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Lee DS, Cho EJ, Nguyen DT, Song Y, Chang J, Bae HJ. Succinic acid production from softwood with genome-edited Corynebacterium glutamicum using the CRISPR-Cpf1 system. Biotechnol J 2024; 19:e2300309. [PMID: 38180273 DOI: 10.1002/biot.202300309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 12/01/2023] [Accepted: 12/04/2023] [Indexed: 01/06/2024]
Abstract
Corynebacterium glutamicum is a useful microbe that can be used for producing succinic acid under anaerobic conditions. In this study, we generated a knock-out mutant of the lactate dehydrogenase 1 gene (ΔldhA-6) and co-expressed the succinic acid transporter (Psod:SucE- ΔldhA) using the CRISPR-Cpf1 genome editing system. The highly efficient HPAC (hydrogen peroxide and acetic acid) pretreatment method was employed for the enzymatic hydrolysis of softwood (Pinus densiflora) and subsequently utilized for production of succinic acid. Upon evaluating a 1%-5% hydrolysate concentration range, optimal succinic acid production with the ΔldhA mutant was achieved at a 4% hydrolysate concentration. This resulted in 14.82 g L-1 succinic acid production over 6 h. No production of acetic acid and lactic acid was detected during the fermentation. The co-expression transformant, [Psod:SucE-ΔldhA] produced 17.70 g L-1 succinic acid in 6 h. In the fed-batch system, 39.67 g L-1 succinic acid was produced over 48 h. During the fermentation, the strain consumed 100% and 73% of glucose and xylose, respectively. The yield of succinic acid from the sugars consumed was approximately 0.77 g succinic acid/g sugars. These results indicate that the production of succinic acid from softwood holds potential applications in alternative biochemical processes.
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Affiliation(s)
- Dae-Seok Lee
- Bio-energy Research Institute, Chonnam National University, Gwangju, Republic of Korea
| | - Eun Jin Cho
- Bio-energy Research Institute, Chonnam National University, Gwangju, Republic of Korea
| | | | - Younho Song
- Bio-energy Research Institute, Chonnam National University, Gwangju, Republic of Korea
| | - Jihye Chang
- Department of Bioenergy Science and Technology, Chonnam National University, Gwangju, Republic of Korea
| | - Hyeun-Jong Bae
- Bio-energy Research Institute, Chonnam National University, Gwangju, Republic of Korea
- School of Biotechology, Tan Tao University, Long An, Viet Nam
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2
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Hyeon Ka C, Kim S, Jin Cho E. Visible Light-Induced Metal-Free Fluoroalkylations. CHEM REC 2023; 23:e202300036. [PMID: 36942971 DOI: 10.1002/tcr.202300036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 03/02/2023] [Indexed: 03/23/2023]
Abstract
Fluoroalkylation is a crucial synthetic process that enables the modification of molecules with fluoroalkyl groups, which can enhance the properties of compounds and have potential applications in medicine and materials science. The utilization of visible light-induced, metal-free methods is of particular importance as it provides an environmentally friendly alternative to traditional methods and eliminates the potential risks associated with metal-catalyst toxicity. This Account describes our studies on visible light-induced, metal-free fluoroalkylation processes, which include the use of organic photocatalysts or EDA complexes. We have utilized organophotocatalysts such as Nile red, tri(9-anthryl)borane, and an indole-based tetracyclic complex, as well as catalyst-free EDA chemistry through photoactive halogen bond formation or an unconventional transient ternary complex formation with nucleophilic fluoroalkyl source. A variety of π-systems including arenes/heteroarenes, alkenes, and alkynes have been successfully fluoroalkylated under the developed reaction conditions.
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Affiliation(s)
- Cheol Hyeon Ka
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea
| | - Seoyeon Kim
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea
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3
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Sammons RM, Cho EJ, Dalby KN. Identification and biochemical characterization of small molecule inhibitors of ERK2 that target the D-recruitment site. Methods Enzymol 2023; 690:445-499. [PMID: 37858538 PMCID: PMC10950554 DOI: 10.1016/bs.mie.2023.06.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2023]
Abstract
Extracellular signal-regulated kinase (ERK) is the culmination of a mitogen-activated protein kinase cascade that regulates cellular processes like proliferation, migration, and survival. Consequently, abnormal ERK signaling often plays a role in the tumorigenesis and metastasis of numerous cancers. ERK inhibition is a sought-after treatment for cancers, especially since clinically approved drugs that target signaling upstream of ERK often induce acquired resistance. Furthermore, the ERK2 isoform may have a differential role in various cancers from the other canonical isoform, ERK1. We demonstrate that small molecules can inhibit ERK2 catalytic and noncatalytic functions by binding to the D-recruitment site (DRS), a protein-protein interaction site distal to the enzyme active site. Using a fluorescence anisotropy-based high-throughput screening, we identify compounds that bind to the DRS and exhibit dose-dependent inhibition of ERK2 activity and ERK2 phosphorylation. We characterize the dose-dependent potency of ERK2 inhibitors using fluorescence anisotropy-based binding assays, fluorescence-based ERK2 substrate phosphorylation assays, and in vitro ERK2 activation assays. In our example, the binding of a DRS inhibitor can be prevented by mutating the DRS residue Cys-159 to serine, indicating that this residue is essential for the interaction. Resulting inhibitors from this process can be assessed in cellular and in vivo experiments for inhibition of ERK signaling and can be evaluated as potential cancer drugs.
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Affiliation(s)
- R M Sammons
- Targeted Therapeutic Drug Discovery and Development Program, The University of Texas at Austin, Austin, TX, United States
| | - E J Cho
- Targeted Therapeutic Drug Discovery and Development Program, The University of Texas at Austin, Austin, TX, United States
| | - K N Dalby
- Targeted Therapeutic Drug Discovery and Development Program, The University of Texas at Austin, Austin, TX, United States; Division of Chemical Biology & Medicinal Chemistry, College of Pharmacy, The University of Texas at Austin, Austin, TX, United States.
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Cho EJ, Lee YG, Song Y, Kim HY, Nguyen DT, Bae HJ. Converting textile waste into value-added chemicals: An integrated bio-refinery process. Environ Sci Ecotechnol 2023; 15:100238. [PMID: 36785801 PMCID: PMC9918418 DOI: 10.1016/j.ese.2023.100238] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 01/03/2023] [Accepted: 01/04/2023] [Indexed: 06/18/2023]
Abstract
The rate of textile waste generation worldwide has increased dramatically due to a rise in clothing consumption and production. Here, conversion of cotton-based, colored cotton-based, and blended cotton-polyethylene terephthalate (PET) textile waste materials into value-added chemicals (bioethanol, sorbitol, lactic acid, terephthalic acid (TPA), and ethylene glycol (EG)) via enzymatic hydrolysis and fermentation was investigated. In order to enhance the efficiency of enzymatic saccharification, effective pretreatment methods for each type of textile waste were developed, respectively. A high glucose yield of 99.1% was obtained from white cotton-based textile waste after NaOH pretreatment. Furthermore, the digestibility of the cellulose in colored cotton-based textile wastes was increased 1.38-1.75 times because of the removal of dye materials by HPAC-NaOH pretreatment. The blended cotton-PET samples showed good hydrolysis efficiency following PET removal via NaOH-ethanol pretreatment, with a glucose yield of 92.49%. The sugar content produced via enzymatic hydrolysis was then converted into key platform chemicals (bioethanol, sorbitol, and lactic acid) via fermentation or hydrogenation. The maximum ethanol yield was achieved with the white T-shirt sample (537 mL/kg substrate), which was 3.2, 2.1, and 2.6 times higher than those obtained with rice straw, pine wood, and oak wood, respectively. Glucose was selectively converted into sorbitol and LA at a yield of 70% and 83.67%, respectively. TPA and EG were produced from blended cotton-PET via NaOH-ethanol pretreatment. The integrated biorefinery process proposed here demonstrates significant potential for valorization of textile waste.
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Affiliation(s)
- Eun Jin Cho
- Bio-Energy Research Center, Chonnam National University, Gwangju, 500-757, Republic of Korea
| | - Yoon Gyo Lee
- Bio-Energy Research Center, Chonnam National University, Gwangju, 500-757, Republic of Korea
| | - Younho Song
- Bio-Energy Research Center, Chonnam National University, Gwangju, 500-757, Republic of Korea
| | - Ha Yeon Kim
- Department of Bioenergy Science and Technology, Chonnam National University, Gwangju, 500-757, Republic of Korea
| | | | - Hyeun-Jong Bae
- Bio-Energy Research Center, Chonnam National University, Gwangju, 500-757, Republic of Korea
- Department of Bioenergy Science and Technology, Chonnam National University, Gwangju, 500-757, Republic of Korea
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Iqbal N, Ashraf MA, Gul AR, Bae J, Iqbal N, Park TJ, Cho EJ. Construction of a Pentacyclic Framework Enabled by Nickel Catalysis. Org Lett 2023; 25:647-652. [PMID: 36682059 DOI: 10.1021/acs.orglett.2c04228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
We present a novel nickel-catalyzed reaction of indole-tethered 2-alkynylphenol esters with various (hetero)aryl boronic acids, resulting in the synthesis of diversely functionalized pentacyclic benzofurocyclohepta[b]indole derivatives. This unprecedented cascade reaction involves the arylative cyclization of alkynes, nucleophilic attack of the indole moiety on the oxonium ion intermediate, 1,2-alkyl group migration, and aromatization. The synthesized molecules exhibit exceptional cytotoxicity against multiple cancer cell lines while maintaining biocompatibility toward healthy cells.
