@article{jiang_narron_han_park_chang_jameel_2020, title={Tracing Sweetgum Lignin's Molecular Properties through Biorefinery Processing}, volume={13}, ISSN={["1864-564X"]}, DOI={10.1002/cssc.202001125}, abstractNote={Abstract}, number={17}, journal={CHEMSUSCHEM}, author={Jiang, Xiao and Narron, Robert H. and Han, Qiang and Park, Sunkyu and Chang, Hou-min and Jameel, Hasan}, year={2020}, month={Sep}, pages={4613–4623} }
 @article{narron_han_park_chang_jameel_2017, title={Lignocentric analysis of a carbohydrate-producing lignocellulosic biorefinery process}, volume={241}, ISSN={["1873-2976"]}, DOI={10.1016/j.biortech.2017.05.207}, abstractNote={A biologically-based lignocellulosic biorefinery process for obtaining carbohydrates from raw biomass was investigated across six diverse biomasses (three hardwoods & three nonwoods) for the purpose of decoding lignin's influence on sugar production. Acknowledging that lignin could positively alter the economics of an entire process if valorized appropriately, we sought to correlate the chemical properties of lignin within the process to the traditional metrics associated with carbohydrate production-cellulolytic digestibility and total sugar recovery. Based on raw carbohydrate, enzymatic recovery ranged from 40 to 64% w/w and total recovery ranged from 70 to 87% w/w. Using nitrobenzene oxidation to quantify non-condensed lignin structures, it was found that raw hardwoods bearing increasing non-condensed S/V ratios (2.5-5.1) render increasing total carbohydrate recovery from hardwood biomasses. This finding indicates that the chemical structure of hardwood lignin influences the investigated biorefinery process' ability to generate carbohydrates from a given raw hardwood feedstock.}, journal={BIORESOURCE TECHNOLOGY}, author={Narron, Robert H. and Han, Qiang and Park, Sunkyu and Chang, Hou-min and Jameel, Hasan}, year={2017}, month={Oct}, pages={857–867} }
 @article{han_jin_jameel_chang_phillips_park_2015, title={Autohydrolysis Pretreatment of Waste Wheat Straw for Cellulosic Ethanol Production in a Co-located Straw Pulp Mill}, volume={175}, ISSN={["1559-0291"]}, DOI={10.1007/s12010-014-1349-5}, abstractNote={Waste wheat straw (WWS) is the waste product from feedstock preparation process in a straw pulp mill. It has a significant annual production rate and no commercial value has been explored on this material. In this study, waste wheat straw was pretreated using an autohydrolysis process followed by mechanical refining, and the pretreated materials were further enzymatically hydrolyzed to evaluate the total sugar recovery for bioethanol production. Results show that autohydrolysis at 170 °C for 40 min followed by 6000 revolution PFI refining provided the best result in this study, where a total sugar recovery (total sugars in autohydrolysis filtrate and enzymatic hydrolyzate over total carbohydrates on raw WWS) of 70 % at 4 filter paper unit per oven dry gram (FPU/OD g) substrate enzyme charge could be obtained. The economic evaluation of this biorefinery process indicates that cellulosic ethanol production from autohydrolysis of WWS is a very profitable business, with 28.4 % of internal rate of return can be achieved based on current ethanol wholesale price in China.}, number={2}, journal={APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY}, author={Han, Qiang and Jin, Yanbin and Jameel, Hasan and Chang, Hou-min and Phillips, Richard and Park, Sunkyu}, year={2015}, month={Jan}, pages={1193–1210} }
 @article{jiang_han_han_zhou_ma_2015, title={Preparation and characteristics of paper-based biodegradable plastics}, volume={10}, number={2}, journal={BioResources}, author={Jiang, X. and Han, J. and Han, Q. and Zhou, X. F. and Ma, J. X.}, year={2015}, pages={2982–2994} }
