ACS Omega最新文献

{"title":"Surfactant-Driven Effects on the Antifungal Activity of Lippia origanoides Kunth Essential Oil Encapsulated in Lipid-Based Nanosystems","authors":"Gabriela Alberto Gil,&nbsp;Letícia Kakuda,&nbsp;Ludmilla Tonani,&nbsp;Marcia Regina von Zeska Kress and Wanderley Pereira Oliveira*,&nbsp;","doi":"10.1021/acsomega.4c0857810.1021/acsomega.4c08578","DOIUrl":"https://doi.org/10.1021/acsomega.4c08578https://doi.org/10.1021/acsomega.4c08578","url":null,"abstract":"<p >In recent decades, the recurrence and mortality rates of fungal infections have increased, likely due to antifungal resistance and insufficient attention from healthcare authorities. This trend highlights the urgent need for new antifungal treatments, with essential oils (EOs) emerging as promising alternatives. This study focuses on the characterization, nanoencapsulation, and evaluation of the EO of <i>Lippia origanoides</i> Kunth - pepper-rosemary - on toxicity and antifungal activity against filamentous fungi and yeasts, with a particular emphasis on the influence of surfactants. The EO was characterized by GC–MS and encapsulated in Nanostructured Lipid Carriers (NLCs) using either a nonionic surfactant or a combination with a cationic surfactant. NLCs were further characterized by the determination of the retention of the marker compound by high-performance liquid chromatography (HPLC), of morphology by transmission electronic microscopy (TEM), and their stability was assessed under thermal stress over 28 days. Minimum inhibitory concentrations (MIC) were determined against four yeast fungi - <i>Candida albicans</i> (ATCC 64548), <i>Candida auris</i> (CDC B11903), <i>Candida parapsilosis</i> (ATCC 22019), and <i>Malassezia furfur</i> (ATCC 14521) - and three filamentous fungi - <i>Aspergillus flavus</i> (ATCC 204304), <i>Fusarium keratoplasticum</i> (ATCC 36031), and <i>Trichophyton rubrum</i> (ATCC 28188). The NLC’s acute toxicity was evaluated in <i>Galleria mellonella</i> larvae. The results demonstrated the stability, safety, and potent antifungal efficacy of EO-loaded NLCs. The charge of the NLCs played a critical role in their antifungal performance for most fungal species. The differential responses observed suggest that CTAB enhances antifungal activity by imparting a positive charge to the nanoparticles, creating an additive effect with thymol. CTAB’s ability to reverse the fungal cell surface charge from negative to positive was significant. However, <i>C. auris</i>, <i>A. flavus</i>, and <i>F. keratoplasticum</i> showed no sensitivity to CTAB, indicating that surface charge was not a factor for these fungi. The EO and its NLC formulations exhibited significant in vitro antifungal activity, suggesting their potential as alternative therapies for fungal infections.</p>","PeriodicalId":22,"journal":{"name":"ACS Omega","volume":"10 8","pages":"7876–7887 7876–7887"},"PeriodicalIF":3.7,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsomega.4c08578","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143533580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unveiling Natural Power: Morin and Myricetin as Potent Inhibitors of Histidinol-Phosphate Aminotransferase in Drug-Resistant Acinetobacter baumannii","authors":"Anamika Singh,&nbsp;Mansi Tanwar,&nbsp;Tej P. Singh,&nbsp;Sujata Sharma* and Pradeep Sharma*,&nbsp;","doi":"10.1021/acsomega.4c0875310.1021/acsomega.4c08753","DOIUrl":"https://doi.org/10.1021/acsomega.4c08753https://doi.org/10.1021/acsomega.4c08753","url":null,"abstract":"<p >The emergence of multidrug-resistant <i>Acinetobacter baumannii</i> poses a significant challenge in healthcare settings, highlighting the urgent need for new therapeutic strategies. This study investigates the inhibition potential of four natural compounds, epicatechin, quercetagetin, myricetin, and morin, against histidinol-phosphate aminotransferase (HPA), a key enzyme in the histidine biosynthesis pathway of <i>A. baumannii</i>. A comprehensive approach combining <i>in silico</i> simulations and experimental techniques was used to assess the efficacy of these compounds. The docking score for myricetin was −8.616 kcal/mol, while for morin, it was −8.082 kcal/mol. The <i>in vitro</i> results examined real-time binding interactions. Experimental validation using surface plasmon resonance (SPR) revealed dissociation constants of 2.6 × 10^–6 M for myricetin and 6.7 × 10^–6 M for morin, confirming their potent binding to the HPA enzyme. Also, the antibacterial activity was evaluated against <i>A. baumannii</i> using a minimum inhibitory concentration and growth curve analysis. The results showed that morin inhibited the growth of <i>A. baumannii</i> by more than 70% at its MIC value, whereas myricetin inhibited 50% of the bacteria at its MIC value. Based on these results, morin and myricetin were identified as the most promising inhibitors, displaying strong binding affinities, stable interactions, and favorable conformational dynamics. Thus, we conclude that both morin and myricetin can serve as potential inhibitors of <i>Ab</i>HPA, forming the basis for a structure-based drug design against this deadly pathogen.</p>","PeriodicalId":22,"journal":{"name":"ACS Omega","volume":"10 8","pages":"7920–7936 7920–7936"},"PeriodicalIF":3.7,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsomega.4c08753","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143533628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Solid State NMR for Mechanistic Exploration of CO2 Adsorption on Amine-Based Silica Adsorbents","authors":"Mohammed Jasil,&nbsp; and ,&nbsp;Brijith Thomas*,&nbsp;","doi":"10.1021/acsomega.4c1122110.1021/acsomega.4c11221","DOIUrl":"https://doi.org/10.1021/acsomega.4c11221https://doi.org/10.1021/acsomega.4c11221","url":null,"abstract":"<p >Mitigating atmospheric carbon dioxide concentrations is crucial because elevated CO₂ levels drive climate change by enhancing the greenhouse effect, leading to global warming, extreme weather events, ocean acidification, loss of biodiversity, and significant socioeconomic and health challenges for ecosystems and human populations. The necessity to reduce atmospheric carbon dioxide levels has led to the creation of novel materials designed to effectively capture and convert CO₂ using carbon capture and utilization methods. A diverse array of materials such as metal–organic frameworks, covalent organic frameworks, porous carbon, zeolites, and amine functionalized silica has been reported for efficient carbon dioxide capture. Notably, amine-functionalized silica has emerged as one of the most extensively studied materials in the field of carbon dioxide capture. Solid-state NMR is a powerful spectroscopic technique for analyzing amine-based silica adsorbents, as it provides detailed, nondestructive molecular insights into structure, interactions, and adsorption mechanisms that are challenging to resolve using traditional techniques like infrared spectroscopy and BET (Brunauer-Emmett-Teller). Solid-state NMR, particularly magic angle spinning (MAS) NMR, demonstrates significant potential in providing high-resolution insights into atomic-level interactions and dynamics. This minireview will explore how solid-state NMR spectroscopy and its advancements are effective in investigating the amine immobilization and stabilization mechanism on silica, probing the local structures of CO₂ adsorption species, and assessing the influence of varying conditions on the performance of adsorbents. The information obtained through the application of various solid-state NMR experiments is emphasized, along with strategies for further enhancing this knowledge.</p>","PeriodicalId":22,"journal":{"name":"ACS Omega","volume":"10 8","pages":"7485–7492 7485–7492"},"PeriodicalIF":3.7,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsomega.4c11221","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143533704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fast Proton NMR Detection of Aqueous Ammonia with Relaxation Agent and Nitrogen Decoupling","authors":"Xuelei Duan*,&nbsp;Aitor Moreno*,&nbsp;Youlin Xia*,&nbsp;Zhijiao Ji,&nbsp;Rongjuan Cong,&nbsp;Linge Ma,&nbsp;Ming Xu,&nbsp;Xiaofang Zhang,&nbsp;Yu Zhou,&nbsp;Congyun Liu and Zhe Zhou*,&nbsp;","doi":"10.1021/acsomega.5c0033710.1021/acsomega.5c00337","DOIUrl":"https://doi.org/10.1021/acsomega.5c00337https://doi.org/10.1021/acsomega.5c00337","url":null,"abstract":"<p >The Haber–Bosch process, which synthesizes ammonia (NH₃) from nitrogen (N₂) and hydrogen (H₂), consumes approximately 2% of the global energy supply. A sustainable alternative is the direct electrochemical conversion of N₂ to