The Experts below are selected from a list of 20091 Experts worldwide ranked by ideXlab platform
Linfeng Yang - One of the best experts on this subject based on the ideXlab platform.
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comparison of Sodium Carbonate pretreatment for enzymatic hydrolysis of wheat straw stem and leaf to produce fermentable sugars
Bioresource Technology, 2013Co-Authors: Ting Huang, Wenhui Geng, Linfeng YangAbstract:The specific characteristics of biomass structure and chemical composition of straw stem and leaf may result in different behavior of pretreatment and enzymatic hydrolysis. In this work, Sodium Carbonate (SC) was employed as a pretreatment to improve the enzymatic digestibility of wheat straw. The chemical composition and enzymatic hydrolysis of wheat straw stem and leaf (sheath included) were investigated comparatively. Most of the polysaccharides are kept in the solid fractions after SC pretreatment, while the stem has better delignification selectivity than leaf at high temperature. The enzymatic hydrolysis efficiency of wheat straw leaf is significantly higher than that of stem. The maximum total sugar yield from SC pretreated leaf was about 16% higher than stem. The results show that Sodium Carbonate is of great potential to be used as a pretreatment for the production of bioethanol from straw handling waste in a straw pulp mill with a low feedstock cost.
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Sodium Carbonate Sodium sulfite pretreatment for improving the enzymatic hydrolysis of rice straw
Industrial Crops and Products, 2013Co-Authors: Linfeng Yang, Jie Cao, Jiangyu MaoAbstract:Abstract The performance of Sodium Carbonate–Sodium sulfite (Na 2 CO 3 –Na 2 SO 3 ) pretreatment on improving the enzymatic hydrolysis of rice straw was investigated. The results indicated that both Na 2 CO 3 and Na 2 SO 3 pretreatments are effective in improving the enzymatic digestibility of rice straw. A higher ratio of Na 2 SO 3 in pretreatment liquor performed better at softening the rice straw through degradation of hemicellulose, delignification, and lignin sulfonation, while it was conserving more polysaccharides during the pretreatment than Na 2 CO 3 . The highest sugar recovery of pretreated rice straw, 74.5%, 82.7%, and 59.5% for total sugar, glucan, and xylan, respectively, was obtained at cellulase loading of 20 FPU/g-cellulose after the pretreatment at 140 °C, chemical charge of 12%, Na 2 CO 3 –Na 2 SO 3 ratio of 0:1 (i.e., only Na 2 SO 3 pretreatment). The corresponding delignification ratio of pretreated solid was 53.4%, and 91.4% of the polysaccharides were conserved. The sugar recovery of only Na 2 CO 3 pretreatment at the ratio of 1:0 was 67.1%, 74.4%, and 53.7% for total sugar, glucan, and xylan, respectively, at 140 °C, chemical charge of 12%, and enzyme loading of 20 FPU/g-cellulose. Its corresponding delignification ratio was 40.3%, and polysaccharides conservation ratio was 88.9%.
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effects of Sodium Carbonate pretreatment on the chemical compositions and enzymatic saccharification of rice straw
Bioresource Technology, 2012Co-Authors: Linfeng Yang, Jie Cao, Houmi Chang, Hasa Jameel, Richard PhillipsAbstract:The effects of Sodium Carbonate (Na(2)CO(3)) pretreatment on the chemical compositions and enzymatic saccharification of rice straw were investigated. The enzymatic digestibility of rice straw is enhanced after pretreatment since pretreated solids show significant delignification with high sugar availability. During pretreatment, an increasing temperature and Na(2)CO(3) charge leads to enhanced delignification, whereas an increased degradation of polysaccharides as well, of which xylan acts more susceptible than glucan. The sugar recovery of enzymatic hydrolysis goes up rapidly with the total titratable alkali (TTA) increasing from 0% to 8%, and then it reaches a plateau. The highest sugar recovery of rice straw after pretreatment, 71.7%, 73.2%, and 76.1% for total sugar, glucan, and xylan, respectively, is obtained at 140°C, TTA 8% and cellulase loading of 20 FPU/g-cellulose. In this condition, the corresponding delignification ratio of pretreated solid is 41.8%, while 95% of glucan and 76% of xylan are conserved.
Wenhui Geng - One of the best experts on this subject based on the ideXlab platform.
