Bulletin of the Korean Chemical Society最新文献_第5页

Feasibility of low-power low-resolution laser-induced breakdown spectroscopy for quantification of Mg in fermented soybean pastes 低功率低分辨率激光诱导击穿光谱法量化发酵豆浆中镁含量的可行性

IF 1.7 4区化学

Bulletin of the Korean Chemical Society Pub Date : 2024-11-25 DOI: 10.1002/bkcs.12917

Hyemin Jung, Yujin Oh, Minji Kwon, Hanbeom Choi, Hyang Kim, Sandeep Kumar, Song-Hee Han, Hojin Kim, Haejin Kim, Sang-Ho Nam, Yonghoon Lee

{"title":"Feasibility of low-power low-resolution laser-induced breakdown spectroscopy for quantification of Mg in fermented soybean pastes","authors":"Hyemin Jung, Yujin Oh, Minji Kwon, Hanbeom Choi, Hyang Kim, Sandeep Kumar, Song-Hee Han, Hojin Kim, Haejin Kim, Sang-Ho Nam, Yonghoon Lee","doi":"10.1002/bkcs.12917","DOIUrl":"https://doi.org/10.1002/bkcs.12917","url":null,"abstract":"This study explores the use of a cost-effective laser-induced breakdown spectroscopy (LIBS) instrument for analyzing magnesium (Mg) in fermented soybean pastes. Composed of soybeans and salts, these pastes are rich in proteins and minerals. A low-power diode-pumped solid-state laser and a miniature low-resolution spectrometer were used to analyze nine products, with Mg concentrations previously determined via inductively-coupled plasma optical emission spectroscopy. The LIBS spectra showed Mg II and Mg I emission peaks at 279.8 and 285.2 nm, respectively, used to create univariate calibration models. Additionally, a partial-least-squares regression (PLS-R) model showed superior accuracy. Mg concentrations correlated with the types of salts used. The study demonstrates the feasibility of using real products as calibration standards for LIBS, supported by other methods. The compact, low-cost LIBS instrument offers an alternative for quantitative mineral analysis and raw material identification in fermented soybean pastes.","PeriodicalId":54252,"journal":{"name":"Bulletin of the Korean Chemical Society","volume":"45 12","pages":"1021-1030"},"PeriodicalIF":1.7,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142862223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Cover Picture: Enhanced signal to noise ratio of single entity electrochemistry signal of platinum nanoparticles using passive silver ultramicroelectrode (BKCS 11/2024) Seongkyeong Yoon, Jaedo Na, Sun Gyu Moon, Heewon Kim, Ki Jun Kim, Seong Jung Kwon 封面图片：利用无源银超微电极提高铂纳米粒子单体电化学信号的信噪比 (BKCS 11/2024) Seongkyeong Yoon, Jaedo Na, Sun Gyu Moon, Heewon Kim, Ki Jun Kim, Seong Jung Kwon

IF 1.7 4区化学

Bulletin of the Korean Chemical Society Pub Date : 2024-11-25 DOI: 10.1002/bkcs.12753

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Fog collection using hydrophobic and hydrophilic treatments on wrinkle-based multilayered surfaces 在基于褶皱的多层表面上使用疏水和亲水处理的雾收集

IF 1.7 4区化学

Bulletin of the Korean Chemical Society Pub Date : 2024-11-24 DOI: 10.1002/bkcs.12916

Yongseong Kim, Huihwa Kim, Hyun-ju Choi

{"title":"Fog collection using hydrophobic and hydrophilic treatments on wrinkle-based multilayered surfaces","authors":"Yongseong Kim, Huihwa Kim, Hyun-ju Choi","doi":"10.1002/bkcs.12916","DOIUrl":"https://doi.org/10.1002/bkcs.12916","url":null,"abstract":"This study evaluated the fog-collection efficiency of wrinkle-based multilayer surfaces using hydrophilic and hydrophobic treatments. The wrinkle structures were fabricated by leveraging the elastic modulus and Poisson's ratio of polydimethylsiloxane (PDMS) and ultraviolet (UV) resin. The optimal wrinkle periodicity for fog collection was determined by varying the spin-coating rate of the UV resin. Chemical surface treatments were examined by applying hydrophilic (hyaluronic acid [HA]) and hydrophobic (perfluoropolyether [PFPE] and TiO₂-PFPE) agents. Surfaces with perpendicular wrinkles treated with TiO₂-PFPE demonstrated the highest fog-collection efficiency due to increased surface roughness that promoted droplet nucleation and growth. These wrinkles further optimized efficiency by facilitating the rapid downward flow of water droplets through the combined effects of gravity and capillary action. The study highlights the significant impact of wrinkle structures and surface treatments on fog collection, with the TiO₂-PFPE treatment showing particular effectiveness and potential for applications in arid regions.","PeriodicalId":54252,"journal":{"name":"Bulletin of the Korean Chemical Society","volume":"45 12","pages":"987-992"},"PeriodicalIF":1.7,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142862084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Photophysical properties of 9,9-dimethyl-9,10-dihydroacridine-functionalized salen–indium complexes: Effects of structural rigidity and number of donor substituents 9,9-二甲基-9,10-二氢吖啶官能化的硒铟配合物的光物理特性：结构刚性和供体取代基数目的影响

