@article{geng_venditti_pawlak_chang_pal_ford_2020, title={Carboxymethylation of hemicellulose isolated from poplar (Populus grandidentata) and its potential in water-soluble oxygen barrier films}, volume={27}, ISSN={0969-0239 1572-882X}, url={http://dx.doi.org/10.1007/s10570-020-02993-2}, DOI={10.1007/s10570-020-02993-2}, number={6}, journal={Cellulose}, publisher={Springer Science and Business Media LLC}, author={Geng, Wenhui and Venditti, Richard A. and Pawlak, Joel J. and Chang, Hou-ming and Pal, Lokendra and Ford, Ericka}, year={2020}, month={Jan}, pages={3359–3377} }
 @article{geng_venditti_pawlak_de assis_gonzalez_phillips_chang_2020, title={Techno-economic analysis of hemicellulose extraction from different types of lignocellulosic feedstocks and strategies for cost optimization}, volume={14}, ISBN={1932-1031}, ISSN={1932-104X 1932-1031}, url={http://dx.doi.org/10.1002/bbb.2054}, DOI={10.1002/bbb.2054}, abstractNote={AbstractHemicellulose is a polymer found abundantly in lignocellulosic feedstocks, with many potential market applications. However, there has yet to be a large‐scale commercial process to isolate hemicellulose from lignocellulosic biomass. A techno‐economic assessment for hemicellulose extraction from sugarcane bagasse, switchgrass, and poplar was made. Two isolation processes after alkaline extraction were considered: (1) producing total hemicellulose and (2) producing hemicellulose A (water‐insoluble fraction) only. In a greenfield scenario, a byproduct of the process is sugar, whereas in a co‐location scenario the biomass after hemicellulose extraction is returned to the pulp mill for its fiber value. Operating costs, capital investment, minimum hemicellulose selling price (MHSP), the effect of input material and product prices along with several other process parameters on the MHSP were determined for each scenario. Co‐location scenarios had a dramatically lower capital cost and MHSP relative to greenfield scenarios. This was due to co‐location scenarios utilizing existing biomass processing and utilities equipment and not requiring a sugar‐production process. Among the three biomasses, hemicellulose extraction from sugarcane bagasse had the lowest MHSP for all scenarios, mainly due to a higher hemicellulose extraction yield. Extraction of hemicellulose A from sugarcane bagasse in a co‐location scenario had a low capital cost of 56 million USD and had a reasonable MHSP of 274 USD/t (metric ton). This research indicates that there is reasonable economic potential for hemicellulose extraction from lignocellulosic biomass for applications to replace starch or as a starting material for the production of xylo‐oligomeric prebiotics. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd}, number={2}, journal={BIOFUELS BIOPRODUCTS & BIOREFINING-BIOFPR}, publisher={Wiley}, author={Geng, Wenhui and Venditti, Richard A. and Pawlak, Joel J. and De Assis, Tiago and Gonzalez, Ronalds W. and Phillips, Richard B. and Chang, Hou-min}, year={2020}, month={Mar}, pages={225–241} }
 @article{geng_narron_jiang_pawlak_chang_park_jameel_venditti_2019, title={The influence of lignin content and structure on hemicellulose alkaline extraction for non-wood and hardwood lignocellulosic biomass}, volume={26}, ISSN={0969-0239 1572-882X}, url={http://dx.doi.org/10.1007/s10570-019-02261-y}, DOI={10.1007/s10570-019-02261-y}, number={5}, journal={Cellulose}, publisher={Springer Science and Business Media LLC}, author={Geng, Wenhui and Narron, Robert and Jiang, Xiao and Pawlak, Joel J. and Chang, Hou-min and Park, Sunkyu and Jameel, Hasan and Venditti, Richard A.}, year={2019}, month={Jan}, pages={3219–3230} }
 @article{geng_jin_jameel_park_2015, title={Strategies to achieve high-solids enzymatic hydrolysis of dilute-acid pretreated corn stover}, volume={187}, ISSN={["1873-2976"]}, DOI={10.1016/j.biortech.2015.03.067}, abstractNote={Three strategies were presented to achieve high solids loading while maximizing carbohydrate conversion, which are fed-batch, splitting/thickening, and clarifier processes. Enzymatic hydrolysis was performed at water insoluble solids (WIS) of 15% using washed dilute-acid pretreated corn stover. The carbohydrate concentration increased from 31.8 to 99.3g/L when the insoluble solids content increased from 5% to 15% WIS, while the final carbohydrate conversion was decreased from 78.4% to 73.2%. For the fed-batch process, a carbohydrate conversion efficiency of 76.8% was achieved when solid was split into 60:20:20 ratio, with all enzymes added first. For the splitting/thickening process, a carbohydrate conversion of 76.5% was realized when the filtrate was recycled to simulate a steady-state process. Lastly, the clarifier process was evaluated and the highest carbohydrate conversion of 81.4% was achieved. All of these results suggests the possibility of enzymatic hydrolysis at high solids to make the overall conversion cost-competitive.}, journal={BIORESOURCE TECHNOLOGY}, author={Geng, Wenhui and Jin, Yongcan and Jameel, Hasan and Park, Sunkyu}, year={2015}, month={Jul}, pages={43–48} }
 @article{geng_huang_jin_song_chang_jameel_2014, title={Comparison of sodium carbonate-oxygen and sodium hydroxide-oxygen pretreatments on the chemical composition and enzymatic saccharification of wheat straw}, volume={161}, ISSN={["1873-2976"]}, DOI={10.1016/j.biortech.2014.03.024}, abstractNote={Pretreatment of wheat straw with a combination of sodium carbonate (Na2CO3) or sodium hydroxide (NaOH) with oxygen (O2) 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 Na2O) up to 12% for Na2CO3 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 Na2CO3–O2 and 71.9% for NaOH–O2 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.}, journal={BIORESOURCE TECHNOLOGY}, author={Geng, Wenhui and Huang, Ting and Jin, Yongcan and Song, Junlong and Chang, Hou-min and Jameel, Hasan}, year={2014}, month={Jun}, pages={63–68} }