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11.
Rim Ben Abdallah Ana Belén Bautista-Ortin Tesnime Ghazouani Wafa Talbi Maria D. Jiménez-Martinez Encarna Gómez-Plaza Sami Fattouch 《International Journal of Food Science & Technology》2019,54(5):1633-1641
During technological processing, proanthocyanidins and anthocyanidins could be partly lost due to the complexation phenomena, affecting food and beverage nutritional properties, organoleptic properties and health-promoting potentials. A common issue is encountered when processing food and beverage which is binding of phenolics to dietary proteins. The present investigation aims at evaluating the proteolysis contribution, using pure protease (Pepsin, 3000 units g−1), to protein–anthocyanidin and protein–proanthocyanidin interactions. Bovine serum albumin (BSA), ovalbumin (OVA) and casein (CAS) dietary protein models were used. High-performance liquid chromatography coupled to diode array detector (HPLC-DAD) and size exclusion chromatography analyses proved that pepsin treatment significantly (P > 0.05) decreased the ratio of flavonoids’ interaction with tested proteins . The proteolysis reduced anthocyanidin interactions with CAS, OVA and BSA by 64.88%, 57.37% and 42.87% respectively. Similarly, proanthocyanidins interaction with CAS, OVA and BSA were reduced by 34.23%, 13.74% and 2.39% respectively. This study provides the basis to develop innovative technologies to limit protein–flavonoid complexation during food and beverage processing. 相似文献
12.
13.
Hongyan Chen Hung-Hsiang Yang Timo Frauhammer Haoran You Qing Sun Peter Nagel Stefan Schuppler Ana Belén Gaspar José Antonio Real Wulf Wulfhekel 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(22):2300251
Spin crossover (SCO) complexes sensitively react on changes of the environment by a change in the spin of the central metallic ion making them ideal candidates for molecular spintronics. In particular, the composite of SCO complexes and ferromagnetic (FM) surfaces would allow spin-state switching of the molecules in combination with the magnetic exchange interaction to the magnetic substrate. Unfortunately, when depositing SCO complexes on ferromagnetic surfaces, spin-state switching is blocked by the relatively strong interaction between the adsorbed molecules and the surface. Here, the Fe(II) SCO complex [FeII(Pyrz)2] (Pyrz = 3,5-dimethylpyrazolylborate) with sub-monolayer thickness in contact with a passivated FM film of Co on Au(111) is studied. In this case, the molecules preserve thermal spin crossover and at the same time the high-spin species show a sizable exchange interaction of > 0.9 T with the FM Co substrate. These observations provide a feasible design strategy in fabricating SCO-FM hybrid devices. 相似文献
14.
Evaluation of postharvest calcium treatment and biopreservation with Lactobacillus rhamnosus GG on the quality of fresh‐cut ‘Conference’ pears 下载免费PDF全文
15.
The goal of this work was to analyze the effect of different treatments on functional properties (Color parameters, water holding capacity, oil holding capacity, water imbibition capacity, protein solubility and apparent viscosity) and microstructure of three cowpea varieties. Proteins present in flours obtained from heat-treated seeds exhibited a significant increase in water and oil absorption values, water imbibition capacity, and apparent viscosity, whereas solubility decreased. Color determinations on flours showed a reduction in L* and H*, and an increment in C* with treatment intensity. Structural changes in seeds would explain the variations in the functionality of flours. This study shows that cooking and autoclaving affect significantly the functional properties of flours, while soaking had a lower impact. The knowledge about these changes will be very useful for developing and obtaining new preparations based on cowpea flour. 相似文献
16.
A method to determine the refractive index and thickness of silver halide emulsions used in holography is presented. The emulsions are in the form of a layer of film deposited on a thick glass plate. The experimental reflectances of p-polarized light are measured as a function of the incident angles, and the values of refractive index, thickness, and extinction coefficient of the emulsion are obtained by using the theoretical equation for reflectance. As examples, five commercial holographic silver halide emulsions are analyzed. The procedure to obtain the measurements and the numerical analysis of the experimental data are simple, and agreement of the calculated reflectances, by use of the thickness and refractive index obtained, with the measured reflectances is satisfactory. 相似文献
17.
Summary Empirical evidence is given on how membership in a consolidated, well-established research team provides researchers with
some competitive advantage as compared to their colleagues in non-consolidated teams. Data were obtained from a survey of
researchers ascribed to the 'Biology and Biomedicine' area of the Spanish Council for Scientific Research, as well as from
their curricula vitae. One quarter of the scientists work as members of teams in the process of consolidation. Our findings
illustrate the importance, for the development and consolidation of research teams, of the availability of a minimum number
of researchers with a permanent position and of a minimum number of support staff and non-staff personnel (mainly post-doctoral
fellows). Consolidation of research teams has a clear influence on the more academic-oriented quantitative indicators of the
scientific activity of individuals. Researchers belonging to consolidated teams perform quantitatively better than their colleagues
in terms of the number of articles published in journals covered in the Journal Citation Reports, but not in terms of the impact of these publications. Consolidation favours publication, but not patenting, and it also
has a positive effect on the academic prestige of scientists and on their capacity to train new researchers. It does not significantly
foster participation in funded R&D projects, nor does it influence the establishment of international collaborations. Impact
is influenced to a remarkable degree by seniority and professional background, and is significantly greater for young scientists
who have spent time abroad at prestigious research laboratories. 相似文献
18.
19.
The mechanism for hologram formation by fixation-free rehalogenating bleaching has been treated by several authors. Experiments carried out with Kodak and Agfa photographic plates have led to the conclusion that the transfer of material from the exposed to the unexposed zones is the main mechanism that drives the process. We show that when BB-640 emulsion is used in the recording of holograms by means of fixation-free rehalogenating bleaching, the mechanism for the transfer of material from exposed to unexposed zones is efficient enough to create high refractive-index modulations. We also comment on the overmodulation effects, which result in a decrease in diffraction efficiency. 相似文献
20.
José A. Sobrino Rosa Oltra-Carrió Guillem Sòria Juan Carlos Jiménez-Muñoz Belén Franch Victoria Hidalgo 《International journal of remote sensing》2013,34(9-10):3177-3192
The surface urban heat island (SUHI) effect is defined as the increased surface temperatures in urban areas in contrast to cooler surrounding rural areas. In this article, the evaluation of the SUHI effect in the city of Madrid (Spain) from thermal infrared (TIR) remote-sensing data is presented. The data were obtained from the framework of the Dual-use European Security IR Experiment (DESIREX) campaign that was carried out during June and July 2008 in Madrid. The campaign combined the collection of airborne hyperspectral and in situ measurements. Thirty spectral and spatial high-resolution images were acquired with the Airborne Hyperspectral Scanner (AHS) sensor in a 11, 21, and 4 h UTC scheme. The imagery was used to retrieve the SUHI effect by applying the temperature and emissivity separation (TES) algorithm. The results show a nocturnal SUHI effect with a highest value of 5 K. This maximum value agrees within 1 K with the highest value of the urban heat island (UHI) observed using air temperature data (AT). During the daytime, this situation is reversed and the city becomes a negative heat island. 相似文献