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Affiliation(s)
- Naeem Iqbal
- Department of Chemistry, University of York, Heslington, York YO10 5DD, United Kingdom
| | - Muhammad Awais Ashraf
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Anam Rana Gul
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Jaehan Bae
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Naila Iqbal
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Tae Jung Park
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
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Ali K, Bera M, Cho EJ. [3,3]-Rearrangements of N-Oxyindoles. Synlett 2023. [DOI: 10.1055/a-2024-4595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The concerted Ag-catalyzed rearrangement of N-indolyl carbonates and esters that affords 3-oxyindole derivatives with high functional group compatibility is presented. In addition, this concerted [3,3]-rearrangement approach could be expanded to the synthesis of phosphonate and sulfonamide derivatives even without using an Ag catalyst. Control experiments suggest that a radical pathway is not involved throughout the rearrangement process.
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Affiliation(s)
- Kashif Ali
- Department of Chemistry, Chung-Ang University, Seoul, Korea (the Republic of)
| | - Milan Bera
- Department of Chemistry, Chung-Ang University, Seoul, Korea (the Republic of)
| | - Eun Jin Cho
- Department of Chemistry, Chung-Ang University, Seoul, Korea (the Republic of)
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Han SS, Thacharon A, Kim J, Chung K, Liu X, Jang W, Jetybayeva A, Hong S, Lee KH, Kim Y, Cho EJ, Kim SW. Boosted Heterogeneous Catalysis by Surface-Accumulated Excess Electrons of Non-Oxidized Bare Copper Nanoparticles on Electride Support. Adv Sci (Weinh) 2023; 10:e2204248. [PMID: 36394076 PMCID: PMC9839873 DOI: 10.1002/advs.202204248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Revised: 10/18/2022] [Indexed: 06/16/2023]
Abstract
Engineering active sites of metal nanoparticle-based heterogeneous catalysts is one of the most prerequisite approaches for the efficient production of chemicals, but the limited active sites and undesired oxidation on the metal nanoparticles still remain as key challenges. Here, it is reported that the negatively charged surface of copper nanoparticles on the 2D [Ca2 N]+ ∙e- electride provides the unrestricted active sites for catalytic selective sulfenylation of indoles and azaindoles with diaryl disulfides. Substantial electron transfer from the electride support to copper nanoparticles via electronic metal-support interactions results in the accumulation of excess electrons at the surface of copper nanoparticles. Moreover, the surface-accumulated excess electrons prohibit the oxidation of copper nanoparticle, thereby maintaining the metallic surface in a negatively charged state and activating both (aza)indoles and disulfides under mild conditions in the absence of any further additives. This study defines the role of excess electrons on the nanoparticle-based heterogeneous catalyst that can be rationalized in versatile systems.
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Affiliation(s)
- Sung Su Han
- Department of ChemistryChung‐Ang UniversitySeoul06974Republic of Korea
| | - Athira Thacharon
- Department of Energy ScienceSungkyunkwan University (SKKU)Suwon16419Republic of Korea
| | - Jun Kim
- Department of ChemistryChung‐Ang UniversitySeoul06974Republic of Korea
| | - Kyungwha Chung
- Department of Energy ScienceSungkyunkwan University (SKKU)Suwon16419Republic of Korea
| | - Xinghui Liu
- Department of Energy ScienceSungkyunkwan University (SKKU)Suwon16419Republic of Korea
| | - Woo‐Sung Jang
- Department of Energy ScienceSungkyunkwan University (SKKU)Suwon16419Republic of Korea
| | - Albina Jetybayeva
- Department of Materials Science and EngineeringKAISTDaejeon34141Republic of Korea
| | - Seungbum Hong
- Department of Materials Science and EngineeringKAISTDaejeon34141Republic of Korea
| | - Kyu Hyoung Lee
- Department of Materials Science and EngineeringYonsei UniversitySeoul03722Republic of Korea
| | - Young‐Min Kim
- Department of Energy ScienceSungkyunkwan University (SKKU)Suwon16419Republic of Korea
| | - Eun Jin Cho
- Department of ChemistryChung‐Ang UniversitySeoul06974Republic of Korea
| | - Sung Wng Kim
- Department of Energy ScienceSungkyunkwan University (SKKU)Suwon16419Republic of Korea
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8
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Kim S, Lee Y, Cho EJ. Photoredox Selective Homocoupling of Propargyl Bromides. J Org Chem 2022; 88:6382-6389. [DOI: 10.1021/acs.joc.2c02063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Seoyeon Kim
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Yunjeong Lee
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
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Abstract
A radical shift toward energy transfer photocatalysis from electron transfer photocatalysis under visible-light photoirradiation is often due to the greener prospects of atom and process economy. Recent advances in energy transfer photocatalysis embrace unique strategies for direct small-molecule activation and sometimes extraordinary chemical bond formation in the absence of additional/sacrificial reagents. Selective energy transfer photocatalysis requires careful selection of substrates and photocatalysts for a perfect match with respect to their triplet energies while having incompatible redox potentials to prevent competitive electron transfer pathways. Substrates containing labile N-O bonds are potential targets for generating reactive key intermediates via photocatalysis to access a variety of functionalized molecules. Typically, the differential electron densities of N and O heteroatoms have been exploited for generation of either N- or O-centered radical intermediates from the functionalized substrates by the electron transfer pathway. However, the latest developments involve direct N-O bond homolysis via energy transfer to generate both N- and O-centered radicals for their subsequent utilization in diverse organic transformations, also in the absence of sacrificial redox reagents. In this Account, we highlight our key contributions in the field of N-O bond activation via energy transfer photocatalysis to generate reactive radical intermediates, with coverage of useful mechanistic insights. More specifically, well-designed N-O bond-containing substrates such as 1,2,4-oxadiazolines, oxime esters, N-indolyl carbonates, and N-enoxybenzotriazoles were successfully utilized in versatile transformations involving selective energy transfer over electron transfer from photocatalysts with high triplet state energy. Direct access to reactive N-, O-, and C-centered (if decarboxylation follows) radical intermediates was achieved for diverse cross-couplings and rearrangement processes. In particular, a variety of open-shell nitrogen reactive intermediates, including N(sp2) and N(sp3) radicals and nitrenes, have been utilized. Notably, diversified transformations of identical substrates have been achieved through careful control of the reaction conditions. 1,2,4-Oxadiazolines were converted into spiro-azolactams through iminyl intermediates in the presence of 1O2, benzimidazoles, or sulfoximines with external sulfoxide reagent through triplet nitrene intermediates under inert conditions. Besides, oxime esters underwent either intramolecular C(sp3)-N radical-radical coupling or intermolecular C(sp3)-N radical-radical coupling by a combined energy transfer-hydrogen atom transfer strategy. Furthermore, a series of electrochemical and photophysical experiments as well as computational studies were performed to substantiate the proposed selective energy-transfer-driven reaction pathways. We hope that this Account will serve as a guide for the rational design of selective energy transfer processes through the activation of further labile chemical bonds.
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Affiliation(s)
- Da Seul Lee
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul06974, Republic of Korea
| | - Vineet Kumar Soni
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul06974, Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul06974, Republic of Korea
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Cho EJ, Kang MR, Kim JH, Lee JI, Son ES, Park CH, Aung WW, Lee JS. Evaluation of the MolecuTech ® REBA MTB-XMDR kit for detection of pre-extensively drug-resistant TB. Int J Tuberc Lung Dis 2022; 26:869-874. [PMID: 35996285 DOI: 10.5588/ijtld.21.0606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND: Rapid diagnosis of drug-resistant TB is critical for early initiation of effective therapy. YD Diagnostics in South Korea recently developed the MolecuTech® REBA MTB-XMDR test to rapidly detect multidrug-resistant TB (MDR-TB), pre-extensively drug-resistant TB (pre-XDR-TB) and resistance to second-line injectable drugs (SLIDs) simultaneously using a fully automated test platform. This study aimed to evaluate the MolecuTech® test for the detection of MDR- and pre-XDR-TB, as well as SLID resistance.METHODS: A total of 151 clinical Mycobacterium tuberculosis isolates from South Korea were tested using the MolecuTech test, and the results were analysed by comparing these with phenotypic drug susceptibility testing (pDST) and sequencing.RESULTS: Compared to pDST, the MolecuTech test showed a sensitivity and specificity of respectively 97.7% and 100.0% for rifampicin (RIF), 82.4% and 100.0% for isoniazid (INH), 97.5% and 97.2% for fluoroquinolones (FQs), and 94.0% and 98.8% for SLIDs. Concordances with the sequencing results of each resistance determinant were 99.3% for RIF, 96.7% for INH, 98.7% for FQs and 99.3% for SLIDs.CONCLUSION: The MolecuTech test is an efficient and reliable rapid molecular diagnostic tool for the simultaneous screening of MDR- and pre-XDR-TB.
