Molecules最新文献_第2页

Large Enhancement of the Luminescence Properties of an Eu(III) Dye upon Association with the DNA-CTMA Matrix.

IF 4.2 2区化学

Molecules Pub Date : 2025-03-20 DOI: 10.3390/molecules30061395

Daniele Marinotto, Cosmina Andreea Marin, Ileana Rau, Alessia Colombo, Francesco Fagnani, Dominique Roberto, Claudia Dragonetti

{"title":"Large Enhancement of the Luminescence Properties of an Eu(III) Dye upon Association with the DNA-CTMA Matrix.","authors":"Daniele Marinotto, Cosmina Andreea Marin, Ileana Rau, Alessia Colombo, Francesco Fagnani, Dominique Roberto, Claudia Dragonetti","doi":"10.3390/molecules30061395","DOIUrl":"10.3390/molecules30061395","url":null,"abstract":"In this study, the photophysical properties of thin films of an Eu3+ dye, namely europium tetrakis(dibenzoylmethide) triethylammonium (EuD4TEA), within deoxyribonucleic acid (DNA) biopolymer functionalized with hexadecyltrimethylammonium chloride (CTMA) were extensively investigated and compared with those of thin films of the same dye embedded in more conventional polymers, like poly(methyl methacrylate) and polycarbonate. The new materials obtained have good optical properties, as shown by their absorption and emission spectra. Remarkably, a large enhancement in photoluminescence was observed upon the interaction of EuD4TEA with DNA-CTMA (2- and 17-fold increase in luminescence quantum yield with respect to PMMA and PC). Photophysical analyses suggest that the emission enhancement was mainly due to the increase in the sensitization efficiency (ηsens) from the ligands to the Eu3+ ion along with the suppression of the vibrational deactivation upon immobilization onto the DNA-CTMA matrix, as the concentration of the complex increased from 20 to 50%. These phenomena are primarily driven by the transformation of the Eu3+ micro-environments, which are created by the interactions between complex ligands and the DNA-CTMA matrix.","PeriodicalId":19041,"journal":{"name":"Molecules","volume":"30 6","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11944783/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143720756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental and Mechanistic Study on Flotation Separation of Chalcopyrite and Molybdenite Using the Novel Depressant 2-Mercapto-6-Methylpyrimidin-4-ol.

IF 4.2 2区化学

Molecules Pub Date : 2025-03-20 DOI: 10.3390/molecules30061396

Xiangwen Lv, Anruo Luo, Xiong Tong, Jianhua Chen, Sheng Jian

{"title":"Experimental and Mechanistic Study on Flotation Separation of Chalcopyrite and Molybdenite Using the Novel Depressant 2-Mercapto-6-Methylpyrimidin-4-ol.","authors":"Xiangwen Lv, Anruo Luo, Xiong Tong, Jianhua Chen, Sheng Jian","doi":"10.3390/molecules30061396","DOIUrl":"10.3390/molecules30061396","url":null,"abstract":"Chalcopyrite and molybdenite are vital strategic metal resources. Due to their close association in ores, flotation methods are commonly used for separation. The flotation separation method primarily employs the \"copper depression and molybdenum flotation\" process, enhancing the wettability difference between chalcopyrite and molybdenite through a chalcopyrite depressant. Traditional depressants often face challenges, including low selectivity, high dosage requirements, poor stability, and significant environmental pollution, highlighting the need for new, highly selective green reagents. This study introduces the novel chalcopyrite depressant 2-mercapto-6-methylpyrimidin-4-ol (MMO) for flotation separation. The influence of MMO on chalcopyrite and molybdenite flotation recovery was examined through microflotation experiments. Additionally, the effects of MMO and ethyl xanthate on surface wettability were assessed via contact angle measurements. The adsorption microstructure and interaction mechanism of MMO on chalcopyrite were elucidated using FT-IR, TOF-SIMS, and XPS analyses and DFT simulations. Results indicate that MMO enhances chalcopyrite hydrophilicity and exhibits a strong depressing effect on its flotation, while minimally impacting molybdenite recovery. Thus, it serves as an effective depressant. During adsorption, N and S atoms in MMO donate electrons to Fe and Cu ions, leading to triple bond adsorption and a stable chelate structure. These findings are crucial for achieving a greener and more efficient flotation separation of copper and molybdenum.","PeriodicalId":19041,"journal":{"name":"Molecules","volume":"30 6","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11945555/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143720741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recovery of Natural Hypoglycemic Compounds from Industrial Distillation Wastewater of Lamiaceae.

