 2007, 27 (1):  19-24.  Abstract ( 631 )   PDF (1104KB) ( 712 )   Save The thermodynamic stability of tannin extract solutions has influence on tanning properties of the extracts, including penetrability, filling ability and fixation to the collagen fibre. In this study, thermodynamic stability of six extract solutions under different storage time, temperature and pH value, was investigated by dynamic light scattering (DLS). Some parameters, including Zeta potential, Z-average size of colloidal particles, and polydispersity index (PDI), were measured by Zetasizer Nano ZS series instrument. The results show that storage time has little influence on the stability of the extract solutions. Except Ternstroemia gymnanthera Sprague, for other extracts, the higher the temperature, the larger the colloidal particles are. Zeta potentials fell with the increase of temperature. The pH value has the strongest influence on stability. On the whole, solutions of condensed tannin extracts are much more stable toward pH value, temperature and storage time than those of hydrolysable tannin extracts. Related Articles | Metrics

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Characteristics of the Curing Reaction of Hydrogenated Terpinene Malaic Anhydride with Epoxy Resin KONG Zhen-wu;WANG Hao;CHEN Jian;DU Yu-min;CHU Fu-xiang 2007, 27 (1):  25-28.  Abstract ( 670 )   PDF (694KB) ( 711 )   Save The curing reaction of hydrogenated terpinene maleic anhydride(HTMA)with bisphenol A epoxy resin was investigated by FT-IR spectrum, and the curing degree, gelation time and its affecting factors were analyzed. The experiment results indicated that the cross-linking mechanism of hydrogenated terpinene maleic anhydride with bisphenol A epoxy resin was similar to anhydride curing with epoxy resin in the presence of accelerants. The curing degree was increasing as the curing temperature was arisen and the curing time was delayed, and the gelation time was shortened obviously as the curing temperature was arisen and the dosage of accelerants was increased. HTMA cured with bisphenol A epoxy resin completely at 110℃ in 8 h. HTMA cured with epoxy resin gently and slowly,owing to the synergistic effect of steric hindrance effect and stereo-electronic effect. Related Articles | Metrics

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Synthesis and Characterization of Hydrogenated Rosin Sucrose Esters REN Yun;DUAN Wen-gui;CHEN Chun-hong;CEN Bo 2007, 27 (1):  29-32.  Abstract ( 670 )   PDF (791KB) ( 742 )   Save In the presence of alkaline soap as emulsifier and catalyst, hydrogenated rosin sucrose esters (HRSE) were synthesized by transesterification reaction of hydrogenated rosin ethyl ester and sucrose under the conditions of (125±1)℃,molar ratio of hydrogenated rosin ethyl ester to sucrose 1:1, pressure 0.090 MPa without solvent.The target product was analyzed and characterized by TLC, IR, UV, HPLC, HPLC-MS and 13C NMR. Besides, critical micelle concentration (CMC) and the corresponding surface tension of the target product were measured to be 0.009 mol/L and 47 mN/m, respectively. Related Articles | Metrics

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Synthesis and Characterization of the Polymer of Rosin Allyl Alcohol Ester and Its Oxide (Ⅱ)——Study on synthesis of the oxide of macroporous reticular polymer of rosin allyl alcohol ester LEI Fu-hou;DUAN Wen-gui;ZHANG Xiao-li;WEI Ju-liang;AN Xin-nan 2007, 27 (1):  33-37.  Abstract ( 608 )   PDF (425KB) ( 666 )   Save Polymer of rosin allyl alcohol ester (PRAAE) was oxidized to produce its oxide through catalysis of disproportionated rosin amine Schiff's base copper salt, and hydrogen peroxide (30%) as oxidant. The polymer was characterized by IR, UV, softening point and TG analysis. Most of micropore sizes of synthesized polymer were above 5 nm, as measured by BET method. It was confirmed that relative molecular weight (Mr) of oxide of rosin allyl alcohol ester was above 25 266. Results showed that the synthesized polymer was a macroporous functional polymer. Related Articles | Metrics

