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排序方式: 共有105条查询结果,搜索用时 31 毫秒
1.
Veronika Barii Milica Cvijeti Stokanovi Ivana Flanjak Kristina Doko Antun Jozinovi Jurislav Babi Drago ubari Borislav Mili
evi Ines Cindri urica A
kar 《Molecules (Basel, Switzerland)》2020,25(22)
Chocolate is considered as both caloric and functional food. Its nutritional properties may be improved by addition of fiber; however, this may reduce polyphenols content. The aim of this research was to determine the influence of cocoa shell addition (as a source of fiber) and its combination with different ingredients (cocoa butter equivalents (CBE), emulsifiers, dairy ingredients) on polyphenols of dark and milk chocolates. Total polyphenol (TPC) and total flavonoid (TFC) contents were determined spectrophotometrically, identification and quantification of individual compounds by high pressure liquid chromatography and antioxidant capacity by ferric reducing antioxidant power (FRAP) assay. Results showed that even though addition of cocoa shell to chocolate results in reduced contents of TPC, TFC, and individual compounds, it is not significant compared to ones reported by other authors for commercial chocolates. Other ingredients influence determined values for all investigated parameters; however, additional research is needed to reveal exact mechanisms and implications. 相似文献
2.
Jon Babi Linglan Zhu Angela Lin Azalea Uva Hana El-Haddad Atang Peloewetse Helen Tran 《Journal of polymer science. Part A, Polymer chemistry》2021,59(21):2378-2404
Sequence-defined polymers can be programmed to self-assemble into precise nanostructures for applications in biosensing, drug delivery, optics, and molecular computation. Inspired by the natural self-assembly processes present in biological protein and DNA systems, sets of molecular design rules have emerged across materials classes as instructions to build a variety of tunable structures. This review highlights recent advances in self-assembled sequence-defined and sequence-specific polymers across peptides, peptoids, DNA, and non-biological synthetic materials, with a focus on synthesis, assembly processes and overall structure. Specifically, these self-assembled structures are free-floating, as such constructs can potentially serve as a platform for the aforementioned applications. Emphasis is placed on the molecular design of polymers that self-assemble into zero-dimensional, one-dimensional, two-dimensional, or three-dimensional nanostructures. With the development of automated syntheses and increasing control over self-assembly, future work may focus on emerging classes of compatible hybrid materials with exciting directions toward new architectures and applications. 相似文献
3.
Đ. Petrović A. Đukić K. Kumrić B. Babić M. Momčilović N. Ivanović Lj. Matović 《Journal of Radioanalytical and Nuclear Chemistry》2014,302(1):217-224
Ordered mesoporous carbon (OMC) was used as an adsorbent for the removal of pertechnetate (TcO4 ?) anion. The maximum uptake (93 %) of TcO4 ? was obtained after 60 min of contact. The adsorption of TcO4 ? is almost pH-independent in very wide pH region (from 4.0 to 10.0). Maximum K d of 6.6 × 103 cm3 g?1 was found at pH 2.0. TcO4 ? interacts with carboxylic functional groups present at the surface of the OMC by displacing the OH? ions with TcO4 ? via ion exchange mechanism. 相似文献
4.
Glavnik Vesna Simonovska Breda Vovk Irena Pavlović Dragana Mutavdžić Ašperger Danijela Babić Sandra 《平面色谱法杂志一现代薄层色谱法》2011,24(6):482-486
JPC – Journal of Planar Chromatography – Modern TLC - Validation of a method for the quantification of (−)-epicatechin and procyanidin B2 in chocolates is reported. After a simple... 相似文献
5.
Simultaneous determination of pharmaceuticals and some of their metabolites in wastewaters by high performance liquid chromatography with tandem mass spectrometry 下载免费PDF全文
The present work describes the development of a sensitive and reliable analytical method based on solid‐phase extraction followed by analysis using liquid chromatography with tandem mass spectrometry for the simultaneous determination of pharmaceuticals from antibiotics (fluoroquinolones, sulfonamides, and their N4‐acetyl metabolites, and trimethoprim as sulfonamides synergist) and anthelmintics groups. SPE was optimized using different cartridges (Strata‐X, Oasis HLB, Strata C18‐E, Isolute C18, SampliQ C8/Si‐SCX). The highest recovery was achieved using Strata X cartridge (>80%) with good reproducibility (RSDs < 5%) despite various physicochemical properties of the compounds. Investigated analytes were identified and quantitatively determined by liquid chromatography with tandem mass spectrometry using multiple reaction monitoring. The method was shown to be linear over the concentration range of 0.05–30 μg/L for febantel and albendazole, and 0.10–60 μg/L for all other pharmaceuticals. Correlation coefficients were >0.99 for all compounds except for sulfamethazine (0.98). In order to demonstrate the applicability of the developed method, wastewater from the veterinary industry was analyzed. Results evidenced the presence of febantel, praziquantel, albendazole, enrofloxacin, sulfamethazine, and sulfadiazine. 相似文献
6.
