SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2021
·
IF 4.098
Zichen Yang,Chaoqun Ma,Jiao Gu,Yamin Wu,Chun Zhu,Lei Li,Hui Gao,Wenzhi Yin,Zirui Wang,Ye Zhang,Yunpeng Shang,Chengwei Wang,Guoqing Chen
Benzoic acid, which has a pivotal role in food additive, is prohibited to add as a preservative in dairy products. China, Brazil, and other countries have proposed standard methods to detect the addition of benzoic acid in food. Surface-enhanced Raman scattering (SERS) is an upcoming spectral detection technique, which has been widely used in the field of material analysis with the advantages of non-invasive, fast detection speed and complex environment with little interference. To detect the illegal use of benzoic acid in dairy industry, we developed Ag-COF (covalent-organic framework) material as SERS substrate to detect benzoic acid in liquid milk. The great enhancement ability of Ag-COF substrate is controlled by the addition of acetic acid and complex interplay between COF material and benzoic acid. This detection method has high sensitivity and reliability that allows us to achieve limit of detection (LOD) of 0.13 μg/mL in milk and 0.00372 μg/mL in water by applying this method. In experiment on recovery rate of real samples, the detection time is less than 15 minutes and the relative standard deviation (RSD) ranged from 2.82% to 5.69%. Therefore, this method has practical significance of the detection of benzoic acid in dairy products.
研究领域:
食品科学
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分析化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2017
·
IF 4.9
Hao Li,Yanbei Cao,Di Zhang,Bo Pan
The dominant adsorption mechanism of ionizable organic chemicals (IOCs) on carbonaceous materials is still unclear. This study used benzoic acid (BA), o -chlorobenzoic acid (2-CBA) and p -chlorobenzoic acid (4-CBA) as representatives of IOCs to investigate the dominant adsorption mechanism on graphene oxide (GO) and graphite (GP), with a specific emphasis on the impact of pH-dependent K OW . The order of apparent adsorption of the investigated chemicals changed with pH, which could not be explained by their constant K OW . According to our measurement, K OW varied greatly with pH. The pH-dependent adsorption of BA, 2-CBA and 4-CBA were significantly correlated with pH-dependent K OW for both GO and GP. Our observations indicated that the hydrophobic effects may dominate the apparent adsorption of BA, 2-CBA and 4-CBA on GO and GP. Electrostatic repulsion played a minor role in their reduced adsorption at high pH. Negative charge-assisted H-bond and π-π interactions may explain the adsorption of negatively charged BA, 2-CBA and 4-CBA on negatively charged GO. This study implied that pH-dependent K OW rather than constant K OW should be incorporated to understand IOC adsorption as affected by pH.
研究领域:
环境科学
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化学
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产品关联
DOI
PubMed
高影响因子
PLoS One
·
2015
·Vol. 10
·期 4
·e0122740
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IF 3.234
Jinxing Hu,Mingrong Qian,Qian Zhang,Jinglan Cui,Chunna Yu,Xiaomei Su,Chaofeng Shen,Muhammad Z. Hashmi,Jiyan Shi
Biphenyl and polychlorinated biphenyls (PCBs) are typical environmental pollutants. However, these pollutants are hard to be totally mineralized by environmental microorganisms. One reason for this is the accumulation of dead-end intermediates during biphenyl and PCBs biodegradation, especially benzoate and chlorobenzoates (CBAs). Until now, only a few microorganisms have been reported to have the ability to completely mineralize biphenyl and PCBs. In this research, a novel bacterium HC3, which could degrade biphenyl and PCBs without dead-end intermediates accumulation, was isolated from PCBs-contaminated soil and identified as Sphingobium fuliginis . Benzoate and 3-chlorobenzoate (3-CBA) transformed from biphenyl and 3-chlorobiphenyl (3-CB) could be rapidly degraded by HC3. This strain has strong degradation ability of biphenyl, lower chlorinated (mono-, di- and tri-) PCBs as well as mono-CBAs, and the biphenyl/PCBs catabolic genes of HC3 are cloned on its plasmid. It could degrade 80.7% of 100 mg L −1 biphenyl within 24 h and its biphenyl degradation ability could be enhanced by adding readily available carbon sources such as tryptone and yeast extract. As far as we know, HC3 is the first reported that can degrade biphenyl and 3-CB without accumulation of benzoate and 3-CBA in the genus Sphingobium , which indicates the bacterium has the potential to totally mineralize biphenyl/PCBs and might be a good candidate for restoring biphenyl/PCBs-polluted environments.