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Study on Surface Chemistry Characteristics of Fines (Ⅱ)——Effects of Stock Conductivity on Fines in Wet-end System LIU Li-sha;DAI Hong-qi;WANG Shu-mei;YE Chun-hong;GONG Mu-rong;MA Jin-xia 2007, 27 (1):  38-42.  Abstract ( 880 )   PDF (893KB) ( 737 )   Save The charge demand, beating degree, and water retention value (WRV) of fines that come from original (P200) and fiber fragment (P'200) were studied under various stock conductivities and treating times. The results showed that cation demand (CD) and anion demand (AD) of both P200 and P'200 increase with stock conductivity raising, and reached the maximum 0.013 5 and 0.151 meq/g respectively at 0.3 s/m. The initial beating degrees of both P200 and P'200 were 51.5 and 64.5°SR respectively, and the initial WRVs of both P200 and P'200 were 318.7% and 452.3% respectively. For P200, its beating degree had clearly dropping trend, but its WRV was slightly increasing along with the enhancing of conductivity. For P'200, its beating degree had no change, but its WRV was obviously decreasing along with the enhancing of conductivity. When no other electrolyte was added into fines, the CD of P'200 is higher than P200, and the CTR of P200 was twice of P'200. After 0.3 s/m, the CTR of P200 and P'200 come to approach. At certain stock conductivity, the initial WRV of P200 was higher than that of its control sample, and the initial WRV was lower than that of its control sample. The stock WRVs of both P200 and P'200 had the increasing trend along with the treating time. The stock conductivity has little affection to the WRV of P200, but it has more compression capability to hydration film of P'200. Related Articles | Metrics

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Variation of Glass Transition Temperature and Control of Product Quality during Spray Drying HUANG Li-xin;ZHOU Rui-jun;MUJUMDAR A S 2007, 27 (1):  43-46.  Abstract ( 710 )   PDF (807KB) ( 1141 )   Save During the whole course of spray drying, state changes of the feed were analyzed. The characteristics of glass transition of material were studied. The relations among drying technological parameters, glass transition temperature(Tg) and product quality were also studied. The conclusions were obtained and presented. Owing to the effects of the particle glass transition on the product quality, the methods which can be used to improve the product quality are discussed. Related Articles | Metrics

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Effects of Laccase Treatment on Tensile Strength of Unbleached Kraft Pulp and Surface of Fiber LIU Na;SHI Shu-lan;PEI Ji-cheng;SHUANG Jin-ling 2007, 27 (1):  47-51.  Abstract ( 638 )   PDF (988KB) ( 644 )   Save The effects of laccase treatment on tensile strength of unbleached kraft pulp and surface of fiber were discussed and the optimal reaction conditions (such as laccase dosage, temperature, pH value and reaction time) of improving wet tensile strength were determined by experiments. In addition, scanning electronic microscopy(SEM) was used to observe the surface of the laccase-treated fibers. The results showed that laccase could improve wet-strength obviously, however, had no effect on dry-strength. The inactivated laccase treatment resulted no change of tensile strength. The optimal enzymatic treatment conditions of improving the wet strength were: laccase dosage 16 U for 1 g pulp, temperature 45℃,pH value 4.5 and reaction time 2 h. Inspection of the treated fibers iundern a scanning electron microscopy revealed that the smooth surface of original fiber became rough and loose after laccase treatment. The auto-adhesion between fibers occurred, which contributes to enhancing the wet-strength of pulp. Related Articles | Metrics