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Affiliation(s)
- E J Cho
- International Tuberculosis Research Center, Gyeongsangnam-do, College of Health Sciences, Catholic University of Pusan, Busan, Republic of Korea
| | - M R Kang
- YD Diagnostics, Gyeonggi-do, College of Health Sciences, Catholic University of Pusan, Busan, Republic of Korea
| | - J H Kim
- YD Diagnostics, Gyeonggi-do, College of Health Sciences, Catholic University of Pusan, Busan, Republic of Korea, Department of Clinical Laboratory Science, College of Health Sciences, Catholic University of Pusan, Busan, Republic of Korea
| | - J I Lee
- International Tuberculosis Research Center, Gyeongsangnam-do, College of Health Sciences, Catholic University of Pusan, Busan, Republic of Korea
| | - E S Son
- International Tuberculosis Research Center, Gyeongsangnam-do, College of Health Sciences, Catholic University of Pusan, Busan, Republic of Korea
| | - C H Park
- YD Diagnostics, Gyeonggi-do, College of Health Sciences, Catholic University of Pusan, Busan, Republic of Korea, College of Pharmacy, Dongguk University, Seoul, Republic of Korea
| | - W W Aung
- Advanced Molecular Research Centre, Department of Medical Research, Yangon, Myanmar
| | - J S Lee
- International Tuberculosis Research Center, Gyeongsangnam-do, College of Health Sciences, Catholic University of Pusan, Busan, Republic of Korea
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11
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Tambe SD, Cho EJ. Organophotocatalytic oxidation of alcohols to carboxylic acids. B KOREAN CHEM SOC 2022. [DOI: 10.1002/bkcs.12610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Shrikant D. Tambe
- Department of Chemistry Chung‐Ang University Dongjak‐Gu, Seoul Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry Chung‐Ang University Dongjak‐Gu, Seoul Republic of Korea
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Karmakar U, Hwang HS, Lee Y, Cho EJ. Photocatalytic para-Selective C-H Functionalization of Anilines with Diazomalonates. Org Lett 2022; 24:6137-6141. [PMID: 35973228 DOI: 10.1021/acs.orglett.2c02228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Visible-light-induced para-selective C-H functionalization of anilines over N-H insertion was developed using diazomalonates with the help of an Ir(III) photocatalyst. The para-selective radical-radical cross coupling proceeded via C-centered radical intermediates generated from both anilines and diazomalonates. The photochemistry of anilines could be extended to other N-heterocycles, such as indole and carbazole. The reaction pathway for the selective C-C coupling was validated by electrochemical and photophysical experiments as well as computational studies.
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Affiliation(s)
- Ujjwal Karmakar
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Ho Seong Hwang
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Yunjeong Lee
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
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13
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Choi MG, Seo JY, Cho EJ, Chang SK. Colorimetric analysis of palladium using thiocarbamate hydrolysis and its application for detecting residual palladium in drugs. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2022.113920] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Tambe SD, Ka CH, Hwang HS, Bae J, Iqbal N, Cho EJ. Nickel‐Catalyzed Enantioselective Synthesis of 2,3,4‐Trisubstituted 3‐Pyrrolines. Angew Chem Int Ed Engl 2022; 61:e202203494. [DOI: 10.1002/anie.202203494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Indexed: 11/11/2022]
Affiliation(s)
- Shrikant D. Tambe
- Department of Chemistry Chung-Ang University 84 Heukseok-ro Dongjak-gu, Seoul 06974 Republic of Korea
| | - Cheol Hyeon Ka
- Department of Chemistry Chung-Ang University 84 Heukseok-ro Dongjak-gu, Seoul 06974 Republic of Korea
| | - Ho Seong Hwang
- Department of Chemistry Chung-Ang University 84 Heukseok-ro Dongjak-gu, Seoul 06974 Republic of Korea
| | - Jaehan Bae
- Department of Chemistry Chung-Ang University 84 Heukseok-ro Dongjak-gu, Seoul 06974 Republic of Korea
| | - Naeem Iqbal
- Department of Chemistry University of York Heslington, York YO10 5DD UK
| | - Eun Jin Cho
- Department of Chemistry Chung-Ang University 84 Heukseok-ro Dongjak-gu, Seoul 06974 Republic of Korea
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Affiliation(s)
- Quynh H. Nguyen
- Department of Chemistry, Research Institute for Natural Sciences and Center for New Directions in Organic Synthesis (CNOS), Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea
| | - Ho Seong Hwang
- Department of Chemistry, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Seunghoon Shin
- Department of Chemistry, Research Institute for Natural Sciences and Center for New Directions in Organic Synthesis (CNOS), Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea
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16
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Ka CH, Lee DS, Cho EJ. Solvent‐dependent Photochemistry for Diverse and Selective C‐H Functionalization of 2‐tert‐Butyl‐1,4‐Benzoquinones. CHEMPHOTOCHEM 2022. [DOI: 10.1002/cptc.202200136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Cheol Hyeon Ka
- Chung-Ang University - Seoul Campus: Chung-Ang University Chemistry KOREA, REPUBLIC OF
| | - Da Seul Lee
- Chung-Ang University - Seoul Campus: Chung-Ang University Chemistry KOREA, REPUBLIC OF
| | - Eun Jin Cho
- Chung-Ang University Department of Chemistry 84 Heukseok-Ro, Dongjak-Gu 156-756 Seoul KOREA, REPUBLIC OF
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17
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Tambe SD, Ka CH, Hwang HS, Bae J, Iqbal N, Cho EJ. Nickel‐Catalyzed Enantioselective Synthesis of 2,3,4‐Trisubstituted 3‐Pyrrolines. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202203494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Shrikant D. Tambe
- Department of Chemistry Chung-Ang University 84 Heukseok-ro Dongjak-gu, Seoul 06974 Republic of Korea
| | - Cheol Hyeon Ka
- Department of Chemistry Chung-Ang University 84 Heukseok-ro Dongjak-gu, Seoul 06974 Republic of Korea
| | - Ho Seong Hwang
- Department of Chemistry Chung-Ang University 84 Heukseok-ro Dongjak-gu, Seoul 06974 Republic of Korea
| | - Jaehan Bae
- Department of Chemistry Chung-Ang University 84 Heukseok-ro Dongjak-gu, Seoul 06974 Republic of Korea
| | - Naeem Iqbal
- Department of Chemistry University of York Heslington, York YO10 5DD UK
| | - Eun Jin Cho
- Department of Chemistry Chung-Ang University 84 Heukseok-ro Dongjak-gu, Seoul 06974 Republic of Korea
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18
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Affiliation(s)
- Dong Yeun Jeong
- Division of Chemical Engineering and Materials Science, and Graduate Program in System Health Science and Engineering, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Da Seul Lee
- Department of Chemistry, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Ha Lim Lee
- School of Chemical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Sanghee Nah
- Seoul Center, Korea Basic Science Institute (KBSI), Seoul 02841, Republic of Korea
| | - Jun Yeob Lee
- School of Chemical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Youngmin You
- Division of Chemical Engineering and Materials Science, and Graduate Program in System Health Science and Engineering, Ewha Womans University, Seoul 03760, Republic of Korea
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19
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Abstract
A new type of sp3-like N-centered radical has been generated by selective energy transfer catalysis. Upon photoexcitation, homolytic N-O bond cleavage of N-indolyl carbonate in the presence of an Ir complex produced N- and O-centered radicals. The high spin density at the C3 position of indole led to radical recombination with the O-centered radical, affording valuable 3-oxyindole derivatives without decarboxylation. Transformations of the desired products into various molecules were also demonstrated.
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Affiliation(s)
- Milan Bera
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Ho Seong Hwang
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Tae-Woong Um
- Department of Chemistry, Center for New Directions in Organic Synthesis (CNOS), Institute for Natural Sciences, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea
| | - Soo Min Oh
- Department of Chemistry, Center for New Directions in Organic Synthesis (CNOS), Institute for Natural Sciences, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea
| | - Seunghoon Shin
- Department of Chemistry, Center for New Directions in Organic Synthesis (CNOS), Institute for Natural Sciences, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
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20
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Chung K, Bang J, Thacharon A, Song HY, Kang SH, Jang WS, Dhull N, Thapa D, Ajmal CM, Song B, Lee SG, Wang Z, Jetybayeva A, Hong S, Lee KH, Cho EJ, Baik S, Oh SH, Kim YM, Lee YH, Kim SG, Kim SW. Non-oxidized bare copper nanoparticles with surface excess electrons in air. Nat Nanotechnol 2022; 17:285-291. [PMID: 35145286 PMCID: PMC8930766 DOI: 10.1038/s41565-021-01070-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Accepted: 12/23/2021] [Indexed: 06/14/2023]
Abstract
Copper (Cu) nanoparticles (NPs) have received extensive interest owing to their advantageous properties compared with their bulk counterparts. Although the natural oxidation of Cu NPs can be alleviated by passivating the surfaces with additional moieties, obtaining non-oxidized bare Cu NPs in air remains challenging. Here we report that bare Cu NPs with surface excess electrons retain their non-oxidized state over several months in ambient air. Cu NPs grown on an electride support with excellent electron transfer ability are encapsulated by the surface-accumulated excess electrons, exhibiting an ultralow work function of ~3.2 eV. Atomic-scale structural and chemical analyses confirm the absence of Cu oxide moiety at the outermost surface of air-exposed bare Cu NPs. Theoretical energetics clarify that the surface-accumulated excess electrons suppress the oxygen adsorption and consequently prohibit the infiltration of oxygen into the Cu lattice, provoking the endothermic reaction for oxidation process. Our results will further stimulate the practical use of metal NPs in versatile applications.
