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Improvement of extracellular polysaccharides production from Cordyceps militaris immobilized alginate beads in repeated-batch fermentation

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LWT 2024年 193卷

作者： Hou, Shi-Jing Cheng, Kuan-Chen Lin, Shyh-Hsiang Hsiao, I-Lun Santoso, Shella Permatasari Singajaya, Stephanie Chou, Yu-Chieh Lin, Shin-Ping Master Program in Food Safety Taipei Medical University 250 Wu-Hsing Street Taipei11031 Taiwan Institute of Biotechnology National Taiwan University 1 Roosevelt Rd. Sec. 4 Taipei10617 Taiwan Graduate Institute of Food Science and Technology National Taiwan University 1 Roosevelt Rd. Sec. 4 Taipei10617 Taiwan Department of Medical Research China Medical University Hospital China Medical University 91 Hsueh-Shih Rd. Taichung40402 Taiwan Department of Optometry Asia University 500 Lioufeng Rd. Wufeng Taichung41354 Taiwan School of Nutrition and Health Sciences Taipei Medical University 250 Wu-Hsing Street Taipei11031 Taiwan School of Food Safety Taipei Medical University 250 Wu-Hsing Street Taipei11031 Taiwan Department of Chemical Engineering Widya Mandala Surabaya Catholic University Kalijudan 37 East Java Surabaya60114 Indonesia Collaborative Research Center for Sustainable and Zero Waste Industries Kalijudan 37 East Java Surabaya60114 Indonesia Ph.D. Program in Drug Discovery and Development Industry Taipei Medical University 250 Wu-Hsing Street Taipei11031 Taiwan Research Center of Biomedical Device Taipei Medical University 250 Wu-Hsing Street Taipei11031 Taiwan TMU Research Center for Digestive Medicine Taipei Medical University 250 Wu-Hsing Street Taipei11031 Taiwan

Cordyceps militaris (C. militaris) is a unique medicinal fungus of the genus Cordyceps. It has high economic value due to various biological functions from the extracellular polysaccharides (EPSs) it produces. The aim of this study was to establish a mycelium-immobilization system for EPS production in a bubble column system. First, EPS production was optimized by 90.2% (from 0.72 to 1.37 g/L) using response surface methodology under an alginate-immobilized mycelium system with 6 days of cultivation. The highest EPS production was obtained (5.3 g/L) in a flask system through elongation to 15 days of cultivation. EPS production subsequently further increased to 10.42 g/L utilizing a bubble column reactor. Furthermore, the system can be reused for at least three rounds. In the EPS characteristics analysis, the produced EPSs were mainly composed of glucose and galactose. They presented strong antibacterial activity against Staphylococcus aureus. In terms of antioxidant activity, respective the EPS concentration that caused 50% scavenging of DPPH and ABTS free radicals values (IC50) were 4.65 and 7.92 mg/mL. In summary, these findings should be helpful for establishing a suitable industrial fermentation system for C. militaris and can be studied in the food and medical industries in future work. © 2024 The Authors

关键词： Mycelium

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Persistence and dynamic structures of diverse cephalosporinase genes in nontyphoidal Salmonella in cross-sectional surveillance in Taiwan

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International Journal of Antimicrobial Agents 2023年第4期62卷 106944-106944页

作者： Lee, Yuarn-Jang Chang, Yu-Chu Lee, I-Hui Ho, Kuo-Hao Fang, Shiuh-Bin Lauderdale, Tsai-Ling Chen, Ting-Wen Chen, Ku-Chung Huang, Chih-Hung Huang, Tzu-Wen Division of Infectious Diseases Department of Internal Medicine Shuang Ho Hospital Taipei Medical University New Taipei City Taiwan Division of Infectious Diseases Department of Internal Medicine School of Medicine College of Medicine Taipei Medical University Taipei Taiwan Department of Biochemistry and Molecular Cell Biology School of Medicine College of Medicine Taipei Medical University Taipei Taiwan International Ph.D. Program for Cell Therapy and Regeneration Medicine College of Medicine Taipei Medical University Taipei Taiwan Department of Microbiology and Immunology School of Medicine College of Medicine Taipei Medical University Taipei Taiwan Graduate Institute of Medical Sciences College of Medicine Taipei Medical University Taipei Taiwan Division of Pediatric Gastroenterology and Hepatology Department of Pediatrics Shuang Ho Hospital Taipei Medical University New Taipei City Taiwan Department of Medical Research Shuang Ho Hospital Taipei Medical University New Taipei City Taiwan Department of Pediatrics School of Medicine College of Medicine Taipei Medical University Taipei Taiwan Master Program in Clinical Pharmacogenomics and Pharmacoproteomics College of Pharmacy Taipei Medical University Taipei Taiwan National Institute of Infectious Diseases and Vaccinology National Health Research Institutes Zhunan Taiwan Institute of Bioinformatics and Systems Biology National Yang Ming Chiao Tung University Hsinchu Taiwan Department of Biological Science and Technology National Yang Ming Chiao Tung University Hsinchu Taiwan Center for Intelligent Drug Systems and Smart Bio-devices (IDS2B) National Yang Ming Chiao Tung University Hsinchu Taiwan Department of Chemical Engineering and Biotechnology Institute of Chemical Engineering National Taipei University of Technology Taipei Taiwan