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Fermentation Conditions of Xylanase Production by Streptomyces sp. D21 JIANG Zheng-qiang;DENG Wei;ZHAI Qian;LI Li-te;CHENG Shao-bo 2007, 27 (1):  52-56.  Abstract ( 547 )   PDF (942KB) ( 724 )   Save Fermentation conditions of xyalnase production by Streptomyces sp. D21 were optimized in the study. The results of single-factor experiment showed that insoluble corncob xylan was the best carbon source and inducer, beef peptone was the best nitrogen source, the optimal initial pH value and cultivation temperature were 6.0 and 40℃, respectively. Under the optimal conditions, the highest xylanase activity of 1 128 U/mL was obtained after four days of cultivation. Related Articles | Metrics

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Studies on Isoflavone Production from Pueraria Root Residue under Solid-state Fermentation by Aspergillus niger ZU-01 SHI Ying-ying;XIA Li-ming 2007, 27 (1):  57-60.  Abstract ( 701 )   PDF (835KB) ( 705 )   Save Pueraria root residue from pueraria starch manufactory contains definite amount of isoflavone which is a kind of phytoestrogen with important physiological effects. Pueraria root residue was used as the main material for solid-state fermentation by Aspergillus niger ZU-01 strain. Xylanase and endo-β-glucanase(CMCase) produced from solid state fermentation could hydrolyze the cell wall's fibre of pueraria root residue, thus improving the yield of isolavone. Optimized culture medium of solid-state fermentation was composed of 70% pueraria root residue and 30% wheat bran, with 70% water content. After 120 h fermentation at the temperature of 30℃, the yield of total isoflavone reached 1.82 times as that by normal ethanol extraction. HPLC showed that the content of daidzein decreased while the content of isoflavone glucoside increased after fermentation. A 70% higher content of puerarin which reached 3.97 mg/g pueraria root residue was gained comparing to that of normal ethanol extraction. Related Articles | Metrics

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Study on Chemical Modification of Alkali Soluble Polysaccharides from Dioscorea fordii Prain et Burkill NIE Ling-hong;NING Zheng-xiang 2007, 27 (1):  61-66.  Abstract ( 672 )   PDF (1118KB) ( 569 )   Save The optimal reaction conditions of preparing carboxylmethyl alkali soluble polysaccharides from Dioscorea fordii Prain et Burkill (DFPA-Ⅰ) and vitriol esterified DFPA-Ⅰ were determined.The substitution degree of carboxylmethyl DFPA-Ⅰ was 0.55.The water solubility of carboxylmethyl DFPA-Ⅰ was 3.4 g, or 17 times of that of DFPA-Ⅰ.The study showed that the adsorption for Hg2+of carboxylmethyl DFPA-Ⅰ was 4.6 times of that of DFPA-Ⅰ. The substitution degree of vitriol esterified DFPA-Ⅰ was 1.06.Water solubility of vitriol esterfied DFPA-Ⅰ was 4.1 g, or 20.5 times of that of DFPA-Ⅰ. Effect in scavenging superoxide radicals generated from self-oxidation of pyrogallic acid by vitriol esterified DFPA-Ⅰ was 4 times of that of DFPA-Ⅰ.Carboxylmethyl DFPA-Ⅰ and vitriol esterified DFPA-Ⅰ have hypoglycemic activities on alloxan-induced diabetic mice,and their hypoglycemic activities are higher than that of DFPA-Ⅰ. With dosages of 0.03 and 0.1 g/kg by DFPA-Ⅰ, carboxyl-methyl DFPA-Ⅰ and vitriol esterified DFPA-Ⅰ respectively for 7 days, blood sugar in diabetic mice can be decreased by 33.7% and 45.2%, 54.6%and 63.8%, 68.2% and 89.4% respectively. Related Articles | Metrics

