Article
Chemistry, Physical
Alvaro Javier Patino-Agudelo, Frank H. Quina
Summary: One intriguing characteristic of zwitterionic surfactant micelles is their ability to selectively bind anions of added salts. This study investigates the thermodynamics of the interaction between strongly bound perchlorate ions and weakly bound bromide ions with micelles of N-tetradecyl-N,N-dimethyl-3-ammonio-1-propanesulfonate (SB3-14) in aqueous solution. The results indicate that both binding processes are exothermic and driven by enthalpy, but unfavorable in terms of entropy. The Gibbs free energy shows only modest changes as the extent of anion binding increases. Additionally, the binding of perchlorate ions has minimal effect on the aggregation numbers of SB3-14 micelles. These findings are explained by considering factors such as the ion-pairing mechanism between anions and the positive charge center of the zwitterion headgroup, as well as the interplay between electrostatics, solvent reorganization, and the loss of translational degrees of freedom during anion binding.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Thermodynamics
Ziga Medos, Isidora Cobanov, Marija Bester-Rogac, Bojan Sarac
Summary: This research paper examines the issues associated with power compensation isothermal titration calorimetry, highlighting the possibility of obtaining different enthalpy values with different instruments and setting parameters. It emphasizes that modern calorimeters' dynamic power compensation mode may lead to overcompensation of heat effects, resulting in experimental results heavily reliant on chosen parameters. To avoid these problems, the paper suggests checking raw signals and conducting experiments with low or disabled power compensation when observing switching effects.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Chemistry, Physical
Pablo F. Garrido, Margarida Bastos, Adrian Velazquez-Campoy, Philippe Dumas, Angel Pineiro
Summary: The experiment focused on the spontaneous adsorption of amphiphilic molecules to fluid interfaces and the heat exchange involved in the process. Findings showed that the formation, growth, and release of air bubbles in different liquids resulted in various heat phenomena, offering insights into parameters such as surface tension.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Agriculture, Multidisciplinary
Bhoopal Bhuvanachandra, Dokku Sivaramakrishna, Sk Alim, Gopi Preethiba, Samudrala Rambabu, Musti J. Swamy, Appa Rao Podile
Summary: Chitooligosaccharides (COS), derived from chitin or chitosan, have diverse applications. A chitosanase from Bacillus amyloliquefaciens (BamCsn) was characterized, with the crucial role of a tryptophan residue, W204, identified for its activity. BamCsn exhibited unique properties such as transglycosylation and the ability to cleave chitin oligosaccharides, showing potential for COS generation.
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
(2021)
Article
Biochemistry & Molecular Biology
Yan Liu, Chenggang Han, Tao Lu, Yi Liu, Hao Chen, Can Yang, Yanbei Tu, Yanfang Li
Summary: Chrysoeriol (CHE), a natural flavone, shows potent Xanthine oxidase (XO) inhibitory activity through competitive inhibition with hydrogen bonding and hydrophobic interaction. The interaction between CHE and XO was studied through fluorescence quenching and conformational changes, revealing the binding mechanism of CHE towards XO. Molecular docking study enhanced the understanding of CHE's binding affinity towards XO, while molecular dynamic simulation and ADMET prediction showed promising stability and pharmacokinetic properties of CHE.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Polymer Science
Jacek J. Walkowiak, Rohit Nikam, Matthias Ballauff
Summary: The effective charge of highly charged polyelectrolytes is significantly lowered by a condensation of counterions. This effect is more pronounced for divalent ions. Our study on dendritic polyglycerol sulfate (dPGS) demonstrates that the interactions between dPGS and divalent ions (Mg2+ and Ca2+) show no ion specificity but clear competition between monovalent and divalent ions. These findings support the latest theoretical studies and indicate the sequential replacement of monovalent ions with divalent ions.
