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Substitution effect of phenol derivatives on electrochemical oxidation potentials: Correlation of theoretical reaction Gibbs free energies 苯酚衍生物对电化学氧化电位的取代效应:理论反应吉布斯自由能的相关性
IF 0.8 Pub Date : 2024-01-01 DOI: 10.2478/acs-2024-0002
Andrea Kováčová
Reaction Gibbs free energies for electron abstraction from phenol and its 74 derivatives were calculated using the composite ab-initio approach (G4) in combination with the implicit solvation model. Resulting values were correlated with 38 oxidation potentials obtained from cyclic voltammetry measurements. Substitution effect and the role of substituents in ortho-, meta-, and para-position were also quantified by Hammett constants. The evaluated linear dependences can be used to reliably estimate electrochemical potentials of substituted phenols solvated in water.
采用复合非线性方法 (G4) 并结合隐式溶解模型,计算了苯酚及其 74 种衍生物抽取电子的反应吉布斯自由能。计算结果与循环伏安法测量得到的 38 个氧化电位相关联。此外,还通过哈米特常数对正位、偏位和对位取代基的取代效应和作用进行了量化。所评估的线性关系可用于可靠地估计溶于水的取代酚的电化学电位。
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引用次数: 0
Atomic partial charge model in chemistry: chemical accuracy of theoretical approaches for diatomic molecules 化学中的原子偏电荷模型:二原子分子理论方法的化学准确性
IF 0.8 Pub Date : 2024-01-01 DOI: 10.2478/acs-2024-0001
Matej Uhliar
Atomic partial charges cannot be physically measured but they play a significant role in many chemical theories and theoretical models. Therefore, they are, evaluated from experimentally acquired properties or calculated by quantum chemistry computational methods. This study is focused on determining chemical accuracy of various theoretical methods of computing atomic partial charges based on quantum chemistry. Values of gas-phase atomic partial charges were acquired by Mulliken (MUL) population analysis, natural bond analysis (NBO), Merz-Singh-Kollman (MSK) scheme, and atomic polar tensor (APT) charges computed considering Density Functional Theory and ab initio Møller-Plesset up to the second order levels. Correlations between the calculated values were determined by principal component analysis (PCA) and further confirmed by linear regression. The best agreement between experimentally evaluated atomic partial charges and theoretical values was obtained with the MSK scheme.
原子偏电荷无法进行物理测量,但它们在许多化学理论和理论模型中发挥着重要作用。因此,原子偏电荷可以通过实验获得的性质进行评估,也可以通过量子化学计算方法进行计算。本研究的重点是确定基于量子化学计算原子偏电荷的各种理论方法的化学准确性。气相原子偏电荷值是通过 Mulliken(MUL)种群分析、自然键分析(NBO)、Merz-Singh-Kollman(MSK)方案以及根据密度泛函理论和 ab initio Møller-Plesset 二阶水平计算的原子极性张量(APT)电荷获得的。计算值之间的相关性通过主成分分析(PCA)确定,并通过线性回归进一步确认。实验评估的原子偏电荷和理论值之间的最佳一致性是通过 MSK 方案获得的。
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引用次数: 0
Colour masterbatches and their use in polylactic acid fibres dyeing 色母粒及其在聚乳酸纤维染色中的应用
IF 0.8 Pub Date : 2023-01-01 DOI: 10.2478/acs-2023-0006
Agáta Hudecová, M. Hricová, M. Petkova, R. Plavec, Z. Tomčíková, A. Ujhelyiová
Abstract This article is focused on the preparation of colour masterbatches from renewable sources based on polylactic acid, which were modified with inorganic pigments. Titanium dioxide, carbon black, and iron oxides were used as inorganic pigments. Due to the composition of the prepared colour PLA masterbatches, the influence of the inorganic pigment on the rheological and thermal properties was monitored. Rheological properties were determined using a capillary viscosimeter and a rotary rheoviscosimeter with a geometry plate/plate. The colour PLA masterbatches prepared in this way were subsequently used to dye polylactic acid fibres in the mass. The prepared fibres were drawn to the maximum drawn ratio λmax. In case of fibres, the influence of composition and drawn ratio on thermal and mechanical properties was monitored.