NH₃. The selectivity and activity of the electrocatalysts for this process are assessed by quantifying the NH₃ present in the electrolyte. Compared with other analytical methods, ¹H NMR offers a straightforward approach for detecting NH₃ (by analyzing NH₄⁺). ¹H NMR method can also definitely confirm that the detected ammonia originates from the electroreduction of N₂ by comparing results obtained from isotopically labeled ¹⁵N₂ and regular ¹⁴N₂ gases. This capability is unique to the ¹H NMR method, as no alternative approaches offer this level of specificity. However, this method suffers from low sensitivity when measuring NH₄⁺ of low concentration of such as at μM or lower. To address this issue, we developed a novel approach that improves sensitivity by ∼3-fold through the introduction of ¹⁴N decoupling during the ¹H NMR data acquisition. Recently [<contrib-group><span>Kolen, M.</span></contrib-group> <cite><i>ACS Omega</i></cite> <span>2021</span>, <em>6</em>, 5698–5704], demonstrated a ∼3.5-fold increase in sensitivity by using a 1 mM concentration of the paramagnetic relaxation agent Gd³⁺. By combining our ¹⁴N decoupling technique with the relaxation agent Gd³⁺, we achieved a synergistic enhancement in sensitivity, resulting in an overall ∼10.9-fold sensitivity increase for the ¹H NMR detection of ¹⁴NH₄⁺. This translates to a reduction in NMR detection time by a factor of ∼119 (10.9²). This significant advancement enables the fast detection of ammonia at μM concentration or lower. ¹H NMR of ¹⁵NH₄⁺ with ¹⁵N decoupling was also demonstrated.</p>","PeriodicalId":22,"journal":{"name":"ACS Omega","volume":"10 8","pages":"8729–8735 8729–8735"},"PeriodicalIF":3.7,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsomega.5c00337","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143533727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis of Platinum Nanoparticles by Pulsed Laser Ablation with an Excimer KrF Laser in Deep Eutectic Solvents","authors":"Oana Andreea Lazar,&nbsp;Anastas Savov Nikolov,&nbsp;Liana Anicai,&nbsp;Geanina Valentina Mihai,&nbsp;Angelo Alberto Messina and Marius Enachescu*,&nbsp;","doi":"10.1021/acsomega.4c0916410.1021/acsomega.4c09164","DOIUrl":"https://doi.org/10.1021/acsomega.4c09164https://doi.org/10.1021/acsomega.4c09164","url":null,"abstract":"<p >This work reports for the first time the fabrication of metallic nanoparticles from platinum material (Pt-NPs) implying pulsed laser ablation in choline chloride–ethylene glycol deep eutectic solvent (DES) as well as in their mixtures with ethanol in a 1:3 ratio as liquid media. KrF excimer laser (λ = 248 nm) has been used as an irradiation source. The Pt target is placed in a Teflon pad on the bottom of a beaker and immersed in the corresponding liquid. The created Pt-NPs by pulsed laser ablation are dispersed in the surrounding medium, forming a colloid with it, and are characterized by the detailed methods described. A synergistic effect is achieved by combining the nontoxicity of the liquid and the biocompatibility of the Pt-NPs for the fabrication of very small, nonaggregated NPs, applicable, also, in the medical field. The peculiarities of the liquid do not allow the production parameters to be varied in wide ranges. The investigation of the Pt-NPs’ optical characteristics by UV/vis spectroscopy showed the existence of three bands. The origins of two of the bands are presumably due to interband transition and plasmonic absorption, respectively. The origin of the third band needs further in-depth investigation. The morphological properties were studied through high-resolution scanning transmission electron microscopy (HR-STEM). The minimum value of the mean size of 2.2 nm is achieved at 7 Hz RR and 40 min ablation time when the pure mixture of choline chloride–ethylene glycol, denoted as ILEG, is used. In support, the obtained Pt-NPs were analyzed by direct analysis in real time mass spectrometry (DART-MS) to demonstrate their existence in the colloidal solution. The face-centered cubic (FCC) phase for the Pt-NPs with the predominant orientation of the (220) crystalline plane was determined by X-ray diffraction (XRD). FTIR and Raman spectroscopy measurements did not show the existence of additional bonds between pure ILEG and Pt-NPs. One application of the synthesized NPs was illustrated by the increased sensitivity of detecting methylene blue through the surface-enhanced Raman spectroscopy (SERS) method.