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Synthesis and Characteristics of Interfacial Coupling Agents for Agro-residues/Recycled Plastics Composite WANG Zhi-ling;WANG Zheng;REN Yi-ping 2007, 27 (1):  67-71.  Abstract ( 567 )   PDF (982KB) ( 647 )   Save The new interfacial coupling agents, namely polyurethane prepolymer of isocyanate end group (PU)for wheat straw-recycled low density polyethylene(LDPE) composites were synthesized utilizing PAPI and polyether polyols as raw materials.The structure and characteristics of the coupling agents were analyzed by FT-IR spectroscopy, GPC and DSC.The relationship between material ratio and physical and mechanical properties of the prepared composites were evaluated.The results show that urethane is the reacting product and the existence of free isocyanate end group(—NCO)of PU,number-average molecular weights (Mn)of PU1 and PU2 are 4370 and 7230,distrbution indexs are 2.1 and 2.3,Tg are -65.5 and -41.2℃,respectively.Compared with the composite without coupling agents,the physical and mechanical properties of the composites using PU1 and PU2 are improved significantly,while effect of PU1 is superior to PU2. With 2.5% PU1 coupling agent,the physical and mechanical properties of the composite exceed the standard GB/T 4897.6-2003 used for heavy-duty load-bearing boards in humid conditions. Related Articles | Metrics

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Studies on Synthesis of Polymerized Rosin Catalyzed by Mesoporous Molecular Sieves under Supercritical Carbon Dioxide Conditions GAO Hai-chun;YU Shi-tao;LIU Fu-sheng;XIE Cong-xia;LI Lu 2007, 27 (1):  72-76.  Abstract ( 530 )   PDF (1248KB) ( 617 )   Save Mo-MCM- 41 molecular sieve was prepared by hydrothermal synthesis method, and BO33-/ZrO2/Mo-MCM- 41 molecular sieve was prepared by impregnating Mo-MCM- 41 successively with H3BO3 and Zr(SO4)2 solutions. BO33-/ZrO2/Mo-MCM- 41 molecular sieve was characterized by XRD,N2/adsorption-desorption,FT-IR and NH3-TPD measurement. The results show that the molecular sieve obtained possesses the characteristics of mesopores, good long-range order and crystallinity, and that BO33- and ZrO2 are combined with the framework of the molecular sieve so that its acidity is improved. To find out a new method for synthesize polymerized rosin to replace the conventional methods using sulfuric acid as catalyst that exists serious disadvantages, the mesoporous molecular sieve was firstly used under supercritical CO2 condition. It was shown in the reaction that the supercritical CO2 fluid was favorable to the synthesis of polymerized rosin, and that BO33-/ZrO2/Mo-MCM- 41 molecular sieve exhibited good catalytic activity. Under supercritical carbon dioxide conditions,the product which showed a softening point of 106℃ was obtained by using BO33-/ZrO2/Mo-MCM- 41 mesoporous molecular sieves as catalyst. The reason for decrease of catalyst activity was studied by FT-IR measurement. It is the main factors leading to decrease of catalyst activity that acidity center of catalyst was lost after catalyst was used. Related Articles | Metrics

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Study on Extraction of Polyphenols from Canarium album (Lour.) Rauesch. HE Zhi-yong;XIA Wen-shui 2007, 27 (1):  77-80.  Abstract ( 675 )   PDF (831KB) ( 825 )   Save Solvent extraction, ultrasonic-assisted extraction and microwave-assisted extraction of polyphenols from Canarium album (Lour.) Rauesch. were studied, and extraction effects of three methods were also compared. The results indicated that 60%-70% aqueous acetone was the preferred solvent for polyphenol extraction, the optimum condition of solvent extraction was as follows: leaching time 1 h, temperature 20-30℃, ratio of material to solvent 1:20, the optimal power and action time for ultrasonic extraction were 80 W and 25 min, while that for microwave extraction were 280 W and 5 s. The polyphenol yields of three methods were 17.1%, 19.3% and 20.3% respectively. As compared with solvent extraction method, ultrasonic-assisted and microwave-assisted methods were more rapid and efficient for extracting polyphenols from C. album, and their UV spectrograms and HPLC chromatograms of polyphenol extracts were identical. Related Articles | Metrics