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Affiliation(s)
- Kyungwha Chung
- Department of Energy Science, Sungkyunkwan University, Suwon, Republic of Korea
| | - Joonho Bang
- Department of Energy Science, Sungkyunkwan University, Suwon, Republic of Korea
| | - Athira Thacharon
- Department of Energy Science, Sungkyunkwan University, Suwon, Republic of Korea
- Center for Integrated Nanostructure Physics, Institute for Basic Science, Suwon, Republic of Korea
| | - Hyun Yong Song
- Department of Energy Science, Sungkyunkwan University, Suwon, Republic of Korea
- Center for Integrated Nanostructure Physics, Institute for Basic Science, Suwon, Republic of Korea
| | - Se Hwang Kang
- Department of Energy Science, Sungkyunkwan University, Suwon, Republic of Korea
- Center for Integrated Nanostructure Physics, Institute for Basic Science, Suwon, Republic of Korea
- Research Institute of Industrial Science and Technology, Pohang, Republic of Korea
| | - Woo-Sung Jang
- Department of Energy Science, Sungkyunkwan University, Suwon, Republic of Korea
| | - Neha Dhull
- Department of Energy Science, Sungkyunkwan University, Suwon, Republic of Korea
- Center for Integrated Nanostructure Physics, Institute for Basic Science, Suwon, Republic of Korea
| | - Dinesh Thapa
- Department of Physics and Astronomy and Center for Computational Sciences, Mississippi State University, Mississippi State, MS, USA
| | - C Muhammed Ajmal
- School of Mechanical Engineering, Sungkyunkwan University, Suwon, Republic of Korea
| | - Bumsub Song
- Department of Energy Science, Sungkyunkwan University, Suwon, Republic of Korea
| | - Sung-Gyu Lee
- Department of Energy Science, Sungkyunkwan University, Suwon, Republic of Korea
- Center for Integrated Nanostructure Physics, Institute for Basic Science, Suwon, Republic of Korea
| | - Zhen Wang
- Department of Energy Science, Sungkyunkwan University, Suwon, Republic of Korea
- Center for Integrated Nanostructure Physics, Institute for Basic Science, Suwon, Republic of Korea
| | - Albina Jetybayeva
- Department of Materials Science and Engineering, KAIST, Daejeon, Republic of Korea
| | - Seungbum Hong
- Department of Materials Science and Engineering, KAIST, Daejeon, Republic of Korea
| | - Kyu Hyoung Lee
- Department of Materials Science and Engineering, Yonsei University, Seoul, Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry, Chung-Ang University, Seoul, Republic of Korea
| | - Seunghyun Baik
- School of Mechanical Engineering, Sungkyunkwan University, Suwon, Republic of Korea
| | - Sang Ho Oh
- Department of Energy Science, Sungkyunkwan University, Suwon, Republic of Korea
- Center for Integrated Nanostructure Physics, Institute for Basic Science, Suwon, Republic of Korea
| | - Young-Min Kim
- Department of Energy Science, Sungkyunkwan University, Suwon, Republic of Korea
- Center for Integrated Nanostructure Physics, Institute for Basic Science, Suwon, Republic of Korea
| | - Young Hee Lee
- Department of Energy Science, Sungkyunkwan University, Suwon, Republic of Korea
- Center for Integrated Nanostructure Physics, Institute for Basic Science, Suwon, Republic of Korea
| | - Seong-Gon Kim
- Department of Physics and Astronomy and Center for Computational Sciences, Mississippi State University, Mississippi State, MS, USA.
| | - Sung Wng Kim
- Department of Energy Science, Sungkyunkwan University, Suwon, Republic of Korea.
- Center for Integrated Nanostructure Physics, Institute for Basic Science, Suwon, Republic of Korea.
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21
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Jin Cho E, Gyo Lee Y, Song Y, Nguyen DT, Bae HJ. An integrated process for conversion of spent coffee grounds into value-added materials. Bioresour Technol 2022; 346:126618. [PMID: 34954357 DOI: 10.1016/j.biortech.2021.126618] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 12/19/2021] [Accepted: 12/20/2021] [Indexed: 06/14/2023]
Abstract
Spent coffee grounds (SCG) are inexpensive materials with a complex composition that makes them promising feedstocks for a biorefinery.Here, conversion of SCG into a wide range of high value-added products (coffee oil, bio-ethanol, D-mannose, manno-oligosaccharide (MOS), cafestol and kahweol) using a novel integrated system was evaluated. The process involves oil extraction, MOS production by mannanase obtained from Penicillium purpurogenum, NaOH (Na) and hydrogen peroxide (HP) pretreatment for the degradation of lignin and phenolic compounds, diterpenes extraction, enzymatic hydrolysis, and fermentation, which can be performed using environmentally friendly technologies. Approximately 97 mL of coffee oil, 164 g of D-mannose, 102 g of MOS, 99 g of bioethanol and a dash of cafestol/kahweol were produced from 1 kg of dry SCG. Producing high-value co-products from SCG using an integrated approach as demonstrated here may be an efficient strategy to reduce waste generation, while improving the economics of the biorefinery production process.
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Affiliation(s)
- Eun Jin Cho
- Bio-Energy Research Center, Chonnam National University, Gwangju 500-757, Republic of Korea
| | - Yoon Gyo Lee
- Department of Bioenergy Science and Technology, Chonnam National University, Gwangju 500-757, Republic of Korea
| | - Younho Song
- Bio-Energy Research Center, Chonnam National University, Gwangju 500-757, Republic of Korea
| | | | - Hyeun-Jong Bae
- Bio-Energy Research Center, Chonnam National University, Gwangju 500-757, Republic of Korea; Department of Bioenergy Science and Technology, Chonnam National University, Gwangju 500-757, Republic of Korea.
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22
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Abstract
A nickel-catalyzed reductive coupling of alkynes and amides, followed by base-free transmetalation, proceeded selectively in the presence of an uncommon bidentate primary aminophosphine ligand to access highly functionalized indoles comprising biologically important trifluoromethyl groups and challenging electron-rich alkenyl groups at the 2- and 3-positions, respectively. Indole molecules were installed within natural products or drug molecules under mild conditions, and a trifluoromethylated analogue of a drug molecule (pravadoline) was also synthesized.
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Affiliation(s)
- Kwan Hong Min
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Naeem Iqbal
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
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Heo S, Chun YS, Bang J, Hwang HS, Hwang S, Kim S, Cho EJ, Kim SW, You Y. Boosting Photoredox Catalysis Using a Two-Dimensional Electride as a Persistent Electron Donor. ACS Appl Mater Interfaces 2021; 13:42880-42888. [PMID: 34464098 DOI: 10.1021/acsami.1c12363] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Electrides, which have excess anionic electrons, are solid-state sources of solvated electrons that can be used as powerful reducing agents for organic syntheses. However, the abrupt decomposition of electrides in organic solvents makes controlling the transfer inefficient, thereby limiting the utilization of their superior electron-donating ability. Here, we demonstrate the efficient reductive transformation strategy which combines the stable two-dimensional [Gd2C]2+·2e- electride electron donor and cyclometalated Pt(II) complex photocatalysts. Strongly localized anionic electrons at the interlayer space in the [Gd2C]2+·2e- electride are released via moderate alcoholysis in 2,2,2-trifluoroethanol, enabling persistent electron donation. The Pt(II) complexes are adsorbed onto the surface of the [Gd2C]2+·2e- electride and rapidly capture the released electrons at a rate of 107 s-1 upon photoexcitation. The one-electron-reduced Pt complex is electrochemically stable enough to deliver the electron to substrates in the bulk, which completes the photoredox cycle. The key benefit of this system is the suppression of undesirable charge recombination because back electron transfer is prohibited due to the irreversible disruption of the electride after the electron transfer. These desirable properties collectively serve as the photoredox catalysis principle for the reductive generation of the benzyl radical from benzyl halide, which is the key intermediate for dehalogenated or homocoupled products.
