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Antibacterial and Antioxidant Activities of Two Citrus Essential Oils and Their Main Components
Huazheng CHEN, Kai ZHU
Chemistry and Industry of Forest Products    2021, 41 (4): 17-22.   DOI: 10.3969/j.issn.0253-2417.2021.04.003
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Orange oil, tangerine oil and limonene were used as target samples to study their scavenging capacities on ABTS+·, DPPH· and O2-· and total antioxidant capacity(FRAP value), as well as their antioxidant abilities in vivo and inhibitory abilities to Staphylococcus aureus, Escherichia coli, Bacillus subtilis and Pseudomonas aeruginosa. The results showed that tangerine oil had the best scavenging capacity on ABTS+· and DPPH·, their IC25 values were 1.481 and 24.824 g/L, respectively; limonene had the best scavenging effect on O2-·, and the scavenging rate was 32.86% at 0.8 g/L. The ferric ion reducing antioxidant power(FRAP) values of limonene, orange oil and tangerine oil were close to each other and weaker than those of BHA. At the mass concentration of 100 mg/L, the catalase(CAT) activities in Caenorhabditis elegans treated with tangerine oil and limonene were about 46 U/mg, which was 1.63 times of that in the untreated control group. Orange oil, tangerine oil and limonene had a relatively good inhibitory effect on S. aureus and E. coli. The inhibitory effect of tangerine oil on S. aureus was close to limonene, and the diameter of inhibition zone was about 11 mm. Orange oil, tangerine oil and limonene had an excellent antioxidant activity in vitro and in vivo, and they were moderately sensitive to S. aureus.

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Research Progress on Nanocellulose and Its Use in Lithium Batteries
Ying WANG, Chunhui MA, Jin ZHOU, Mengyang LI, Jinquan YUE
Chemistry and Industry of Forest Products    2021, 41 (6): 105-116.   DOI: 10.3969/j.issn.0253-2417.2021.06.014
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As a natural material with good biocompatibility and biodegradability, nano-cellulose has unique structure and excellent mechanical properties. It has been widely used in the construction of electrochemical energy storage system of lithium-ion batteries(LIBs), and has made significant progress. This thesis provided an overview of the preparation and modification methods of cellulose nanofibrils(CNF), cellulose nanocrystals(CNC) and bacterial cellulose(BC) in the context of the application of advanced energy storage devices LIBs and green materials nanocellulose, and reviewed the research progress on the application of nanocellulose in the field of LIBs. It was mainly divided into three aspects: first, nanocellulose-based flexible LIBs electrodes; second, carbon materials derived from nano cellulose as electrodes; third, nano cellulose derived battery separator. Finally, some problems in this field were analyzed, summarized and prospected.

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Production of Xylooligosaccharides and Monosaccharides from Poplar by Two-step Sodium Chlorite and Sodium Hydroxide Pretreatment
Xin FANG, Peiyao WEN, Yong XU, Junhua ZHANG
Chemistry and Industry of Forest Products    2021, 41 (5): 23-30.   DOI: 10.3969/j.issn.0253-2417.2021.05.004
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In this work, the effects of sodium chlorite(SC) and sodium hydroxide(SH) pretreatments on the chemical composition of poplar were investigated. The preparation of xylooligosaccharides(XOS) and monosaccharides by enzymatic hydrolysis was discussed. The results showed that poplar lignin could be selectively removed by SC pretreatment. After 6% SC pretreatment at 70℃ for 3 h, the removal of lignin reached 65.8%, whereas 90.7% glucan and 92.4% xylan were retained. The data of X-ray diffraction and X-ray photoelectron spectroscopy indicated that SC pretreatment removed the total lignin in poplar and the surface lignin on poplar, and increased the crystallinity and accessibility of the substrate. After the pretreatment with 6% SC at 70℃ and 1% SH at 50℃, the contents of glucan, xylan, and lignin in the pretreated poplar were 67.8%, 21.5%, and 2.9%, respectively. The highest XOS yield of 47.2% from the SC-SH-pretreated poplar by xylanase hydrolysis was obtained, and the XOS preparation was composed of 98% xylobiose. Compared with the poplar treated by 6% SC at 70℃ for 3 h, SH pretreatment increased the yield of XOS by 7.1 times. After the hydrolysis by xylanase, the glucose yield of two-step pretreated poplar residue was 90.2% with a cellulase lading of 30 mg/g dry matter. Finally, 52.5 g XOS, 317.6 g glucose and 49.9 g xylose were obtained from 1 kg raw poplar. The results of this work provided a theoretical guidance for the preparation of XOS and monosaccharides from poplar under mild conditions.

