Chemistry最新文献_第6页

Synthesis of Metal Nanoparticles via Pulicaria undulata and an Evaluation of Their Antimicrobial, Antioxidant, and Cytotoxic Activities 波浪形刺槐合成金属纳米颗粒及其抗菌、抗氧化和细胞毒活性的评价

Chemistry Pub Date : 2023-09-26 DOI: 10.3390/chemistry5040141

Yasser A. El-Amier, Balsam T. Abduljabbar, Mustafa M. El-Zayat, Tushar C. Sarker, Ahmed M. Abd-ElGawad

{"title":"Synthesis of Metal Nanoparticles via Pulicaria undulata and an Evaluation of Their Antimicrobial, Antioxidant, and Cytotoxic Activities","authors":"Yasser A. El-Amier, Balsam T. Abduljabbar, Mustafa M. El-Zayat, Tushar C. Sarker, Ahmed M. Abd-ElGawad","doi":"10.3390/chemistry5040141","DOIUrl":"https://doi.org/10.3390/chemistry5040141","url":null,"abstract":"Nanoparticle engineering via plants (green synthesis) is a promising eco-friendly technique. In this work, a green protocol was applied to the preparation of silver, zinc, and selenium nanoparticle solutions supported by the extracted aerial parts of Pulicaria undulata. The formation of nanoparticles in the solution was characterized using phytochemical analysis, and UV-visible, TEM, and zeta-potential spectroscopy. In addition, various biological activities were investigated for the extract of P. undulata and the produced nanoparticles (selenium, silver, and zinc), including antioxidant, antimicrobial, and cytotoxic activities. The volatile components of the extracted constitute verified the fact that twenty-five volatile components were characterized for the majority of abundant categories for the fatty acids, esters of fatty acids (59.47%), and hydrocarbons (38.19%) of the total area. The antioxidant activity of P. undulata extract and metal nanoparticles was assessed using DPPH assay. The results indicated reduced potency for the metal nanoparticles’ solutions relative to the results for the plant extract. The cytotoxicity of the investigated samples was assessed using an MTT assay against various tumor and normal cell lines with improved cytotoxic potency of the solutions of metal nanoparticles, compared to the plant extract. The antimicrobial activity was also estimated against various bacterial and fungal species. The results confirmed amended potency for inhibiting the growth of microbial species for the solutions of metal nanoparticles when compared to the extracted aerial parts of the plant. The present study showed that green synthetized nanoparticles using P. undulata have various potential bioactivities.","PeriodicalId":9850,"journal":{"name":"Chemistry","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134886810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Isoselenazole Synthesis by Rh-Catalyzed Direct Annulation of Benzimidates with Sodium Selenite 铑催化亚硒酸钠与苯并咪酯直接环化合成异硒唑

Chemistry Pub Date : 2023-09-23 DOI: 10.3390/chemistry5040140

Qing-Feng Xu-Xu, Yuji Nishii, Masahiro Miura

引用次数: 0

Direct Aniline Formation with Benzene and Hydroxylamine 苯和羟胺直接生成苯胺

Chemistry Pub Date : 2023-09-23 DOI: 10.3390/chemistry5040139

Ningyu Liu, Matthew D. Sleck, William D. Jones

引用次数: 0

In Pursuit of Next Generation N-Heterocyclic Carbene-Stabilized Copper and Silver Precursors for Metalorganic Chemical Vapor Deposition and Atomic Layer Deposition Processes 金属有机化学气相沉积和原子层沉积工艺中下一代n -杂环碳稳定铜和银前驱体的研究

Chemistry Pub Date : 2023-09-20 DOI: 10.3390/chemistry5030138

Ilamparithy Selvakumar, Nils Boysen, Marco Bürger, Anjana Devi

{"title":"In Pursuit of Next Generation N-Heterocyclic Carbene-Stabilized Copper and Silver Precursors for Metalorganic Chemical Vapor Deposition and Atomic Layer Deposition Processes","authors":"Ilamparithy Selvakumar, Nils Boysen, Marco Bürger, Anjana Devi","doi":"10.3390/chemistry5030138","DOIUrl":"https://doi.org/10.3390/chemistry5030138","url":null,"abstract":"Volatile, reactive, and thermally stable organometallic copper and silver complexes are of significant interest as precursors for the metalorganic chemical vapor deposition (MOCVD) and atomic layer deposition (ALD) of ultra-thin metallic films. Well-established CuI and AgI precursors are commonly stabilized by halogens, phosphorous, silicon, and oxygen, potentially leading to the incorporation of these elements as impurities in the thin films. These precursors are typically stabilized by a neutral and anionic ligand. Recent advancements were established by the stabilization of these complexes using N-heterocyclic carbenes (NHCs) as neutral ligands. To further enhance the reactivity, in this study the anionic ligand is sequentially changed from β-diketonates to β-ketoiminates and β-diketiminates, yielding two new CuI and two new AgI NHC-stabilized complexes in the general form of [M(NHC) (R)] (M = Cu, Ag; R = β-ketoiminate, β-diketiminate). The synthesized complexes were comparatively analyzed in solid, dissolved, and gaseous states. Furthermore, the thermal properties were investigated to assess their potential application in MOCVD or ALD. Among the newly synthesized complexes, the β-diketiminate-based [Cu(tBuNHC) (NacNacMe)] was identified to be the most suitable candidate as a precursor for Cu thin film deposition. The resulting halogen-, oxygen-, and silicon-free CuI and AgI precursors for MOCVD and ALD applications are established for the first time and set a new baseline for coinage metal precursors.","PeriodicalId":9850,"journal":{"name":"Chemistry","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136373757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High Thermal Stability of Enzyme-MOF Composites at 180 °C 酶- mof复合材料在180℃时的高热稳定性