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Affiliation(s)
- Seunga Heo
- Division of Chemical Engineering and Materials Science, Ewha Womans University, Seoul 03760, Republic of Korea
- Graduate Program in System Health Science and Engineering, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Yu Sung Chun
- Division of Chemical Engineering and Materials Science, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Joonho Bang
- Department of Energy Science, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Republic of Korea
| | - Ho Seong Hwang
- Department of Chemistry, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Sanju Hwang
- Division of Chemical Engineering and Materials Science, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Sonam Kim
- Division of Chemical Engineering and Materials Science, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Sung Wng Kim
- Department of Energy Science, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Republic of Korea
- Center for Integrated Nanostructure Physics, Institute for Basic Science, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Republic of Korea
| | - Youngmin You
- Division of Chemical Engineering and Materials Science, Ewha Womans University, Seoul 03760, Republic of Korea
- Graduate Program in System Health Science and Engineering, Ewha Womans University, Seoul 03760, Republic of Korea
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25
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Abstract
Electrochemistry has recently emerged as a sustainable approach for efficiently generating radical intermediates utilizing eco-friendly electric energy. An electrochemical process was developed to transform 1,2,4-oxadiazolines under mild conditions. The electrochemical N-O bond cleavage at a controlled oxidation potential led to the selective synthesis of quinazolinone derivatives that could not be obtained by photocatalytic radical processes, indicating complementary reactivities in radical processes. The electrochemical reaction pathways were fully revealed by density functional theory-based investigations.
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Affiliation(s)
- Ho Seong Hwang
- Department of Chemistry, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry, Chung-Ang University, Seoul 06974, Republic of Korea
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26
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Iqbal N, Lee DS, Jung H, Cho EJ. Synergistic Effects of Boron and Oxygen Interaction Enabling Nickel-Catalyzed Exogenous Base-Free Stereoselective Arylvinylation of Alkynes through Vinyl Transposition. ACS Catal 2021. [DOI: 10.1021/acscatal.1c00536] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Naeem Iqbal
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro,
Dongjak-gu, Seoul 06974, Republic of Korea
| | - Da Seul Lee
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro,
Dongjak-gu, Seoul 06974, Republic of Korea
| | - Hoimin Jung
- Department of Chemistry, Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro,
Dongjak-gu, Seoul 06974, Republic of Korea
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27
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Ashraf MA, Tambe SD, Cho EJ. Diastereoselective Reductive Cyclization of
Allene‐Tethered
Ketoamines via
Copper‐Catalyzed
Cascade Carboboronation and Protodeborylation. B KOREAN CHEM SOC 2021. [DOI: 10.1002/bkcs.12241] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Muhammad Awais Ashraf
- Department of Chemistry Chung‐Ang University 84 Heukseok‐ro, Dongjak‐gu, Seoul 06974 Republic of Korea
| | - Shrikant D. Tambe
- Department of Chemistry Chung‐Ang University 84 Heukseok‐ro, Dongjak‐gu, Seoul 06974 Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry Chung‐Ang University 84 Heukseok‐ro, Dongjak‐gu, Seoul 06974 Republic of Korea
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Lee DS, Lee YG, Cho EJ, Song Y, Bae HJ. Hydrolysis pattern analysis of xylem tissues of woody plants pretreated with hydrogen peroxide and acetic acid: rapid saccharification of softwood for economical bioconversion. Biotechnol Biofuels 2021; 14:37. [PMID: 33549141 PMCID: PMC7866737 DOI: 10.1186/s13068-021-01889-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Accepted: 01/25/2021] [Indexed: 05/20/2023]
Abstract
BACKGROUND Woody plants with high glucose content are alternative bioresources for the production of biofuels and biochemicals. Various pretreatment methods may be used to reduce the effects of retardation factors such as lignin interference and cellulose structural recalcitrance on the degradation of the lignocellulose material of woody plants. RESULTS A hydrogen peroxide-acetic acid (HPAC) pretreatment was used to reduce the lignin content of several types of woody plants, and the effect of the cellulose structural recalcitrance on the enzymatic hydrolysis was analyzed. The cellulose structural recalcitrance and the degradation patterns of the wood fibers in the xylem tissues of Quercus acutissima (hardwood) resulted in greater retardation in the enzymatic saccharification than those in the tracheids of Pinus densiflora (softwood). In addition to the HPAC pretreatment, the application of supplementary enzymes (7.5 FPU cellulase for 24 h) further increased the hydrolysis rate of P. densiflora from 61.42 to 91.94% whereas the same effect was not observed for Q. acutissima. It was also observed that endoxylanase synergism significantly affected the hydrolysis of P. densiflora. However, this synergistic effect was lower for other supplementary enzymes. The maximum concentration of the reducing sugars produced from 10% softwood was 89.17 g L-1 after 36 h of hydrolysis with 15 FPU cellulase and other supplementary enzymes. Approximately 80 mg mL-1 of reducing sugars was produced with the addition of 7.5 FPU cellulase and other supplementary enzymes after 36 h, achieving rapid saccharification. CONCLUSION HPAC pretreatment removed the interference of lignin, reduced structural recalcitrance of cellulose in the P. densiflora, and enabled rapid saccharification of the woody plants including a high concentration of insoluble substrates with only low amounts of cellulase. HPAC pretreatment may be a viable alternative for the cost-efficient production of biofuels or biochemicals from softwood plant tissues.
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Affiliation(s)
- Dae-Seok Lee
- Bio-Energy Research Center, Chonnam National University, Gwangju, 500-757, Republic of Korea
| | - Yoon-Gyo Lee
- Bio-Energy Research Center, Chonnam National University, Gwangju, 500-757, Republic of Korea
| | - Eun Jin Cho
- Bio-Energy Research Center, Chonnam National University, Gwangju, 500-757, Republic of Korea
| | - Younho Song
- Bio-Energy Research Center, Chonnam National University, Gwangju, 500-757, Republic of Korea
| | - Hyeun-Jong Bae
- Bio-Energy Research Center, Chonnam National University, Gwangju, 500-757, Republic of Korea.
- Department of Bioenergy Science and Technology, College of Agriculture and Life Sciences, Chonnam National University, Gwangju, 500-757, Republic of Korea.
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Choe HR, Han SS, Kim YI, Hong C, Cho EJ, Nam KM. Understanding and Improving Photocatalytic Activity of Pd-Loaded BiVO 4 Microspheres: Application to Visible Light-Induced Suzuki-Miyaura Coupling Reaction. ACS Appl Mater Interfaces 2021; 13:1714-1722. [PMID: 33369380 DOI: 10.1021/acsami.0c15488] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The effective utilization of visible light is required for exploiting photocatalytic reactions in indoor and outdoor environments. In this study, Pd-supported BiVO4 microspheres (Pd-BiVO4) were prepared for visible light-induced photocatalytic reactions. Under irradiation with a white light-emitting diode, the obtained Pd-BiVO4 composite exhibited considerably improved catalytic activity for the decomposition of an organic dye compared with other BiVO4 catalysts. The Pd-BiVO4 composite was also effective for catalytic organic transformation via the visible light-induced Suzuki-Miyaura coupling reaction. The photogenerated electrons in the conduction band of BiVO4 flowed to the Pd nanoparticles and amplified cross-coupling reaction. The influence of the crystal structure and grain size of BiVO4 and the role of the deposited Pd nanoparticles were fully investigated to elucidate the visible light activity of the catalyst. This system highlights the possibility of an indoor light source with low energy density for sustainable organic transformations.
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Affiliation(s)
- Hye Rin Choe
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 46241, Republic of Korea
| | - Sung Su Han
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Yong-Il Kim
- Korea Research Institute of Standards and Science (KRISS), 267 Gajeong, Yuseong, Daejeon 34113, Republic of Korea
| | - Changhyun Hong
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 46241, Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Ki Min Nam
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 46241, Republic of Korea
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30
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Abstract
A Ni-catalyzed reaction was developed for the synthesis of multifunctionalized indoles. The reaction proceeded through oxidative cyclization of the Ni(0)/P^N complex with an enyne system, 2-alkynyl anilinoacrylate, to provide a nickelacycle intermediate. The trans-carboamination around the internal alkyne was achieved by syn/anti-rotation of the Ni-carbenoid intermediate formed by C-N bond cleavage of the nickelacycle, and 3-alkenylated indoles were formed by C-N bond-forming reductive elimination. Notably, the synthesized indoles could be successfully transformed to functionalized carbazoles.