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Research Progress on Electrode Materials from Activated Carbon-based Supercapacitors
Haonan CHEN, Ting YU, Yali ZHOU, Xiping LEI, Xiaolin GUAN
Chemistry and Industry of Forest Products    2021, 41 (5): 113-125.   DOI: 10.3969/j.issn.0253-2417.2021.05.016
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Supercapacitors are a new type of green energy storage device with the advantages of fast charging and discharging and long service life. The electrode material is the core component of supercapacitors. The carbon from biomass is considered as a good choice for the preparation of activated carbon because of its wide variety, low price, environmental friendly, porous structure and rich in hetero-atoms, and it is the most popular electrode material for commercial applications. This paper reviewd the effects of pore structure and specific surface area on the performance of electrochemical energy storage of activated carbon, summarized the common pore structures of biomass activated carbon such as tubular, lamellar, honeycomb and network and their electrochemical properties, and analyzed the effects of different biomass components on the performance of activated carbon from three categories: plant-based, animal-based and microbial-based. Finally, the traditional methods of preparing activated carbon and the new preparation methods in recent years were briefly introduced. The problems and challenges of biomass activated carbon were pointed out. Some suggestions were provided to guide the selection of precursors for biomass activated carbon.

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Research Progress of Lignin-based Porous Carbon Materials and Its Applications in Water Purification
Can JIN, Yunlong LIU, Shuping HUO, Guomin WU, Guifeng LIU, Zhenwu KONG
Chemistry and Industry of Forest Products    2021, 41 (4): 111-123.   DOI: 10.3969/j.issn.0253-2417.2021.04.015
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Due to the excellent physical and chemical properties such as high specific surface area, large porous volume and adjustable structure morphology, porous carbon materials have been proven to show outstanding adsorption performance for water pollutants. Lignin is a kind of natural and abundant biomass resource. It has the characteristics of high carbon content, low cost, and easy to modification. Thus, it has been regarded as an ideal precursor for replacing traditional fossil resources to prepare porous carbon materials. This review focuses on the preparation methods of lignin-based porous carbon materials and the application research progress in the adsorption and degradation of heavy metal ions, dyes, aromatic compounds, and antibiotics from water. Based on the problems existing in the application of water purification treatment, the development trend of lignin-based porous carbon materials is also prospected.

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Preparation of Cellulose Nanofibril by the Pretreatment with Deep Eutectic Solvent System
Guangrui MA, Ming HE, Guihua YANG, Weidong LI, Xingxiang JI, Jiachuan CHEN
Chemistry and Industry of Forest Products    2021, 41 (4): 69-76.   DOI: 10.3969/j.issn.0253-2417.2021.04.010
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A choline chloride-urea(molar ratio of 1:2) based deep eutectic solvent(DES) system was used as a non-hydrolytic pretreatment media to prepare the cellulose nanofibrils(CNF) from bleached kraft poplar pulp by using microfluidizer. The properties of CNF were characterized by elemental analysis, scanning electron microscope(SEM), Fourier transform infrared spectroscopy(FT-IR), thermogravimetric analysis and X-ray diffraction analysis. Furthermore, the polymerization degree(DP) of CNF and the energy consumption were calculated. The results showed that DES pretreatment could promote the swelling of pulp fibers, which was beneficial to fibrillation during the microfluidization process. The microfluidization treatment, was performed 15 times. It was found that compared with the energy consumption(4.35×107 kW·h/t) of raw materials without DES pretreatment, the energy consumption(2.44×107 kW·h/t) of raw materials with DES pretreatment decreased by 43.91%. whereas the crystallinity indexes(ICr) of CNF prepared before and after pretreatment were 54% and 44%, respectively. However, DES pretreatment had no obvious effect on the polymerization degree of fiber raw materials. DES pretreatment also reduced the thermal stability of CNF. The increase of homogenization times could promote the fibrillation of fibers, and reduce the crystallinity and polymerization degree of cellulose at the same time. FT-IR analysis showed that choline cations interacted with anionic groups of cellulose fibers through static electricity during DES pretreatment. Elemental analysis showed that nitrogen-containing residues remained in CNFs.