Chemistry Pub Date : 2023-09-19 DOI: 10.3390/chemistry5030137

Shitong Cui, Jun Ge

{"title":"High Thermal Stability of Enzyme-MOF Composites at 180 °C","authors":"Shitong Cui, Jun Ge","doi":"10.3390/chemistry5030137","DOIUrl":"https://doi.org/10.3390/chemistry5030137","url":null,"abstract":"Encapsulating enzymes in a tailored scaffold is of great potential in industrial enzymatic catalysis, which can enhance the stability of enzymes thus expanding their applications. Metal–organic frameworks (MOFs) are emerging as promising candidates for enzyme encapsulation due to their precise pore structure, ease of synthesis and good biocompatibility. Despite the fact that enzymes encapsulated in MOFs can obtain enhanced stability, there has been little discussion about the thermal stability of enzyme-MOF composites in solid state under extremely high temperatures. Herein, we fabricated the enzyme-MOF composites, CALB-ZIF-8, via a convenient coprecipitation method in aqueous solution, which exhibited good thermal stability at 180 °C. It was found that the activity of CALB encapsulated in ZIF-8 retained nearly ~80% after heating for 10 min at 180 °C. A finite element method was applied to investigate the heat transfer process within a ZIF-8 model, indicating that the air filled in cavities of ZIF-8 played a significant role in hindering the heat transfer and this may be an important reason for the outstanding thermal stability of CALB-ZIF-8 at 180 °C, which paves a new path for expanding the industrial application of enzyme-MOF composites.","PeriodicalId":9850,"journal":{"name":"Chemistry","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135064106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Antimicrobial and Mosquitocidal Activity of Green Magnesium Oxide Nanoparticles Synthesized by an Aqueous Peel Extract of Punica granatum 石榴皮水提物制备的绿色氧化镁纳米颗粒的抗菌和杀蚊活性

Chemistry Pub Date : 2023-09-12 DOI: 10.3390/chemistry5030136

Amr Fouda, Khalid S. Alshallash, Mohammed I. Alghonaim, Ahmed M. Eid, Ahmed M. Alemam, Mohamed A. Awad, Mohammed F. Hamza

{"title":"The Antimicrobial and Mosquitocidal Activity of Green Magnesium Oxide Nanoparticles Synthesized by an Aqueous Peel Extract of Punica granatum","authors":"Amr Fouda, Khalid S. Alshallash, Mohammed I. Alghonaim, Ahmed M. Eid, Ahmed M. Alemam, Mohamed A. Awad, Mohammed F. Hamza","doi":"10.3390/chemistry5030136","DOIUrl":"https://doi.org/10.3390/chemistry5030136","url":null,"abstract":"An aqueous extract of Punica granatum peel was used as a biocatalyst for magnesium oxide nanoparticle (MgO-NP) synthesis, which was characterized via UV-Vis spectroscopy, TEM, EDX, FT-IR, XRD, DLS, and zeta potential. Data showed the efficacy of the plant aqueous extract in forming spherical, crystalline-nature, well-arranged MgO-NPs with sizes in the range of 10–45 nm with average sizes of 24.82 ± 8.85 nm. Moreover, EDX analysis revealed that the highest weight and atomic percentages were recorded for Mg and O ions. The green synthesized MgO-NPs showed antimicrobial activity against Bacillus subtilis, Staphylococcus aureus, E. coli, Pseudomonas aeruginosa, and Candida albicans in a concentration-dependent manner with clear zones in the range of 8.7 ± 0.6 to 19.7 ± 0.5 mm with various concentrations. Also, the MIC value was varied to be 25 µg mL−1 for Gram-negative bacteria, B. subtilis, and C. albicans and 50 µg mL−1 for S. aureus. Moreover, MgO-NPs showed high activity against the 3rd-instar larvae of Culex quinquefasciatus. The mortality percentages were concentration- and time-dependent. Data analysis showed that the highest mortality was 88.3 ± 3.2%, attained at a concentration of 100 µg mL−1 after 72 h. Also, all originated pupae were malformed and did not hatch to adults, with mortality percentages of 100% at all concentrations. Overall, the P. granatum-mediated MgO-NPs showed promising activity in inhibiting the growth of pathogenic microbes and the hatching of C. quinquefasciatus larvae to adults.","PeriodicalId":9850,"journal":{"name":"Chemistry","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135886217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Expanding Heteroaromatic and 2-Aminosugar Chemical Space Accessible from the Biopolymer Chitin 生物聚合物甲壳素扩展杂芳香族和2-氨基糖的化学空间

Chemistry Pub Date : 2023-09-09 DOI: 10.3390/chemistry5030135

Thaís A. Rossa, Jessica C. Neville, Seongmin Paul Jun, Tilo Söhnel, Jonathan Sperry

引用次数: 0

Short I⋯O Interactions in the Crystal Structures of Two 2-Iodo-Phenyl Methyl-Amides as Substrates for Radical Translocation Reactions 作为自由基易位反应底物的两种2-碘-苯基甲基酰胺晶体结构中的短I⋯O相互作用

Chemistry Pub Date : 2023-05-12 DOI: 10.3390/chemistry5020083

Ahtsham Ishaq, John M. D. Storey, William T. A. Harrison

引用次数: 0

Justus von Liebig 贾斯图斯-冯-李比希

Chemistry Pub Date : 2023-05-06 DOI: 10.3390/chemistry5020071

Siegfried Schindler