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Comparison of Essential Oils from Mentha haplocalyx Briq. by Steam Distillation and Supercritical Carbon Dioxide Extraction LIANG Cheng-yuan;TONG Hai-ying;ZHAO Zhi-qiang;Xia Bing;LI Wei-lin 2007, 27 (1):  81-84.  Abstract ( 901 )   PDF (672KB) ( 701 )   Save Essential oils were extracted from Mentha haplocalyx Briq. by steam distillation(SD) and supercritical CO2 extraction(SCDE). The chemical components of essential oil were analyzed by GC-MS. The extraction yield of mint oil by SD was 1.15%, and the extraction yield of mint oil by SCDE was 2.43%. The results of GC-MS analysis showed that 44 components from M. haplocalyx Briq. by SD that composed about 97% of the total essential oil, were separated and identified; and 38 components from M. haplocalyx Briq. by SCDE that composed about 92% of the total essential oil,were separated and identified. Relative content of main effective constituent, namely menthol, in the SD oil is 69.4%, and in the SCDE is 61.8%. Related Articles | Metrics

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Determination of Deoxyschizandrin and Schisandrin B in Schisandra chinensis (Tuecz.) Baill. by HPLC WANG Yang;NIU Yu-da;LIU Gui-feng 2007, 27 (1):  85-88.  Abstract ( 776 )   PDF (653KB) ( 775 )   Save A simple, rapid and sensitive method for the determination of deoxyschizandrin and schisandrin B in Schisandra chinensis (Tuecz.) Baill. was established. Bioactive compounds were ultrasonically extracted under the frequency of 40 kHz with 100% methanol for 80 min, and determined by high performance liquid chromatography. The HPLC separation was preformed on a KYA HIQ sil C18 column (250 mm×4.6 mm, 5 μm) at flowrate 1 mL/min and detective wavelength 250 nm, the solvent gradient program was as follow: acetonitrile/water increased linearly from 65% to 85% in the first 30 min, then isocratic for 2 min, acetonitrile/water decreased linearly from 85% to 65% in 2 min; at time 39 min, stopped the program (ready for next injection). Deoxyschizandrin and schisandrin B contents in the root, stem and leaves, and fruits of S. chinensis were determined. The results showed that deoxyschizandrin and schisandrin B were highest in the fruits, then in the stem and leaves, and lowest in the root. Deoxyschizandrin content in stem and leaves was equal to fruits, which may suggest that stem and leaves has the value to be explored as the medicinal substitute of fruits of S. chinensis. Related Articles | Metrics

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Study on Optimized Technolgy for Hydrogen Peroxide Bleaching of Wheat Straw Chemomechanical Pulp HONG Feng;SHEN Zhao-bang;FANG Gui-gan 2007, 27 (1):  89-92.  Abstract ( 546 )   PDF (667KB) ( 787 )   Save Various impacting factors in the hydrogen peroxide bleaching of wheat straw chemomechanical pulp (CMP) were investigated. The optimized bleaching technology was as follows: 6% H2O2,20% pulp consistence,0.05% MgSO4,0.3% DTPA,5.0% Na2SiO3,3.5% NaOH,80℃ bleaching temperature,2.5 h bleaching time,with which the CMP brightness reached 53%(ISO). Based on the results obtained above, a new technology, i.e.,enzymatic pretreatment followed by high consistence two-stage hydrogen peroxide bleaching was proposed so as to further improve CMP brightness, to increase its additional value, as well as to develop its application. Related Articles | Metrics