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Affiliation(s)
- Shrikant D Tambe
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Naeem Iqbal
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
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31
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Cho EJ, Lee YG, Chang J, Bae HJ. A High-Yield Process for Production of Biosugars and Hesperidin from Mandarin Peel Wastes. Molecules 2020; 25:E4286. [PMID: 32962056 PMCID: PMC7571014 DOI: 10.3390/molecules25184286] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 09/16/2020] [Accepted: 09/18/2020] [Indexed: 11/16/2022] Open
Abstract
In this research, novel biorefinery processes for obtaining value-added chemicals such as biosugar and hesperidin from mandarin peel waste (MPW) are described. Herein, three different treatment methods were comparatively evaluated to obtain high yields of biosugar and hesperidin from MPW. Each method was determined by changes in the order of three processing steps, i.e., oil removal, hesperidin extraction, and enzymatic hydrolysis. The order of the three steps was found to have a significant influence on the production yields. Biosugar and hesperidin production yields were highest with method II, where the processing steps were performed in the following order: oil removal, enzymatic hydrolysis, and hesperidin extraction. The maximum yields obtained with method II were 34.46 g of biosugar and 6.48 g of hesperidin per initial 100 g of dry MPW. Therefore, the methods shown herein are useful for the production of hesperidin and biosugar from MPW. Furthermore, the utilization of MPWs as sources of valuable materials may be of considerable economic benefits and has become increasingly attractive.
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Affiliation(s)
- Eun Jin Cho
- Bio-energy Research Center, Chonnam National University, Gwangju 61186, Korea;
| | - Yoon Gyo Lee
- Department of Bioenergy science and Technology, Chonnam National University, Gwangju 61186, Korea; (Y.G.L.); (J.C.)
| | - Jihye Chang
- Department of Bioenergy science and Technology, Chonnam National University, Gwangju 61186, Korea; (Y.G.L.); (J.C.)
| | - Hyeun-Jong Bae
- Bio-energy Research Center, Chonnam National University, Gwangju 61186, Korea;
- Department of Bioenergy science and Technology, Chonnam National University, Gwangju 61186, Korea; (Y.G.L.); (J.C.)
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32
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Hwang HS, Lee S, Han SS, Moon YK, You Y, Cho EJ. Benzothiazole Synthesis: Mechanistic Investigation of an In Situ-Generated Photosensitizing Disulfide. J Org Chem 2020; 85:11835-11843. [PMID: 32822174 DOI: 10.1021/acs.joc.0c01598] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The use of a visible light absorbing intermediate as a photosensitizer makes a chemical process simple and sustainable, obviating the need for the use of chemical additives. Herein, the formation of a photosensitizing disulfide in benzothiazole synthesis from 2-aminothiophenol and aldehydes was proposed and confirmed through in-depth mechanistic studies. A series of photophysical and electrochemical investigations revealed that an in situ-generated disulfide photosensitizes molecular oxygen to generate the key oxidants, singlet oxygen and superoxide anion, for the dehydrogenation step.
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Affiliation(s)
- Ho Seong Hwang
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Sumin Lee
- Division of Chemical Engineering and Materials Science, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Sung Su Han
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Yu Kyung Moon
- Division of Chemical Engineering and Materials Science, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Youngmin You
- Division of Chemical Engineering and Materials Science, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
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Kang J, Hwang HS, Soni VK, Cho EJ. Direct C(sp3)–N Radical Coupling: Photocatalytic C–H Functionalization by Unconventional Intermolecular Hydrogen Atom Transfer to Aryl Radical. Org Lett 2020; 22:6112-6116. [DOI: 10.1021/acs.orglett.0c02179] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jihee Kang
- Department of Chemistry, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Ho Seong Hwang
- Department of Chemistry, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Vineet Kumar Soni
- Department of Chemistry, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry, Chung-Ang University, Seoul 06974, Republic of Korea
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Tambe SD, Min KH, Iqbal N, Cho EJ. Distinctive reactivity of N-benzylidene-[1,1'-biphenyl]-2-amines under photoredox conditions. Beilstein J Org Chem 2020; 16:1335-1342. [PMID: 32595781 PMCID: PMC7308614 DOI: 10.3762/bjoc.16.114] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Accepted: 06/02/2020] [Indexed: 12/28/2022] Open
Abstract
A simple photocatalytic method was developed for the synthesis of unsymmetrical 1,2-diamines by the unprecedented reductive coupling of N-benzylidene-[1,1'-biphenyl]-2-amines with an aliphatic amine. The presence of a phenyl substituent in the aniline moiety of the substrate was critical for the reactivity. The reaction proceeded via radical–radical cross-coupling of α-amino radicals generated by proton-coupled single-electron transfer in the presence of an Ir photocatalyst. On the other hand, symmetrical 1,2-diamines were selectively produced from the same starting materials by the judicious choice of the reaction conditions, showcasing the distinct reactivity of N-benzylidene-[1,1'-biphenyl]-2-amines. The developed method can be employed for the synthesis of various bulky vicinal diamines, which are potential ligands in stereoselective synthesis.
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Affiliation(s)
- Shrikant D Tambe
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Kwan Hong Min
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Naeem Iqbal
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
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35
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Cho EJ, Nguyen QA, Lee YG, Song Y, Park BJ, Bae HJ. Enhanced Biomass Yield of and Saccharification in Transgenic Tobacco Over-Expressing β-Glucosidase. Biomolecules 2020; 10:E806. [PMID: 32456184 PMCID: PMC7278181 DOI: 10.3390/biom10050806] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 05/21/2020] [Accepted: 05/21/2020] [Indexed: 11/16/2022] Open
Abstract
Here, we report an increase in biomass yield and saccharification in transgenic tobacco plants (Nicotiana tabacumL.) overexpressing thermostable β-glucosidase from Thermotoga maritima, BglB, targeted to the chloroplasts and vacuoles. The transgenic tobacco plants showed phenotypic characteristics that were significantly different from those of the wild-type plants. The biomass yield and life cycle (from germination to flowering and harvest) of the transgenic tobacco plants overexpressing BglB were 52% higher and 36% shorter than those of the wild-type tobacco plants, respectively, indicating a change in the genome transcription levels in the transgenic tobacco plants. Saccharification in biomass samples from the transgenic tobacco plants was 92% higher than that in biomass samples from the wild-type tobacco plants. The transgenic tobacco plants required a total investment (US$/year) corresponding to 52.9% of that required for the wild-type tobacco plants, but the total biomass yield (kg/year) of the transgenic tobacco plants was 43% higher than that of the wild-type tobacco plants. This approach could be applied to other plants to increase biomass yields and overproduce β-glucosidase for lignocellulose conversion.
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Affiliation(s)
- Eun Jin Cho
- Bio-Energy Research Center, Chonnam National University, Gwangju 61186, Korea; (E.J.C.); (Q.A.N.); (Y.S.)
| | - Quynh Anh Nguyen
- Bio-Energy Research Center, Chonnam National University, Gwangju 61186, Korea; (E.J.C.); (Q.A.N.); (Y.S.)
| | - Yoon Gyo Lee
- Department of Bioenergy science and Technology, Chonnam National University, Gwangju 61186, Korea;
| | - Younho Song
- Bio-Energy Research Center, Chonnam National University, Gwangju 61186, Korea; (E.J.C.); (Q.A.N.); (Y.S.)
| | - Bok Jae Park
- Division of Business and Commerce, Chonnam National University, Yeosu 500-749, Korea;
| | - Hyeun-Jong Bae
- Bio-Energy Research Center, Chonnam National University, Gwangju 61186, Korea; (E.J.C.); (Q.A.N.); (Y.S.)
- Department of Bioenergy science and Technology, Chonnam National University, Gwangju 61186, Korea;
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36
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Cho EJ, Trinh LTP, Song Y, Lee YG, Bae HJ. Bioconversion of biomass waste into high value chemicals. Bioresour Technol 2020; 298:122386. [PMID: 31740245 DOI: 10.1016/j.biortech.2019.122386] [Citation(s) in RCA: 93] [Impact Index Per Article: 23.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 11/04/2019] [Accepted: 11/06/2019] [Indexed: 05/22/2023]
Abstract
Dwindling petroleum resources and increasing environmental concerns have stimulated the production of platform chemicals via biochemical processes through the use of renewable carbon sources. Various types of biomass wastes, which are biodegradable and vastly underutilized, are generated worldwide in huge quantities. They contain diverse chemical constituents, which may serve as starting points for the manufacture of a wide range of valuable bio-derived platform chemicals, intermediates, or end products via different conversion pathways. The valorization of inexpensive, abundantly available, and renewable biomass waste could provide significant benefits in response to increasing fossil fuel demands and manufacturing costs, as well as emerging environmental concerns. This review explores the potential for the use of available biomass waste to produce important chemicals, such as monosaccharides, oligosaccharides, biofuels, bioactive molecules, nanocellulose, and lignin, with a focus on commercially viable technologies.
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Affiliation(s)
- Eun Jin Cho
- Bio-energy Research Center, Chonnam National University, Gwangju 500-757, Republic of Korea
| | - Ly Thi Phi Trinh
- Bio-energy Research Center, Chonnam National University, Gwangju 500-757, Republic of Korea; Research Institute for Biotechnology and Environment, Nong Lam University, Hochiminh City, Viet Nam
| | - Younho Song
- Bio-energy Research Center, Chonnam National University, Gwangju 500-757, Republic of Korea
| | - Yoon Gyo Lee
- Department of Bioenergy Science and Technology, Chonnam National University, Gwangju 500-757, Republic of Korea
| | - Hyeun-Jong Bae
- Bio-energy Research Center, Chonnam National University, Gwangju 500-757, Republic of Korea; Department of Bioenergy Science and Technology, Chonnam National University, Gwangju 500-757, Republic of Korea.