Objectives: Nontyphoidal Salmonella (NTS) is a major foodborne pathogen causing from acute gastroenteritis to bacteraemia, particularly in paediatric and elderly patients. Antimicrobial resistance of NTS, especially resistance to extended-spectrum cephalosporins, has emerged over the past decades. Methods: Thirteen NTS isolates resistant to ceftriaxone or cefotaxime were collected from a teaching hospital in Taipei, and another three from a tertiary hospital, in New Taipei City, Taiwan, from September 2018 to December 2019. Ten other archived isolates from 2000 to 2017 were also obtained. Complete genomes of the 26 isolates were obtained. Serovars, sequence types, resistomes, genetic relatedness, and sequence comparison of plasmids were analyzed. Results: Serogroups B, C2 and E were significantly associated with ampicillin resistance. Over 90% of these 26 isolates are susceptible to carbapenems and colistin. Genomic epidemiology of these isolates shows that bla_CMY-2-harbouring isolates in different serovars were prevalent over two decades, presumably resulting from highly mobile IncI1 plasmid harbouring bla_CMY-2. One type of the IncI1 plasmids contained a mobile element, IS26, which might be involved in the acquisition of antimicrobial resistance genes. Two emerging serovars, S. Goldcoast ST358 harbouring bla_CTX-M-55 on IncHI2 plasmids and S. Anatum ST64 harbouring bla_DHA-1 on IncA/C₂ plasmids persisted in Taiwan, possibly through the clonal spread. Integration of complete or partial plasmid sequences into host chromosomes or multiplications of the antimicrobial resistance genes also appears to be mediated by IS26, in the two emerging clones. Conclusion: The dynamic movement of cephalosporinase genes mediated by IS26 in NTS is of great concern. © 2023 The Authors

关键词： Amplification Chromosome integration Epidemiology Foodborne pathogen Insertion sequence Whole-genome sequencing

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Ultrafast Formation of Charge Transfer Trions at Molecular-Functionalized 2D MoS2Interfaces

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Angewandte Chemie 2024年第30期136卷

作者： Yuancheng Jing Kangkai Liang Nicole S. Muir Hao Zhou Zhehao Li Joseph M. Palasz Jonathan Sorbie Chenglai Wang Scott K Cushing Clifford P. Kubiak Zdeněk Sofer Shaowei Li Wei Xiong Department of Chemistry and Biochemistry University of California San Diego 9500 Gilman Drive MC 0358 La Jolla California 92093-0358 United States Material Science and Engineering Program University of California San Diego 9500 Gilman Drive MC 0418 La Jolla California 92093-0418 United States Division of Chemistry and Chemical Engineering California Institute of Technology 1200 E California Blvd MC 127–72 Pasadena California 91125 United States Department of Inorganic Chemistry University of Chemistry and Technology Prague Technická 5 166 28 Prague 6 Czech Republic

In this work, we investigate trion dynamics occurring at the heterojunction between organometallic molecules and a monolayer transition metal dichalcogenide (TMD) with transient electronic sum frequency generation (tr-ESFG) spectroscopy. By pumping at 2.4 eV with laser pulses, we have observed an ultrafast hole transfer, succeeded by the emergence of charge-transfer trions. This observation is facilitated by the cancellation of ground state bleach and stimulated emission signals due to their opposite phases, making tr-ESFG especially sensitive to the trion formation dynamics. The presence of charge-transfer trion at molecular functionalized TMD monolayers suggests the potential for engineering the local electronic structures and dynamics of specific locations on TMDs and offers a potential for transferring unique electronic attributes of TMD to the molecular layers.

