FOOD CHEMISTRY
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2014
·
IF 3.259
Meiling Wang,Yunqiao Gao,Qian Sun,Jianwei Zhao
In the present work, a novel strategy based on new carbon nanotube (CNT) and polypyrrole (ppy) composite modified electrode for the simultaneous determination of the isomers of Amaranth (E123) and Ponceau 4R (E124) was proposed. Due to the increasing dispersibility and effective surface area of the CNT caused by decoration of ppy to the CNT, the proposed electrode exhibited excellent electrochemical sensitivity and high selectivity toward the oxidation of Amaranth and Ponceau 4R. The linear response ranges for Amaranth and Ponceau 4R were 5.0 × 10 −9 M–5.0 × 10 −7 M, and 8 × 10 −9 M–1 × 10 −6 M and corresponding detection limits as low as 5.0 × 10 −10 M and 1.0 × 10 −9 M, respectively. This proposed method was successfully applied in the detection of Ponceau 4R and Amaranth in fruit drink samples.
研究领域:
分析化学
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食品科学
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DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Yunmei Huang,Jidong Yang,Jiawei Cheng,Yuhui Zhang,Haiyan Yuan
A convenient and sensitive spectrophotometric methods was proposed for determination of Malathion (Mala) using Erythrosin B (EryB) as a probe through the Resonance Rayleigh scattering (RRS) technique. The interaction between EryB, Pd 2+ and malathion in the system was investigated by fluorescence, RRS and UV–Vis spectroscopy. Under the optimum conditions, the RRS intensity of EryB, Pd 2+ and malathion was weak when exist in alone or any two kinds, however, the RRS intensity of the EryB-Pd 2+ -Mala system had an obvious enhancement due to Pd 2+ could interact with the hydrolysis products of Mala and EryB each other form a new complexes. At the same time, the fluorescence intensity of EryB was decreased significantly in the presence of Pd 2+ , and the fluorescence intensity of EryB-Pd 2+ system further decreased when Mala added, interestingly. So it was further proved that there was a forming complex in EryB-Pd 2+ -Mala system. Under the optimal conditions, the RRS enhanced intensity of the system was linearly proportional to the Mala's concentration in the range of 0.012–0.8 μg/mL, and the LOD was 1.7 ng/mL, with the correlation coefficient was R 2 = 0.9960. So, a new method for determination of Mala was established and this method has been demonstrated in real sample with satisfactory results.
研究领域:
分析化学
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环境科学
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PubMed
高影响因子
RSC Advances
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2017
·Vol. 7
·期 29
·17873-17881
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IF 3.108
Piyong Zhang,Ting Song,Tingting Wang,Heping Zeng
A broad spectrum absorption photocatalytic system has been expected for a long time, especially for catalysts where the absorption mainly concentrates on the ultraviolet region, like TiO2. Here, dye sensitization was used to realize this expectation for TiO2. Anatase TiO2 was prepared by a hydrothermal method and then modified with Cu nanoparticles (NPs) by chemical reduction reaction. The highest H2 production rate was 3.33 mmol g−1 h−1 for Cu(3%)–TiO2 (content of Cu NPs was 3 wt%) and for pure TiO2 was only 0.356 mmol g−1 h−1. Next, the Cu(3%)–TiO2 photocatalyst was sensitized with various amounts of Erythrosin B (ErB) and the highest H2 production rate was 13.4 mmol g−1 h−1 with 3 mg of ErB in the photoreaction system. Under monochromatic light irradiation (500, 550, 600 and 650 nm), no photocatalytic activity was detected for Cu(3%)–TiO2 and some photocatalytic activities were obtained for sensitized Cu(3%)–TiO2, indicating that ErB sensitization can extend the visible light harvesting ability efficiently. Through photoelectrochemical analysis, electron–hole separation and transfer processes were promoted significantly by modification with Cu NPs and then sensitization by ErB. A possible ErB sensitization mechanism is proposed between ErB and Cu–TiO2 for the improvement of the photocatalytic activity.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2021
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IF 7.46
Huasheng Lai,Gongke Li,Zhuomin Zhang
In this work, a native beta-cyclodextrin capped silver nanoparticles decorated Ti 3 C 2 T x nanosheets (Ti 3 C 2 T x -AgNPs@β-CD) surface-enhanced Raman scattering (SERS) substrate was developed by a facile one-pot method. The two-dimensional Ti 3 C 2 T x nanosheets not only acted as the supporter to load AgNPs, but also served as chemical enhancement material. Meanwhile, β-CD played a critical role in the control of morphology and size of AgNPs, and its supramolecular structure also endowed the Ti 3 C 2 T x -AgNPs@β-CD substrate with selectivity. The Ti 3 C 2 T x -AgNPs@β-CD substrate exhibited excellent sensitivity, good intra-batch and inter-batch reproducibility, and long-term stability by detecting methylene blue model molecule. Then, the substrate was applied for selective determination of erythrosin B among pigment additives via the host-guest size-matching effect. The proposed SERS method with linear range of 1−100 mg/L and detection limit of 30 μg/L could realize rapid SERS analysis of erythrosin B in dyed food samples within 15 min with recoveries of 78.1 %–113.2 %. Erythrosin B was actually found in dyed cherry with 49 mg/kg and marshmallow with 16 mg/kg, and the result matched well with that of UV–vis method. Such a robust substrate possessed great values for efficient and rapid on-site SERS analysis in food safety issues.