摘要以无机颜料改性聚乳酸为原料,利用可再生资源制备色母粒。二氧化钛、炭黑和氧化铁被用作无机颜料。由于所制备的彩色PLA母料的组成,监测了无机颜料对流变学和热性能的影响。使用毛细管粘度计和具有几何板/板的旋转流变粘度计测定流变特性。以这种方式制备的彩色PLA母料随后用于对质量中的聚乳酸纤维进行染色。制备的纤维被拉伸至最大拉伸比λmax。在纤维的情况下,监测成分和拉伸比对热性能和机械性能的影响。
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引用次数: 0
Thermal- and light-induced SCO effect in Fe(II) complexes and coordination polymers Fe(II)配合物和配位聚合物中的光和热诱导SCO效应
IF 0.8 Pub Date : 2023-01-01 DOI: 10.2478/acs-2023-0003
Alexandra Šagátová, Barbora Brachňaková, Ivan Šalitroš
Abstract The review presents several families of spin crossover (SCO) active Fe(II) coordination compounds with photoactive N-donor heterocyclic ligands, in which the photoinduced structural changes can activate reversible change of spin state and thus control magnetic properties under isothermal conditions. Detailed description of structural, spectral, and magnetic behavior for selected examples of photoisomerizable coordination compounds are provided. From the application point of view, light is an excellent tool to control SCO properties. The first and best known approach called Light Induced Excited Spin State Trapping (LIESST) has a significant technological limitation due to low temperatures (< 120 K) required for the trapping and existence of photoexcited metastable states. The second and more elegant approach known as Ligand-Driven Light-Induced Spin Crossover (LD-LISC) seems to be a very suitable strategy utilizing light-induced structural changes to control the spin. Isomerization of photoswitchable groups, such as azobenzenes or stilbenes, can cause reversible transformation between two isomeric forms after exposition to selective wavelengths at ambient temperature. A very recent third approach, the Guest-Driven Light-Induced Spin Crossover (GD-LISC) effect employing the photoisomerizable guest molecules to control the spin state has also been introduced.
摘要综述了几种具有光活性N-供体杂环配体的自旋交叉(SCO)活性Fe(II)配位化合物家族,其中光诱导的结构变化可以激活自旋状态的可逆变化,从而控制等温条件下的磁性能。提供了可光异构化配位化合物的选定实例的结构、光谱和磁性行为的详细描述。从应用的角度来看,光是控制SCO特性的极好工具。第一种也是最为人所知的方法称为光诱导激发自旋态捕获(LIESST),由于捕获和存在光激发亚稳态所需的低温(<120K),具有显著的技术限制。第二种也是更优雅的方法,称为配体驱动的光诱导自旋交叉(LD-LISC),似乎是一种非常合适的策略,利用光诱导的结构变化来控制自旋。光可切换基团,如偶氮苯或二苯乙烯的异构化,在环境温度下暴露于选择性波长后,可以导致两种异构形式之间的可逆转变。最近的第三种方法,利用可光异构化的客体分子来控制自旋状态的客体驱动光诱导自旋交叉(GD-LISC)效应也被引入。
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引用次数: 0
Utilization of Opuntia as an alternative ingredient in value added bread and pasta products 仙人掌作为附加值面包和意大利面产品的替代成分的利用
IF 0.8 Pub Date : 2023-01-01 DOI: 10.2478/acs-2023-0005
Tatiana Holkovičová, Z. Kohajdová, Michaela Lauková, Lucia Minarovičová
Abstract Natural sources and healthy cereal-based food have recently received a lot of attention by both professionals and the common population for improving overall well-being. In this case, Opuntia cactus and Opuntia derivates show high potential in the production of health-promoting cereal-based products. This study comprehensively reviews nutritional composition, health benefits of Opuntia spp. and its utilisation in the production of bread and pasta products. Moreover, the effect of this ingredient on the rheological properties of wheat dough and physical parameters as well as sensory properties of incorporated products is also discussed.
