JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2025
·
IF 4.6
Min Sun,Xujie Wang,Lingwei Bu,Yawen Fan,Zihan Guo,Yingying Shan,Xiao Zhu,Lei Hu,Zhengquan Yan
Herein, a novel Bi 3+ -doped Au-Ag quantum dot (Bi 3+ -Au-Ag QD) system was synthesized, by homogeneous reduction method using AgNO 3 , Bi(NO 3 ) 3 ·5 H 2 O and HAuCl 4 ·4 H 2 O as raw materials, for multi-channel detection of S 2− in agricultural foods. Owing to the strong interaction between S 2− and the Ag/Au components, trace amounts of S 2− led to the formation of Ag 2 S or Au 2 S sulphides on the surface of the Bi 3+ -Au-Ag QDs. This surface modification altered the intrinsic fluorescence property of QDs, and their catalytic ability to the oxidization of colourless 3,3′,5,5′-tetramethylbenzidine (TMB) into its blue oxide (oxTMB), resulting in noticeable changes in spectral responses, colour and RGB values. Under optimised experimental conditions, Bi 3+ -Au-Ag QDs were employed successfully for ‘turn-on’ fluorescence, UV–vis and smartphone-assisted red-green-blue (RGB) detection of S 2− in real agricultural food samples. The limits of detection –4.75 × 10 −10 , 6.48 × 10 −9 and 7.22 × 10 −9 mol·L −1 respectively, well met the safety threshold set by the World Health Organization.
研究领域:
分析化学
·
纳米技术
·
食品安全
·
环境监测
·
光学传感
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2024
·Vol. 26
·期 5
·1-14
·
IF 2.1
Liu Zhe-Nan,Liu Lv-Cheng,Xue Jin-Peng,Li Shi-Gang,Li Xing
In this work, we employed L-methionine (L-M) as the functionalized reagent of AuNPs for the colorimetric and UV–vis dual-mode detection of As 3+ , Cd 2+ , and Hg 2+ ions with excellent selectivity and anti-interference. After adding the target ions, the functionalized AuNPs can be cross-linked together due to the As 3+ /Cd 2+ /Hg 2+ ions reacting with amino N, carbonyl or hydroxyl O of L-methionine to form the coordination bonds, resulting in the aggregation of functionalized AuNPs and cause the different red-shifts of the SPR absorption peak and color changes of functionalized AuNPs solutions. The LODs of the colorimetric sensor are 10 ppb/13 ppb/4 ppb by naked eyes and 2.35 ppb/1.68 ppb/0.32 ppb by UV–vis spectroscopy with good linear relationships between the absorbance ratios (A 633nm /A 519nm , A 645nm /A 519nm and A 665nm /A 519nm ) and As 3+ , Cd 2+ and Hg 2+ concentrations, which can be successfully applied to sense and detect As 3+ /Cd 2+ /Hg 2+ pollutants in tap water, pond water, well water, and other domestic water sources. Graphical Abstract
研究领域:
分析化学
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Fei Cheng,Taiming Zhang,Chunhua Yang,Hongqiu Zhu,Yonggang Li,Tao Sun,Can Zhou
To determine the total iron concentration in aqueous solutions containing complexing matrix, a direct and rapid ultraviolet–visible spectroscopy determination method was developed using the Nitroso R salt as a chromogenic reagent. In the presence of NaI and CTMAB, the experiment shows that Nitroso R salt-Fe complex can produce a significantly sensitive and selective absorbance peak at 710 nm with no notable time for sensing. The experimental factors that affect the procedure such as temperature, acidity and dosages of various reagents were analyzed and optimized. Under the optimized experimental conditions, the limit of detection and limit of quantification of the method was 4.5 × 10 −8 and 1.5 × 10 −7 mol/L. The calibration curve was obtained in a wide linear range of 1.5 × 10 −7 -6.4 × 10 −5 mol/L with good linearity (R 2 = 0.9989). The method was free of any interference with common ions and can determine the iron content in the complex matrix of aqueous samples. The methodology was further validated by the certified reference water samples used for environmental monitoring and agreed with the ICP-OES spectrophotometry results. Compared with the conventional method, the relative standard deviations of the spike test in various actual samples were in the range of 0.31%-2.9% ( n = 5). Good recoveries between 96.4% and 107% were obtained. The proposed method provides great promise for application in-field analysis of iron content in various environmental samples and hydrometallurgical solutions owing to its high sensitivity, low cost, good reproducibility, and no need for any complex pretreatment.
