@article{cho_hong_park_lee_choi_koo_choi_2019, title={Application of Sulfated Tin (IV) Oxide Solid Superacid Catalyst to Partial Coupling Reaction of -Pinene to Produce Less Viscous High-Density Fuel}, volume={12}, ISSN={["1996-1073"]}, DOI={10.3390/en12101905}, abstractNote={Brønsted acid-catalyzed reactions of α-pinene have been studied because of their ability to produce various types of fragrance molecules. Beyond this application, dimeric hydrocarbon products produced from coupling reactions of α-pinene have been suggested as renewable high-density fuel molecules. In this context, this paper presents the application of a sulfated tin(IV) oxide catalyst for the partial coupling reaction of α-pinene from turpentine. Brønsted acid sites inherent in this solid superacid catalyst calcined at 550 °C successfully catalyzed the reaction, giving the largest yield of dimeric products (49.6%) at 120 °C over a reaction time of 4 h. Given that the low-temperature viscosity of the mentioned dimeric products is too high for their use as a fuel in transportation engines, lowering the viscosity is an important avenue of study. Therefore, our partial coupling reaction of α-pinene provides a possible solution as a considerable amount of the isomers of α-pinene still remained after the reaction, which reduces the low-temperature viscosity. On the basis of a comparison of the reaction products, a plausible mechanism for the reaction involving coinstantaneous isomerization and coupling reaction of α-pinene was elucidated.}, number={10}, journal={ENERGIES}, author={Cho, Seong-Min and Hong, Chang-Young and Park, Se-Yeong and Lee, Da-Song and Choi, June-Ho and Koo, Bonwook and Choi, In-Gyu}, year={2019}, month={May} }
 @article{park_cho_kim_hong_kim_ryu_choi_2019, title={Effects of Peracetic Acid and Hydrogen Peroxide Concentration on Kraft Lignin Degradation at Room Temperature}, volume={14}, ISSN={["1930-2126"]}, DOI={10.15376/biores.14.2.4413-4429}, abstractNote={Degradation characteristics of kraft lignin were investigated during peracetic acid (PAA) treatment at room temperature. PAA was prepared by direct mixing of acetic acid (AA) and hydrogen peroxide (HP) at different ratios. At a ratio of AA to HP of 1:1.5 (v/v), undissolved lignin content was the lowest (34.7%). Lignin-derived compounds that were produced from the initial lignin after PAA treatment were detected in the liquid fraction (EA extracts) in small quantities (< below 0.1% of initial lignin), while their species were different depending on mix ratio. It was found that degradation behavior depends on not only PAA, but also HP concentrations. Meanwhile, the lignin-derived products of EA extracts in liquid fractions showed decreased molecular weight and polydispersity compared with the initial lignin. As reaction severity increased, amounts of low-molecular weight lignin in liquid fractions increased. At room temperature, different lignin degradation behavior can be induced by controlling the mix ratio of AA and HP.}, number={2}, journal={BIORESOURCES}, author={Park, Se-Yeong and Cho, Seong-Min and Kim, Jong-Chan and Hong, Changyoung and Kim, Seon-Hong and Ryu, Ga-Hee and Choi, In-Gyu}, year={2019}, month={May}, pages={4413–4429} }
 @article{corbett_hong_venditti_jameel_park_2019, title={Hydrophobic resin treatment of hydrothermal autohydrolysate for prebiotic applications}, volume={9}, ISSN={2046-2069}, url={http://dx.doi.org/10.1039/C9RA06018A}, DOI={10.1039/c9ra06018a}, abstractNote={The production of a high-value xylooligosaccharide (XOS) prebiotic product from lignocellulosic autohydrolysate requires processing for the removal of non-carbohydrate components such as lignin and furfural. In this research, the nature of XOS dissolved in autohydrolysate is evaluated including the XOS degree of polymerization (DP) distribution and potential covalent association between XOS and lignin (LCC). The impact of these factors on the yield of XOS during treatment of Miscanthus autohydrolysate with hydrophobic resin is assessed. Over 30% of the XOS in autohydrolysate was found to be likely associated with lignin (“tied” XOS), all of which was removed during hydrophobic resin treatment along with over 90% of the dissolved lignin. However, loss of dissolved XOS during resin treatment was found to not be due solely to XOS association with lignin. Over 50% of the “free,” non-lignin-associated XOS was also removed by resin treatment. Interaction between “free” XOS and the hydrophobic resin was found to be highly dependent on DP with higher DP XOS being removed far more readily than low DP XOS. Over 80% of dissolved “free” XOS with a DP of six and above (X6+) was removed from autohydrolysate during treatment while only 17% of xylose (X1) was removed. Efforts to understand the interaction between the hydrophobic resin and XOS and to improve the recovery of XOS during hydrophobic resin treatment are presented.}, number={55}, journal={RSC Advances}, publisher={Royal Society of Chemistry (RSC)}, author={Corbett, Derek B. and Hong, Changyoung and Venditti, Richard and Jameel, Hasan and Park, Sunkyu}, year={2019}, pages={31819–31827} }