关键词： charge transfer trion Time-resolved interfacial-sensitive spectroscopy sum frequency generation molecular- functionalized monolayer TMD

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Colony stimulating factor-1 receptor is a central component of the foreign body response to biomaterial implants in rodents and non-human primates (vol 16, pg 671, 2017)

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NATURE MATERIALS 2021年第7期20卷 1038-1038页

作者： Dolo, Joshua C. Veiseh, Omid Vegas, Arturo J. Tam, Hok Hei Farah, Shady Ma, Minglin Li, Jie Bader, Andrew Chiu, Alan Sadraei, Atieh Aresta-Dasilva, Stephanie Grin, Marissa Jhunjhunwala, Siddharth Webber, Matthew Siebert, Sean Tang, Katherine Chen, Michael Langan, Erin Dholakia, Nimit Thakrar, Raj Qi, Meirigeng Oberholzer, Jose Greiner, Dale L. Langer, Robert Anderson, Daniel G. David H. Koch Institute for Integrative Cancer Research Massachusetts Institute of Technology 500 Main Street Cambridge Massachusetts 02139 USA Department of Anesthesiology Boston Children’s Hospital 300 Longwood Avenue Boston Massachusetts 02115 USA Department of Chemical Engineering Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge Massachusetts 02139 USA Division of Health Science Technology Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge Massachusetts 02139 USA Institute for Medical Engineering and Science Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge Massachusetts 02139 USA Division of Transplantation Department of Surgery University of Illinois at Chicago Chicago Illinois 60607 USA Program in Molecular Medicine University of Massachusetts Medical School Worcester Massachusetts 01605 USA

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Ultrathin Crystalline Covalent-Triazine-Framework Nanosheets with Electron Donor Groups for Synergistically Enhanced Photocatalytic Water Splitting

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Angewandte Chemie 2021年第48期133卷

作者： Congxu Wang Hualei Zhang Wenjia Luo Tian Sun Prof. Yuxi Xu School of Engineering Westlake University Institute of Advanced Technology Westlake Institute for Advanced Study Hangzhou 310024 Zhejiang Province China State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Fudan University Shanghai 200433 China School of Chemistry and Chemical Engineering Southwest Petroleum University Chengdu 610500 China

Ultrathin nanosheets have great potential for photocatalytic applications, however, suffer from enlarged band gap and narrowed visible-light-responsive range due to the quantum confinement effect. Herein, we report a novel redox strategy for efficient preparation of ultrathin crystalline amide-functionalized covalent-triazine-framework nanosheets (CTF NSs) with enhanced visible light absorption. The CTF NSs exhibited photocatalytic hydrogen (512.3 μmol h −1 ) and oxygen (12.37 μmol h −1 ) evolution rates much higher than that of pristine bulk CTF. Photocatalytic overall water splitting could be achieved with efficient stoichiometric H 2 (5.13 μmol h −1 ) and O 2 (2.53 μmol h −1 ) evolution rates under visible light irradiation. Experimental and theoretical analysis revealed that introduction of amide groups as electron donor optimized the band structure and improve its visible-light absorption, hydrophilicity and carrier separation efficiency, thus resulting in the enhanced photocatalytic performance. The well-dispersed CTF NSs could be easily cast onto a support as a thin film device and demonstrate excellent photocatalytic activity (25.7 mmol h −1 m −2 for hydrogen evolution).

关键词： covalent triazine framework electron donor effect photocatalytic water splitting redox strategy ultrathin crystalline nanosheets

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Combinatorial large-area MoS2/Anatase-TiO2 interface: A pathway to emergent optical and opto-electronic functionalities