Article
Biochemistry & Molecular Biology
Adam Juhasz, Gyongyi Gombar, Egon F. Varkonyi, Marek Wojnicki, Ditta Ungor, Edit Csapo
Summary: Fluorescent gold nanoclusters have been successfully used as fluorescent markers for imaging of cells and tissues, and their potential role in drug delivery monitoring is coming to the fore. In addition, the development of biosensors using structure-tunable fluorescent nanoclusters is also a prominent research field. The primary motivation of this article is to carry out a series of tests to partially fill the scientific gap in the thermodynamic characterization of the interaction between nanoclusters and relevant biomolecules/proteins.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Nutrition & Dietetics
Natjan-Naatan Seeba, Robert Risti, Aivar Lookene
Summary: This study aimed to investigate the differences in lipoprotein lipase (LPL) activity between vegans and omnivores. The results showed no significant differences in LPL activity between the two groups, but considerable variations were found within both groups. Vegans had lower total cholesterol and LDL-C levels compared to omnivores. These findings suggest that the lipid-related benefits of a vegan diet may primarily come from cholesterol reduction rather than affecting serum as a medium for LPL-mediated triglyceride breakdown.
Article
Food Science & Technology
Qian Zhang, Zhipeng Yu, Wenzhu Zhao
Summary: This study aimed to identify novel antioxidant peptides from copra meal protein and confirmed the scavenging activity of peptides GMEEER and EEGER on free radicals. Molecular docking and isothermal titration calorimetry were used to explore the mechanism of antioxidant peptides in scavenging free radicals, and the results showed that hydrophobic interactions and hydrogen bonding were the major driving forces. These findings revealed the antioxidant mechanism of copra meal protein and provided theoretical support for its high-value utilization.
LWT-FOOD SCIENCE AND TECHNOLOGY
(2023)
Article
Biochemistry & Molecular Biology
Po-Jung Jimmy Huang, Natasha M. Evans, Chang Lu, Albert Zehan Li, Thorsten Dieckmann, Juewen Liu
Summary: This study reveals that some adenosine binding DNA aptamers can also bind caffeine and theophylline, albeit with lower affinities. The affinity of adenosine to theophylline DNA aptamer was found to be significantly lower compared to theophylline. NMR spectroscopy analysis showed similar binding structures for both adenosine and theophylline to the DNA theophylline aptamer, suggesting possible cross-binding. However, the RNA aptamer did not exhibit binding to adenosine. These findings highlight the diverse binding mechanisms of aptamers to theophylline and the potential role of nucleic acids in regulatory functions.
Article
Biochemistry & Molecular Biology
Munira Khatun, Gopal Chandra Jana, Sk Nayim, Asima Dhal, Anirudha Patra, Maidul Hossain
Summary: This report discusses the structural and thermodynamic characteristics of the interaction between four 9-O-substituted berberines and CT-DNA. The analogues, except BRDR2, showed partly intercalative binding to DNA. Hydrophobic interaction plays a crucial role in this process. The complete multispectroscopic and thermodynamic binding studies are useful for drug design and development.
JOURNAL OF BIOMOLECULAR STRUCTURE & DYNAMICS
(2023)
Article
Chemistry, Analytical
Lorena Zara, Silvia Achilli, Benoit Chovelon, Emmanuelle Fiore, Jean-Jacques Toulm, Eric Peyrin, Corinne Ravelet
Summary: This study aimed to develop fluorescence anisotropy biosensor platforms for pesticide detection, but the isolated DNA aptamers did not bind to the target pesticides. This raises doubts about the effectiveness of aptasensors relying on these particular DNA molecules.
ANALYTICA CHIMICA ACTA
(2021)
Article
Engineering, Environmental
Min-Ji Kim, Yuliia Herchenova, Jaeshik Chung, Sang-Heon Na, Eun-Ju Kim
Summary: This study systematically investigates the aggregation behavior of polystyrene nanoplastics (PS NPs) under different electrolyte conditions and the impact of environmental factors on NP stability. The results show that solvation entropy plays a significant role in NP aggregation, and the stability of PS NPs is influenced by ionic strength and the presence of natural colloids.