IF 4.2 2区化学

Molecules Pub Date : 2025-03-20 DOI: 10.3390/molecules30061391

Claudia Sciacca, Nunzio Cardullo, Martina Savitteri, Maria Gaetana Giovanna Pittalà, Luana Pulvirenti, Edoardo Marco Napoli, Vera Muccilli

{"title":"Recovery of Natural Hypoglycemic Compounds from Industrial Distillation Wastewater of Lamiaceae.","authors":"Claudia Sciacca, Nunzio Cardullo, Martina Savitteri, Maria Gaetana Giovanna Pittalà, Luana Pulvirenti, Edoardo Marco Napoli, Vera Muccilli","doi":"10.3390/molecules30061391","DOIUrl":"10.3390/molecules30061391","url":null,"abstract":"The food industry generates the largest number of valuable by-products. The recovery of compounds such as fatty acids and polyphenols with notorious biological properties from biowaste is a new challenge in the circular economy scenario, as they represent value-added starting materials for the preparation of functional foods, food supplements, cosmetics and over-the-counter drugs. Less commonly explored are industrial wastewaters, which return to the nearby water streams without adequate treatment. Distillation wastewater (DWW) from the essential oils or agro-food industries may represent a valuable source of bioactive compounds to be valorized. In this work, DWW from rosemary was treated with different resins through dynamic and static adsorption/desorption approaches, for the recovery of phenolic compounds including rosmarinic acid. The most effective methodology, selected according to total phenolic and rosmarinic acid contents, as well as antioxidant activity evaluation, was applied to sage, thyme and oregano DWWs. The procedure provides several advantages compared with conventional separation processes, as it involves the lower consumption of reagents/solvents, low operational costs, ease of handling, and simplicity of scale-up. The results of this work highlight a fast and sustainable procedure for the recovery of rosmarinic acid and other phenolics (caffeic acid derivatives and flavonoid glycosides) from DWWS, thus affording a fraction with antioxidant and hypoglycemic activities.","PeriodicalId":19041,"journal":{"name":"Molecules","volume":"30 6","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11944828/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143720637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fatty Acid Enrichment of Corn Extrudates with Hemp Seeds.

IF 4.2 2区化学

Molecules Pub Date : 2025-03-20 DOI: 10.3390/molecules30061390

Marta Igual, David Gimeno, Purificación García-Segovia, Javier Martínez-Monzó, Juliana Navarro-Rocha

{"title":"Fatty Acid Enrichment of Corn Extrudates with Hemp Seeds.","authors":"Marta Igual, David Gimeno, Purificación García-Segovia, Javier Martínez-Monzó, Juliana Navarro-Rocha","doi":"10.3390/molecules30061390","DOIUrl":"10.3390/molecules30061390","url":null,"abstract":"Hemp seeds (HSs) are a rich source of essential fatty acids, proteins, and antioxidant compounds, making them an attractive ingredient for the food industry. This work studies the viability of enriching corn extrudates with hemp seeds, specifically to improve their fatty acid profile and phenolic content, thereby enhancing the nutritional value of the snack. Extrudate formulations with different concentrations of HSs (up to 12.5%) were evaluated, and the physicochemical, textural, and antioxidant properties of the resulting products were analyzed. The results showed that increasing the HS concentration improved the lipid profile of the products, raising the content of unsaturated fatty acids to 75.6% in the snack fortified with 12.5% of HSs and lowering the proportion of saturated fatty acids. This may reduce the risk of cardiovascular diseases compared with corn extrudates. The total phenolic content of the snacks and their antioxidant capacity also increased linearly with the increase of HSs in the formulation. A reduction in specific mechanical energy during extrusion was also observed, attributed to the higher fat content, which facilitates the lubrication of the process. At the physicochemical level, the HS-enriched snacks showed improvements in texture. These snacks were softer, reducing the hardness of the corn snack while maintaining crunchiness. They were even more stable due to a lower water content. The fortification of snacks with hemp seeds provides consumers with a healthier option, while maintaining the appealing crunchy texture and visual appearance regardless of some changes in their color attributes.","PeriodicalId":19041,"journal":{"name":"Molecules","volume":"30 6","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11945906/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143720689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Unveiling the ESIPT Luminescence Mechanism of 4'-N,N-Diethylamino-3-Hydroxyflavone in Ionic Liquid: A Computational Study.