</p>","PeriodicalId":22,"journal":{"name":"ACS Omega","volume":"10 8","pages":"8066–8081 8066–8081"},"PeriodicalIF":3.7,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsomega.4c09164","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143533750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Micellar HPLC and UV Methods with Time Programming for Synchronically Quantifying Gatifloxacin and Its Preservative in Eye Drops: Appraisal of Ecological Impact","authors":"Maha A. Alwaili,&nbsp;Fahad M. Alminderej,&nbsp;Bandar R. Alsehli,&nbsp;Hassan A. Rudayni,&nbsp;Ahmed A. Allam,&nbsp;Sayed M. Saleh,&nbsp;Mahmoud A. Mohamed* and Noha S. Katamesh,&nbsp;","doi":"10.1021/acsomega.4c1050810.1021/acsomega.4c10508","DOIUrl":"https://doi.org/10.1021/acsomega.4c10508https://doi.org/10.1021/acsomega.4c10508","url":null,"abstract":"<p >Modern society is increasingly reliant on sustainable solutions. We suggest a creative study that meets the standards of sustainability in analytical chemistry. The objective is to promote eco-friendly methods for concurrently detecting Gatifloxacin (GAT) and benzalkonium chloride (BEN) in ocular solutions. Using a sustained mobile phase flow rate of 0.8 mL/min^–1 and acidic water: 10% 1-butanol in water (40:60, v/v), GAT was retained for 2.242 min at 287 nm, followed by BEN homologues at 215 nm for the next 2.982 and 4.201 min. This process was simple, quick, and precise. The method demonstrated peak symmetry, low processing times, good resolution, and correlation values 0.999. For GAT, the linearity ranged from 0.001 to 0.023 mgmL^–1, while for BEN, it was from 0.003 to 0.060 mgmL^–1 in the HPLC system, while the UV method in the range of 0.005–0.03 mgmL^–1 for all drugs. A unique feature of this study is the integration of multiple sustainability assessment tools, such as AGREE, AGREEprep, ComplexGAPI, ESA, BAGI, and NEMI pictograms, providing an exhaustive appraisal of the methods’ environmental impact and enhancing the robustness of the findings. In addition, eco-friendly and cost-effective alternatives were explored using water as the solvent in complementary spectrophotometric procedures such as mean centering of ratio spectra (MCR). Each technique showed respectable accuracy and precision (RSD ≤ 2%) and high linearity r² &gt; 0.9990. The proposed methodologies provide inexpensive, eco-friendly alternatives to conventional approaches, promoting a less harmful future for quality control and moving analytical chemistry closer to more sustainable methods.</p>","PeriodicalId":22,"journal":{"name":"ACS Omega","volume":"10 8","pages":"8472–8483 8472–8483"},"PeriodicalIF":3.7,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsomega.4c10508","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143533810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Methodological Approach Based on Structural Parameters, Vibrational Frequencies, and MMFF94 Bond Charge Increments for Platinum-Based Compounds","authors":"Gloria Castañeda-Valencia,&nbsp;Lucas F. Gama,&nbsp;Murugesan Panneerselvam,&nbsp;Viviane S. Vaiss,&nbsp;Isabella A. Guedes,&nbsp;Laurent E. Dardenne and Luciano T. Costa*,&nbsp;","doi":"10.1021/acsomega.4c1014110.1021/acsomega.4c10141","DOIUrl":"https://doi.org/10.1021/acsomega.4c10141https://doi.org/10.1021/acsomega.4c10141","url":null,"abstract":"<p >In this work, we performed a comprehensive benchmark study for the ground state of five small- and medium-sized platinum derivatives, PtH, PtCl, [PtCl₄]^2–, [Pt(NH₃)₄]²⁺, and <i>cis</i>-[Pt(NH₃)₂Cl₂], in the gas phase and two cisplatin polymorphs in the solid phase. The benchmark encompassed 16 density functionals, including nonhybrids, hybrids, and double hybrids. Furthermore, Hartree–Fock (HF) and Post-HF by Møller–Plesset MP2 methods were also tested. Additionally, 11 basis sets were explored, comparing relativistic all-electron and RECP approaches. Our results indicate that the methodologies best suited for predicting structural parameters do not excel in predicting vibrational frequencies and vice versa. In the context of this theoretical framework, we also examine the derivation of partial atomic charges and bond charge increments (bci) as fundamental parameters within the