研究领域:
分析化学
·
环境科学
·
冶金工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 43
·24346-24354
·
IF 2.936
Ruru Li,Xiaoyu Huang,Guolin Lu,Chun Feng
Biological thiols with similar structures, such as glutathione (GSH), N-acetyl-L-cysteine (NAC), homocysteine (Hcy) and cysteine (Cys), play important roles in human physiology and are associated with different diseases. Thus, the discrimination of these thiols is a great necessity for various biochemical investigations and the diagnosis of related diseases. Herein, we present a new dual-signaling probe consisting of a typical aggregation induced emission fluorogen of a tetraphenylethylene group and 2,4-dinitrobenzenesulfonyl moiety. The probe can be used to selectively and quantitatively detect Cys over a variety of bio-species, including GSH, NAC and Hcy, from both UV/vis absorption and fluorescence channels. The mechanism study showed that the fluorescence and UV/vis absorption were turned on as the probe undergoes displacement of the 2,4-dinitrobenzenesulfonyl group with Cys, where the UV/vis and fluorescence signals originate from the dinitrophenyl-containing compounds and aggregates of TPE-OH, respectively. In addition, the discrimination of Cys was achieved by more rapid intramolecular displacement of sulfur with the amino group of Cys than NAC, Hcy and GSH. Moreover, the probe shows ignorable cytotoxicity against HepG2 cells, which demonstrates the great potential of the probe in selectively detecting Cys in vivo.
研究领域:
分析化学
·
生物医学
·
化学生物学
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Jinqing Chen,Wenqi Xie,Xiangguang Guo,Bin Huang,Yu Xiao,Xiaoqi Sun
In this paper, a series of high performance near-infrared reflective pigments based on Bi 3 YO 6 doped with Fe 2 O 3 and Tb 4 O 7 were prepared by high-temperature calcination method. The pigments were characterized by some analytic techniques, such as XRD , Particle size analyzer, SEM, EDS , UV–vis–NIR spectrophotometer, CIE L*a*b* (1976) color space and infrared thermal imaging. Experimental results showed that the Fe 2 O 3 doping in Bi 3 YO 6 could change the color from bright yellow to ochre red. The substitution of Tb (IV)-doped pigments changed the color to dark orange. The doping of Fe (III) and Tb (IV) contributed to enriching the color diversities of pigments. Among the synthesized pigments, Bi 3-x Fe x YO 6 and Bi 3 Y 1-x Tb x O 6+δ displayed a disordered defective fluorite-type structure. The effect of doping Fe (III) and Tb (IV) reduced the near-infrared reflectance of the pigment. Excepting for Bi 3-x Fe x YO 6 (x = 0.8), the near infrared reflectance of some other pigments were higher than the China National standard (CNs). Chemical resistance tests showed that the pigments had excellent acid and alkali resistance. Finally, the application practical of traditional iron oxide yellow pigment and three prepared pigments, i.e., Bi 3 YO 6 , Bi 3-x Fe x YO 6 (x = 0.4) and Bi 3 Y 1-x Tb x O 6+δ (x = 0.05) were studied and compared by infrared thermal imaging. The test results showed that Bi 3 YO 6 still had a strong near-infrared reflection effect after being painted. Compared with traditional iron yellow pigment, Bi 3 YO 6 could reduce the surface temperature of galvanized sheet by 20 °C under the illumination of infrared light. The series of Fe (III) and Tb (IV) doped pigments prepared in this paper have revealed some promising application values.
研究领域:
材料科学
·
化学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2016
·
IF 3.138
Ting Hu,Qilin Huang,Kahing Wong,Hong Yang
Four polysaccharide fractions, LRP-1, LRP-2, LRP-3 and LRP-4 were extracted stepwise from Lignosus rhinocerotis sclerotia with distilled water at 25, 95, 120 °C and 1.0 M NaOH solution at 4 °C. Their structure, molecular size and chain conformation were clarified using SEC-MALLS-RI, GC, FT-IR and UV–vis. Furthermore, their immunomodulatory activities were evaluated by the model of cyclophosphamide (Cy)-induced immunosuppression. The LRP-1 and LRP-2 were polysaccharide-protein complexes (46–68% β- d -glucan and 27–48% protein), while LRP-3 and LRP-4 were absolutely composed of β- d -glucose. The LRP-4 with low polydispersity had much higher molecular weight ( M w , 5.86 × 10 6 g/mol) and intrinsic viscosity ([ η ], 202.6 ml/g) than other LRP fractions. Based on M w , radius of gyration ( z 1/2 ) and [ η ] data with the exponent β of z 1/2 –M w and its U-shaped curve, all four LRP fractions were highly branched macromolecules and LRP-3 showed a more compact sphere-like conformation than LRP-2 in aqueous solution. Additionally, all four LRP fractions exhibited protective effects against Cy-induced immunosuppression in mice by improving immune organs as well as stimulating the release of major cytokines TNF-α and INF-γ. This work provides a theoretical basis for the application of polysaccharides and their protein complexes from Lignosus rhinocerotis sclerotia in food- or drug-based therapies.