研究领域:
食品安全
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分析化学
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纳米材料科学
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DOI
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2025
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IF 8
Yaxin Yu,Fei Xia,Qi Cao,Hanyuan Zhang,Wanting Shi,Peng Zhang,Wenxiu Sun
The adoption of innovative active food packaging has become increasingly crucial for suppressing microbial proliferation and prolonging the shelf life of food items. In this research, we detail the development of novel photodynamic antimicrobial nanofiber films via the electrospinning method, employing polyvinyl alcohol (PVA) as the base material and erythrosine B (EB) as the photosensitizing agent. We examined the chemical composition, photophysical characteristics, and antibacterial properties of these films. FTIR spectroscopy validated the integration of EB within the nanofiber structures. Furthermore, EB enhanced the films' resistance to water, lowered water vapor permeability, and displayed moderate mechanical strength. The nanofiber films exhibited a remarkable capability for generating reactive oxygen species and showed significant antibacterial effectiveness against E. coli , S. aureus , P. putida , and P. aeruginosa , maintaining an overall migration limit of EB within the acceptable threshold of 10 mg/dm 2 . We utilized PVA/EB-G films along with tray packaging to preserve chilled horsemeat, assessing physicochemical alterations and microbial populations. The storage life of chilled horsemeat was prolonged by 6 days in comparison to controls that did not include PVA/EB-G films. The results of this investigation propose a novel strategy for harnessing photodynamic mechanisms in the preservation of chilled meat.
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PubMed
高影响因子
FIBERS AND POLYMERS
·
2017
·Vol. 18
·期 9
·1644-1651
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IF 1.113
Nan Xuying,Huang Yi,Fan Qinguo,Shao Jianzhong,Yao Yuhua
A series of erythrosine B derivatives with a linked coinitiator on different position, combined with iodonium salt and/or tertiary amine were used to initiate free radical/cationic photopolymerization. Their photoinitiating ability and photobleaching behaviors were investigated and compared with those of the systems containing separated counterparts. The polymerization results showed that compared to the systems containing separated counterparts, the systems containing derivatives with a linked coinitiator on carboxyl group exhibited higher photoinitiating ability in radical photopolymerization, but had poorer one in cationic polymerization. Simultaneously, in free radical/cationic polymerizations, these linked derivatives could be photobleached more efficiently than the separated one, due to fast intramolecular reaction, which was especially significant for the industrial application. Besides, it was found that the investigated systems were photobleached more efficiently in cationic photopolymerization than in radical one. These results will provide useful information for designing effective photoinitiators for different polymerization.
研究领域:
高分子科学
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光化学
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材料科学
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2015
·Vol. 133
·期 10
·
IF 1.768
Xuying Nan,Yi Huang,Qinguo Fan,Jianzhong Shao,Yuhua Yao
Three dye-linked photoinitiators with excellent spectral stability in an acid medium were synthesized by the covalent bonding of a coinitiator (tertiary amine) and a benzoyl group or two coinitiators to the phenolic and carboxyl group position of erythrosine B. The combination of the iodonium salt and free tertiary amino used to initiate the free-radical/cationic visible photopolymerization was investigated to acquire the relationship between the structure and performance. The photoinitiating ability of the derivative with the phenolic position bearing a coinitiator was poorer than of the derivative with the carboxyl group bearing one because of the strong back electron transfer of the former. For the derivative with a linked coinitiator on the carboxyl position, the proximity effect between the sensitizer and the coinitiator moiety resulted in an excellent photoinitiating ability for radical/cationic polymerization; this suggested its potential for application. Although radical/cationic photopolymerization could be initiated by the derivative/coinitiator/iodonium salt, the different component ratios between them had different effects on these two polymerizations; this provided useful information for the design of effective photoinitiators for different polymerizations. On the basis of the fluorescence quenching and photopolymerization results, a corresponding synergistic mechanism was proposed. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43035.
研究领域:
高分子科学
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材料化学
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光化学
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DOI
高影响因子
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