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Preparation and Application of Lignin-based Intumescent Flame Retardant
Mengke LIANG, Jing CHEN, Peng DAI, Xiaofeng MA, Meng ZHANG, Zhenyang LUO
Chemistry and Industry of Forest Products    2021, 41 (4): 10-16.   DOI: 10.3969/j.issn.0253-2417.2021.04.002
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Lignin-based intumescent flame retardant(Lig-T) with carbon source, acid source and gas source was synthesized successfully by grafting nitrogen and phosphorus elements. The structure of the flame retardant Lig-T was proved by Fourier transform infrared spectrometer(FT-IR), elements analysis and X-ray photoelectron spectroscopy(XPS). The Lig-T was added to the epoxy resin with different mass fractions to obtain Lig-T/EP composite material. Thermogravimetric analysis, underwriters laboratories 94(UL-94) vertical buring test, oxygen index(LOI) test and cone calorimetry(Cone) test were used to investigate the thermal stability and flame retardancy of composite materials. The results showed that when the mass fraction of the Lig-T was 20%, the composite material 20% Lig-T/EP could reach the UL-94 V-0 level, the oxygen index value was as high as 28.5%, and the mass fraction of the residue increased from 14.8% to 20.2%.With the increase of the mass fraction of Lig-T, the total amount of heat release and the total amount of smoke released during the combustion process of the composite material decreased.

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Preparation of Anti-freezing Hydrogel Electrolyte and Its Application in Solid-state Supercapacitors
Gaitong ZHANG, Xiaoli SONG, Fusheng YANG, Jingya NAN, Fuxiang CHU, Chunpeng WANG
Chemistry and Industry of Forest Products    2021, 41 (4): 51-61.   DOI: 10.3969/j.issn.0253-2417.2021.04.008
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An anti-freezing hydrogel electrolyte(SPI-PVA-PAAm/LiCl) was synthesized, in which soybean protein isolates (SPI), ployvinyl alcohol(PVA) and acrylamide(AAm) were used as raw materials, ammonium persulfate(APS) was used as the initiator, N, N'-methylenebisacrylamide(MBAA) was used as the covalent crosslinker, LiCl was used as the electrolyte salt, and N, N, N', N'-tetramethylethylenediamine(TEMED) was used as the accelerator. Under low temperature conditions, the mechanical properties of the hydrogel electrolyte were analyzed, and the electrochemical properties of the solid-state supercapacitor based on this hydrogel electrolyte were investigated. The results showed that the hydrogel electrolyte had excellent anti-freezing propertity, because a certain molar concentration of LiCl reduced the freezing point of pure water in the hydrogel electrolyte and inhibited the crystallization behavior of water molecules. When the environmental temperature was reduced from 25℃ to -20℃, the hydrogel electrolyte still showed good mechanical properties and ionic conductivity. With the increase of the amount of LiCl, the compression performance of the hydrogel electrolyte firstly increased and then decreased, and the ionic conductivity increased. After 10 cycles of 80% compression strain, the stress retention rate, plastic deformation rate and energy loss coefficient of the hydrogel electrolyte with LiCl concentration of 5 mol/L(S-Li-5) were more than 100%, less than 25% and 0.33, respectively. The hydrogel electrolyte with LiCl concentration of 15 mol/L(S-Li-15) and CNTs were used to assemble the solid supercapacitor whose electrochemical performance was evaluated. When the ambient temperature was reduced from 25℃ to -20℃, the specific capacitance of assembled supercapacitor calculated by GCD curve could be maintained above 80%, and 0-70% compression strain could be withstood without damage, and the supercapacitor could still work normally; In addition, when the current density was 8.12 A/g, the capacitance retention rate of the device was higher than 91% after 1 000 cycles at -20℃.