摘要天然来源和健康的谷类食品最近因改善整体健康状况而受到专业人士和普通民众的广泛关注。在这种情况下,仙人掌和仙人掌衍生物在生产健康促进谷物产品方面显示出很高的潜力。本研究全面综述了仙人掌的营养成分、健康益处及其在面包和面食生产中的应用。此外,还讨论了该成分对小麦面团流变特性、物理参数以及掺入产品感官特性的影响。
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引用次数: 0
Stability of ferrate during long-term storage 高铁酸盐长期贮存的稳定性
IF 0.8 Pub Date : 2023-01-01 DOI: 10.2478/acs-2023-0004
Michaela Benköová, E. Mališová, P. Peciar, Adam Guštafík, J. Híveš
Abstract Surface water and groundwater are polluted with pharmaceuticals, detergents, pesticides, and many other substances. Application of ferrates seems to be a perspective option for wastewater treatment as ferrates are not only powerful oxidizing agents but also an excellent disinfecting and coagulating agents decomposing many stable inorganic, organic, and biological compounds. Final products of their decomposition do not include carcinogenic or toxic products. In this paper, stability of electrochemically prepared potassium ferrate encapsulated in packaging materials printed on a 3D printer was monitored. In the experiment, electrochemically prepared potassium ferrate with different purity (21.4 %, 63.5 % and 67.3 %) was used. Stability of potassium ferrate was monitored for one month and that of other ferrates for three months. Different storage conditions of ferrate samples were also compared. Storage conditions had a significant influence on the ferrate stability.
地表水和地下水受到药品、洗涤剂、杀虫剂和许多其他物质的污染。高铁酸盐的应用似乎是废水处理的一个前景选择,因为高铁酸盐不仅是强氧化剂,而且是一种优秀的消毒和混凝剂,可以分解许多稳定的无机、有机和生物化合物。它们分解的最终产物不包括致癌或有毒的产物。利用3D打印机对电化学制备的高铁酸钾封装在包装材料中的稳定性进行了监测。实验采用电化学法制备高铁酸钾,纯度分别为21.4%、63.5%和67.3%。高铁酸钾的稳定性监测为1个月,其他高铁酸盐的稳定性监测为3个月。并对不同贮藏条件下高铁酸盐样品进行了比较。贮藏条件对高铁酸盐的稳定性有显著影响。
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引用次数: 0
Extraction of bioactive coumarins from lime peel as sample pretreatment before chromatographic analysis 从酸橙皮中提取生物活性香豆素作为样品色谱前预处理
Pub Date : 2023-01-01 DOI: 10.2478/acs-2023-0007
Lucia Krasňanská, Katarína Hroboňová, Andrea Špačková
Abstract Analysis of lime peel was applied to assess their suitability for various intended purposes, e.g., application in perfumery, cosmetics, and cleaning products, or as a source of bioactive or other value-added compounds. Targeted analysis allows wider usability of the waste part of these natural materials. In the present study, a novel, efficient, lab-simple, time-saving analytical method for coumarins determination in lime peel, including sample pretreatment by extraction and quantification by HPLC with fluorescence detection (FLD), is introduced. Optimal conditions of ultrasound assisted extraction included water as extraction solvent, temperature of 40 °C, and extraction time of 10 min. A magnetic molecularly imprinted polymer was employed as solid phase extraction adsorbent for primary extract cleaning, isolation, and enrichment of coumarins before chromatographic analysis. Recovery of herniarin and umbelliferone was more than 86 % ((RSD ≤ 4.8 %). Linear range of 50—1000 ng/mL with correlation coefficient above 0.998 was obtained for the proposed HPLC-FLD method. The limit of quantification was 8.2 and 44 ng/mL for herniarin and umbelliferone, respectively. These results show that the proposed sample pretreatment procedure is suitable for analytical purposes and is perspective also for the analysis of other citrus samples, as well as for future scale-up preparative isolation of bioactive coumarins from citrus peel.