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comparison of Sodium Carbonate oxygen and Sodium hydroxide oxygen pretreatments on the chemical composition and enzymatic saccharification of wheat straw
Bioresource Technology, 2014Co-Authors: Ting Huang, Wenhui Geng, Junlong Song, Houmin Chang, Hasa JameelAbstract:Abstract Pretreatment of wheat straw with a combination of Sodium Carbonate (Na 2 CO 3 ) or Sodium hydroxide (NaOH) with oxygen (O 2 ) 0.5 MPa was evaluated for its delignification ability at relatively low temperature 110 °C and for its effect on enzymatic hydrolysis efficiency. In the pretreatment, the increase of alkali charge (as Na 2 O) up to 12% for Na 2 CO 3 and 6% for NaOH, respectively, resulted in enhancement of lignin removal, but did not significantly degrade cellulose and hemicellulose. When the pretreated solid was hydrolyzed with a mixture of cellulases and hemicellulases, the sugar yield increased rapidly with the lignin removal during the pretreatment. A total sugar yield based on dry matter of raw material, 63.8% for Na 2 CO 3 –O 2 and 71.9% for NaOH–O 2 was achieved under a cellulase loading of 20 FPU/g-cellulose. The delignification efficiency and total sugar yield from enzymatic hydrolysis were comparable to the previously reported results at much higher temperature without oxygen.
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comparison of Sodium Carbonate pretreatment for enzymatic hydrolysis of wheat straw stem and leaf to produce fermentable sugars
Bioresource Technology, 2013Co-Authors: Ting Huang, Wenhui Geng, Linfeng YangAbstract:The specific characteristics of biomass structure and chemical composition of straw stem and leaf may result in different behavior of pretreatment and enzymatic hydrolysis. In this work, Sodium Carbonate (SC) was employed as a pretreatment to improve the enzymatic digestibility of wheat straw. The chemical composition and enzymatic hydrolysis of wheat straw stem and leaf (sheath included) were investigated comparatively. Most of the polysaccharides are kept in the solid fractions after SC pretreatment, while the stem has better delignification selectivity than leaf at high temperature. The enzymatic hydrolysis efficiency of wheat straw leaf is significantly higher than that of stem. The maximum total sugar yield from SC pretreated leaf was about 16% higher than stem. The results show that Sodium Carbonate is of great potential to be used as a pretreatment for the production of bioethanol from straw handling waste in a straw pulp mill with a low feedstock cost.
Ting Huang - One of the best experts on this subject based on the ideXlab platform.
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comparison of Sodium Carbonate oxygen and Sodium hydroxide oxygen pretreatments on the chemical composition and enzymatic saccharification of wheat straw
Bioresource Technology, 2014Co-Authors: Ting Huang, Wenhui Geng, Junlong Song, Houmin Chang, Hasa JameelAbstract:Abstract Pretreatment of wheat straw with a combination of Sodium Carbonate (Na 2 CO 3 ) or Sodium hydroxide (NaOH) with oxygen (O 2 ) 0.5 MPa was evaluated for its delignification ability at relatively low temperature 110 °C and for its effect on enzymatic hydrolysis efficiency. In the pretreatment, the increase of alkali charge (as Na 2 O) up to 12% for Na 2 CO 3 and 6% for NaOH, respectively, resulted in enhancement of lignin removal, but did not significantly degrade cellulose and hemicellulose. When the pretreated solid was hydrolyzed with a mixture of cellulases and hemicellulases, the sugar yield increased rapidly with the lignin removal during the pretreatment. A total sugar yield based on dry matter of raw material, 63.8% for Na 2 CO 3 –O 2 and 71.9% for NaOH–O 2 was achieved under a cellulase loading of 20 FPU/g-cellulose. The delignification efficiency and total sugar yield from enzymatic hydrolysis were comparable to the previously reported results at much higher temperature without oxygen.
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comparison of Sodium Carbonate pretreatment for enzymatic hydrolysis of wheat straw stem and leaf to produce fermentable sugars
Bioresource Technology, 2013Co-Authors: Ting Huang, Wenhui Geng, Linfeng YangAbstract:The specific characteristics of biomass structure and chemical composition of straw stem and leaf may result in different behavior of pretreatment and enzymatic hydrolysis. In this work, Sodium Carbonate (SC) was employed as a pretreatment to improve the enzymatic digestibility of wheat straw. The chemical composition and enzymatic hydrolysis of wheat straw stem and leaf (sheath included) were investigated comparatively. Most of the polysaccharides are kept in the solid fractions after SC pretreatment, while the stem has better delignification selectivity than leaf at high temperature. The enzymatic hydrolysis efficiency of wheat straw leaf is significantly higher than that of stem. The maximum total sugar yield from SC pretreated leaf was about 16% higher than stem. The results show that Sodium Carbonate is of great potential to be used as a pretreatment for the production of bioethanol from straw handling waste in a straw pulp mill with a low feedstock cost.
Hasa Jameel - One of the best experts on this subject based on the ideXlab platform.
