Bulletin of the Korean Chemical Society最新文献_第3页

Direct conversion of esters to aldehydes and ketones via piperazine amide under mild conditions

IF 1.7 4区化学

Bulletin of the Korean Chemical Society Pub Date : 2025-01-14 DOI: 10.1002/bkcs.12937

Jae Seok Kwak, Ashok Kumar Jaladi, Duk Keun An

引用次数: 0

Development of biocompatible mesoporous silica materials for enhanced UV protection

IF 1.7 4区化学

Bulletin of the Korean Chemical Society Pub Date : 2025-01-13 DOI: 10.1002/bkcs.12934

Suk Joong Lee, Young Jae Lee, Ji Yea Lee, Young Sok Yun, Tae Keun Kwon, Inhong Jung

{"title":"Development of biocompatible mesoporous silica materials for enhanced UV protection","authors":"Suk Joong Lee, Young Jae Lee, Ji Yea Lee, Young Sok Yun, Tae Keun Kwon, Inhong Jung","doi":"10.1002/bkcs.12934","DOIUrl":"https://doi.org/10.1002/bkcs.12934","url":null,"abstract":"A new class of mesoporous silica (MPS)-based biocompatible ultraviolet (UV) protective materials (1–4) has been prepared and characterized. These materials, which include avobenzone (AV)-encapsulated MPS, were modified with biphenyl-4-triethoxysilane and polyethylene glycol (PEG200). Their photostability was tested under a sun-simulated lamp. It was found that the structure of the material significantly impacts UV protection performance. Specifically, encapsulating AV-enhanced UV radiation absorption, while the biphenyl layer improved UV-blocking capabilities. Additionally, the PEG layer increased the materials' biocompatibility. Materials 1–4 demonstrated critical wavelengths of 389 nm and UV-A/UV-B ratios ranging from 0.61 to 0.89. Notably, the sun protection factor values were estimated between 6.04 and 17.24. In vivo testing on nude mice showed that untreated skin exhibited significant epidermal thickening due to sunburn. In contrast, skin treated with material 3 did not show any epidermal thickening, being 14 times thinner than unprotected skin. With high stability against photodegradation, materials 1–4 are promising candidates for UV protection applications, with material 3 proving to be the most effective.","PeriodicalId":54252,"journal":{"name":"Bulletin of the Korean Chemical Society","volume":"46 2","pages":"138-144"},"PeriodicalIF":1.7,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143446993","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

Enhancing electrochemical xanthine detection: A two-step incubation strategy to minimize interference from ascorbic acid

IF 1.7 4区化学

Bulletin of the Korean Chemical Society Pub Date : 2025-01-09 DOI: 10.1002/bkcs.12936

Taeyeon Yoo, Seonhwa Park, Hyoeun Lee, Subin Park, Youngsuk Kim, Haesik Yang

{"title":"Enhancing electrochemical xanthine detection: A two-step incubation strategy to minimize interference from ascorbic acid","authors":"Taeyeon Yoo, Seonhwa Park, Hyoeun Lee, Subin Park, Youngsuk Kim, Haesik Yang","doi":"10.1002/bkcs.12936","DOIUrl":"https://doi.org/10.1002/bkcs.12936","url":null,"abstract":"Enzyme-based biosensors with mediated electrochemical detection offer a straightforward and cost-effective approach for detecting xanthine. However, electro-active interfering species such as ascorbic acid (AA) complicate the achievement of sensitive and selective detection in biological fluids. Direct and mediated oxidation of AA elevates electrochemical background levels. While ascorbate oxidase (AOx) is employed to oxidize AA into an electro-inactive product, incomplete removal of AA allows it to reduce the electron mediator, resulting in still considerable background levels. Additionally, excess AOx can oxidize the signaling species, the reduced form of the electron mediator, albeit slowly, leading to decreased signal levels. To address these challenges, a two-step incubation process and the use of appropriate AOx concentration are implemented. Once AA is fully oxidized by AOx, an electron mediator is added to the solution. To enhance the electrochemical signal-to-background ratio, an optimal pairing of a xanthine-oxidizing enzyme and an electron mediator is selected from two xanthine-oxidizing enzymes [xanthine dehydrogenase (XDH) and xanthine oxidase] and three electron mediators [Os(bpy)2Cl2+, Ru(NH3)63+, and Fe(CN)63−]. The combination of XDH and Os(bpy)2Cl2+ provides high signal and low background levels. When these conditions are applied to xanthine detection in artificial serum, a detection limit of approximately 500 nM is achieved, making it applicable in various clinical and research fields.","PeriodicalId":54252,"journal":{"name":"Bulletin of the Korean Chemical Society","volume":"46 2","pages":"156-163"},"PeriodicalIF":1.7,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143446686","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

Discovery of novel benzosultam CRBN ligands

IF 1.7 4区化学

Bulletin of the Korean Chemical Society Pub Date : 2025-01-06 DOI: 10.1002/bkcs.12921