arXiv

引用

arXiv 2021年

作者： Maji, Tuhin Kumar Aswin, J.R. Mukherjee, Subhrajit Alexander, Rajath Mondal, Anirban Das, Sarthak Sharma, R.K. Chakraborty, N.K. Dasgupta, K. Sharma, Anjanashree M.R. Hawalder, Ranjit Pandey, Manjiri Naik, Akshay Majumdar, Kausik Pal, Samir Kumar Adarsh, K.V. Ray, Samit Kumar Karmakar, Debjani Department of Chemical Biological and Macromolecular Sciences S.N.Bose National Centre for Basic Sciences Sector III JD Block Kolkata700106 India Department of Physics Indian Institute of Science Education and Research Bhopal462066 India Department of Physics IIT Kharagpur Kharagpur West Bengal721302 India Advanced Carbon Materials Section Bhabha Atomic Research Centre Trombay Mumbai400085 India Department of Electrical Communication Engineering Indian Institute of Science Bangalore560012 India Raja Rammana Centre for Advance Technology Parmanu Nagar Sahkar Nagar Extension 1 CAT Rd Rajendra Nagar Indore Madhya Pradesh45201 India Material Science Division Bhabha Atomic Research Centre Trombay Mumbai400085 India Centre for Nano Science and Engineering Indian Institute of Science Bangalore Karnataka560012 India Centre for Materials for Electronics Technology Off Pashan Road Panchwati Pune411008 India Accelerator Control Division Bhabha Atomic Research Centre Trombay Mumbai400085 India Technical Physics Division Bhabha Atomic Research Centre Trombay400085 India

Interface of transition metal dichalcogenide (TMDC) and high-k dielectric transition metal oxides (TMO) had triggerred umpteen discourses due to the indubitable impact of TMO in reducing the contact resistances and restraining the Fermi-level pinning for the metal-TMDC contacts. In the present work, we focus on the unresolved tumults of large-area TMDC/TMO interfaces, grown by adopting different techniques. Here, on a pulsed laser deposited (PLD) MoS2 thin film, a layer of TiO2 is grown by using both atomic layer deposition (ALD) and PLD. These two different techniques emanate TiO2 layers with different crystalline properties, thicknesses and interfacial morphologies, subsequently influencing the electronic and optical properties of the interfaces. In contrast to the earlier reports of n-type doping for exfoliated MoS2/TiO2 interfaces, large-area MoS2/Anatase-TiO2 films had demonstrated a ptype doping of the underneath MoS2, irrespective of the adopted deposition technique. In addition, they manifest a boost in the extent of p-type doping with increasing thickness of TiO2, as emerged after analyzing the core-level shifts of the X-ray photoelectron spectra (XPS). Density functional analysis of the MoS2/Anatase-TiO2 interfaces, for pristine and in presence of a wide range of interfacial defects, could explain the interdependence of doping and the terminating atomic-surface of TiO2 on MoS2. The theoretical results resemble well with the realistic scenario of large-area growths after incorporating minimization of surface-strain via mutual rotation of the constituent layers. The optical properties of the interface, encompassing the photoluminescence (PL), transient absorption and z-scan two-photon absorption indicate the presence of defect-induced localized mid-gap levels in MoS2/TiO2 (PLD), resulting quenched exciton signals. On the contrary, the relatively defect-free interface in MoS2/TiO2 (ALD) demonstrates a clear presence of both A and B excitons of MoS2. This outc

关键词： Electronic structure

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Synthetic Reprogramming of Kinases Expands Cellular Activities of Proteins

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Angewandte Chemie 2022年第29期134卷

作者： Dr. Veronika M. Shoba Dr. Dhanushka N. P. Munkanatta Godage Dr. Santosh K. Chaudhary Dr. Arghya Deb Dr. Sachini U. Siriwardena Dr. Amit Choudhary Chemical Biology and Therapeutics Science Program Broad Institute of MIT and Harvard Cambridge MA 02142 USA Department of Medicine Harvard Medical School Boston MA 02115 USA Divisions of Renal Medicine and Engineering Brigham and Women's Hospital Boston MA 02115 USA

Phosphorylation-inducing chimeric small molecules (PHICS) can enable a kinase to act at a new cellular location or phosphorylate non-native substrates (neo-substrates)/ sites (neo-phosphorylations). [1, 2] We report a modular design and high-yielding synthesis of such PHICS that endowed multiple new activities to protein kinase C (PKC). For example, while PKC is unable to downregulate the activity of a gain-of-function variant (S180A) of Bruton's tyrosine kinase that evokes B cell malignancy phenotype, PHICS enabled PKC to induce inhibitory neo-phosphorylations on this variant. Furthermore, while PKC typically phosphorylates its membrane-associated substrates, PKC with PHICS phosphorylated multiple cytosol-based neo-substrates (e.g., BCR-ABL). Finally, a PHICS for BCR-ABL induced death of chronic myeloid leukemia cell lines. These studies show the power of synthetic chemistry to expand the chemical and functional diversity of proteins in cells using bifunctional molecules.