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comparison of Sodium Carbonate oxygen and Sodium hydroxide oxygen pretreatments on the chemical composition and enzymatic saccharification of wheat straw
Bioresource Technology, 2014Co-Authors: Ting Huang, Wenhui Geng, Junlong Song, Houmin Chang, Hasa JameelAbstract:Abstract Pretreatment of wheat straw with a combination of Sodium Carbonate (Na 2 CO 3 ) or Sodium hydroxide (NaOH) with oxygen (O 2 ) 0.5 MPa was evaluated for its delignification ability at relatively low temperature 110 °C and for its effect on enzymatic hydrolysis efficiency. In the pretreatment, the increase of alkali charge (as Na 2 O) up to 12% for Na 2 CO 3 and 6% for NaOH, respectively, resulted in enhancement of lignin removal, but did not significantly degrade cellulose and hemicellulose. When the pretreated solid was hydrolyzed with a mixture of cellulases and hemicellulases, the sugar yield increased rapidly with the lignin removal during the pretreatment. A total sugar yield based on dry matter of raw material, 63.8% for Na 2 CO 3 –O 2 and 71.9% for NaOH–O 2 was achieved under a cellulase loading of 20 FPU/g-cellulose. The delignification efficiency and total sugar yield from enzymatic hydrolysis were comparable to the previously reported results at much higher temperature without oxygen.
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effects of Sodium Carbonate pretreatment on the chemical compositions and enzymatic saccharification of rice straw
Bioresource Technology, 2012Co-Authors: Linfeng Yang, Jie Cao, Houmi Chang, Hasa Jameel, Richard PhillipsAbstract:The effects of Sodium Carbonate (Na(2)CO(3)) pretreatment on the chemical compositions and enzymatic saccharification of rice straw were investigated. The enzymatic digestibility of rice straw is enhanced after pretreatment since pretreated solids show significant delignification with high sugar availability. During pretreatment, an increasing temperature and Na(2)CO(3) charge leads to enhanced delignification, whereas an increased degradation of polysaccharides as well, of which xylan acts more susceptible than glucan. The sugar recovery of enzymatic hydrolysis goes up rapidly with the total titratable alkali (TTA) increasing from 0% to 8%, and then it reaches a plateau. The highest sugar recovery of rice straw after pretreatment, 71.7%, 73.2%, and 76.1% for total sugar, glucan, and xylan, respectively, is obtained at 140°C, TTA 8% and cellulase loading of 20 FPU/g-cellulose. In this condition, the corresponding delignification ratio of pretreated solid is 41.8%, while 95% of glucan and 76% of xylan are conserved.
Ahado Karami - One of the best experts on this subject based on the ideXlab platform.
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silica Sodium Carbonate catalyzed in water synthesis of novel benzylbarbiturocoumarin derivatives
ChemInform, 2016Co-Authors: Khalil Eskandari, Ahado Karami, Mahnaz Farahi, Vania MouzariAbstract:A green method for the synthesis of novel heterocyclic compounds is achieved using silica Sodium Carbonate as a solid base catalyst.
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silica Sodium Carbonate catalyzed in water synthesis of novel benzylbarbiturocoumarin derivatives
Tetrahedron Letters, 2016Co-Authors: Khalil Eskandari, Ahado Karami, Mahnaz Farahi, Vania MouzariAbstract:Novel benzylbarbiturocoumarins were synthesized under mild conditions in the presence of silica Sodium Carbonate as a supported solid base catalyst. Catalytic condensation between barbituric acid derivatives, aryl aldehydes, and 4-hydroxycoumarin gave the benzylbarbiturocoumarin derivatives in one pot.
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a novel one pot method for highly regioselective synthesis of triazolopyrimidinedicarboxylates using silica Sodium Carbonate
Synlett, 2015Co-Authors: Ahado Karami, Mahnaz Farahi, Zohreh AnakiAbstract:A novel synthesis of dimethyl 4,5-dihydro-5-aryl-[1,2,4]triazolo[1,5- a ]pyrimidine-6,7-dicarboxylates is reported. This methodology consists of the one-pot condensation of 3-amino-1 H -1,2,4-triazole, dimethyl acetylenedicarboxylate, and aryl aldehydes using silica Sodium Carbonate as a solid base catalyst. The use of silica Sodium Carbonate as a heterogeneous reusable catalyst makes this procedure mild, convenient, and environmentally benign.
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novel silica Sodium Carbonate ssc preparation characterization and its first catalytic application to the synthesis of new dihydropyrano 2 3 c pyrazoles
Catalysis Communications, 2014Co-Authors: Khalil Eskandari, Ahado Karami, Saeed KhodabakhshiAbstract:Abstract In this study, a novel and highly efficient catalyst was produced from a reaction between silica chloride and Sodium hydrogen Carbonate. This novel catalyst was named silica Sodium Carbonate (SSC), and was characterized by FT-IR, XRD, XRF and TG-DT analyses, atomic absorption and titration with HCl (0.01 N). Furthermore, herein, the first application of SSC as a green, highly efficient and recyclable catalyst to the synthesis of new 1,4-dihydropyrano[2,3-c]pyrazoles is successfully examined. Compared to the classical reactions for the synthesis of 1,4-dihydropyrano[2,3-c]pyrazoles, the presented procedure using SSC has some advantages than others such as excellent yields of products, short reaction times, green and safety procedure, easy handling and reusability of catalyst.
