Guangxi Key Laboratory of Chemistry and Engineering of Forest Products

Nanning, China

Guangxi Key Laboratory of Chemistry and Engineering of Forest Products

Nanning, China
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Lin G.-S.,Guangxi University | Duan W.-G.,Guangxi University | Yang L.-X.,Guangxi University | Huang M.,Guangxi University | Lei F.-H.,Guangxi Key Laboratory of Chemistry and Engineering of Forest Products
Molecules | Year: 2017

A series of novel myrtenal derivatives bearing 1,2,4-triazole moiety were designed and synthesized by multi-step reactions in an attempt to develop potent antifungal agents. Their structures were confirmed by using UV-vis, FTIR, NMR, and ESI-MS analysis. Antifungal activity of the target compounds was preliminarily evaluated by the in vitro method against Fusarium oxysporum f. sp. cucumerinum, Physalospora piricola, Alternaria solani, Cercospora arachidicola, and Gibberella zeae at 50 μg/mL. Compounds 6c (R = i-Pr), 6l (R = o-NO2 Bn), and 6a (R = Et) exhibited excellent antifungal activity against P. piricola with inhibition rates of 98.2%, 96.4%, and 90.7%, respectively, showing better or comparable antifungal activity than that of the commercial fungicide azoxystrobin with a 96.0% inhibition rate, which served as a positive control. © 2017 The Author(s).


Jiang X.,Fujian Agriculture and forestry University | Wang S.,Fujian Agriculture and forestry University | Ge L.,Fujian Agriculture and forestry University | Lin F.,Fujian Agriculture and forestry University | And 4 more authors.
RSC Advances | Year: 2017

Organic-inorganic hybrid adsorbents based on sepiolite and cellulose were prepared through an easy-to-handle procedure. Hydrogen-bonding existed between the silanol groups (Si-OH) on the sepiolite surface and the hydroxyl groups of the cellulose structure resulting in the formation of hybrid beads with good synergistic effects. Incorporation of the inorganic molecule sepiolite into the renewable polymer cellulose opened an opportunity for the development of alternative environment-friendly adsorbents with improved adsorption efficiency as well as enhanced thermal stability compared with neat cellulose beads. The utility of the obtained sepiolite/cellulose beads was demonstrated by investigating their performance for the removal of malachite green (MG). The maximum adsorption capacity of MG on sepiolite/cellulose beads was close to the calculated results from the Langmuir adsorption isotherm, and the adsorption kinetics followed well to the pseudo-second-order model. © 2017 The Royal Society of Chemistry.


Zhao L.,Guangxi University for Nationalities | Zhao L.,Guangxi Key Laboratory of Chemistry and Engineering of Forest Products | Liu Z.,Guangxi University for Nationalities | Liu Z.,Guangxi Key Laboratory of Chemistry and Engineering of Forest Products
Advanced Materials Research | Year: 2013

Rosin-modified lignosulfonates were prepared according to the following procedure: firstly, sulfomethylation of kraft lignin; secondly, preparation of 2,3-epoxypropyl ester of rosin; thirdly, preparation of modified-rosin lignosulfonates via etherification of sulfomethylated lignin with 2,3-epoxy propyl ester of rosin. Experimental results show that the optimum conditions for synthesis of 2,3-epoxy propyl ester of rosin are as follows: molar ratio for n(rosin): n (epichlorohydrin): n (NaOH) is1:6:1, reaction temperature is 100 °C (for rosin ester) and 75 °C (for 2,3-epoxypropyl ester of rosin, the same below), reaction time is 5.5 h and 3 h respectively. When molar ratio of lignosulfonate to 2,3-epoxypropylester of rosin is 1/5, rosin-modified lignosulfonates were prepared at 55 °C for 4.5 h with pH 11.5. Hydrophilic sulfonic group and the lipophilic adbietic group were incorporated into the molecular structure of kraft lignin via corresponding reactions. The surface tension of 10 g/L aqueous solution of rosin-modified lignosulfonate is 49.3 mN/m. © (2013) Trans Tech Publications, Switzerland.