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Extraction of Ginsenosides with Ultrasonically Enhanced Supercritical Dioxide Carbon Reverse Microemulsion Extraction LUO Deng-lin;ZHU Wen-xue;QIU Tai-qiu;NIE Ying 2007, 27 (1):  93-96.  Abstract ( 622 )   PDF (838KB) ( 693 )   Save With the adoption of self-designed ultrasonically enhanced supercritical CO2 reversed microemulsion(USCRM) extraction device, and bis(2-ethylhexyl) sodium sulphosuccinate(AOT) with ethanol as main surfactant and co-surfactant respectively, the extraction of ginsenosides with USCRM was studied, and the effects of ultrasound power and operations were observed. According to the experimental results,1 g ginseng was soaked 12 h with 0.6 mL water before extraction, extraction pressure 24 MPa, extraction temperature 45℃, extraction time 4 h, separation pressure 5 MPa, separation temperature 55℃, CO2 flow rate 2.0 L/h.The ginsenosides extraction yield with USCRM is 5.28 and 1.64 times of those with ethanol/supercritical CO2 extraction and with AOT/ethanol/ supercritical CO2 reversed microemulsion extraction respectively.The ginsenosides yield is increased with the increases of ultrasound power and ultrasound extraction time. Related Articles | Metrics

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Study on Extraction and Properties of Pigment from Seeds of Euonymus japonicus Thunb. Lü Jin-shun 2007, 27 (1):  97-100.  Abstract ( 616 )   PDF (772KB) ( 704 )   Save Physicochemical properties and extraction conditions of the pigment of seeds of Euonymis japonicus Thunb.were investigated. Results showed that good yield of pigment could obtained by acetone extraction, with fresh material:solvent=1:10(g:mL) at 35℃ for 40 min. The pigment is stable against heat, acid-alkali and reducing agent. Under sunlight, degradation of the pigment could be accelerated. Metallic ions,common salt and sucrose had no effect on the tone of pigment. This kind of pigment possesses poor anti-oxidation ability. It is classified to be carotenoids. Related Articles | Metrics

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Study on Preparation of Activated Carbon from Timber Surplus of Acacia mangium Willd. CHEN Cong-jin;LI Yue;ZHAO Lan-xian 2007, 27 (1):  101-103.  Abstract ( 608 )   PDF (591KB) ( 728 )   Save Feasibility of preparing activated carbon from timber surplus of Acacia mangium. with ZnCl2 by microwave irradiation was studied.The effects of the ratio by weight of ZnCl2 to timber surplus of A. mangium,microwave irradiation time and pH value of ZnCl2 solution on the quality of activated carbon were investigated.Under the condition of microwave power 900 W and ZnCl2 solution concentration 50%,the optimum technology on preparation of activated carbon with ZnCl2 by microwave irradiation was obtained. The mass ratio of ZnCl2 to timber surplus of A. mangium 2.5:1, microwave irradiation time 6 min,pH value of ZnCl2 solution 1.The yield of activated carbon was 47.5% and methylene blue adsorption was 12.9 mL/0.1 g which was 1.43 times of the level specified for the first grade in GB／T 13803.2-1999 standard. The product was used for treatment of Cr6+ solution (pH value 4.0, concentration 50 mg/L),Cr6+ adsorption was 9.974 mg/g activated carbon. Related Articles | Metrics

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Application of Terpene Resin Emulsion in Water-soluble Paper/Plastics Laminating Adhesives WU Zong-hua;CHEN Shao-ping;LI Ai-min 2007, 27 (1):  104-106.  Abstract ( 883 )   PDF (544KB) ( 643 )   Save A series of water-soluble paper/plastics laminating adhesives were prepared using an EVA emulsion, terpene resin emulsions and cationic styrene-acrylamide copolymer, and effects of surfactants in the terpene resin emulsions on properties of the adhesives were investigated. The results showed that the cationic copolymer was able to increase greatly viscosity and tensile strength of the EVA emulsion. The optimum dosage for the copolymer was 0.5% based on mass of the EVA emulsion. The largest tensile strength was obtained at mass ratio 0.3 of the terpene resin emulsion and the EVA emulsion. Terpene resin emulsion prepared with polymeric surfactant (HS-2) performed the best effects in increasing tensile strength of the adhesives. Related Articles | Metrics