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Co-production of Xylooligosaccharides and Bacillus subtilis from Poplar
Peiyao WEN, Jiaxin YOU, Yong XU, Junhua ZHANG
Chemistry and Industry of Forest Products    2021, 41 (5): 1-7.   DOI: 10.3969/j.issn.0253-2417.2021.05.001
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Acetic acid(AC) hydrolysis and the second-step pretreatment were used to produce xylooligosaccharides(XOS) and enzymatic hydrolysate from poplar. The hydrolysate was used as carbon resource to produce Bacillus subtilis by fermentation. After the poplar was pretreated by 5% AC at 170℃ for 30 min, the XOS yield of the pretreatment liquor was 55.8%. In the second-step pretreatment, the order of improvement on enzymatic hydrolysis of AC-pretreated poplar was showed as follows: hydrogen peroxide-acetic acid(HPAC), sodium hydroxide, sodium hydroxide-hydrogen peroxide, γ-valerolactone(GVL), ammonia pretreatment. The AC-pretreated poplar after HPAC pretreatment had the highest digestiability and the glucose yield of the hydrolysate was 72.4%. Specially, Tween 80 could further improve the glucose yield of AC-HPAC-pretreated poplar to 93.8%. The enzymatic hydrolysate obtained from the two-step pretreated poplar was used to produce B. subtilis and the highest viable count of the fermentation liquor could reach 2.1×109 CFU/mL. After fermentation for 11.5 h, the utilizations of glucose and xylose were 95.3% and 25.0%, respectively. The results in this work could guide for the co-production of XOS and B. subtilis from poplar, and provide a reference for the high value-added conversion of poplar.

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Research Advance in Preparation of 2, 5-Furanedioic Acid by Oxidation of 5-Hydroxymethylfurfural over Transition Metal-based Catalysts
Jifeng BAI, Yu YANG, Zhixin JIANG, Manfang CHENG, Lin ZHANG, Jingyun WANG
Chemistry and Industry of Forest Products    2021, 41 (5): 100-112.   DOI: 10.3969/j.issn.0253-2417.2021.05.015
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This article reviews the recent research progress of preparation of 2, 5-furandiformaldehyde(DFF) by the oxidation of 5-hydroxymethylfurfural(HMF) with transition metal-based catalysts. The application of manganese-based, copper-based, vanadium-based, iron/cobalt-based and other catalytic systems in the preparation of DFF by HMF oxidation is mainly introduced. The effects of different reaction conditions on the catalytic performance of the catalyst are analyzed in detail, the reaction mechanism of different catalysts is explained, and the advantages and disadvantages of different catalysts are summarized. In addition, based on the analysis of the existed problems in the current catalyst catalysis process, the development prospects of the transition metal-based catalysts catalyzed by HMF oxidation to prepare DFF are also prospected.

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Preparation and Characterization of Room Temperature Vulcanized Silicone Rubber Cross-linked by TiO 2 Modified Dehydroabietic Acid
Xinxin YANG, Zhaoyu JIANG, He LIU, Xujuan HUANG, Zhaosheng CAI, Shibin SHANG
Chemistry and Industry of Forest Products    2021, 41 (4): 42-50.   DOI: 10.3969/j.issn.0253-2417.2021.04.007
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Dehydroabietic acid(DA) reacted with 3-glycidyloxypropyltriethoxysilane(GTS) to synthesize dehydroabietic acid-based cross-linking agent(DAG), and then DAG was combined with TiO2, catalyst dibutyltin dilaurate, and hydroxyl polysiloxane(PDMS) to fabricate the TiO2 modified dehydroabietic acid cross-linked the room temperature vulcanized silicone rubber(TiO2-DAG/RTVSR). The microscopic morphology, mechanical properties, thermal stability, and hydrophobicity of the samples were investigated. The results showed that DAG and TiO2 were uniformly dispersed in the dehydroabietic acid cross-linked silicone rubber. Compared with DAG/RTVSR-3 obtained by only adding DAG, when the addition of TiO2 was 7%, the tensile strength of the obtained TiO2-DAG/RTVSR-4 increased from 0.65 MPa to 0.98 MPa which increased by 50.8%, and the elongation at break increased from 250% to 317%.The 5% mass loss temperature of silicone rubber increased from 324.5℃ to 338.8℃ as the addition of TiO2 increased from 0% to 7%; and the swelling degree decreased, which indirectly reflected the increase in the degree of cross-linking.The contact angle gradually decreased with the increasing of TiO2 amount. These results indicated that the synergistic effect of dehydroabietic acid with rigid structure and TiO2 into the molecular chain of silicone rubber could effectively enhance the mechanical properties and thermal stability of room temperature vulcanized silicone rubber.In summary, silicone rubber with 7% TiO2 had the best performance.