Yu H.-L.,Beijing Forestry University | Tang Y.,Beijing Forestry University | Tang Y.,GuangXi Key Laboratory of Chemistry and Engineering of Forest Products | Xing Y.,Beijing Forestry University | And 3 more authors.
Bioresource Technology | Year: 2013

A potential commercial pretreatment for furfural residues (FRs) was investigated by using a combination of green liquor and hydrogen peroxide (GL-H2O2). The results showed that 56.2% of lignin removal was achieved when the sample was treated with 0.6g H2O2/g-DS (dry substrate) and 6mL GL/g-DS at 80°C for 3h. After 96h hydrolysis with 18FPU/g-cellulose for cellulase, 27CBU/g-cellulose for β-glucosidase, the glucose yield increased from 71.2% to 83.6%. Ethylenediaminetetraacetic acid was used to reduce the degradation of H2O2, the glucose yield increased to 90.4% after the addition of 1% (w/w). The untreated FRs could bind more easily to cellulase than pretreated FRs could. The structural changes on the surface of sample were characterized by X-ray photoelectron spectroscopy. The results indicated that the surface lignin could be effectively removed during pretreatment, thereby decreasing the enzyme-lignin binding activity. Moreover, the carbonyl from lignin plays an important role in cellulase binding. © 2013 Elsevier Ltd.


Yu H.,Beijing Forestry University | Xing Y.,Beijing Forestry University | Lei F.,GuangXi Key Laboratory of Chemistry and Engineering of Forest Products | Liu Z.,Chunlei Industrial Group Company | And 2 more authors.
Bioresource Technology | Year: 2014

Furfural residues (FRs) were pretreated with ethanol and a green liquor (GL) catalyst to produce fermentable sugar. Anthraquinone (AQ) was used as an auxiliary reagent to improve delignification and reduce cellulose decomposition. The results showed that 42.7% of lignin was removed and 96.5% of cellulose was recovered from substrates pretreated with 1.0. mL. GL/g of dry substrate and 0.4% (w/w) AQ at 140. °C for 1. h. Compared with raw material, ethanol-GL pretreatment of FRs increased the glucose yield from 69.0% to 85.9% after 96. h hydrolysis with 18. FPU/g-cellulose for cellulase, 27. CBU/g-cellulose for β-glucosidase. The Brauner-Emmett-Teller surface area was reduced during pretreatment, which did not inhibit the enzymatic hydrolysis. Owing to the reduced surface area, the unproductive binding of cellulase to lignin was decreased, thus improving the enzymatic hydrolysis. The degree of polymerization of cellulose from FRs was too low to be a key factor for improving enzymatic hydrolysis. © 2014 Elsevier Ltd.


Lin G.-S.,Guangxi University | Ma C.-H.,Guangxi University | Duan W.-G.,Guangxi University | Cen B.,Guangxi University | And 2 more authors.
Holzforschung | Year: 2014

This work is aiming at the preparation of new bioactive compounds from a-pinene as starting material. To this purpose, the intermediates (disubstituted phenyl acylamino thioureas, class G) were cyclized to dithiadiazoles (class H). The intermediates and target compounds were analyzed by Fourier transform infrared, 1H nuclear magnetic resonance (NMR), 13C NMR, and electrospray ionization-mass spectrometry and elemental analysis. The bioassay experiments showed that the compounds G and H have herbicidal, fungicidal, and plant growth-regulating activities. The compounds 2,2'-dimethylphenyl thiadiazole and 3,3'-dimethylphenyl thiadiazole exhibited a growth inhibition activity of 72% and 68% against the root of rape (Brassica campestris L.) at a concentration of 100 μg ml-1 (60-79% inhibition level). The compound 4,4'-dichlorophenyl acylamino thiourea displayed an inhibition activity of 75% against Physalospora piricola at a concentration level of 50 μg ml-1 (60-79% inhibition level). © 2014 Walter de Gruyter GmbH, Berlin/Boston.