研究领域:
药理学
·
免疫学
·
生物化学
·
真菌学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Ruihui Wu,Ronghao Liu,Xiaoxia Liu,Jianwei Zhang,Wenfeng Xue,Yanzhao Yang
The recovery of Nd(III) from NdFeB permanent magnets is gaining increasing attention. In the rare earth elements separation industry, wastewater produced through saponification has become a serious environmental problem. In this work, a novel non-saponification P350-N235 synergistic extraction system was established for the extraction of Nd(III) from nitric acid medium. Almost 100% of Nd(III) was extracted by using a P350-N235 system when the molar fraction (X) of P350 was 0.3. And the synergistic enhancement factor R max reached 60.03. Firstly, the effects of time, pH, volume ratio and other variables were investigated to determine the extraction behaviors. Response surface methodology (RSM) was used to optimize the extraction conditions. The mechanism of synergistic extraction was investigated by FT-IR, UV–vis, NMR methods and ESP maps, indicating that the composition of the extracted complex was Nd(NO 3 ) 3 ·(P350) 2.5 (N235) 2.5 . Then, the extraction thermodynamics and kinetics were also thoroughly investigated, the extraction process is demonstrated to be a spontaneously exothermic reaction. In the NdFeB leaching solution, the synergistic system showed excellent separation factor (β) for Nd/Sm (1.43), Nd/Gd (7.33), and Nd/Dy (9.81). Finally, after 5 cycles, the P350-N235 synergistic system maintained high extraction efficiency. In conclusion, this study overcame the saponification problem in traditional extraction techniques and proposed an environmentally friendly green extraction system.
研究领域:
环境科学
·
化学工程
·
材料科学
·
稀土元素分离
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Chunyan Zhang,Zhendong Fu,Feng Hong,Ge Pang,Tengri Dong,Yunxiao Zhang,Guixia Liu,Xiangting Dong,Jinxian Wang
Broad spectrum response photocatalyst is crucial for making full use of sunlight and widely used in efficient photocatalytic degradation of organic dyes. In this work, upconversion luminescence boosted broadband photocatalysts based on BiF 3 :Yb 3+ , Er 3+ nanoparticles (BFY) and the carbon nitride doped with various masses of barbituric acid (CNB x ) semiconductor materials (BFY/CNB x ) were successfully designed and produced for photocatalysis in UV–Vis–NIR region. Compared with pure g-C 3 N 4 , BFY/CNB 0.5 composites have better photocatalytic performance attributed to the utilization of broadband spectrum energy and effective charge separation. After 30 min illumination by visible light , photodegradation efficiency of RhB reaches about 99.4% by using BFY-2/CNB 0.5 . A plot of C/C 0 versus time indicates that the BFY-2/CNB 0.5 can degrade about 64.7% of RhB in 80 min by NIR irradiation. Under simulated solar light, the sample of BFY-2/CNB 0.5 reaches a maximum degradation efficiency of 98.0% within 15 min. The strengthened photocatalytic activity is due to the synergistic effect of CNB 0.5 and upconversion materials. The active species utilized in the degradation process were examined using capture experiments. After four continuous photocatalytic cycles, about 94.0% of RhB solution is degraded. The photocatalytic mechanism of the composite photocatalysts is also analyzed in detail. The results indicate that the prepared BFY/CNB 0.5 photocatalysts have good prospects in the field of environmental remediation.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jinyuan Zhang,Tian Shi,Tong Liu,Fuhua Gao,Da Cai,Pingwei Liu,Shenghong Yang,Yueli zhang
Combining upconversion materials with narrow-wide bandgap semiconductors to construct heterostructured composite photocatalysts effectively improves solar energy conversion efficiency. NYF:Ln 3+ (Ln = Yb,Er,Tm)@BiOX(X = Cl,Br,I) heterostructures were prepared by a two-step hydrothermal method. This work explores the effects of different lanthanide ion doping and narrow-wide bandgap bismuth oxyhalides on the performance of the heterostructures system. Under near-infrared (NIR) light irradiation, NYF:Yb,Er,Tm@BiOI degraded 94 % BPA within 160 min. Significantly, compared with NYF:Yb,Er@BiOCl, NYF:Yb,Er@BiOBr and the NYF:Yb,Er,Tm/BiOI mechanical mixtures, the photocatalytic activity of NYF:Yb,Er,Tm@BiOI was increased by 9.4 times, 3.7 times and 1.8 times, respectively. The enhanced photocatalytic activity is attributed to the doping of Er-Tm double-activated ions, which provides multiple upconversion emissions and forms more overlap in the narrow bandgap BiOI absorption spectrum, making it advantageous to utilize upconversion light fully. Eventually, an underlying mechanism was proposed that the existence of FRET in the NYF:Yb,Er,Tm@BiOI heterostructure leads to enhanced photocatalytic activity. This work provides new insights into the design of advanced structures for NIR-responsive photocatalysts.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Yanting Chen,Mingxia Wang,Feng Yan,Wei Wang,Yuning Qu,Hongbo Fang,Zhenyu Cui,Benqiao He,Jianxin Li