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Preparation and Corrosion Resistance of Tannin Acid/Toughened Shellac Resin Composite Coating
Chunyin LI, Kun LI, Yanlin SUN, Yiwen LIU, Hong ZHANG, Fuhou LEI
Chemistry and Industry of Forest Products    2021, 41 (4): 1-9.   DOI: 10.3969/j.issn.0253-2417.2021.04.001
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In order to improve the toughness of shellac(SHL) resin, eleostearic acid(EA) was added to shellac resin through Diels-Alder reaction to prepare toughened shellac(TS) resin, and its structure was analyzed by gel chromatography(GPC), infrared spectroscopy(FT-IR) and 13C nuclear magnetic resonance(13C NMR). And then, tannic acid(TA) was added to prepare SHL-TA, and TS-TA composite coating. The effects of TA and EA on the anti-corrosion properties of shellac resin coating were analyzed by electrochemical workstation, neutral salt water resistance and neutral salt spray(NSS) resistance tests. The results showed that the TS modified by EA through the Diels-Alder reaction exhibited good toughness. When the weight ratio of SHL and EA was 1.8:1, the elongation at break of TS-3 coating was as high as 381.81%. In addition, the hydrophobicity of shellac coating was increased by the modification of EA, and its static water contact angle reached 95.01°.The addition of TA could improve the adhesion of the coating on the metal substrate, and the combined action of TA and EA could enhance the anti-corrosion of SHL coating. The best corrosion protection system was TS-3-TA coating. After immersion in 3.5% NaCl for 48 h, the polarization resistance of the coating was still 36.3 kΩ, far more higher than that of other coatings. And the time of neutral salt water resistance and neutral salt spray(NSS) resistance tests of TS-3-TA, which was prepared in alkali system, was 120 h and 168 h.

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Preparation and Slow-release Properties of Cinnamomum cassia Leaves Essential Oil/ β-Cyclodextrin Microcapsules
Guoliang LI, Xiangping LIU
Chemistry and Industry of Forest Products    2021, 41 (4): 35-41.   DOI: 10.3969/j.issn.0253-2417.2021.04.006
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In order to further broaden the application of Cinnamomum cassia leaves essential oil in food, feed and other fields, C. cassia leaves essential oil/β-cyclodextrin microcapsules were prepared by co-precipitation method with β-cyclodextrin as the wall material and C. cassia essential oil as the core material. The preparation conditions of microcapsules were optimized by orthogonal experimental design. Essential oil/β-cyclodextrin microcapsules were characterized by using gas chromatography-mass spectrometry(GC-MS) and Fourier transform infrared spectroscopy(FT-IR).The results showed that the suitable preparation conditions of microcapsules were wall-core ratio 6:1, temperature 50℃, time 4 h and stirring speed 1 000 r/min. The encapsulation efficiency of C. cassia essential oil of the obtained microcapsule was 74.17%. The GC-MS analysis showed that the main compositions of C. cassia essential oil were trans-cinnamaldehyde(81.39%), followed by o-methoxycinnamaldehyde(7.61%) and the main compositions of C. cassia essential oil in the microcapsule were also trans-cinnamaldehyde(78.68%) and o-methoxycinnamaldehyde(9.34%). FT-IR analysis showed that C. cassia leaves essential oil and β-cyclodextrin formed good inclusion complex. C. cassia leaves essential oil/β-cyclodextrin microcapsules had good thermal stability and slow-release properties.

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Research Progress in High-value Utilization of Furfural Residue
Mengyu LI, Peng YANG, Chun CHANG, Zhiyong CHEN, Jiande SONG
Chemistry and Industry of Forest Products    2021, 41 (6): 117-126.   DOI: 10.3969/j.issn.0253-2417.2021.06.015
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Furfural residue is the biomass waste in the process of furfural industrial production. In this paper, the sources and composition characteristics of furfural residue are firstly introduced. On this basis, the researches of furfural residue in the fields of biomass energy, composite materials, fine chemicals and agricultural supplies are reviewed, and the research progress in various application fields is analyzed and summarized. Finally, according to the characteristics of furfural residue, the existing problems and challenges in the application of furfural residue are pointed out and the high-value utilization of furfural residue are also prospected.