Review
Chemistry, Analytical
Yichen Zhao, Kayvan Yavari, Juewen Liu
Summary: Over the past three decades, aptamer-based biosensors have been extensively studied. This article reviews recent papers that question the binding ability of popular aptamers and provides insights into the reasons for false positive results. It also highlights the importance of carefully designed controls and immobilized libraries for obtaining high-quality aptamers. The findings emphasize the need for validated aptamers in order to achieve meaningful results in biosensor design.
TRAC-TRENDS IN ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Applied
Artwin Archut, Claus Rolin, Stephan Drusch, Hanna Kastner
Summary: Sugar beet pectin (SBP) is of interest due to its molecular structure and emulsifying properties. This study investigated the impact of neutral sugar side chains and acetyl groups on the interaction between SBP and pea protein. The results showed that a protein-to-pectin ratio of 4:1 led to the highest interaction. Less content of neutral sugars resulted in enhanced turbidity, and a higher content of acetyl groups increased the interaction with pea protein.
FOOD HYDROCOLLOIDS
(2023)
Article
Chemistry, Applied
Shohei Yamashita, Yusaku Yamamoto, Hisataka Kawabata, Yasuhiro Niwa, Misaki Katayama, Yasuhiro Inada
Article
Electrochemistry
Koji Miyake, Toshiki Takemura, Atsushi Gabe, Yexin Zhu, Misaki Ota, Yasuhiro Shu, Yuichiro Hirota, Yoshiaki Uchida, Shunsuke Tanaka, Misaki Katayama, Yasuhiro Inada, Emilia Morallon, Diego Cazorla-Amoros, Norikazu Nishiyama
ELECTROCHIMICA ACTA
(2019)
Article
Chemistry, Inorganic & Nuclear
Nobuhiro Miyata, Kenji Toyoda, Reiko Hinogami, Misaki Katayama, Yasuhiro Inada, Toshiaki Ohta
JOURNAL OF SOLID STATE CHEMISTRY
(2019)
Article
Chemistry, Physical
Ning Wang, Satoshi Hinokuma, Toshiaki Ina, Hajime Toriumi, Misaki Katayama, Yasuhiro Inada, Chunyu Zhu, Hiroki Habazaki, Yoshitaka Aoki
CHEMISTRY OF MATERIALS
(2019)
Article
Chemistry, Analytical
Misaki Katayama, Hirona Yamagishi, Yusaku Yamamoto, Yasuhiro Inada
ANALYTICAL SCIENCES
(2020)
Article
Chemistry, Multidisciplinary
Yuji Kikukawa, Kensuke Seto, Daiki Watanabe, Hiromasa Kitajima, Misaki Katayama, Shohei Yamashita, Yasuhiro Inada, Yoshihito Hayashi
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2020)
Article
Chemistry, Physical
Shubham Kaushik, Kazuhiko Matsumoto, Yuki Orikasa, Misaki Katayama, Yasuhiro Inada, Yuta Sato, Kazuma Gotoh, Hideka Ando, Rika Hagiwara
Summary: This study investigates the performance of VP2 as a negative electrode alongside ionic liquids in sodium-ion batteries, revealing improved performance at intermediate temperatures and enhanced rate and cycle performance at 90 degrees C. Electrochemical tests show reduced charge transfer resistance and the formation of a uniform and stable solid electrolyte interface (SEI) layer at 90 degrees C. The conversion-based mechanism forming Na3P after charging is confirmed through X-ray diffraction and nuclear magnetic resonance spectroscopy.
JOURNAL OF POWER SOURCES
(2021)
Article
Electrochemistry
Yuki Umemura, Tomonari Takeuchi, Hikari Sakaebe, Hisao Kiuchi, Toyonari Yaji, Misaki Katayama
Summary: In this study, Phosphorus was introduced into VS4 to enhance its electrochemical cycle performance, resulting in a significant increase in cycle capability. The structural reversibility of VS4 for Li insertion/extraction reactions was improved by the addition of phosphorus.