IF 4.2 2区化学

Molecules Pub Date : 2025-03-20 DOI: 10.3390/molecules30061381

Jin Yang, Qi Li, Meilin Guo, Lu Yan, Lixia Zhu, Jing Zhao, Guangxiong Hu, Hang Yin, Ying Shi

{"title":"Unveiling the ESIPT Luminescence Mechanism of 4'-N,N-Diethylamino-3-Hydroxyflavone in Ionic Liquid: A Computational Study.","authors":"Jin Yang, Qi Li, Meilin Guo, Lu Yan, Lixia Zhu, Jing Zhao, Guangxiong Hu, Hang Yin, Ying Shi","doi":"10.3390/molecules30061381","DOIUrl":"10.3390/molecules30061381","url":null,"abstract":"Excited state intramolecular proton transfer (ESIPT) within molecules in solvents plays important roles in photo-chemistry and photo-biology. Herein, the influence of 1-ethyl-3-methyl-imidazolium bis (trifluoromethylsulfonyl) imide ([EMIm][NTf2]) and 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIm][PF6]) on the ESIPT of 4'-N,N-diethylamino-3-hydroxyflavone (DEAHF) was explored. The density functional theory and time-dependent density functional theory methodologies were used. The calculated fluorescence spectrum reveals that the fluorescence peaks of DEAHF in [EMIm][NTf2] and [BMIm][PF6] originate from the emission of N* and T* forms. The structure's optimization, infrared spectra, non-covalent interactions and the scanning of potential energy curves collectively demonstrate that the ESIPT of DEAHF likely happen more in [EMIm][NTf2] than in [BMIm][PF6]. The solvation effects in [BMIm][PF6] exhibit greater prominence compared to those in [EMIm][NTf2], as evidenced by the free energy curve. The alterations in dipole moment indicate a substantial solvation relaxation during the ESIPT processes. Our aforementioned research offers backing for the advancement of novel fluorescent probes.","PeriodicalId":19041,"journal":{"name":"Molecules","volume":"30 6","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11945155/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143720619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance Optimization of SiO_2f/SiO₂ Composites Derived from Polysiloxane Ceramic Precursors.

IF 4.2 2区化学

Molecules Pub Date : 2025-03-20 DOI: 10.3390/molecules30061385

Xia Zhang, Bo Xiao, Yongzhao Hou, Guangwu Wen

{"title":"Performance Optimization of SiO2f/SiO2 Composites Derived from Polysiloxane Ceramic Precursors.","authors":"Xia Zhang, Bo Xiao, Yongzhao Hou, Guangwu Wen","doi":"10.3390/molecules30061385","DOIUrl":"10.3390/molecules30061385","url":null,"abstract":"In this paper, polymethylhydrosiloxane (PMHS) and ethanol were used as raw materials to synthesize the ceramic precursor of side ethoxy polysiloxane (PESO) using dehydration and a dealcoholization reaction, which had a ceramic yield of 87.15% and a very low residual carbon content. With the quartz fiber as a reinforcer, the silica matrix composites (SiO2f/SiO2) with a double-layer interface (PyC-SiO2/BNNSs) coating were manufactured using precursor impregnation pyrolysis (PIP). The as-prepared SiO2f/SiO2 possessed an excellent mechanical property, which exhibited obvious fiber pull-out and debonding phenomena from a fracture morphology. The flexural strength and fracture toughness of SiO2f/SiO2 reached 63.3 MPa and 2.52 MPa·m1/2, respectively. Moreover, the SiO2f/SiO2 had suitable dielectric properties, with a dielectric constant of about 2.5 and a dielectric loss of less than 0.01. This work provides an important concept for the enhancement of the dielectric properties and mechanical properties of quartz fiber-reinforced ceramic matrix composites, as well as in the preparation of wave-transmissivity composites.","PeriodicalId":19041,"journal":{"name":"Molecules","volume":"30 6","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11945185/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143720830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Anti-Glycation Activities of Angelica keiskei Leaves.

IF 4.2 2区化学

Molecules Pub Date : 2025-03-20 DOI: 10.3390/molecules30061394

Yuno Takemoto, Takashi Kikuchi, Wenjun Qi, Mi Zhang, Kouharu Otsuki, Wei Li

引用次数: 0

Hydrogenated Planar Aluminum Clusters: A Density Functional Theory Study.

IF 4.2 2区化学

Molecules Pub Date : 2025-03-20 DOI: 10.3390/molecules30061389

Changhong Yao, Meijiao Wang, Lianzhen Cao

引用次数: 0

Ultrasensitive Chemical Analysis on Gold Nano Popcorn Substrate Using Digital Surface-Enhanced Raman Scattering.