对酸橙皮进行了分析,以评估其在各种预期用途中的适用性,例如,在香水、化妆品和清洁产品中的应用,或作为生物活性或其他增值化合物的来源。有针对性的分析可以使这些天然材料的废料部分得到更广泛的利用。本文介绍了一种高效、简便、省时的酸橙皮香豆素分析方法,包括样品提取预处理和荧光检测(FLD)高效液相色谱(HPLC)定量。超声辅助提取的最佳条件为:水为提取溶剂,温度为40℃,提取时间为10 min。采用磁性分子印迹聚合物作为固相萃取吸附剂,对香豆素进行一次萃取清洗、分离和富集,然后进行色谱分析。herniarin和bellliferone的回收率大于86% (RSD≤4.8%)。HPLC-FLD法在50 ~ 1000 ng/mL的线性范围内,相关系数大于0.998。herniarin和bellliferone的定量限分别为8.2和44 ng/mL。这些结果表明,所提出的样品前处理方法适用于分析目的,也适用于其他柑橘样品的分析,以及将来从柑橘皮中大规模制备分离生物活性香豆素。
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引用次数: 0
DFT studies of camptothecins cytotoxicity IV — active and inactive forms of irinotecan 喜树碱细胞毒性的DFT研究Ⅳ——伊立替康的活性和非活性形式
IF 0.8 Pub Date : 2023-01-01 DOI: 10.2478/acs-2023-0001
M. Štekláč, M. Breza
Abstract Structures of irinotecan (CPT-11) in neutral lactone, neutral carboxyl, and anionic carboxylate forms in singlet ground states and of their complexes with Cu(II) in doublet ground states are optimized using B3LYP/6-311G* treatment. Metal ion affinities (MIA), Cu charges and Laplacians of Cu-ligand bond critical points of possible CPT active sites are evaluated. The formation of Cu(II) complexes with the anionic carboxylate ligand leads to the release of CO2 that can cause a decrease in the concentration of the active lactone form due to equilibria between all forms of the drug. MIA values and electron density transfer to Cu increase in the sequence lactone < neutral carboxyl < anionic carboxylate. Both neutral forms of irinotecan exhibit lower MIA values than those of camptothecin, unlike the anionic carboxylate form.
采用B3LYP/6-311G*处理,优化了伊立替康(CPT-11)单重态中性内酯、中性羧基和阴离子羧酸盐形态及其与Cu(II)双重态配合物的结构。评价了金属离子亲和力(MIA)、Cu电荷和CPT可能活性位点的Cu-配体键临界点laplacian。铜(II)配合物与阴离子羧酸配体的形成导致二氧化碳的释放,由于药物的所有形式之间的平衡,二氧化碳的释放会导致活性内酯形式的浓度降低。内酯<中性羧基<阴离子羧酸盐的MIA值和向Cu转移的电子密度增大。两种中性形式的伊立替康表现出比喜树碱更低的MIA值,不像阴离子羧酸形式。
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引用次数: 0
Study on secondary metabolites of Trichoderma atroviride F742 and their role in antibiosis atroviride木霉F742次生代谢产物及其抗菌作用的研究
IF 0.8 Pub Date : 2023-01-01 DOI: 10.2478/acs-2023-0002
Tomáš Pagáč, Zuzana Kubová, J. Víglaš, Zuzana Kavalová, P. Olejníková
Abstract Soil-borne pathogenic fungi responsible for serious damage in agriculture are widely distributed. Traditional approach to control these pathogens leads to the use of chemical fungicides, many of which have proven harmful side effects on the environment. Mycoparasitic fungi of the genus Trichoderma have been used for pathogens biocontrol as well as for their ability to promote plant growth. As increased mycoparasitic activity of mutant strain Trichoderma atroviride F742 has been observed, its use as a biocontrol agent might be considered. In this work, we focused on mycoparasitic activity of the strain T. atroviride F742 prepared by UV mutagenesis (from parental strain T. atroviride F534) and the physiological role of T. atroviride metabolites in antibiosis. T. atroviride F742 shows remarkable mycoparasitic activity attacking and colonizing phytopathogens (Alternaria alternata, Botrytis cinerea, Fusarium culmorum). Its isolated metabolites inhibit the growth of bacteria, yeasts, and fungi Candida albicans, A. alternata and F. culmorum. As different expression patterns in the secondary metabolites production of ABC transporters have been observed, we suggest their role in transport of secondary metabolites produced by T. atroviride F742.