Edit Csapó Dániel Sebők Julia Makrai Babić Filip Šupljika Gabriella Bohus Imre Dékány 《Journal of Dispersion Science and Technology》2014,35(6):815-825
Gold nanoparticles reduced by sodium citrate (d ~ 10 nm) and purchased gold colloid particles (d ~ 500 nm) were examined and compared. The properties of both gold particles and their biofunctionalized derivatives with L-cysteine and L-glutathione were studied in the presence of sodium nitrate. The structural investigations indicated an aggregated inner structure. The isoelectric points of pure gold, citrate reduced gold, and functionalized gold were measured and compared. The low isoelectric point of pure gold/water interface was explained by considering the distribution and accumulation of H+ and OH? ions within the interfacial water layer, being more pronounced for OH? ions. 相似文献
7.
D. Milivojevi?B. Babi?-Stoji? V. Jokanovi?Z. Jagli?i? D. Makovec 《Journal of magnetism and magnetic materials》2011,323(6):805-812
Samples of Mn-oxide nanoparticles dispersed in an amorphous SiO2 matrix with manganese concentration 0.7 and 3 at% have been synthesized by a sol-gel method. Transmission electron microscopy analysis has shown that the samples contain agglomerates of amorphous silica particles 10-20 nm in size. In silica matrix two types of Mn-rich particles are dispersed, smaller nanoparticles with dimensions between 3 and 10 nm, and larger crystalline areas consisting of aggregates of the smaller nanoparticles. High-temperature magnetic susceptibility study reveals that dominant magnetic phase at higher temperatures is λ-MnO2. At temperatures below TC=43 K strong ferrimagnetism originating from the minor Mn3O4 phase masks the relatively weak magnetism of λ-MnO2 with antiferromagnetic interactions. Magnetic field dependence of the maximum in the zero-field-cooled magnetization for both the samples in the vicinity of 40 K, and a frequency shift of the real component of the ac magnetic susceptibility in the sample with 3 at% Mn suggest that the magnetic moments of the smaller Mn3O4 nanoparticles with dimensions below 10 nm are exposed to thermally activated blocking process just below the Curie temperature TC. Appearance of a maximum in the zero-field-cooled magnetization for both the samples below 10 K indicates possible spin glass freezing of the magnetic moments at low temperatures which might occur in the geometrically frustrated Mn sublattice of the λ-MnO2 crystal structure. 相似文献
8.
The existence of ferromagnetism in Zn-Mn-O semiconductor samples and dependence on the preparation condition were investigated. We systematically examined the samples with manganese concentration ranging from 0 to 10 at.%, prepared by a solid state reaction route using (ZnC2O4·2H2O)1−x and (MnC2O4·2H2O)x as precursors. Thermal treatment was carried out in air at temperatures ranging from 400 to 900 °C. The samples were investigated by X-ray diffraction, transmission electron microscopy, magnetization measurements and XPS spectroscopy. XPS surface composition, chemical analysis and depth profiling were successfully employed on powder revealing the chemical composition at the surface of the grains and underneath. The present investigation suggests that physical properties and observed room temperature ferromagnetism might be due to grain surface effects. It seems that the ferromagnetic phase is correlated with oxygen build up at the surface. 相似文献
9.
Horvat Alka J. M. Živko-Babić Jasenka Ivanković Danijela Babić Sandra Kaštelan-Macan Marija 《平面色谱法杂志一现代薄层色谱法》2001,14(6):426-429
JPC – Journal of Planar Chromatography – Modern TLC - Knowledge of the composition of an incorporated alloy is a precondition for avoiding polymetallism in subsequent prosthetic... 相似文献
10.
Dragana Mutavdžić Pavlović Danijela Ašperger Dijana Tolić Sandra Babić 《Journal of separation science》2013,36(18):3042-3049
This paper describes the development, optimization, and validation of a method for the determination of five pharmaceuticals from different therapeutic classes (antibiotics, anthelmintics, glucocorticoides) in water samples. Water samples were prepared using SPE and extracts were analyzed by HPLC with diode‐array detection. The efficiency of 11 different SPE cartridges to extract the investigated compounds from water was tested in preliminary experiments. Then, the pH of the water sample, elution solvent, and sorbent mass were optimized. Except for optimization of the SPE procedure, selection of the optimal HPLC column with different stationary phases from different manufacturers has been performed. The developed method was validated using spring water samples spiked with appropriate concentrations of pharmaceuticals. Good linearity was obtained in the range of 2.4–200 μg/L, depending on the pharmaceutical with the correlation coefficients >0.9930 in all cases, except for ciprofloxacin (0.9866). Also, the method has revealed that low LODs (0.7–3.9 μg/L), good precision (intra‐ and interday) with RSD below 17% and recoveries above 98% for all pharmaceuticals. The method has been successfully applied to the analysis of production wastewater samples from the pharmaceutical industry. 相似文献