 @article{ribas batalha_han_jameel_chang_colodette_borges gomes_2015, title={Production of fermentable sugars from sugarcane bagasse by enzymatic hydrolysis after autohydrolysis and mechanical refining}, volume={180}, ISSN={["1873-2976"]}, DOI={10.1016/j.biortech.2014.12.060}, abstractNote={The autohydrolysis process has been considered a simple, low-cost and environmental friendly technology for generation of sugars from biomass. In order to improve accessibility of enzymes during enzymatic hydrolysis as well as to allow the recovery of hemicellulose in the filtrate, the sugarcane bagasse was pretreated using autohydrolysis followed by a mechanical refining process. The autohydrolysis was carried out in three different conditions. Autohydrolysis at 190 °C for 10 min provided the highest overall sugar (19.2/100 g raw bagasse) in prehydrolyzate. The enzymatic hydrolysis step was performed for all the post-treated solids with and without refining at enzyme loadings of 5 and 10 FPU/g for 96 h. A total of 84.4% of sugar can be recovered from sugarcane bagasse at 180 °C for 20 min with 5 FPU/g enzyme charge. The economic analysis for the proposed method showed that the bioethanol production can have a financial return larger than 12%.}, journal={BIORESOURCE TECHNOLOGY}, author={Ribas Batalha, Larisse Aparecida and Han, Qiang and Jameel, Hasan and Chang, Hou-min and Colodette, Jorge Luiz and Borges Gomes, Fernando Jose}, year={2015}, month={Mar}, pages={97–105} }
 @article{chen_han_venditti_jameel_2015, title={enzymatic hydrolysis of pretreated newspaper having high lignin content for bioethanol production}, volume={10}, DOI={10.15376/biores.10.3.4077-4098}, abstractNote={Recovered papers are suitable biomass sources for conversion into sugars that can be used in bioethanol production. However, paper materials with a high lignin content have been found to be recalcitrant to enzymatic hydrolysis. To address this issue, several biomass pretreatment methods were employed to evaluate their efficiency on the conversion of newspaper with high lignin content to sugar. Autohydrolysis, a hot water treatment, was identified to adversely affect sugar conversion, presumably as a result of pore collapse under high-temperature pretreatment. Flexo ink, used in newspaper printing, had no effect on the enzymatic hydrolysis, with or without autohydrolysis. The ink was still detachable after autohydrolysis, as measured by hyperwashing. Compared to untreated newspaper, separate treatments of either mechanical refining or a non-ionic surfactant (sorbitan polyoxyethylene monooleate) improved the sugar conversion by 10% at enzyme dosages of 2 and 8 FPU/g substrate. The combination of both refining and surfactant resulted in the highest sugar conversions, i.e., 46.3%, 56.7%, and 64.1% at 2, 4, and 8 FPU/g enzyme dosages, respectively. Oxidative pretreatment (oxygen, 100 °C) marginally increased the sugar conversion, whereas alkaline and green liquor (NaCO3 and Na2S) pretreatments (at 160 °C) had either no effect or decreased the sugar conversion. Based on the results of the pretreatments, higher pretreatment temperatures of newsprint negatively impacted subsequent enzyme hydrolysis.}, number={3}, journal={BioResources}, author={Chen, H. and Han, Q. and Venditti, Richard and Jameel, H.}, year={2015}, pages={4077–4098} }