Hoyeong Park, Santosh Shivanand Raikar, Yonghyo Kim, Chong Hak Chae, Yong-Hee Cho, Pilho Kim

引用次数: 0

Interfacial stabilization of lithium metal anodes in propylene carbonate electrolytes with tris(trimethylsilyl) phosphite

IF 1.7 4区化学

Bulletin of the Korean Chemical Society Pub Date : 2025-01-02 DOI: 10.1002/bkcs.12935

Dagyo Kim, Ji Seong Heo, Youngkwon Kim, Taeeun Yim

{"title":"Interfacial stabilization of lithium metal anodes in propylene carbonate electrolytes with tris(trimethylsilyl) phosphite","authors":"Dagyo Kim, Ji Seong Heo, Youngkwon Kim, Taeeun Yim","doi":"10.1002/bkcs.12935","DOIUrl":"https://doi.org/10.1002/bkcs.12935","url":null,"abstract":"Although lithium (Li) metal is considered a next-generation material owing to its high theoretical capacity, several challenges restrict its use, such as rapid dendrite formation and continuous decomposition of the electrolyte at the interfaces. In this regard, we propose tris(trimethylsilyl) phosphite (TMSP) as an effective additive for stabilizing Li metal anodes in the presence of propylene carbonate (PC) solvent. Incorporating the TMSP additive into PC-based electrolytes provides a highly stable and robust interface at the Li anode because the TMSP additive facilitates the formation of LiSiOx and LixPOyFz-based solid electrolyte interfaces (SEI) at the Li anode. These stable TMSP-derived SEI layers inhibit the uneven dendritic Li growth at the anode interface, effectively preventing further decomposition of the PC-based electrolyte. In Li/NCM622 cells, the TMSP-P-SE exhibited stable cycling retention after 100 cycles (72.3%), whereas the P-SE revealed a drastic decrease in cycling retention after only 10 cycles. These results indicate that the SEI formed on the Li anode in the presence of TMSP effectively inhibits parasitic reactions, thereby enhancing cycling retention significantly.","PeriodicalId":54252,"journal":{"name":"Bulletin of the Korean Chemical Society","volume":"46 2","pages":"145-151"},"PeriodicalIF":1.7,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143446825","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

Effect of the field strength on the MAS NMR spectra: Comparative study between diamagnetic and paramagnetic systems

IF 1.7 4区化学

Bulletin of the Korean Chemical Society Pub Date : 2024-12-26 DOI: 10.1002/bkcs.12928

Yoonju Shin, Sunghee Min, Sangdoo Ahn, Young Joo Lee

{"title":"Effect of the field strength on the MAS NMR spectra: Comparative study between diamagnetic and paramagnetic systems","authors":"Yoonju Shin, Sunghee Min, Sangdoo Ahn, Young Joo Lee","doi":"10.1002/bkcs.12928","DOIUrl":"https://doi.org/10.1002/bkcs.12928","url":null,"abstract":"Solid-state NMR spectroscopy has gained increasing attention as a probe to investigate structures and dynamics of various solid materials, in particular, materials for rechargeable batteries. Cathodes and anodes for rechargeable batteries contain unpaired electrons (paramagnetic), which generate localized magnetic fields at molecules. Owing to this paramagnetic interaction, it is often complicated to measure and interpret the NMR spectra of the paramagnetic systems. Thus, understanding the effect of the interaction between unpaired electrons and nuclei is important. NMR spectroscopy at higher magnetic fields has been perceived as beneficial since this can provide higher sensitivity and resolution. However, the response to the magnetic field strength varies depending on the nuclei of interest and material properties because various factors affect NMR characteristics. In this work, we performed a systematic study of the effect of the field strength on the magic angle spinning (MAS) NMR characteristics by comparing diamagnetic and paramagnetic systems at two different magnetic fields. As diamagnetic materials, LiCoO2 (LCO) and Li2O are examined. As paramagnetic materials, LiFePO4(LFP) and lithium nickel manganese cobalt oxides (LiNixMnyCo1–x–yO2) with different compositions are investigated. We have demonstrated that higher signal intensity and narrower linewidths can be obtained at higher magnetic fields for diamagnetic systems, whereas higher signal intensity and better resolution are obtained at lower magnetic fields for paramagnetic systems. Our research will provide systematic and experimental evidence about the field strength dependence of paramagnetic systems and rationalized grounds for choosing proper NMR spectrometers for each material.","PeriodicalId":54252,"journal":{"name":"Bulletin of the Korean Chemical Society","volume":"46 1","pages":"77-84"},"PeriodicalIF":1.7,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143119674","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

Comparison of machine learning models for classifying edible oils using Fourier-transform infrared spectroscopy

IF 1.7 4区化学

Bulletin of the Korean Chemical Society Pub Date : 2024-12-23 DOI: 10.1002/bkcs.12932