IF 1.7 4区化学

Bulletin of the Korean Chemical Society Pub Date : 2024-11-24 DOI: 10.1002/bkcs.12918

Yoseph Kim, Ji Hye Lee, Jaehoon Kim, Yeonsu Kim, Hyeonkwon Moon, Hyonseok Hwang, Junseong Lee, Jun Hui Park, Youngjo Kim, Myung Hwan Park

{"title":"Photophysical properties of 9,9-dimethyl-9,10-dihydroacridine-functionalized salen–indium complexes: Effects of structural rigidity and number of donor substituents","authors":"Yoseph Kim, Ji Hye Lee, Jaehoon Kim, Yeonsu Kim, Hyeonkwon Moon, Hyonseok Hwang, Junseong Lee, Jun Hui Park, Youngjo Kim, Myung Hwan Park","doi":"10.1002/bkcs.12918","DOIUrl":"https://doi.org/10.1002/bkcs.12918","url":null,"abstract":"Indium–salen complexes with electron-donating 9,9-dimethyl-9,10-dihydroacridine (DMAC) groups at positions 4 (DMACIn1) and 4 and 6 (DMACIn2) were synthesized and characterized to investigate the effect of the substituents number and structural rigidity on photophysical properties. The single crystal structure of DMACIn1 revealed highly twisted arrays (83–89°) between the DMAC groups and salen moieties and a nearly square-pyramidal geometry around the indium center. Both complexes exhibited green fluorescence in toluene at 298 K and in rigid states (in toluene at 77 K and in a film), which originates from intramolecular charge transfer (ICT) transitions. The absolute photoluminescence quantum yields (PLQYs) of DMACIn1 and DMACIn2 were low in solution but high in the rigid states. The film-state PLQY of DMACIn2 (59.5%) was more than five-fold higher than that of DMACIn1 (11.1%). A similar result was observed in toluene at 77 K. These findings were rationalized in terms of the beneficial effects of structural rigidity and higher number of DMAC donors on ICT-based radiative decay. The experimental results agreed with those of computational studies.","PeriodicalId":54252,"journal":{"name":"Bulletin of the Korean Chemical Society","volume":"45 12","pages":"940-948"},"PeriodicalIF":1.7,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142862083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Broadband plasmonic response of silver nanomaze-based nanogap-enhanced absorber 基于银纳米aze的纳米间隙增强吸收器的宽带等离子响应

IF 1.7 4区化学

Bulletin of the Korean Chemical Society Pub Date : 2024-11-21 DOI: 10.1002/bkcs.12904

Kinam Jung, Yongtaek Lee

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Unraveling the role of counter ions in shaping the structures of helical peptides in aqueous phase 揭示反离子在塑造水相螺旋肽结构中的作用

IF 1.7 4区化学

Bulletin of the Korean Chemical Society Pub Date : 2024-11-20 DOI: 10.1002/bkcs.12914

Jeseong Yoon, Youngbeom Jo, Seokmin Shin

{"title":"Unraveling the role of counter ions in shaping the structures of helical peptides in aqueous phase","authors":"Jeseong Yoon, Youngbeom Jo, Seokmin Shin","doi":"10.1002/bkcs.12914","DOIUrl":"https://doi.org/10.1002/bkcs.12914","url":null,"abstract":"Helical peptides, as well as proteins composed of helical peptides, play essential roles in various biological processes, including their functions as components of cell membranes and their interactions with biological membranes. Therefore, it is crucial to predict the propensity and structural characteristics of helices formed in solution or lipid environments for specific peptide sequences. Melittin and pexiganan are antimicrobial peptides (AMPs) that possess distinct sequence characteristics but exhibit similar structural properties in both solution and lipid environments. In this study, we conducted molecular dynamics simulations to investigate how the presence of counter ions creates differences in structural characteristics between these two peptides in solution. By analyzing the structures formed for each AMP using extended helical projections, we aimed to uncover the underlying principles governing the interaction between counter ions and peptide sequences, leading to the formation of stable structures. It was found that the coordination of counter ions effectively extends the helical surface and stabilizes the extended helix by reducing the electrostatic repulsion between charged residues. Our results demonstrate how sequence specificity influences helical structure formation in solution and provide an explanation for the varying degrees of synergistic effects exhibited by different helical AMPs.","PeriodicalId":54252,"journal":{"name":"Bulletin of the Korean Chemical Society","volume":"45 12","pages":"1000-1014"},"PeriodicalIF":1.7,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142861755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Visible light induced reactions of quinones 可见光诱导醌类的反应