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Preparation and Performance of a Bio-based Self-healing Material
Shujie HAO, Meng ZHANG, Lihong HU, Caiying BO, Qi ZHAO, Yonghong ZHOU
Chemistry and Industry of Forest Products    2021, 41 (4): 85-91.   DOI: 10.3969/j.issn.0253-2417.2021.04.012
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Using rosin as raw material, acrylipimaric acid(APA) was synthesized through Diels-Alder reaction and purified, and then the esterification reaction between APA and epoxidized soybean oil(ESO) were performed to prepare a range of APA and ESO copolymer composite materials(APA-ESO) with different molar ratios of carboxyl and epoxy group. The properties of composite materials were characterized by Fourier transform infrared spectroscopy(FT-IR), thermal gravimetric analysis(TGA), dynamic mechanical analysis, mechanical performance analysis and other methods. Because of the rigid structure of APA, the glass transition temperature(Tg) of the composite material was much higher than room temperature. The Tg of APA-ESO1.25 with the molar ratio of carboxyl and epoxy group 1.25 was the highest(85.4℃) and it showed excellent mechanical properties. The tensile strength of APA-ESO1.00 with the molar ratio of 1.00 reached 18.82 MPa. At the same time, the composite materials exhibited excellent self-repair behavior and reprocessing performance. At 180℃, the self-repair efficiency of APA-ESO0.75 with the molar ratio of 0.75 could reach 90.3% at 5 min, and the self-repair efficiency could reach 92.9% at 30 min. Moreover, the composite material APA-ESO1.00 could be reprocessed by hot pressing, and the mechanical properties after reprocessing could reach 89% of the original sample. In addition, APA-ESO1.00 also had a shape memory effect.

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Research Progress of Chemical Constituents and Pharmacological Activity of Elaeagnus Plants
Hongdan ZHUANG, Fengqiu LI, Ruilong LUO, Liqin WANG
Chemistry and Industry of Forest Products    2021, 41 (4): 135-146.   DOI: 10.3969/j.issn.0253-2417.2021.04.017
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Most plants of Elaeagnus genus were widely used as folk medicines, and their fruits are edible. This review summarized the research progress of the chemical constituents of Elaeagnus plants and their biological activities. The main chemical constituents isolated from Elaeagnus plants, such as flavonoids, triterpenes, sterols, alkaloids, lignans and other compounds, were described in detail. The various activities of the compounds or the extracts such as antioxidant, antibacterial, pesticidal activities, etc, were introduced.Finally, the development potential of Elaeagnus plants in the fields of functional food, health care products and pharmaceuticals were summarized. Further research on their chemical constituents and bioactivities were proposed. And this review could provide reference for the rational use of Elaeagnus plants.

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Preparation of Xylooligosaccharides by Xylonic Acid Assisted Hydrolysis of Xylan and Its Separation and Recovery Process
Tian HUANG, Xiaotong ZHANG, Jianglin ZHAO, Jianming GUO, Xin ZHOU, Yong XU
Chemistry and Industry of Forest Products    2021, 41 (5): 8-14.   DOI: 10.3969/j.issn.0253-2417.2021.05.002
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Using reaction temperature, xylonic acid(XA-H) mass fraction and reaction time as independent variables, a response surface design was employed to optimize the yield of xylooligosaccharides(XOS) from acidic hydrolysis of the alkali extraction xylan obtained from corncob. And the Gluconobacter oxydans was used to bio-oxidize by-products xylose to XA-H. Then, XA-H and XOS products were simultaneously separated and recovered by bipolar membrane electrodialysis. The results indicated that the optimal conditions for producing XOS were solid-to-liquid ratio 1:10(g: mL), reaction temperature 170℃, mass fraction of XA-H 6%, and reaction time 22 min. Under the optimum conditions, the yield of XOS was 54.9%, while 18.5 g/L xylose was generated as byproduct. Sequentially, the xylose was converted into XA-H within 12 h with C. oxydans of 4 g/L(massconcentration 18.2 g/L, yield 90.9%) cells, and the total content of XA-H increased from 6% to 7.8%. Finally, the hydrolysate after biooxidation was subjected to electrodialysis for separating the XA-H and XOS; the corresponding recovery rates were 95% and 98%, respectively, the purity of XOS was increased from 30% to 75%.