MMFF94 classical force field. Our results show that the partial atomic charges of CHELPG present a slight charge fluctuation in Pt for all investigated levels of theory, and this behavior reproduces well the soft acid definition for Pt²⁺, giving the best description of the chemical environment of platinum in the cisplatin complex. The average calculated bci values effectively capture the atomic charge variations in the chemical environment of Pt in the investigated species. The developed bci optimization tool, based on MMFF94, was implemented using a Python code made available at https://github.com/molmodcs/bci_solver. This methodology will be further implemented in the DockThor receptor–ligand docking program, allowing future molecular docking validations involving ligand compounds containing Pt atoms.</p>","PeriodicalId":22,"journal":{"name":"ACS Omega","volume":"10 8","pages":"8314–8335 8314–8335"},"PeriodicalIF":3.7,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsomega.4c10141","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143533626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preparation and Performance Evaluation of Temperature- and Salt-Resistant Hydrophobically Associated Polymer Fracturing Fluids","authors":"Xianzheng Li*,&nbsp;Chunfu Pan,&nbsp;Hao Chen,&nbsp;Zheng Zhang and Kun Ning,&nbsp;","doi":"10.1021/acsomega.4c1002310.1021/acsomega.4c10023","DOIUrl":"https://doi.org/10.1021/acsomega.4c10023https://doi.org/10.1021/acsomega.4c10023","url":null,"abstract":"<p >The development of deep oil and gas resources faces the challenge of high-temperature environments, where the performance of traditional fracturing fluids is limited. Therefore, there is an urgent need to develop fracturing fluid systems capable of withstanding high-temperature (up to 200 °C) and high-salinity (up to 45 g/L NaCl and multivalent ions) environments. This study explores the preparation and performance evaluation of a novel high-temperature (up to 200 °C) and salt-resistant (up to 45 g/L NaCl and multivalent ions) hydrophobically associated polymer fracturing fluid, focusing on its thickening mechanism and stability under extreme reservoir conditions. Key equipment used includes a rheometer for viscosity measurements and an environmental scanning electron microscope for microstructure observation. The base fluid maintained an apparent viscosity of 32.4 mPa·s at 200 °C, demonstrating excellent thermal stability. Long-term evaluations showed a viscosity retention rate of 94.9% after 90 days in high-salinity conditions, indicating outstanding durability. Sand-carrying tests revealed ceramic grain settling rates below 0.48 cm/min, confirming strong suspension capability. The fracturing fluid system exhibited low formation damage rates of 16.85% and minimal proppant pack damage, with a conductivity reduction of only 20.08%, both well below industry standards. These findings provide technical support for efficient fracturing operations in deep and ultradeep wells, particularly in environments with temperatures up to 200 °C and salinities exceeding 45 g/L NaCl, contributing to the development of fracturing fluids for such challenging conditions.</p>","PeriodicalId":22,"journal":{"name":"ACS Omega","volume":"10 8","pages":"8281–8291 8281–8291"},"PeriodicalIF":3.7,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsomega.4c10023","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143533749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis, Hydrolytic Degradation Behavior, and Surface Properties of Poly(alkyl glycolide)-Polyglycolide Copolymers","authors":"Mehtap Cantürk Bamyacı,&nbsp;Duygu Çetin,&nbsp;Candan Cengiz,&nbsp;Sema Nur Belen,&nbsp;Olcay Mert,&nbsp;Ugur Cengiz and Serap Mert*,&nbsp;","doi":"10.1021/acsomega.4c1076810.1021/acsomega.4c10768","DOIUrl":"https://doi.org/10.1021/acsomega.4c10768https://doi.org/10.1021/acsomega.4c10768","url":null,"abstract":"<p >Given the environmental impact of polymers on our daily lives, the development of biodegradable polymers is becoming increasingly critical. Poly(diisobutyl glycolide)–polyglycolide (PDIBG–PGA) and poly(diisopropyl glycolide)-polyglycolide (PDIPG–PGA) copolymers, which are structurally similar to polylactic-<i>co</i>-glycolic acid (PLGA) polyesters frequently used in the field of biomaterials, were synthesized