关键词： Bifunctional Molecules Kinase PHICS Phosphorylation Protein Kinase C

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Surface modification of alginate sponge using tannic acid and dodecanethiol for diesel oil spill separation from water

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International Journal of Biological Macromolecules 2025年 317卷 144453页

作者： Wijaya, Ronald Cheng, Kuan-Chen Santoso, Shella Permatasari Lin, Shin-Ping Putro, Jindrayani Nyoo Lie, Jenni Hsieh, Chang-Wei Hsu, Hsien-Yi Go, Alchris Woo Angkawijaya, Artik Elisa Chemical Engineering Department National Taiwan University of Science and Technology Taipei10607 Taiwan Institute of Food Science and Technology National Taiwan University Daan District Taipei City10617 Taiwan Institute of Biotechnology National Taiwan University No. 1 Sec. 4 Roosevelt Rd. Taipei Taiwan Department of Optometry Asia University 500 Lioufeng Rd. Wufeng Taichung Taiwan Department of Medical Research China Medical University Hospital China Medical University 91 Hsueh-Shih Rd. Taichung Taiwan Department of Food Science Fu Jen Catholic University No. 510 Zhongzheng Rd. Xinzhuang Dist. New Taipei City242062 Taiwan Chemical Engineering Department Faculty of Engineering Universitas Katolik Widya Mandala Surabaya Jl. Kalijudan No. 37 East Java Surabaya60114 Indonesia Chemical Engineering Master Program Faculty of Engineering Universitas Katolik Widya Mandala Surabaya Jl. Kalijudan No. 37 East Java Surabaya60114 Indonesia Collaborative Research Center for Zero Waste and Sustainability Universitas Katolik Widya Mandala Surabaya Jl. Kalijudan No. 37 East Java Surabaya60114 Indonesia School of Food Safety Taipei Medical University 250 Wu-Hsing Street Taipei11031 Taiwan Ph.D. Program in Drug Discovery and Development Industry College of Pharmacy Taipei Medical University 250 Wu-Hsing Street Taipei11031 Taiwan Research Center of Biomedical Device Taipei Medical University 250 Wu-Hsing Street Taipei11031 Taiwan Department of Food Science and Biotechnology National Chung Hsing University South Dist Taichung City402202 Taiwan Department of Food Science National Ilan University Shennong Road Yilan City260007 Taiwan Department of Medical Research China Medical University Hospital Taichung City404333 Taiwan City University of Hong Kong Kowloon Tong Hong Kong Shenzhen Research Institute of City University of Hong Kong Shenzhen518057 China School of Engineering University of San Carlos - Talamban Campus Gov. M. Cuenco Cebu City

An environmentally friendly absorbent sponge was successfully developed for diesel spill remediation via alginate polymer crosslinking followed by surface modification using tannic acid and dodecanethiol (TA/Do). The optimal sponge was obtained with a 3 h crosslinking duration, achieving a balance between absorption performance and structural durability, while longer crosslinking times led to increased density and reduced efficiency. Surface modification imparted hydrophobicity to the alginate sponge, confirmed by a water contact angle of 120.2°, and the successful incorporation of TA/Do was confirmed from FTIR and XPS analysis. The modified sponge (AA-3-TA/Do) exhibited a diesel absorption capacity of 17.54 g/g—a 36 % increase over the unmodified form—and retained ∼90 % of this capacity after 34 absorption–desorption cycles. Kinetic modeling showed that diesel was rapidly absorbed during early contact, with faster uptake than water. A cytotoxicity assay confirmed its non-toxic nature, indicating environmental compatibility. This study demonstrates that a simple, scalable modification using accessible materials can significantly enhance oil sorbent performance without requiring complex techniques or hazardous reagents. © 2025 Elsevier B.V.

关键词： Toxicity

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Sequestered Cell-Secreted Extracellular Matrix Proteins Improve Folliculogenesis and Oocyte Maturation for Fertility Preservation

SSRN

引用

SSRN 2020年

作者： Tomaszewski, Claire E. DiLillo, Katarina M. Baker, Brendon M. Arnold, Kelly B. Shikanov, Ariella Department of Biomedical Engineering University of Michigan University of Michigan 1101 Beal Ave Ann ArborMI48109 United States Department of Obstetrics and Gynecology University of Michigan 1101 Beal Ave Ann ArborMI48109 United States Cellular and Molecular Biology Program University of Michigan 1101 Beal Ave Ann ArborMI48109 United States Macromolecular Science and Engineering University of Michigan 1101 Beal Ave Ann ArborMI48109 United States