PubMed | Beijing Forestry University, GuangXi Key Laboratory of Chemistry and Engineering of Forest Products and Chunlei Industrial Group Company
Type: | Journal: Bioresource technology | Year: 2014

Furfural residues (FRs) were pretreated with ethanol and a green liquor (GL) catalyst to produce fermentable sugar. Anthraquinone (AQ) was used as an auxiliary reagent to improve delignification and reduce cellulose decomposition. The results showed that 42.7% of lignin was removed and 96.5% of cellulose was recovered from substrates pretreated with 1.0 mL GL/g of dry substrate and 0.4% (w/w) AQ at 140C for 1h. Compared with raw material, ethanol-GL pretreatment of FRs increased the glucose yield from 69.0% to 85.9% after 96 h hydrolysis with 18 FPU/g-cellulose for cellulase, 27 CBU/g-cellulose for -glucosidase. The Brauner-Emmett-Teller surface area was reduced during pretreatment, which did not inhibit the enzymatic hydrolysis. Owing to the reduced surface area, the unproductive binding of cellulase to lignin was decreased, thus improving the enzymatic hydrolysis. The degree of polymerization of cellulose from FRs was too low to be a key factor for improving enzymatic hydrolysis.


Yu H.,Beijing Forestry University | You Y.,Beijing Forestry University | Lei F.,GuangXi Key Laboratory of Chemistry and Engineering of Forest Products | Liu Z.,GuangXi Key Laboratory of Chemistry and Engineering of Forest Products | And 2 more authors.
Bioresource Technology | Year: 2015

Green liquor (GL) combined with H2O2 (GL-H2O2) and green liquor (GL) combined with ethanol (GL-ethanol) were chosen for treating sugarcane bagasse. Results showed that the glucose yield (calculated from the glucose content as a percentage of the theoretical glucose available in the substrates)of sugarcane bagasse from GL-ethanol pretreatment (97.7%) was higher than that from GL-H2O2 pretreatment (41.7%) after 72h hydrolysis with 18 filter paper unit (FPU)/g-cellulose for cellulase, 27,175 cellobiase units (CBU)/g-cellulose for β-glucosidase. Furthermore, about 94.1% of xylan was converted to xylose after GL-ethanol pretreatment without additional xylanase, while the xylose yield was only 29.2% after GL-H2O2 pretreatment. Scanning electron microscopy showed that GL-ethanol pretreatment could break up the fiber severely. Moreover, GL-ethanol pretreated substrate was more accessible to cellulase and more hydrophilic than that of GL-H2O2 pretreated. Therefore, GL-ethanol pretreatment is a promising method for improving the overall sugar (glucose and xylan) yield of sugarcane bagasse. © 2015 Published by Elsevier Ltd.


PubMed | Guangxi Key Laboratory of Chemistry and Engineering of Forest Products and Guangxi University
Type: Journal Article | Journal: Molecules (Basel, Switzerland) | Year: 2017

A series of novel myrtenal derivatives bearing 1,2,4-triazole moiety were designed and synthesized by multi-step reactions in an attempt to develop potent antifungal agents. Their structures were confirmed by using UV-vis, FTIR, NMR, and ESI-MS analysis. Antifungal activity of the target compounds was preliminarily evaluated by the in vitro method against


PubMed | Beijing Forestry University, GuangXi Key Laboratory of Chemistry and Engineering of Forest Products and Nanjing Institute for the Comprehensive Utilization of Wild Plant
Type: | Journal: Bioresource technology | Year: 2015

Green liquor (GL) combined with H2O2 (GL-H2O2) and green liquor (GL) combined with ethanol (GL-ethanol) were chosen for treating sugarcane bagasse. Results showed that the glucose yield (calculated from the glucose content as a percentage of the theoretical glucose available in the substrates)of sugarcane bagasse from GL-ethanol pretreatment (97.7%) was higher than that from GL-H2O2 pretreatment (41.7%) after 72h hydrolysis with 18 filter paper unit (FPU)/g-cellulose for cellulase, 27,175 cellobiase units (CBU)/g-cellulose for -glucosidase. Furthermore, about 94.1% of xylan was converted to xylose after GL-ethanol pretreatment without additional xylanase, while the xylose yield was only 29.2% after GL-H2O2 pretreatment. Scanning electron microscopy showed that GL-ethanol pretreatment could break up the fiber severely. Moreover, GL-ethanol pretreated substrate was more accessible to cellulase and more hydrophilic than that of GL-H2O2 pretreated. Therefore, GL-ethanol pretreatment is a promising method for improving the overall sugar (glucose and xylan) yield of sugarcane bagasse.

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