In order to produce hydrogen fuel in green and environmentally friendly method, a series of novel metal-5,10,15,20- meso -tetra(p-hydroxypheny) porphyrin (MTHPP, M = Cu, Zn and Ni) mono-dispersedly functionalized MTHPP-sg-PSf/TiO 2 mixed matrix membranes (MP 12 -M 3 MMMs) were prepared via the in-situ surface grafting. UV–Vis induced hydrogen evolution from water shows an increasing order of NiP 12 -M 3 < P 12 -M 3 < ZnP 12 -M 3 < CuP 12 -M 3 , and the hydrogen production by CuP 12 -M 3 was up to 70.63 mmol/m 2 , which is 7.25 times higher than that of control membrane without metal ion (P 12 -M 3 ). The apparent quantum yield (AQY) at λ = 420 nm of CuP 12 -M 3 was 31.7 %, which are better than most reported photocatalysts. Furthermore, the hydrogen evolution performance of the MP 12 -M 3 MMMs are higher than that of equivalent MTHPP-TiO 2 powder, indicating that the porous membrane can immobilize porphyrin and TiO 2 monodispersely to improve its catalytic performance significantly. Finally, the photocatalytic mechanism of the MP 12 -M 3 MMMs was explored by electrons transfer rate constant (k ET ), excited state oxidation potential (E OX(dye*) ), electron spin resonance (ESR) and density functional theory (DFT). This work details the construction a photocatalytic membrane by novel surface modification method, which can be used for long-term photolysis of water to produce hydrogen and provide an effective strategy for improving hydrogen production performance.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Yuefa Jia,Shiping Li,Haoxuan Ma,Jianzhi Gao,Gangqiang Zhu,Fuchun Zhang,Jun Young Park,Sangwon Cha,Jong-Seong Bae,Chunli Liu
To fully utilize the solar light, photocatalyst with broad spectrum response from UV to near-infrared (NIR) is desirable. In this work, ternary mixed valent Bi 2 O 4 -Bi 4 O 7 -BiO 2-x with rich oxygen vacancy has been synthesized through one-pot hydrothermal treatment of NaBiO 3 . The results showed that through adjusting the hydrothermal conditions, oxygen vacancy-rich Bi 2 O 4 -Bi 4 O 7 -BiO 2-x nanocomposites with much higher efficiency than single or mixed bismuth oxides (Bi 2 O 4 , Bi 4 O 7 , BiO 2-x and Bi 4 O 7 -BiO 2-x ,) can be synthesized for photocatalytic degradation of bisphenol A (BPA) under UV, visible, and NIR light irradiation. In addition, the liquid chromatography-mass spectrometer (LC–MS) characterization demonstrated that BPA was oxidized to 4-isopropenyphenol first and the rings were opened sequentially under NIR light irradiation. Further detection of reactive species indicated that holes, O 2 − , and OH were the main oxidizing species in the degradation system. The experimental observations and density functional theory (DFT) calculations suggested that both type-II and the Z-scheme charge transfer with oxygen vacancies as electrons and holes mediators were formed at the interfaces of Bi 2 O 4 , Bi 4 O 7 , and BiO 2-x , resulting in a very efficient separation of photogenerated charge carriers in the composite. This work adds to the growing potential of mixed valent bismuth oxides based photocatalysts and is expected to accelerate the pace of the development of new-generation photocatalysts with high efficiency utilizing full-spectrum solar light.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Life
·
2015
·
IF 0
Qiong Yi,Ling Li,Wei Hong,Lu Fan
A composite of chromium (III) terephthalate metal-organic framework and graphene oxide (MIL-101/GO) coated stir bar was prepared by sol–gel technique for the first time and was employed for stir bar sorptive extraction (SBSE) of trace azo dyes amaranth, sunset yellow and carmine from water samples followed by UV–Vis spectrophotometric detection. A MIL-101/GO coating was first created on the glass bar surface. MIL-101/GO and MIL-101/GO coated stir bars were characterized. The enrichment factors of azo dyes by SBSE have been investigated in detail, and the optimized experimental parameters were obtained. Under the optimal conditions, a method for determination of trace amount of azo dyes was setup, and the detection limits of amaranth, sunset yellow and carmine were 2.3 ng/mL, 1.7 ng/mL and 1.6 ng/mL. The proposed method was successfully applied for the analysis of the three azo dyes in water samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
危险品化学品经营许可证（带存储）