 @article{ertas_han_jameel_2014, title={Acid-catalyzed autohydrolysis of wheat straw to improve sugar recovery}, volume={169}, ISSN={["1873-2976"]}, DOI={10.1016/j.biortech.2014.06.081}, abstractNote={A comparison study of autohydrolysis and acid-catalyzed autohydrolysis of wheat straw was performed to understand the impact of acid addition on overall sugar recovery. Autohydrolysis combined with refining is capable of achieving sugar recoveries in the mid 70s. If the addition of a small amount of acid is capable of increasing the sugar recovery even higher it may be economically attractive. Acetic, sulfuric, hydrochloric and sulfurous acids were selected for acid-catalyzed autohydrolysis pretreatments. Autohydrolysis with no acid at 190 °C showed the highest total sugar in the prehydrolyzate. Enzymatic hydrolysis was performed for all the post-treated solids with and without refining at enzyme loadings of 4 and 10 FPU/g for 96 h. Acid-catalyzed autohydrolysis at 190 °C with sulfurous acid showed the highest total sugar recovery of 81.2% at 4 FPU/g enzyme charge compared with 64.3% at 190 °C autohydrolysis without acid.}, journal={BIORESOURCE TECHNOLOGY}, author={Ertas, Murat and Han, Qiang and Jameel, Hasan}, year={2014}, month={Oct}, pages={1–8} }
 @article{chen_han_daniel_venditti_jameel_2014, title={Conversion of Industrial Paper Sludge to Ethanol: Fractionation of Sludge and Its Impact}, volume={174}, ISSN={0273-2289 1559-0291}, url={http://dx.doi.org/10.1007/s12010-014-1083-z}, DOI={10.1007/s12010-014-1083-z}, abstractNote={Paper sludge is an attractive biomass source for the conversion to ethanol due to its low cost and the lack of severe pretreatment required. Four sludges from pulp and paper operations including both virgin kraft (VK) and recycled and deinking (RD) paper mills were analyzed. A fractionation process using a laboratory screen was utilized to produce a fiber-rich stream for enzymatic hydrolysis. This process removed 82-98 % of the ash with fiber yields from 39 to 69 %. Even though sludges in both non-fractionated and fractionated scenarios were pH-adjusted, total sugar conversion was still improved by 12-27 % by fractionation with 4.5 times less acid required for pH adjustment. Fermentation of the fractionated sludges showed very high ethanol yields. Acid insoluble clay adsorbs 3-5 mg enzyme per gram of clay depending on enzyme dosage. Acid soluble CaCO3 adsorbs about half of the enzyme compared to clay. Fractionation efficiency was also evaluated by testing different size mesh screen openings (100 to 500 mesh). The 400-mesh screen presented the best fiber yield, ash removal and ash fractionation ratio for both VK and RD sludges. The ash-rich streams have a lower C/N ratio than the original sludge which improves its suitability as soil amendment.}, number={6}, journal={Applied Biochemistry and Biotechnology}, publisher={Springer Science and Business Media LLC}, author={Chen, Hui and Han, Qiang and Daniel, Kevin and Venditti, Richard and Jameel, Hasan}, year={2014}, month={Aug}, pages={2096–2113} }
 @article{ertas_han_jameel_chang_2014, title={Enzymatic hydrolysis of autohydrolyzed wheat straw followed by refining to produce fermentable sugars}, volume={152}, ISSN={["1873-2976"]}, DOI={10.1016/j.biortech.2013.11.026}, abstractNote={Wheat straw was pretreated using an autohydrolysis process with different temperatures (160-200 °C) and times (10-20 min) in order to allow the recovery of hemicellulose in the filtrate and help open up the structure of the biomass for improved accessibility of enzymes during enzymatic hydrolysis. Autohydrolysis at 190 °C for 10 min provided the highest overall sugar (12.2/100g raw wheat straw) in the autohydrolysis filtrate and recovered 62.3% of solid residue. Before enzymatic hydrolysis, the pulps obtained from each pretreatment condition were subjected to a refining post-treatment to improve enzyme accessibility. Enzymatic hydrolysis was performed for all the pretreated solids with and without refining post-treatment at the enzyme loadings of 4 and 10 FPU/g oven dry substrate for 96 h. A total of 30.4 g sugars can be recovered from 100g wheat straw at 180 °C for 20 min with 4 FPU/g enzyme charge.}, journal={BIORESOURCE TECHNOLOGY}, author={Ertas, Murat and Han, Qiang and Jameel, Hasan and Chang, Hou-min}, year={2014}, month={Jan}, pages={259–266} }