JOURNAL OF FLUORESCENCE
·
2025
·
IF 3.1
Zhang Hongmei,Yang Yunxia,Wang Yanqing
Sudan dyes are recognized as carcinogens, which are strictly determined whether there are them in food for food safety. Hence, in order to understand the mechanism at the molecular level, this work investigated the binding interactions of Sudan I-IV with calfthy mus DNA. The synchronous fluorescence and UV–vis spectral results suggested the complex formation between Sudan I-IV and ct-DNA. EB and Hoechst 33258 displacement experimental results confirmed the binding sites of Sudan I-IV in ct-DNA and the minor groove-binding mode of Sudan I-IV with ct-DNA. The molecular modeling computational method also proved binding mode, which is consistent with the spectral experiments. In addition, the aromatic rings of Sudan I-IV play important roles in binding with DNA. Compared to Sudan I and II, the increase of molecular conjugation system enhances the binding abilities of Sudan III and Sudan IV with DNA. Vdm + Hbond + desolv energies of them are the main contribution of their combined energies.
研究领域:
生物化学
·
食品安全
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2024
·Vol. 40
·期 2
·279-286
·
IF 3.1
Dou Renju,Wang Qin,Ren Xiaoyan,Lu Lehui
Here we employ in-situ UV-Vis spectroscopy to monitor the sulfur redox reaction with oxygen-containing molecules as an additive, for example, biphenyl-4,4′-dicarboxylic acid (BDC). Furthermore, Raman spectrum, electron paramagnetic resonance (EPR), and electrospray ionization-mass spectrometry (ESI-MS) measurements reveal that the formation of BDC-S
•‒ 3
complexes can establish the long-term stability of polysulfide radicals, change the kinetics of sulfur redox reaction, and then generate decent capacity retention and rate capability. According to the density functional theory (DFT) analysis, S
•‒ 3
radicals are the underlying product of S
2‒ 6
cleavage, owing to the decreased chemical energy and the increased stability of S
•‒ 3
radicals through Lewis acid-base interaction. The assembled Li-S batteries with BDC additive deliver a high reversible capacity of 420 mA·h·g −1 over 200 cycles with over 98% Coulombic efficiency, under the current density of 0.2 C.
研究领域:
材料科学
·
电化学
·
理论化学
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产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2016
·
IF 4.052
Shuang Zang,Sizhu Tian,Jia Jiang,Dandan Han,Xinyu Yu,Kun Wang,Dan Li,Dayong Lu,Aimin Yu,Ziwei Zhang
Twenty-one kinds of fruits including strawberry, mulberry, lemon, banana, etc. were measured for antioxidant capacity based on their ability to scavenge 1,1-diphenyl-2-picryl-hydrazyl (DPPH) radical. Vitamin C equivalent antioxidant capacity (VCEAC) was used to quantify antioxidant capacity of the studied fruits. The results were expressed as mg of ascorbic acid equivalent per 100 g fruit. Each fruit was divided into two parts: harvest part (fresh fruit analyzed immediately), and liquid nitrogen frozen part (fruit frozen and pulverized in liquid nitrogen). Antioxidant capacities of both fresh and frozen fruits were determined, and VCEAC values were proved to have no significant difference. For the frozen fruits, the antioxidant capacities were measured by electron spin resonance spectroscopy (ESR) and UV–vis spectrometry. VCEAC values obtained with UV–vis and ESR range from 11.48 to 345.75 mg/100 g and 7.01 to 366.26 mg/100 g. Experimental results indicated that VCEAC values obtained by two methods were highly correlated.
研究领域:
食品科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemCatChem
·
2023
·Vol. 15
·期 15
·e202300440
·
IF 4.5
Xiaoyue Zhang,Yong Yang,Lijun Xiong,Tianyu Wang,Mengwei Xue,Jianhua Ge,Zheng Tang,Panjie Li,Nan Yin,Jinyou Shen
Graphical Under light excitation , WOS broadens the photo-response range through Z-scheme heterojunction. Its photothermal effect can convert light into heat and accelerate the reaction. This efficient photothermal technology facilitates CO 2 reduction. Photothermal CO 2 reduction using H 2 O combined with photocatalysis-driven H 2 O splitting combined with thermal catalysis-supported CO 2 reduction has attracted rapid interest in artificial synthesis of solar fuel. With respect to extremely efficient photothermal catalysis, the photothermal impact of TMDCs (Transition Metal Dichalcogenides) facilitates CO 2 reduction by activating lattice oxygen in oxide to enhance H 2 O oxidation. However, the fixed band gap of single photocatalyst is limited. The purpose of this work is to expand the band gap and improve the redox capacity. Hollow boxwood ball-like WO 3 /WS 2 Z-scheme heterojunctions were prepared and used for photothermal catalytic CO 2 reduction. DFT calculations and UV-Vis spectra show LSPR effect in WOS heterojunctions, and the optical response extends to near infrared region. By comparison, the photothermal catalytic reduction of WO 3 /WS 2 (9.717 μmol) by CO 2 at 513 K is higher than that at 298 K (1.198 μmol) by a factor of 8. The formation of Z-scheme heterojunction promotes rapid carrier transfer and lowers the reaction energy barrier. As well as the hollow structure improves light utilization and increases the interfacial area and number of active sites. In addition, the WO 3 /WS 2 heterostructure utilizes its unique LSPR effect to generate heat through the photothermal effect, which can also promote molecular activation. This work reveals the important role of the LSPR effect in photothermal catalysis and demonstrates a TMDCs-based photothermal-driven catalysts, which presents a promising approach for designing of photothermal catalytic CO 2 reduction.