IF 4.2 2区化学

Molecules Pub Date : 2025-03-19 DOI: 10.3390/molecules30061371

Soyeon Lee, Jaebum Choo

{"title":"Ultrasensitive Chemical Analysis on Gold Nano Popcorn Substrate Using Digital Surface-Enhanced Raman Scattering.","authors":"Soyeon Lee, Jaebum Choo","doi":"10.3390/molecules30061371","DOIUrl":"10.3390/molecules30061371","url":null,"abstract":"This study presents a digital surface-enhanced Raman scattering (SERS) method to enhance the sensitivity of SERS detection for low-concentration analytes. Conventional SERS analysis using average Raman intensity faces limitations in distinguishing low concentrations due to the substrate's sparse distribution of target molecules. To overcome this challenge, we used a binary code-based data analysis approach. Gold nano popcorn substrates were utilized for high-sensitivity detection, with malachite green isothiocyanate (MGITC) as the target molecule. Raman mapping data were analyzed using both the conventional average Raman intensity method and the proposed digital SERS approach. In the digital SERS method, a threshold value was established based on the mean and standard deviation of Raman signals in the absence of target molecules. Pixels with Raman intensities exceeding this threshold were assigned a value of \"1\", while those below were assigned \"0\". Quantification was then performed based on these digital counts corresponding to MGITC concentrations. Our results demonstrate that the digital SERS method significantly improved the ability to distinguish and quantify analytes in low-concentration ranges that were indiscernible using the conventional approach. This analytical technique shows promise for ultrasensitive chemical analysis and expands the capabilities of SERS-based detection methods, potentially revolutionizing the field of trace analyte detection.","PeriodicalId":19041,"journal":{"name":"Molecules","volume":"30 6","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11945971/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143720614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cross-Analytical Strategies to Tackle "Medicines in Disguise" Presented as Food Supplements, a New Threat for Human Health.

IF 4.2 2区化学

Molecules Pub Date : 2025-03-19 DOI: 10.3390/molecules30061372

Judith Nzoughet Kouassi, Chouaha Bouzidi, Béatrice Nicolai, Farah Ben Jamaa, Annabelle Dugay, Jérôme Langrand, Dominique Vodovar, Pascal Houzé, Laurence Labat, Bruno Mégarbane, Cinzia Bocca, Pascal Reynier, Nicolas Guiblin, Sylvie Michel, Xavier Cachet

{"title":"Cross-Analytical Strategies to Tackle \"Medicines in Disguise\" Presented as Food Supplements, a New Threat for Human Health.","authors":"Judith Nzoughet Kouassi, Chouaha Bouzidi, Béatrice Nicolai, Farah Ben Jamaa, Annabelle Dugay, Jérôme Langrand, Dominique Vodovar, Pascal Houzé, Laurence Labat, Bruno Mégarbane, Cinzia Bocca, Pascal Reynier, Nicolas Guiblin, Sylvie Michel, Xavier Cachet","doi":"10.3390/molecules30061372","DOIUrl":"10.3390/molecules30061372","url":null,"abstract":"Plant-based food supplements (FS) of doubtful traceability have now emerged as a new threat to human health. Food supplements adulterated with pharmaceutical ingredients are considered \"medicines in disguise\" by regulatory authorities, which is a sub-category of falsified medicines. In the context of illegal manufacture and trade, as well as in the absence of an official phyto- and/or pharmacovigilance system, emergency departments and poison control centers constitute a early warning system for detecting ingested suspect FS. In the present investigation, we set up efficient workflows for the systematic characterization of adulterated plant-based FS in the context of an original local early warning alert system (i.e., FalsiMedTrack) involving an emergency department, a poison center, and academic analytical chemistry laboratories. Fit-for-purpose cross-analytical methods were employed, including sophisticated methods such as liquid chromatography coupled to high-resolution mass spectrometry, nuclear magnetic resonance, X-ray powder diffraction, as well as the most accessible and affordable HPLC method with UV/DAD detection. The strategy was applied successfully to typical cases of suspect plant-based health products, i.e., sample incriminated in patients experiencing side effects and herbal products currently commercialized for their \"amazing health benefits\". The samples contained active pharmaceutical ingredients, including diclofenac, piroxicam, dexamethasone 21-acetate, and sibutramine. We provided evidence of \"medicines in disguise\" presented as food supplements, which raises concerns about their quality and safety.","PeriodicalId":19041,"journal":{"name":"Molecules","volume":"30 6","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11944288/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143720583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0