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37
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Park DD, Min KH, Kang J, Hwang HS, Soni VK, Cho CG, Cho EJ. Transforming Oxadiazolines through Nitrene Intermediates by Energy Transfer Catalysis: Access to Sulfoximines and Benzimidazoles. Org Lett 2020; 22:1130-1134. [PMID: 31985235 DOI: 10.1021/acs.orglett.9b04646] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Subtle differences in reaction conditions facilitated unprecedented photocatalytic reactions of oxadiazolines by energy transfer catalysis. A set of compounds, sulfoximines and benzimidazoles, were ingeniously prepared from oxadiazolines via nitrene intermediates by photocatalytic N-O/C-N bond cleavages. The synthesis of sulfoximines was realized through intermolecular N-S bond formation between nitrene intermediates and sulfoxides, whereas benzimidazoles were obtained via intramolecular aromatic substitution of the nitrene to the tethered aryl substituent.
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Affiliation(s)
- Do Dam Park
- Department of Chemistry , Chung-Ang University , 84 Heukseok-ro , Dongjak-gu, Seoul 06974 , Republic of Korea
| | - Kwan Hong Min
- Department of Chemistry , Chung-Ang University , 84 Heukseok-ro , Dongjak-gu, Seoul 06974 , Republic of Korea
| | - Jihee Kang
- Department of Chemistry , Chung-Ang University , 84 Heukseok-ro , Dongjak-gu, Seoul 06974 , Republic of Korea
| | - Ho Seong Hwang
- Department of Chemistry , Chung-Ang University , 84 Heukseok-ro , Dongjak-gu, Seoul 06974 , Republic of Korea
| | - Vineet Kumar Soni
- Department of Chemistry , Chung-Ang University , 84 Heukseok-ro , Dongjak-gu, Seoul 06974 , Republic of Korea
| | - Cheon-Gyu Cho
- Department of Chemistry , Hanyang University , Seoul 04763 , Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry , Chung-Ang University , 84 Heukseok-ro , Dongjak-gu, Seoul 06974 , Republic of Korea
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38
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Rafique R, Gul AR, Lee IG, Baek SH, Kailasa SK, Iqbal N, Cho EJ, Lee M, Park TJ. Photo-induced reactions for disassembling of coloaded photosensitizer and drug molecules from upconversion-mesoporous silica nanoparticles: An effective synergistic cancer therapy. Mater Sci Eng C Mater Biol Appl 2020; 110:110545. [PMID: 32204054 DOI: 10.1016/j.msec.2019.110545] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 11/14/2019] [Accepted: 12/11/2019] [Indexed: 01/31/2023]
Abstract
Photodynamic therapy is an emerging noninvasive cancer treatment approach, which requires a photosensitizer (PS), light, and molecular oxygen. In this study, we have successfully fabricated a dual nature (pH- and reactive-oxygen-species-responsive) upconversion nanoparticles (UCNPs) to utilize coloaded doxorubicin (DOX) and chlorin e6 (Ce6) with high antitumor efficacy. The model anticancer drug (DOX) and PS (Ce6) were conjugated in a ratio of 1:1 (w:w), and then loaded on the surface of UCNPs@mesoporous silica (mSiO2) (85.63 ± 9.87 nm). Cellular uptake could be achieved by either increased permeability or ionic effect of UCNPs@mSiO2, where Ce6 controlled the DOX release under a near-infrared (NIR) laser irradiation at 980 nm. A cytotoxicity analysis revealed that the dual-responsive UCNPs@mSiO2 could successfully deliver DOX and Ce6 at the tumor site, causing cell death with a high efficiency. This study shows that the modified UCNPs@mSiO2 is a promising system to realize NIR-light-triggered PS and drug delivery approach to improve synergistic therapies in vitro and in vivo, in the future.
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Affiliation(s)
- Rafia Rafique
- Department of Chemistry, Institute of Interdisciplinary Convergence Research, Research Institute of Chem-Bio Diagnostic Technology, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Anam Rana Gul
- Department of Chemistry, Institute of Interdisciplinary Convergence Research, Research Institute of Chem-Bio Diagnostic Technology, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - In Gi Lee
- Department of Chemistry, Institute of Interdisciplinary Convergence Research, Research Institute of Chem-Bio Diagnostic Technology, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Seung Hoon Baek
- Department of Chemistry, Institute of Interdisciplinary Convergence Research, Research Institute of Chem-Bio Diagnostic Technology, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Suresh Kumar Kailasa
- Department of Applied Chemistry, Sardar Vallabhbhai National Institute of Technology, Surat 395 007, India
| | - Naeem Iqbal
- Department of Chemistry, Institute of Interdisciplinary Convergence Research, Research Institute of Chem-Bio Diagnostic Technology, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry, Institute of Interdisciplinary Convergence Research, Research Institute of Chem-Bio Diagnostic Technology, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Min Lee
- Division of Advanced Prosthodontics, Weintraub Center for Reconstructive Biotechnology, University of California, Los Angeles, 10833 Le Conte Avenue, CHS 23-088F, Los Angeles, CA 90095-1668, USA
| | - Tae Jung Park
- Department of Chemistry, Institute of Interdisciplinary Convergence Research, Research Institute of Chem-Bio Diagnostic Technology, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea.
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Affiliation(s)
- Da Seul Lee
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro,
Dongjak-gu, Seoul 06974, Republic of Korea
| | - Chung Soo Kim
- Department of Chemistry, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Naila Iqbal
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro,
Dongjak-gu, Seoul 06974, Republic of Korea
| | - Gyeong Su Park
- Department of Chemistry, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Kyung-sun Son
- Department of Chemistry, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro,
Dongjak-gu, Seoul 06974, Republic of Korea
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40
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Nguyen TMT, Cho EJ, Song Y, Oh CH, Funada R, Bae HJ. Use of coffee flower as a novel resource for the production of bioactive compounds, melanoidins, and bio-sugars. Food Chem 2019; 299:125120. [DOI: 10.1016/j.foodchem.2019.125120] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2018] [Revised: 06/27/2019] [Accepted: 07/01/2019] [Indexed: 11/29/2022]
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41
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Soni VK, Lee S, Kang J, Moon YK, Hwang HS, You Y, Cho EJ. Reactivity Tuning for Radical–Radical Cross-Coupling via Selective Photocatalytic Energy Transfer: Access to Amine Building Blocks. ACS Catal 2019. [DOI: 10.1021/acscatal.9b03435] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Vineet Kumar Soni
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro,
Dongjak-gu, Seoul 06974, Republic of Korea
| | - Sumin Lee
- Division of Chemical Engineering and Materials Science, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Jihee Kang
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro,
Dongjak-gu, Seoul 06974, Republic of Korea
| | - Yu Kyung Moon
- Division of Chemical Engineering and Materials Science, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Ho Seong Hwang
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro,
Dongjak-gu, Seoul 06974, Republic of Korea
| | - Youngmin You
- Division of Chemical Engineering and Materials Science, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro,
Dongjak-gu, Seoul 06974, Republic of Korea
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42
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Iqbal N, Iqbal N, Maiti D, Cho EJ. Access to Multifunctionalized Benzofurans by Aryl Nickelation of Alkynes: Efficient Synthesis of the Anti‐Arrhythmic Drug Amiodarone. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201909015] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Naeem Iqbal
- Department of Chemistry Chung-Ang University 84 Heukseok-ro Dongjak-gu Seoul 06974 Republic of Korea
| | - Naila Iqbal
- Department of Chemistry Chung-Ang University 84 Heukseok-ro Dongjak-gu Seoul 06974 Republic of Korea
| | - Debabrata Maiti
- Department of Chemistry Indian Institute of Technology Bombay, Powai Mumbai 400076 India
| | - Eun Jin Cho
- Department of Chemistry Chung-Ang University 84 Heukseok-ro Dongjak-gu Seoul 06974 Republic of Korea
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43
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Iqbal N, Iqbal N, Maiti D, Cho EJ. Access to Multifunctionalized Benzofurans by Aryl Nickelation of Alkynes: Efficient Synthesis of the Anti‐Arrhythmic Drug Amiodarone. Angew Chem Int Ed Engl 2019; 58:15808-15812. [DOI: 10.1002/anie.201909015] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 08/12/2019] [Indexed: 12/22/2022]
Affiliation(s)
- Naeem Iqbal
- Department of Chemistry Chung-Ang University 84 Heukseok-ro Dongjak-gu Seoul 06974 Republic of Korea
| | - Naila Iqbal
- Department of Chemistry Chung-Ang University 84 Heukseok-ro Dongjak-gu Seoul 06974 Republic of Korea
| | - Debabrata Maiti
- Department of Chemistry Indian Institute of Technology Bombay, Powai Mumbai 400076 India
| | - Eun Jin Cho
- Department of Chemistry Chung-Ang University 84 Heukseok-ro Dongjak-gu Seoul 06974 Republic of Korea
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44
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Kim SW, Kim MA, Chang Y, Lee HY, Yoon JS, Lee YB, Cho EJ, Lee JH, Yu SJ, Yoon JH, Park KJ, Kim YJ. Prognosis of surgical hernia repair in cirrhotic patients with refractory ascites. Hernia 2019; 24:481-488. [PMID: 31512088 DOI: 10.1007/s10029-019-02043-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2019] [Accepted: 08/27/2019] [Indexed: 10/26/2022]
Abstract
BACKGROUND Abdominal wall hernias are common in patients with ascites. Elective surgical repair is recommended for the treatment of abdominal wall hernias. However, surgical hernia repair in cirrhotic patients with refractory ascites is controversial. In this study, we aimed to evaluate the outcomes of elective surgical hernia repair in patients with liver cirrhosis with and without refractory ascites. METHOD From January 2005 to June 2018, we retrospectively reviewed the records of consecutive patients with liver cirrhosis who underwent a surgical hernia repair. RESULTS This study included 107 patients; 31 patients (29.0%) had refractory ascites. Preoperatively, cirrhotic patients with refractory ascites had a higher median model for end-stage liver disease (MELD) score (13.0 vs 11.0, P = 0.001) than those without refractory ascites. The 30-day mortality rate (3.2% vs 0%, P = 0.64) and the risk of recurrence (hazard ratio 0.410; 95% CI 0.050-3.220; P = 0.39) did not differ significantly between cirrhotic patients with refractory ascites and cirrhotic patients without refractory ascites. Among cirrhotic patients with refractory ascites, albumin (P = 0.23), bilirubin (P = 0.37), creatinine (P = 0.97), and sodium levels (P = 0.35) did not change significantly after surgery. CONCLUSION In advanced liver cirrhosis patients with refractory ascites, hernias can be safely treated with elective surgical repair. Mortality rate within 30 days did not differ by the presence or absence of refractory ascites. Elective hernia repair might be beneficial for treatment of abdominal wall hernia in cirrhotic patients with refractory ascites.