Synthetic matrices offer a high degree of control and tunability for mimicking extracellular matrix functions of native tissue, allowing the study of disease and development in vitro. In this study, we functionalized degradable poly(ethylene glycol) hydrogels with extracellular matrix (ECM)-sequestering peptides aiming to recapitulate the native ECM composition for culture and maturation of ovarian follicular organoids. We hypothesized that ECM-sequestering peptides would facilitate deposition and retention of cell-secreted ECM molecules, thereby recreating cell-matrix interactions in otherwise bioinert PEG hydrogels. Specifically, heparin-binding peptide from antithrombin III (HBP), heparan sulfate binding peptide derived from laminin (AG73), basement membrane binder peptide (BMB), and heparan sulfate binding region of placental growth factor 2 (RRR) tethered to a PEG hydrogel significantly improved follicle survival, growth and maturation compared to PEG-Cys, a mechanically similar but biologically inert control. Immunohistochemical analysis of the hydrogel surrounding cultured follicles confirmed sequestration and retention of laminin, collagen I, perlecan and fibronectin in ECM-sequestering hydrogels but not in bioinert PEG-Cys hydrogels. The media from follicles cultured in PEG-AG73, PEG-BMB, and PEG-RRR also had significantly higher concentrations of factors known to regulate follicle development compared to PEG-Cys. PEG-AG73 and PEG-BMB were the most beneficial for promoting follicle maturation, likely because AG73 and BMB mimic basement membrane interactions which are crucial for follicle development. Here we have shown that functionalizing PEG with ECM-sequestering peptides allows cell-secreted ECM to be retained within the hydrogels, restoring critical cell-matrix interactions and promoting healthy organoid development in a fully synthetic culture system. © 2020, The Authors. All rights reserved.

关键词： Polyethylene glycols

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Fast Water Transport in UTSA-280 via a Knock-Off Mechanism

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Angewandte Chemie 2023年第39期135卷

作者： Cheng-Hsun Hsu Hsin-Yu Yu Ho Jun Lee Pei-Hao Wu Shing-Jong Huang Jong Suk Lee Tsyr-Yan Yu Yi-Pei Li Dun-Yen Kang Department of Chemical Engineering National Taiwan University No. 1 Sec. 4 Roosevelt Road Taipei 10617 Taiwan Department of Chemical and Biomolecular Engineering Sogang University Baekbeom-ro 35 Mapo-gu Seoul 04107 Republic of Korea Institute of Atomic and Molecular Sciences Academia Sinica Taipei Taiwan Instrumentation Center National Taiwan University Taipei 10617 Taiwan Institute of Emergent Materials Sogang University 35 Baekbeom-ro Mapo-gu Seoul 04107 Republic of Korea International Graduate Program of Molecular Science and Technology (NTU-MST) National Taiwan University Taipei 10617 Taiwan Molecular Science and Technology Program Taiwan International Graduate Program (TIGP) Academia Sinica Taipei 11529 Taiwan Center of Atomic Initiative for New Materials National Taiwan University No. 1 Sec. 4 Roosevelt Road Taipei 10617 Taiwan

Water and other small molecules frequently coordinate within metal-organic frameworks (MOFs). These coordinated molecules may actively engage in mass transfer, moving together with the transport molecules, but this phenomenon has yet to be examined. In this study, we explore a unique water transfer mechanism in UTSA-280, where an incoming water molecule can displace a coordinated molecule for mass transfer. We refer to this process as the “knock-off” mechanism. Despite UTSA-280 possessing one-dimensional channels, the knock-off transport enables water movement along the other two axes, effectively simulating a pseudo-three-dimensional mass transfer. Even with a relatively narrow pore width, the knock-off mechanism enables a high water flux in the UTSA-280 membrane. The knock-off mechanism also renders UTSA-280 superior water/ethanol diffusion selectivity for pervaporation. To validate this unique mechanism, we conducted 1 H and 2 H solid-state NMR on UTSA-280 after the adsorption of deuterated water. We also derived potential energy diagrams from the density functional theory to gain atomic-level insight into the knock-off and the direct-hopping mechanisms. The simulation findings reveal that the energy barrier of the knock-off mechanism is marginally lower than the direct-hopping pathway, implying its potential role in enhancing water diffusion in UTSA-280.

关键词： Diffusion Knock-off Mechanism Membrane Metal-Organic Frameworks Water Transport

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