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131.
Alena Vollmannova Janettte Musilova Tomas Toth Julius Arvay Judita Bystricka Michal Medvecky 《International journal of environmental analytical chemistry》2013,93(14-15):1445-1451
The aim of this study was to determine the content of Cu, Zn, Cd and Pb and the total polyphenol (TP) content as well as the total antioxidant capacity (TAC) in wild cranberries and blueberries collected from different localities of the Slovakia and to compare them with properties of six cranberry and six highbush blueberry cultivars obtained from the research centre. Compared with cultivated cranberries (Cu, Zn, Cd and Pb content: 0.642, 1.496, 0.015 and 0.050 mg/kg FM) in wild fruits, higher Cu (by 37%) and lower Zn, Cd and Pb (by 8%, 7% and 44% respectively) were determined using atomic absorption spectrometry method. In wild blueberries, higher Cu, Zn and Pb (by 16%, 209% and 80% respectively) and similar Cd contents were determined compared with cultivated fruits (Cu, Zn, Cd and Pb content: 0.483, 0.541, 0.003 and 0.055 mg/kg FM). The TP contents estimated by spectrophotometry using Folin–Ciocalteau reagent were in intervals 1405–3161 (cranberries) and 1300–3077 (blueberries) expressed as mg GAE/kg FM. While the average TP content determined in wild cranberries was by 31% lower than that in cultivated cranberries, in wild blueberries it was by 97% higher compared with highbush blueberry cultivars. The values of TAC determined by spectrophotometry method using 2,2-diphenyl-1-picrylhydrazyl were in range 20.67–22.22 (cranberries) and 14.03–24.79 (blueberries) expressed as mmol TE/kg FM. In wild cranberries and blueberries, the lower average TAC values compared with cultivated berries were determined (by 1% and 28%, respectively). 相似文献
132.
Song J Šišková A Simons MG Kowalski WJ Kowalczuk MM van den Brink OF 《Journal of the American Society for Mass Spectrometry》2011,22(4):641-648
A comprehensive study using liquid chromatography electrospray ionization multistage mass spectrometry (LC-ESI MS
n
) was performed to get detailed structural information on poly(butylene adipate-co-butylene terephthalate) co-polyester and
its product of partial degradation. LC-MS and LC-MSn identified the existence of cyclic structures in the original samples that disappear completely during the degradation. The
occurrence of methanol transesterification in the degradation process was confirmed. MS2 on the first 13C isotope peak helped to determine the elemental composition of the fragments and facilitated end group determination. The
method can be used to provide an alternative for high mass accuracy MS2 experiments. Sequence information was also revealed for certain copolymeric structures. 相似文献
133.
The molecular mobility of solid deuterated tert-butyl alcohol (TBA) has been studied over a broad temperature range (103–283 K) by means of solid-state 2H NMR spectroscopy, including both line shape and anisotropy of spin–lattice relaxation analyses. It has been found that, while the hydroxyl group of the TBA molecule is immobile on the 2H NMR time scale (τC > 10(–5) s), its butyl group is highly mobile. The mobility is represented by the rotation of the methyl [CD3] groups about their 3-fold axes (C3 rotational axis) and the rotation of the entire butyl [(CD3)3-C] fragment about its 3-fold axis (C3′ rotational axis). Numerical simulations of spectra line shapes reveal that the methyl groups and the butyl fragment exhibit three-site jump rotations about their symmetry axes C3 and C3′ in the temperature range of 103–133 K, with the activation energies and preexponential factors E1 = 21 ± 2 kJ/mol, k(01) = (2.6 ± 0.5) × 10(12) s(–1) and E2 = 16 ± 2 kJ/mol, k(02) = (1 ± 0.2) × 10(12) s(–1), respectively. Analysis of the anisotropy of spin–lattice relaxation has demonstrated that the reorientation mechanism of the butyl fragment changes to a free diffusion rotational mechanism above 173 K, while the rotational mechanism of the methyl groups remains the same. The values of the activation barriers for both rotations at T > 173 K have the values, which are similar to those at 103–133 K. This indicates that the interaction potential defining these motions remains unchanged. The obtained data demonstrate that the detailed analysis of both line shape and anisotropy of spin–lattice relaxation represents a powerful tool to follow the evolution of the molecular reorientation mechanisms in organic solids. 相似文献
134.
It is known that cyclic configurations of a planar polygonal linkage are critical points of the signed area function. In the
paper we give an explicit formula of the Morse index for the signed area of a cyclic configuration. We show that it depends
not only on the combinatorics of a cyclic configuration, but also on its metric properties. 相似文献
135.
Miroslava Martinková Jozef Gonda Alena Uhríková Margaréta Kováčvá 《Chemical Papers》2011,65(4):527-535
5-O-(t-Butyldimethylsilyl)-3-deoxy-3-C-hydroxymethyl-1,2-O-isopropylidene-3-(methoxycarbonylamino)-α-d-xylofuranose IV has been proved to be an appropriate building block in the stereoselective synthesis of methyl (4S)-4-[(1′R)-1′-acetoxy-4′-oxobutyl]-3-benzyl-2-oxooxazolidine-4-carboxylate III representing the polar part of the naturally occurring mycestericins E and mycestericins G. 相似文献
136.