IF 1.7 4区化学

Bulletin of the Korean Chemical Society Pub Date : 2024-11-17 DOI: 10.1002/bkcs.12913

Jihoon Jang, Gayeon Lee, Eun Jin Cho

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Enhanced electrocatalytic activity by nanoconfinement effects at nanoporous indium tin oxide electrodes 纳米多孔氧化铟锡电极的纳米锎效应增强了电催化活性

IF 1.7 4区化学

Bulletin of the Korean Chemical Society Pub Date : 2024-11-10 DOI: 10.1002/bkcs.12912

Minjee Seo, Je Hyun Bae

{"title":"Enhanced electrocatalytic activity by nanoconfinement effects at nanoporous indium tin oxide electrodes","authors":"Minjee Seo, Je Hyun Bae","doi":"10.1002/bkcs.12912","DOIUrl":"https://doi.org/10.1002/bkcs.12912","url":null,"abstract":"Among various strategies to enhance electrocatalytic activity, nanoporous structured electrodes have been widely utilized owing to their improved performance. Along with enlarged electrode surface, modified crystalline facets, and surface defects of nanoporous electrodes, recent studies have reported their unique electrocatalytic characteristics originating from the nanoconfined space, denoted as the nanoconfinement effect. Introducing nanoporous electrodes with controllable thickness made of indium tin oxide, an electrochemically inert material, has provided an optimal platform for analyzing the contribution of nanoporous structures to the catalytic effects. Nevertheless, the scope of reactants that has been studied based on this system so far is mostly limited to ferric/ferrous redox species in sulfate anion environment. Here, using the nanoporous indium tin oxide electrodes, we demonstrate the nanoconfinement effect toward the ferric/ferrous reaction in a different chemical environment that alters its electrokinetic characteristics compared to the previous studies. Furthermore, a complex multi-electron transfer reaction of oxygen reduction is employed to explore the effects of nanoporous structure toward inner-sphere reactions. Our work suggests that the nanoconfinement effects can be applied to a wider range of electrochemical reactions taking place in nanoporous electrodes.","PeriodicalId":54252,"journal":{"name":"Bulletin of the Korean Chemical Society","volume":"45 12","pages":"993-999"},"PeriodicalIF":1.7,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142860885","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Signal shape analysis in single-entity electrochemistry: Understanding electrochemical reaction dynamics 单实体电化学中的信号形状分析：了解电化学反应动力学

IF 1.7 4区化学

Bulletin of the Korean Chemical Society Pub Date : 2024-11-10 DOI: 10.1002/bkcs.12911

Huichang Park, Jaedo Na, Yujin Han, Dain Heo, Seongkyeong Yoon, Sunwoo Geum, Seong Jung Kwon

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Comparison of oxygen evolution reaction performance for Ni and Co using isostructural trans-cinnamate complexes 使用等结构反肉桂酸盐络合物比较镍和钴的氧进化反应性能

IF 1.7 4区化学

Bulletin of the Korean Chemical Society Pub Date : 2024-11-05 DOI: 10.1002/bkcs.12910

Hyewon Shin, Sunwoo Geum, Jimin Lee, Minkyun Shin, Kang Min Ok, Seong Jung Kwon, Junghwan Do

{"title":"Comparison of oxygen evolution reaction performance for Ni and Co using isostructural trans-cinnamate complexes","authors":"Hyewon Shin, Sunwoo Geum, Jimin Lee, Minkyun Shin, Kang Min Ok, Seong Jung Kwon, Junghwan Do","doi":"10.1002/bkcs.12910","DOIUrl":"https://doi.org/10.1002/bkcs.12910","url":null,"abstract":"Efforts are underway to develop highly active catalysts to reduce the high overpotential of the oxygen evolution reaction (OER). Metal–organic frameworks or coordination polymers are promising candidates because of their tunable structures and high surface areas. In this study, Nickel and Cobalt trans-cinnamate (t-ca) were synthesized via a hydrothermal method. Their structures were analyzed and found to be isostructural. Both complexes exhibited superior electrocatalytic properties in the OER compared to those of IrO2, with overpotentials of 373 and 390 mV and Tafel slopes of 58 and 66 mV/dec. These excellent characteristics were attributed to the electron delocalization of the metal centers via interactions with π-π delocalized organic ligands. Ni t-ca, with stronger ligand interactions, displayed an enhanced OER catalytic performance, emphasizing the importance of metal–ligand interactions and suggesting that further exploration of diverse π–π delocalized organic ligands and metal centers may lead to further advancements in electrocatalytic activity.","PeriodicalId":54252,"journal":{"name":"Bulletin of the Korean Chemical Society","volume":"45 11","pages":"920-928"},"PeriodicalIF":1.7,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142737417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0