研究领域:
催化
·
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nano Research
·
2022
·
IF 1.78
Rusul Mohammed Abdallah,Raad M.S. Al-Haddad
There are many methods for synthesizing magnetite nanoparticles. Most methods take a long time, and the result is undesirable. In this paper a green method was used to synthesize nanoparticles because it takes a short time and is both straightforward and eco-friendly. It is done by adding : =1:2 molar ratio solution with different amounts of extract and different amounts of NaOH solution for 20 min at different temperatures, in hotplate stirrers, to control their relative size. UV-Vis spectroscopy, vibrating sample magnetometer technique (VSM), transmission electron microscopy (TEM), and X-ray diffraction (XRD) were used to characterize the magnetite nanoparticles. The result confirms that the changes in amounts of NaOH and extract led to a change in the pH of a solution and that the increase in amounts of the extract caused the low addition of NaOH. These changes influenced the process of synthesis and characterization. The Uv-vis analysis confirms that the surface plasmon resonance had a highly visible brad peak in the 290–460 nm range, as well as a peak shift to shorter wavelengths (blue shift) with a pH change and a peak shift to longer wavelengths (red shift) with a temperature change. TEM imaging confirms that all the synthesized had a spherical shape with size changed according to a parameter change of within 40–9 nm. Magnetic analysis showed the magnetite nanoparticles synthesized have smaller sizes and are superparamagnetic with the influence of particle size on the magnetic properties, including Hc, Ms, and Mr.
研究领域:
材料科学
·
纳米技术
·
化学
·
物理学
✓ 已验证
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2022
·
IF 11.504
Kefan Ouyang,Hexiang Xie,Yufeng Wang,Meng Wai Woo,Qian Chen,Sixing Lai,Hua Xiong,Qiang Zhao
In this study, phosphoric acid was used to replace hydrochloric acid which is widely reported in the production of whey protein isolate fibrils (WPF). The pH, temperature, and protein concentration for the phosphoric acid-induced fibrillation were optimized (4% w/v, pH 2.5, 90 °C). Under this condition, the mean particle size and molecular weight decreased significantly while the ζ-potential increased slightly, it suggested that the fibrillation was accompanied by hydrolysis . WPF was already formed via intermolecular interactions at 6 h, which exhibited a semiflexible and unbranched filament of about 10 nm in diameter. A few single-filament flexible fibrils (about 5 nm in diameter) formed at 24 h. Thioflavin T analysis supported by Intrinsic fluorescence showed that the use of phosphoric acid accelerated the fibrillation. The ANS fluorescence and Second-derivative UV–vis spectra indicated the increase in surface hydrophobicity, peaking after 12 h of heating. Compared with the hydrochloric acid induced, WPF induced by phosphoric acid exhibited a shorter lag phase and maintained a more stable dispersion state with a nanoscale particle size. The great interfacial properties and proper aspect ratio (length/diameter) provided the contribution that WPF effectively absorbed at the oil-water interface. Moreover, the emulsion stability of the WPF improved with increasing salt concentration. The phosphoric acid-induced WPF had the best emulsion stability at pH 5.5 which was further enhanced by proper heating.
研究领域:
食品科学
·
蛋白质化学
·
胶体科学
·
乳液技术
✓ 已验证
DOI
高影响因子
OPTICS EXPRESS
·
2020
·Vol. 28
·期 8
·10714-10724
·
IF 3.669
Bin Liu,Bin Liu,Jinkai Li,Jinkai Li,Jinkai Li,Guangbin Duan,Min Ji,Yizhong Lu,Tao Yan,Bingqiang Cao,Zongming Liu,Zongming Liu
Organic-inorganic hybrid perovskite nanocrystals have been widely studied for their excellent photoelectric properties. However, the irregular morphologies of organic-inorganic hybrid perovskite nanocrystals have limited application in the field of lighting and display. From this, the regular morphologies of nanospheres, nanorods, nanoplatelets and MAPbBr3 (MA = CH3NH3+) nanocrystals have been synthesized by regulating the type and proportion of auxiliary ligands. The phase evolution, morphology and fluorescent properties were systematically studied by the various instruments of XRD, TEM, PL/UV-vis spectroscopy and fluorescence decay analysis. With the morphologies changing from nanospheres to nanoplatelets, the emission peaks of MAPbBr3 nanocrystals red-shifted, and the lifetimes have increased gradually. The underlying mechanisms were thoroughly investigated and elucidated. On this basis, the role of acid and amine in the synthesis of MAPbBr3 nanocrystals was systematically studied by regulating the ratio of oleic acid and N-octylamine. The fluorescence kinetics of MAPbBr3 nanocrystals were studied by femtosecond transient absorption spectroscopy, and the charge carrier relaxation mechanism was clarified. Furthermore, the effect of temperature on the fluorescence properties of the nanocrystal was investigated in detail. Organic-inorganic hybrid perovskite nanocrystals with morphologies-controlled and excellent fluorescence properties are expected to be widely used in lighting and display fields.
研究领域:
材料科学
·
光电技术
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）