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Preparation of Multi-doped Activated Carbon Based on Alkali/Thiourea Synergistic Activation
Qiong WANG, Xuan YANG, Zhenghan CAI, Yandan CHEN, Biao HUANG, Guanfeng LIN
Chemistry and Industry of Forest Products    2021, 41 (4): 77-84.   DOI: 10.3969/j.issn.0253-2417.2021.04.011
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N, P and S multi-doped activated carbon was prepared from sunflower straw by the synergistic activation of KOH and thiourea with its own phosphorus element as phosphorus source, thiourea as nitrogen source and sulfur source. The effect of activation temperature on the adsorption performance of doped activated carbon was discussed. The pore structure and surface chemical properties of doped activated carbon were analyzed by nitrogen adsorption desorption isotherm and X-ray photoelectron spectroscopy(XPS); the electrochemical performance of doped activated carbon as electrode material for supercapacitor was investigate by galvanostatic dharge discharge(GCD) and cyclic voltammetry(CV). The results showed that as the increase of activation temperature, the iodine adsorption value of doped activated carbon increased first and then decreased; when the activation temperature was 900℃, the iodine adsorption value reached the maximum(2 080 mg/g). The synergistic activation of alkali and thiourea was beneficial to enhance the specific surface area and total pore volume of doped activated carbon, the specific surface area and total pore volume of doped activated carbon P, T-900, which was obtained under activation temperature 900℃, were 2 517 m2/g and 1.73 cm3/g, respectively. The doped activated carbon P, T-900 contained nitrogen(N), phosphorus(P) and sulfur(S) elements, and their mass fractions were 1.9%, 0.52% and 2.46% respectively. When the current density was 1 A/g, the specific capacitance of P, T-900 reached 259 F/g in 6 mol/L KOH electrolyte. When the current density was 10 A/g, the specific capacitance of P, T-900 reached 230 F/g, and the initial capacitance retention was as high as 88.8%.

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Synthesis, Antibacterial and Anticancer Activity of α-Eleostearic Amides Derivatives
Jiang CHENG, Pujun XIE, Lixin HUANG, Caihong ZHANG
Chemistry and Industry of Forest Products    2021, 41 (5): 38-44.   DOI: 10.3969/j.issn.0253-2417.2021.05.006
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In order to find α-eleostearic acid derivatives with potential biological activity, a series of α-eleostearic amides derived from α-eleostearic acid was synthesized: α-eleostearic-3-methylbenz-amide(3a), α-eleostearic-4-methoxybenz-amide(3b), α-eleostearic-4-trifluoromethbenz-amide(3c), α-eleostearic-4-fluorobenz-amide(3d), α-eleostearic-3-chlorobenz-amide(3e), α-eleostearic-2, 3-dichlorobenz-amide(3f), α-eleostearic-3-methylcyclohexan-amide(3g). The products were confirmed by FT-IR, 1H NMR, 13C NMR and HPLC-MS. The results of biological activity experiments showed that compound 3c had good inhibitory effect on hepatocarcinoma cells HepG2, rectal carcinoma cells DLD-1 and breast cancer cells MCF-7. The 50% inhibition concentration of compound 3f on HepG2 was 55.58 μmol/L, which was similar to the 50% inhibition concentration of 5-fluorouracil. All compounds had inhibitory activity against Staphyloccocus aureus and Escherichia coli. Moreover, compound 3f had preferable antibacterial activity against Staphyloccocus aureus, the 50% inhibition concentration was 0.022 μmol/L, which was similar to ampicillin sodium and had the potential to replace antibiotics in animal feed.

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Research Progress in Inhibiting Repolymerization of Lignin Degradation Intermediates
Mengzhu LI, Ting WANG
Chemistry and Industry of Forest Products    2021, 41 (4): 124-134.   DOI: 10.3969/j.issn.0253-2417.2021.04.016
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The degradation of lignin is freguently accompanied by the repolymerization of its intermediates, which increases the difficulty of further degradation and seriously affects the degradation efficiency of lignin. Therefore, effectively inhibiting the repolymerization of intermediates is the key to improve the degradation efficiency of lignin. Inhibiting repolymerization can achieve the purpose of inhibiting polymerization by changing the reaction path or reaction environment of the lignin degradation system. From the perspective of inhibiting or reducing lignin repolymerization, the thesis summarized three effective methods to increase the degradation rate of lignin by adding inhibitors to the reaction system, shortening the reaction residence time and providing a mild reaction environment.

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