 @article{choi_park_kim_cho_fang_hong_choi_2019, title={Selective deconstruction of hemicellulose and lignin with producing derivatives by sequential pretreatment process for biorefining concept}, volume={291}, ISSN={["1873-2976"]}, DOI={10.1016/j.biortech.2019.121913}, abstractNote={For improving the economic efficiency of the biorefining concept, selective decomposition and separation of biomass components is indispensable. In this respect, a sequential pretreatment process consisting of liquid hot water treatment and diluted peracetic acid (PAA) treatment was proposed for total utilization of lignocellulosic woody biomass. During the liquid hot water treatment, hemicellulose can be decomposed efficiently without significant loss of cellulose and lignin, implying the possibility for xylooligomer production by thermochemical treatment. In the PAA treatment, lignin was successfully degraded and liquefied using a 50% diluted PAA solvent, suggesting the possibility of dicarboxylic acid production. After the sequential process proposed in this study, the cellulose accessibility to the enzyme could be maximized by inducing selective deconstruction of hemicellulose and lignin.}, journal={BIORESOURCE TECHNOLOGY}, author={Choi, June-Ho and Park, Se-Yeong and Kim, Jong-Hwa and Cho, Seong-Min and Fang, Soo-Kyeong and Hong, Changyoung and Choi, In-Gyu}, year={2019}, month={Nov} }
 @article{hong_corbett_venditti_jameel_park_2019, title={Xylooligosaccharides as prebiotics from biomass autohydrolyzate}, volume={111}, ISSN={0023-6438}, url={http://dx.doi.org/10.1016/j.lwt.2019.05.098}, DOI={10.1016/j.lwt.2019.05.098}, abstractNote={With an increased awareness of health and wellness, prebiotics have received a great amount of attention recently. In this study, autohydrolyzate from hot water treatment of Miscanthus lignocellulosic biomass was evaluated for its prebiotic effect by fermentation of Lactobacillus brevis strain. The cell growth on raw autohydrolyzate-supplemented media was comparable to the sample grown on glucose until an incubation time of 24 h then gradually declined. Autohydrolyzate contains various inhibitors (25.9% of total dissolved solids) and it was determined that dissolved lignin had a significant inhibitory effect to bacterial growth. When the autohydrolyzate was purified using a hydrophobic resin, purified autohydrolyzate exhibited high bacterial growth (cell density (OD 600) of 4.8) and high acid production (7.7 and 3.1 g/L of lactic and acetic acid, respectively), which was comparable with commercial xylooligosaccharides. In conclusion, mixed oligosaccharides in the autohydrolyzate from Miscanthus have considerable potential as a prebiotic and are comparable with commercial xylooligosaccharides derived products.}, journal={LWT}, publisher={Elsevier BV}, author={Hong, Changyoung and Corbett, Derek and Venditti, Richard and Jameel, Hasan and Park, Sunkyu}, year={2019}, month={Aug}, pages={703–710} }
 @article{park_hong_kim_choi_kwon_lee_choi_2018, title={PHOTODEGRADATION OF NATURAL WOOD VENEER AND STUDIES ON ITS COLOR STABILIZATION FOR AUTOMOTIVE INTERIOR MATERIALS}, volume={38}, ISSN={["1532-2319"]}, DOI={10.1080/02773813.2018.1488872}, abstractNote={The aim of this study was to investigate the color and chemical changes of natural wood veneers after ultraviolet (UV) exposure for automotive interior materials. To control the photodegradation, chemical treatments with hydrogen peroxide (H2O2) and sodium hypochlorite (NaClO) solution were applied to the veneer under different concentration conditions. The veneers treated with H2O2 showed strong color changes on the surface after the UV test. On the other hand, the veneers treated with NaClO solution (2–3% concentration) showed excellent color stability compared to the untreated veneer because NaClO partially removed lignin compounds on the veneer surface. NaClO can improve the color stability by destroying the lignin structures. However, 3% NaClO condition was seen to cause surface damage although this treatment condition had the best effect on photoprotection. Therefore, treatment with 2% NaClO was the best condition in this study for against color change and photodegradation caused by UV light.}, number={4}, journal={JOURNAL OF WOOD CHEMISTRY AND TECHNOLOGY}, author={Park, Se-Yeong and Hong, Chang-Young and Kim, Seon-Hong and Choi, June-Ho and Kwon, Ohkyung and Lee, Hyo-Jin and Choi, In-Gyu}, year={2018}, pages={301–312} }