摘要造成农业严重危害的土传病原真菌分布广泛。控制这些病原体的传统方法导致使用化学杀菌剂,其中许多杀菌剂已被证明对环境有害。木霉属真菌寄生真菌已被用于病原体的生物控制以及促进植物生长的能力。由于已经观察到变异菌株曲霉菌F742的真菌寄生活性增加,因此可以考虑将其用作生物防治剂。在这项工作中,我们重点研究了通过紫外线诱变制备的T.atroviride F742菌株(来自亲本T.atrovilide F534)的真菌寄生活性以及T.atrovirade代谢产物在抗菌中的生理作用。T.atroviride F742表现出显著的真菌寄生活性,可攻击和定植植物病原体(Alternaria alternata、Botrytis cinerea、Fusarium tumorum)。其分离的代谢产物抑制细菌、酵母和真菌白色念珠菌、A.alternata和F.tumorum的生长。由于已经观察到ABC转运蛋白在次级代谢产物产生中的不同表达模式,我们认为它们在T.atroviride F742产生的次级代谢产物的转运中的作用。
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引用次数: 0
Simultaneous detection of purine metabolites by membrane modified electrochemical sensors 膜修饰电化学传感器同时检测嘌呤代谢产物
IF 0.8 Pub Date : 2022-01-01 DOI: 10.2478/acs-2022-0007
J. Blaskovicová, Andrea Purdesová
Abstract Purine metabolites are important for metabolic and cellular processes. Deregulation of purinergic signaling leads to pathological accumulation of purine degradation products in extracellular fluids and indicates various diseases. In clinical diagnosis at early stages of related diseases, accurate detection of Uric acid and Xanthine is of high importance. Electrochemical methods are fast, simple, sensitive, more convenient, and cost-effective compared to other analytical methods used in purine metabolites signaling. Electrochemical sensors are able to detect more compounds simultaneously. Modification of a glassy carbon electrode sensor with external protective membranes was used in this study to avoid unwanted signal interferences from analyte matrices. Polyvinyl alcohol, Chitosan, and Nafion membranes were selected for sensor modification to compare the electro-neutral, positive and negative charged setting of the Xanthine and Uric acid detection. All three membrane modified sensors showed adequate stability in the phosphate buffer solution after 5 min of incubation and are thus suitable for simultaneous detection of purine metabolites. The best results in anodic peak current response values were observed using the Nafion membrane modified glassy carbon electrode sensor. The approach reported here can be useful for the detection of purine metabolites from various matrices at early stages of clinical diagnosis.
摘要嘌呤代谢产物对代谢和细胞过程很重要。嘌呤能信号的失调导致嘌呤降解产物在细胞外液中的病理性积累,并指示各种疾病。在相关疾病的早期临床诊断中,准确检测尿酸和黄原酸具有重要意义。与嘌呤代谢产物信号传导中使用的其他分析方法相比,电化学方法快速、简单、灵敏、更方便、成本效益高。电化学传感器能够同时检测更多的化合物。本研究中使用了带有外部保护膜的玻璃碳电极传感器的改进,以避免分析物基质的不必要信号干扰。选择聚乙烯醇、壳聚糖和Nafion膜进行传感器修饰,以比较黄原酸和尿酸检测的电中性、正电荷和负电荷设置。所有三种膜修饰的传感器在培养5分钟后在磷酸盐缓冲溶液中显示出足够的稳定性,因此适合于同时检测嘌呤代谢产物。使用Nafion膜修饰的玻碳电极传感器观察到阳极峰值电流响应值的最佳结果。本文报道的方法可用于在临床诊断的早期阶段检测各种基质中的嘌呤代谢产物。
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引用次数: 1
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Acta Chimica Slovaca
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