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Synthesis of Superabsorbent Resin from Carboxymethyl Cellulose and Acrylic Acid under Microwave Irradiation LI Yun-yan;ZHENG Li-wei;CHENG Hua-hua 2007, 27 (1):  107-111.  Abstract ( 717 )   PDF (850KB) ( 647 )   Save The superabsorbent resin was synthesized from carboxymethyl cellulose and acrylic acid under microwave irradiation. The effects of microwave power, reaction time, feeding sequence, mass ratio of raw materials, neutralization degree of acrylic acid, amount of crosslinking agent and initiator were investigated. The optimal synthetic conditions were found as follows: carboxymethyl cellulose (CMC) 2 g, acrylic acid 18 g, deionized water 50 g, NaOH 6.0 g, K2S2O8 0.7 g, N,N'-methylene bisacrylamide solution(1 g/L)4 mL, low microwave power for 2.5 min and vacuum drying temperature 60℃. This resin could absorb 738 times of its mass of deionized water. The absorbencies of this superabsorbent resin in tap water, artificial urine, artificial blood and normal saline were examined respectively. The water-absorbing rate, water-keeping capability and regeneration of the resin were also tested. Related Articles | Metrics

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Stability of Lutein and Its Esters LI Da-jing;FANG Gui-zhen;LIU Chun-quan;YU Jia-peng 2007, 27 (1):  112-116.  Abstract ( 1456 )   PDF (741KB) ( 1096 )   Save Stabilities of lutein and its esters against light, heat, acid, alkali, metal ions, oxidant and reductant were studied. Results showed that both lutein and lutein esters were unstable against light, and stable in darkness. Their preservation rate was 0.35% toward outdoor sunlight for 0.5 h while they were preserved constantly in darkness. They were slightly stable against heat but their degradation could be accelerated with decreased preservation rate under long time and high temperature. Lutein ester was more stable toward light and heat than lutein under the same condition and esterification of —OH group with fatty acids might stabilize lutein against heat and light. They were unstable with decreased preservation rate toward Fe3+,Fe2+, Cu2+ and strong acid while stable against Zn2+, Mg2+,Ca2+,K+,Na+, alkali and Na2SO3 as well as slightly stable toward H2O2. It was noted that VC could degrade significantly lutein esters and lutein, in which absorbance of lutein esters decreased more quickly than that of lutein. Related Articles | Metrics

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Study on Ultrasonic Extraction of Pine Seed Polysaccharides LIU Rong;SUN Fang;CHEN Xiu-li;WANG Zhen-yu; 2007, 27 (1):  117-120.  Abstract ( 612 )   PDF (896KB) ( 739 )   Save Ultrasonic extraction of pine seed polysaccharides was studied by using single factor experiment and orthogonal method. It was concluded that the optimal condition of extraction were 100 g degreased pine seed powder, 90℃ extraction temperature, 45:1 (mL:g) solvent to solute weight ratio, 35 min extraction duration, 800 W ultrasonic power. Under this condition, the yield of polysaccharides is 9.74%. Compared with direct-heating extraction, ultrasonic extraction can shorten the extracting time, and improve yield of pine seed polysaccharides. Related Articles | Metrics

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Progress in Synthesis of Perillyl Alcohol LI Qian-he;ZHAN Xiao-xiong;FENG Zhen-zhen;LI Xue-hui;WANG Le-fu 2007, 27 (1):  121-126.  Abstract ( 638 )   PDF (1052KB) ( 1247 )   Save Progress in synthesis of perillyl alcohol is summarized with 54 references. The key reaction of each synthetic route was analyzed. Characteristics of various approaches were discussed. It is described emphatically that 2,10-epoxypinane is isomerized to perillyl alcohol catalyzed by various Bronsted acids. In addition, the natural occurrence, application and isolation method of perillyl alcohol were briefly described. Related Articles | Metrics