Hyeona Lim, Seon Yeong Lee, Jin Young Kim, Yeon Ju Shin, Yerin Jang, Hyeonjin Kim, Byung Hee Kim, Sangdoo Ahn

{"title":"Comparison of machine learning models for classifying edible oils using Fourier-transform infrared spectroscopy","authors":"Hyeona Lim, Seon Yeong Lee, Jin Young Kim, Yeon Ju Shin, Yerin Jang, Hyeonjin Kim, Byung Hee Kim, Sangdoo Ahn","doi":"10.1002/bkcs.12932","DOIUrl":"https://doi.org/10.1002/bkcs.12932","url":null,"abstract":"Accurate classification and authentication of edible oils are essential for maintaining product quality, ensuring consumer safety, and preserving market integrity. Therefore, this study aims to propose Fourier-transform infrared (FT-IR) spectroscopy, combined with advanced machine learning models, as a rapid and non-destructive technique for classifying edible oils. The FT-IR spectra of seven edible oil types were analyzed across three spectral regions: the full range, the C-H stretching range, and the fingerprint region. Both absorbance and second derivative spectra were used to evaluate the influence of spectral preprocessing on classification accuracy. Six machine learning models—principal component analysis followed by linear discriminant analysis (PCA-LDA), k-nearest neighbors, decision tree, random forest, eXtreme Gradient Boosting, and support vector machines (SVM)—were employed to classify the oils, achieving training accuracies of 96.4%–100% and testing accuracies of 88.1%–100%. The second derivative spectra enhanced model performance by improving the resolution of overlapping peaks, particularly in the CH and CO stretching regions. Additionally, the SHapley Additive exPlanations analysis further revealed the most critical spectral features influencing model predictions, offering valuable insights into the decision-making processes. This study demonstrates the effectiveness of combining FT-IR spectroscopy, second derivative preprocessing, and machine learning techniques for classifying edible oils. The findings highlight the benefits of second derivative spectra in enhancing spectral resolution and the superior classification performance of PCA-LDA and SVM models. These results offer a robust framework for advancing edible oil analysis and emphasize the potential of artificial intelligence in food authentication and quality control.","PeriodicalId":54252,"journal":{"name":"Bulletin of the Korean Chemical Society","volume":"46 2","pages":"131-137"},"PeriodicalIF":1.7,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143446677","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

Nanoparticle-based drug delivery system with enhanced loading and targeting performance: A brief account

IF 1.7 4区化学

Bulletin of the Korean Chemical Society Pub Date : 2024-12-20 DOI: 10.1002/bkcs.12931

Jun Yong Oh, Gyeongseok Yang, Eunshil Choi, Ja-Hyoung Ryu

引用次数: 0

Vibrational relaxation and energy distribution in adenosine monophosphate

IF 1.7 4区化学

Bulletin of the Korean Chemical Society Pub Date : 2024-12-20 DOI: 10.1002/bkcs.12927

Jongbaik Ree, Kyoung Chul Ko, Hyung Kyu Shin

引用次数: 0

Comparing kinetic methods for ball-mill grinding: Molecular weight versus refractive index-based methods

IF 1.7 4区化学

Bulletin of the Korean Chemical Society Pub Date : 2024-12-19 DOI: 10.1002/bkcs.12930

Somin Cha, Byeongyeol Park, Tae-Hyun Kim, Gregory I. Peterson

{"title":"Comparing kinetic methods for ball-mill grinding: Molecular weight versus refractive index-based methods","authors":"Somin Cha, Byeongyeol Park, Tae-Hyun Kim, Gregory I. Peterson","doi":"10.1002/bkcs.12930","DOIUrl":"https://doi.org/10.1002/bkcs.12930","url":null,"abstract":"Polymers are commonly subjected to ball-mill grinding (BMG) to induce chain scission. Milling and polymer parameters can influence the kinetics of degradation, and various kinetic methods have been employed to study this process. The most common methods include molecular weight models (fitting the decrease in molecular weight with milling time) and refractive index (RI)-based methods (such as the Florea method, which fits the decrease in RI signal with milling time). In this report, we compare the rate constant trends obtained from three different molecular weight models and the Florea method to provide a deeper understanding of how the kinetic method employed in kinetic studies influences the observed reactivity trends. Specifically, each kinetic method was applied to BMG-induced degradation data from polystyrene (PS) and poly(lactide) (PLA) of varying initial molecular weight. Each kinetic method produced different rate constant trends (e.g., initial molecular weight vs. rate constant), which could also be influenced by changing the milling duration. Molecular weight models or the Florea method were better suited with longer or shorter milling durations, respectively. Furthermore, the rate constant trends for PS and PLA were relatively consistent if compared with the same kinetic method. We expect that this work will help guide future BMG-based degradation kinetics studies.","PeriodicalId":54252,"journal":{"name":"Bulletin of the Korean Chemical Society","volume":"46 2","pages":"96-103"},"PeriodicalIF":1.7,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143446925","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