Article
Chemistry, Physical
Misaki Katayama, Takuto Nishikawa, Hirona Yamagishi, Shogo Yasuda, Tomoya Sano, Takashi Kameyama, Yuki Orikasa, Yasuhiro Inada
Summary: The study revealed that the carbon content and surface modification of current collector influence the reaction distribution of LiFePO4 cathodes in lithium-ion batteries, while higher discharge rates and temperatures promote inhomogeneous reactions. Additionally, it was found that IR drop in the reaction channels sharpens reaction spots at higher discharge rates.
JOURNAL OF POWER SOURCES
(2021)
Article
Chemistry, Multidisciplinary
Y. Zhu, K. Miyake, Y. Shu, K. Moroto, Y. Hirota, Y. Uchida, S. Tanaka, T. Zheng, M. Katayama, Y. Inada, E. Morallon, D. Cazorla-Amoros, C. Y. Kong, N. Nishiyama
Summary: Zeolite-templated carbons with curved and single-layer graphene frameworks have uniform micropores and high surface areas. The Co/N-doped ZTC synthesized in this work shows excellent catalytic performance on the oxygen reduction reaction due to the presence of single atomic Co species. This synthetic concept of fabricating single atomic transition metals coordinated with heteroatoms in ZTCs contributes to the advancement of material design for single atomic catalyst-supported porous materials.
MATERIALS TODAY CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
S. Murase, Y. Yoshikawa, K. Fujiwara, Y. Fukada, T. Teranishi, J. Kano, T. Fujii, Y. Inada, M. Katayama, K. Yoshii, T. Tsuji, D. Matsumura, N. Ikeda
Summary: An attempt was made to control the valence of mixed valence iron triangular oxide YbFe2O4 through electrochemical doping of Li +. Systematic changes in lattice constant and Fe - Fe, Fe-Yb distances were observed with maximum doping exceeding 300 mAh/g. However, detailed observation of the iron valence state of YbFe2O4 was hindered by signal overlap from iron metal nano particles.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
Mitsuharu Tabuchi, Yoshikazu Sasaki, Hideka Shibuya, Kyousuke Doumae, Misaki Katayama, Keisuke Yamanaka, Yasuhiro Inada, Ryota Yuge, Kei Kubota
Summary: Samples calcined in different environments showed variations in initial capacities and crystal phase structures. The sample calcined in N-2 atmosphere exhibited higher initial capacities and suppressed the formation of cubic spinel. Fe3+ ions were effectively utilized as redox centers. The sample underwent partial reduction to the trivalent state during discharging.
MATERIALS RESEARCH BULLETIN
(2022)
Article
Chemistry, Analytical
Ayuko Kitajou, Hirona Yamagishi, Misaki Katayama, Kazuki Yoshii, Masahiro Shikano, Hikari Sakaebe, Shigeto Okada
Summary: Iron-based conversion-type materials are promising cathodes for large-scale Li-ion batteries due to their low cost and environmental impact. This study investigated the effect of electrolyte type on the conversion reaction of iron fluoride (FeF2), and found that changing the electrolyte solvent improved the cyclability of FeF2. The primary factor in the deterioration of cycle performance was the elution of iron into the electrolyte.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Physical
Satoshi Ogawa, Kei Nakayama, Misaki Katayama, Ryo Ishikawa, Yuichi Ikuhara, Miwa Saito, Teruki Motohashi
Summary: This study reports the fabrication and characterization of gas diffusion electrodes (GDEs) incorporating melilite-type oxide electrocatalysts. The mixed melilites showed high OER activity and durability, with potential applications in practical electrocatalysis for metal-air batteries.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Akihiro Koide, Yohei Uemura, Daiki Kido, Yuki Wakisaka, Satoru Takakusagi, Bunsho Ohtani, Yasuhiro Niwa, Shunsuke Nozawa, Kohei Ichiyanagi, Ryo Fukaya, Shin-ichi Adachi, Tetsuo Katayama, Tadashi Togashi, Shigeki Owada, Makina Yabashi, Yusaku Yamamoto, Misaki Katayama, Keisuke Hatada, Toshihiko Yokoyama, Kiyotaka Asakura
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2020)