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Affiliation(s)
- S W Kim
- Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, South Korea
| | - M A Kim
- Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, South Korea
| | - Y Chang
- Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, South Korea
| | - H Y Lee
- Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, South Korea.,Department of Internal Medicine, Eulji General Hospital, Eulji University School of Medicine, Seoul, South Korea
| | - J S Yoon
- Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, South Korea.,Department of Internal Medicine, Busan Paik Hospital, Inje University College of Medicine, Busan, South Korea
| | - Y B Lee
- Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, South Korea
| | - E J Cho
- Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, South Korea
| | - J-H Lee
- Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, South Korea
| | - S J Yu
- Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, South Korea
| | - J-H Yoon
- Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, South Korea
| | - K J Park
- Department of Surgery, Seoul National University College of Medicine, Seoul, South Korea
| | - Y J Kim
- Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, South Korea. .,Department of Internal Medicine, Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul, 03080, South Korea.
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45
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Moon J, Moon YK, Park DD, Choi S, You Y, Cho EJ. Visible-Light-Induced Trifluoromethylation of Unactivated Alkenes with Tri(9-anthryl)borane as an Organophotocatalyst. J Org Chem 2019; 84:12925-12932. [DOI: 10.1021/acs.joc.9b01624] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Jisu Moon
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro,
Dongjak-gu, Seoul 06974, Republic of Korea
| | - Yu Kyung Moon
- Division of Chemical Engineering and Materials Science, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Do Dam Park
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro,
Dongjak-gu, Seoul 06974, Republic of Korea
| | - Sukyung Choi
- Division of Chemical Engineering and Materials Science, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Youngmin You
- Division of Chemical Engineering and Materials Science, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro,
Dongjak-gu, Seoul 06974, Republic of Korea
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46
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Han SS, Park JY, Hwang HS, Choe HR, Nam KM, Cho EJ. Facile Synthesis of BiVO 4 for Visible-Light-Induced C-C Bond Cleavage of Alkenes to Generate Carbonyls. ChemSusChem 2019; 12:3018-3022. [PMID: 30916376 DOI: 10.1002/cssc.201900439] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Revised: 03/13/2019] [Indexed: 06/09/2023]
Abstract
BiVO4 crystals synthesized by an ultrasonic-assisted method (Sono-BiVO4 ) showed improved efficiency as a heterogeneous photocatalyst under visible-light irradiation. Sono-BiVO4 was successfully used for the C-C bond cleavage of alkenes to generate carbonyl compounds. Styrene derivatives were converted into carbonyl compounds in the presence of Sono-BiVO4 under highly sustainable conditions requiring only natural sources, that is, molecular oxygen, visible light, and water at room temperature. Additionally, Sono-BiVO4 could be easily separated from the reaction mixture and reused.
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Affiliation(s)
- Sung Su Han
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea
| | - Joon Yong Park
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan, 46241, Republic of Korea
| | - Ho Seong Hwang
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea
| | - Hye Rin Choe
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan, 46241, Republic of Korea
| | - Ki Min Nam
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan, 46241, Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea
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47
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Soni VK, Hwang HS, Moon YK, Park SW, You Y, Cho EJ. Generation of N-Centered Radicals via a Photocatalytic Energy Transfer: Remote Double Functionalization of Arenes Facilitated by Singlet Oxygen. J Am Chem Soc 2019; 141:10538-10545. [DOI: 10.1021/jacs.9b05572] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Vineet Kumar Soni
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Ho Seong Hwang
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Yu Kyung Moon
- Division of Chemical Engineering and Materials Science, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Sung-Woo Park
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), and Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Youngmin You
- Division of Chemical Engineering and Materials Science, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
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48
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Abstract
A fluoroalkenylation of boronic acids with fluoroalkyl alkenes has been developed. The Pd-catalyzed oxidative Heck coupling reaction proceeds under an oxygen atmosphere at room temperature, in the absence of a base and/or a ligand, showing excellent practicality of the process. This simple transformation is highly stereoselective to provide only E-isomers. In addition to the general approach using alkenes with functionalized fluoroalkyl reagents, this method, by transferring an aromatic system to the electron-deficient fluoroalkyl alkene, provides an efficient alternative method to yield valuable organofluorines.
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Affiliation(s)
- Da Seul Lee
- Department of Chemistry, Chung-Ang University 84 Heukseok-ro, Dongjak-gu Seoul 06974, Republic of Korea.
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49
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Abstract
Fluoroalkylated alkynes, which are versatile building blocks for the synthesis of various biologically active organofluorine compounds, were synthesized from easily available alkynyl halides and fluoroalkyl halides by visible-light photocatalysis.
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Affiliation(s)
- Naila Iqbal
- Department of Chemistry
- Chung-Ang University
- Seoul 06974
- Republic of Korea
| | - Naeem Iqbal
- Department of Chemistry
- Chung-Ang University
- Seoul 06974
- Republic of Korea
| | - Sung Su Han
- Department of Chemistry
- Chung-Ang University
- Seoul 06974
- Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry
- Chung-Ang University
- Seoul 06974
- Republic of Korea
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50
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Nguyen QA, Cho EJ, Lee DS, Bae HJ. Development of an advanced integrative process to create valuable biosugars including manno-oligosaccharides and mannose from spent coffee grounds. Bioresour Technol 2019; 272:209-216. [PMID: 30340187 DOI: 10.1016/j.biortech.2018.10.018] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Revised: 10/04/2018] [Accepted: 10/05/2018] [Indexed: 06/08/2023]
Abstract
Spent coffee grounds (SCG) or coffee residue wastes (CRW) provide excellent raw material for mannose and bioethanol production. In this study, SCG were used to produce valuable biosugars, including oligosaccharides (OSs), manno-oligosaccharides (MOSs), mannose, and bioethanol. SCG were subjected to delignification and defatting, producing SCG-derived polysaccharides. Two-stage enzymatic hydrolysis (short- and long-term) was performed to produce short-chain manno-oligosaccharides (MOSs) and monosaccharides (MSs), respectively. From 100 g dry weight (DW) amounts of SCG, approximately 77 g delignified SCG and 61 g SCG-derived polysaccharides, amounts of 15.9 g of first biosugars (mostly MOSs), 25.6 g of second biosugars (mostly MSs), and 3.1 g of bioethanol, were recovered. This technique may aid in the production of high-value mannose and OSs from SCG and other lignocellulosic biomasses that contain specific polysaccharides.
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Affiliation(s)
- Quynh Anh Nguyen
- Bio-Energy Research Center, Chonnam National University, Gwangju 500-757, Republic of Korea
| | - Eun Jin Cho
- Bio-Energy Research Center, Chonnam National University, Gwangju 500-757, Republic of Korea
| | - Dae-Seok Lee
- Bio-Energy Research Center, Chonnam National University, Gwangju 500-757, Republic of Korea
| | - Hyeun-Jong Bae
- Bio-Energy Research Center, Chonnam National University, Gwangju 500-757, Republic of Korea; Department of Bioenergy Science and Technology, Chonnam National University, Gwangju 500-757, Republic of Korea.
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