via ring-opening polymerization (ROP) of glycolide with <span>l</span>-diisobutyl glycolide (<span>l</span>-DIBG) or <span>l</span>-diisopropyl glycolide (<span>l</span>-DIPG), respectively, in various molecular weights (<i>M</i>_w^GPC: 15.5–40.0 kDa) and in high yields (up to 85.0%). The wettability characteristics of biodegradable polymers are important not only in air but also for their behavior in underwater environments. PDIBG–PGA silica composites, due to their amphiphilic nature, exhibited water contact angles between 72° and 85° in air, unaffected by the increasing addition of hydrophilic silica nanoparticles. However, underwater–oil contact angles increased from 75° to 165° as a result of the higher silica nanoparticle content and enhanced surface roughness. When the silica content reached 30%, the surface demonstrated self-cleaning and oil-repellent properties underwater, attributed to the Cassie state, which trapped air within the surface’s hierarchical roughness. Furthermore, the surface free energy (SFE) values of PDIBG-PGA and PDIPG-PGA copolymer films were evaluated using the Owens-Wendt method, which revealed an increasing underwater hexadecane contact angle as the polar component interactions increased. Differential scanning calorimetry analysis revealed that all synthesized copolymers were amorphous, and the glass transition temperatures (<i>T</i>_g) increased with the increase in the molecular weight of the copolymers (for instance, <i>M</i>_n^GPC: 9560 g/mol → <i>T</i>_g: 25.1 °C vs <i>M</i>_n^GPC: 20,850 g/mol → <i>T</i>_g: 32.3 °C for PDIBG–PGA; <i>M</i>_n^GPC: 10,670 g/mol → <i>T</i>_g: 37.7 °C vs <i>M</i>_n^GPC: 23,360 g/mol → <i>T</i>_g: 42.3 °C for PDIPG–PGA). The molecular weight decreases of 88.3% and 76.5% and mass losses of 36.7% and 12.3% were observed for PDIBG–PGA and PDIPG–PGA copolymers after 8 weeks of hydrolytic degradation, respectively. The faster degradation of PDIBG–PGA (<i>T</i>_g: 25.1 °C) than PDIPG–PGA (<i>T</i>_g: 37.7 °C) may be attributed to the <i>T</i>_g below the hydrolytic degradation temperature (37 °C) because of an increase in the mobility of PDIBG–PGA polymer chains, allowing water molecules to transfer more easily through the matrix.</p>","PeriodicalId":22,"journal":{"name":"ACS Omega","volume":"10 8","pages":"8499–8511 8499–8511"},"PeriodicalIF":3.7,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsomega.4c10768","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143533807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Production of Lactobionic Acid by Pressure-Treated Pseudomonas fluorescens SK17.001 and the Mechanism of Pressure-Dependent Changes","authors":"Ping Wu,&nbsp;Huanxin Zhang*,&nbsp;Xiaoling Zhu,&nbsp;Jing Luo,&nbsp;Ping Liu,&nbsp;Hongxia Wu and Xinpei Qi,&nbsp;","doi":"10.1021/acsomega.4c0934510.1021/acsomega.4c09345","DOIUrl":"https://doi.org/10.1021/acsomega.4c09345https://doi.org/10.1021/acsomega.4c09345","url":null,"abstract":"<p >In this work, lactobionic acid production by <i>Pseudomonas fluorescens</i> SK17.001 and the variation of the cell envelope were studied after high hydrostatic pressure treatment. The production of lactobionic acid by the resting cells of <i>P. fluorescens</i> SK17.001 reached its maximum value (7.5 g/L) at 200 MPa and was approximately 3.5 times that at 0.1 MPa (atmospheric pressure), although the cell viability and integrity were decreased by high-pressure treatment. A pressure of 300 MPa appeared to be the turning point, in which remarkable changes occurred in the bacteria. Cell injuries were observed at 200 MPa, where the activity of membrane-bound Na⁺/K⁺-ATPase was enhanced. Pressure-induced changes were observed in the Fourier-transform infrared spectra of the cell envelope. The β-sheet content reduced from 34% to 25% with the increase of pressure from 200 to 300 MPa. These results revealed that a high-pressure treatment induced physical alteration to proteins in the cell membrane, which might be associated with changes in lactobionic acid production.</p>","PeriodicalId":22,"journal":{"name":"ACS Omega","volume":"10 8","pages":"8103–8112 8103–8112"},"PeriodicalIF":3.7,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsomega.4c09345","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143533705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}