Adriana Šturcová Ji?í Dybal Alena Braunová Michal Pechar 《Vibrational Spectroscopy》2011,57(2):300-305
Temperature-induced micellization of CAE-85, a carboxylic acid end-standing derivative of a triblock copolymer Pluronic P85, was studied by attenuated total reflectance Fourier-transform infrared spectroscopy (ATR FTIR) and density functional theory (DFT) model calculations. It was found that in polymer micelles carboxyl end groups dissociated and it was a two stage process. The first stage of deprotonation appeared with the onset of micellization and it was in agreement with predictions of existing models and theories for ionization processes in micellar corona. In micelles well above the critical micellization temperature, the degree of CAE-85 deprotonation increased further to values significantly higher compared to unimer solution. It is proposed that such deprotonation correlates with the formation of hydrogen bonded carboxyl end groups enabled by sufficient density of chains in the corona of developing micelles. It was demonstrated that the proton dissociation constant, pKm, specific to the micellar form existed and was different from the proton dissociation constant of solution of unimers, pKa. 相似文献
137.
Quantitative evaluation of LAL productivity of colloidal nanomaterials: Which laser pulse width is more productive,ergonomic, and economic?
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Near-IR (wavelength ≈ 1 μm) laser ablation of bulk, chemically-inert gold in water was compared for different laser pulse width in broad the range of 300 fs-100 ns, comparing a number of key ablation characteristics: mass loss, single-shot crater volume and extinction coefficient of the generated colloidal solutions taken in the spectral ranges of interband transitions and localized plasmon resonance. Comparing to related air-based ablation results, at the given fluences laser ablation in the liquid resulted in the maximum ablation yield per unit energy and maximum NP yield per pulse and per unit energy for the picosecond lasers, occurring at subcritical peak pulse powers for laser self-focusing. The self-focusing effect was demonstrated to yield in incomplete, effectively weaker focusing in the water filaments of ultrashort laser pulses with supercritical peak powers, comparing to linear (geometrical) focusing at sub-critical peak powers. At the other, nanosecond-pulse extreme the high ablation yield per pulse, but low ablation yield per unit energy and low NP yield per pulse and per unit energy were related to strong ablation plasma screening, providing mass removal according to the well-established scaling relationships for plasma. Illustrative comparison of the ablation and nanoparticle generation efficiency versus the broad fs-ns laser pulse width range was enabled in terms of productivity, economicity, and ergonomicity, using the proposed universal quantitative criteria. 相似文献
138.
Alena Reznickova Zdenka Kolska Vladimir Hnatowicz Vaclav Svorcik 《Journal of nanoparticle research》2011,13(7):2929-2938
Properties of pristine, plasma modified, and etched (by water and methanol) polytetrafluoroethylene (PTFE) were studied. Gold
nanolayers sputtered on this modified PTFE have been also investigated. Contact angle, measured by goniometry, was studied
as a function of plasma exposure and post-exposure aging times. Degradation of polymer chains was examined by etching of plasma
modified PTFE in water or methanol. The amount of ablated and etched layer was measured by gravimetry. In the next step the
pristine, plasma modified, and etched PTFE was sputtered with gold. Changes in surface morphology were observed using atomic
force microscopy. Chemical structure of modified polymers was characterized by X-ray photoelectron spectroscopy (XPS). Surface
chemistry of the samples was investigated by electrokinetic analysis. Sheet resistance of the gold layers was measured by
two-point technique. The contact angle of the plasma modified PTFE decreases with increasing exposure time. The PTFE amount,
ablated by the plasma treatment, increases with the plasma exposure time. XPS measurements proved that during the plasma treatment
the PTFE macromolecular chains are degraded and oxidized and new –C–O–C–, –C=O, and –O–C=O groups are created in modified
surface layer. Surface of the plasma modified PTFE is weakly soluble in methanol and intensively soluble in water. Zeta potential
and XPS shown dramatic changes in PTFE surface chemistry after the plasma exposure, water etching, and gold deposition. When
continuous gold layer is formed a rapid decrease of the sheet resistance of the gold layer is observed. 相似文献
139.
Sharipov Bulat T. Davidova Anna N. Ryabova Alena S. Galimzyanova Nailya F. Valeev Farid A. 《Chemistry of Heterocyclic Compounds》2019,55(1):31-37
Chemistry of Heterocyclic Compounds - A series of derivatives were synthesized on the basis of levoglucosenone that contained hydroxy groups at the С-4 atom or С-2 and С-4 atoms... 相似文献
140.
Daniel Depes Jin-Ho Lee Elizaveta Bobkova Lucie Jezkova Iva Falkova Felix Bestvater Eva Pagacova Olga Kopecna Mariia Zadneprianetc Alena Bacikova Elena Kulikova Elena Smirnova Tatiana Bulanova Alla Boreyko Evgeny Krasavin Michael Hausmann Martin Falk 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2018,72(9):158