研究领域:
环境微生物学
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污染治理
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Qianhui Mao,Qi Li,Huimin Li,Shoujun Yuan,Jibiao Zhang
This study investigated the reactivity and mechanism of paraben oxidization by chlorine dioxide. Degradation kinetics of methylparaben (MeP) and propylparaben (PrP) followed pseudo-first-order kinetics, and were studied in a pH range of 4.0–7.0 at 15 ± 1 °C. The k app values were 84.3 M −1 ·s −1 and 83.2 M −1 ·s −1 for MeP and PrP, respectively, when pH value was 5.0 and the temperature was 15 ± 1 °C. The rate constants depended on the solution pH, temperature, humic acid, and HCO 3 – concentrations. At pH values of 4–5.0, k app increased slowly, while at a pH value of 7.0, k app increased rapidly. The reaction rate constants increased with increasing temperature. Furthermore, the reaction rate was inhibited by humic acid addition, while the reaction rate increased after addition of HCO 3 – . Two main degradation products were identified by GC–MS and the reaction pathways were proposed.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
Arabian Journal of Chemistry
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2017
·
IF 4.553
Waqar Uddin,Gang Hu,Xuanxuan Sun,Hui Zhang,Yegui Wang,Lin Hu
A novel method for identification of two aromatic isomers of mono hydroxy benzoic acid (HBA) was reported by using their different perturbation effects on the potential oscillations of a Belousov-Zhabotinsky (BZ) system. In such a system, a macrocyclic complex of Cu [CuL](ClO 4 ) 2 was used as catalyst in which ligand L is 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene. To the BZ system, 3-hydroxy benzoic acid (3-HBA) could temporarily quench and regenerate potential oscillations with damping characters after inhibition time (t in ) while 4-hydroxy benzoic acid (4-HBA) could only change the oscillation amplitude (ΔA) to give damping oscillations with no inhibition time. Thus, these two isomers of HBA were identified. Reaction mechanisms of BZ have been proposed by FKN model. An explanation of perturbation mechanism is that, although 3-HBA reacted with BrO 2 while 4-HBA reacted with BrO 3 − , they all produced 1,4-quinone.
研究领域:
化学
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分析化学
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2014
·Vol. 16
·期 33
·7667-7672
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IF 3.858
Tingting Zhang,Yan Yang,Xiaojun Zhao,Jiangtao Jia,Hongmin Su,Hongming He,Jingkai Gu,Guangshan Zhu
The pharmaceutical cocrystal approach can be used to modify the properties of paliperidone. We report here two novel cocrystals, paliperidone 4-hydroxybenzoic acid cocrystal (1, 1 : 1, w/w) and paliperidone 4-aminobenzoic acid cocrystal (2, 1 : 1, w/w), with CCDC numbers of 855981 and 948923, which were constructed using paliperidone with 4-hydroxybenzoic acid and 4-aminobenzoic acid, respectively. The experimental results of the dissolution studies revealed that both 1 and 2 showed much faster dissolution rates than the original active pharmaceutical ingredient (API) in simulated gastric fluid media (pH = 1.2). The pharmacokinetic (PK) studies of 1, 2 and the original API were conducted using beagle dogs. 1 has a slightly higher maximal serum concentration, and both of the cocrystals presented considerably faster absorption rates after a single-dose oral administration to beagle dogs compared to the original API. Observed improvements suggested their potential application to the treatment of acute schizophrenia.
研究领域:
药剂学
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药物化学
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生物医学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2022
·
IF 7.968
Kai He,Shuchen Wang,Yu Liu,Dong Cheng,Feng He
Under oxic environment, the corrosion of zero valent iron (ZVI) connects with its oxidation and adsorption capacity, but little is known about the effects of sulfidation on those processes of ZVI. To assess the oxidant production from ball-milling unsulfidated and sulfidated microscale ZVI (mZVI bm and S-mZVI bm ), the transformation of benzoic acid (BA) to p-hydroxybenzoic acid (p-HBA) was used as the oxidation probe reaction. During the oxidation reaction, the concentration of p-HBA in S-mZVI bm /O 2 systems rapidly reached equilibrium (< 12 μM) within 40 min regardless of sulfur loading content, whereas it could gradually reach 26 μM in mZVI bm /O 2 system within 240 min despite the slower generation of p-HBA at initial stage. Combining with the characteristic analysis, the lower oxidation capacity of S-mZVI bm /O 2 system might be ascribed to the enhanced Fe(II) dissolution that caused a larger solution pH rise along with the loss of Fe(0) and FeS x sites and the formation of lepidocrocite , which was not beneficial for oxygen activation. Under the identical conditions such as material dosage and co-existing anions, the oxidation capacity of mZVI bm /O 2 system also exceeded S-mZVI bm /O 2 system. In addition, the comparative experiment of Zn 2+ immobilization by S-mZVI bm and S-mZVI bm with or without BA was investigated. mZVI bm showed insignificant Zn 2+ immobilization, whereas BA could enhance Zn 2+ immobilization by S-mZVI bm due to the enhanced corrosion that could provide more adsorption sites. Overall, this work is valuable for assessing the oxidation capacity of S-mZVI bm /O 2 system and BA effect on heavy metal immobilization of S-mZVI in wastewater treatment .
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
Catalysts
·
2023
·Vol. 13
·期 6
·971
·
IF 3.9
Chunjie Shi,Xiaofeng Yu,Wei Wang,Haibing Wu,Ai Zhang,Shengjin Liu
The catalytic activity and cyclic catalysis of different methyl benzoates were studied by using a series of Lewis solid acid catalysts. The iron-supported zirconium/titanium solid acid catalysts were characterized using FTIR, SEM, XRD, and BET. The details of catalytic activity and cyclic catalysis verified that the catalyst catalyzed the reactions of 31 benzoic acids with different substituents and methanol. In addition, the mechanism was revealed according to the microstructure, acid strength, and specific surface area of the catalysts, and the yields of methyl benzoates by the GC-MS. Zr ions had significant effects on the catalytic activity of the catalyst. A certain proportion of Fe and Ti ions additionally enhanced the catalytic activity of the catalyst, with the catalyst-specific composition of Fe:Zr:Ti = 2:1:1 showing optimal catalytic activity. A variety of substituents in the benzene ring, such as the electron-withdrawing group, the electron-donating group, large steric hindrance, and the position of the group on the benzene ring, had regular effects on the catalytic activity of the methyl benzoates. An increase in the catalyst activity occurred owing to the increases in the catalyst surface and the number of acid sites after the Fe ion was added. The catalytic activity remained unchanged after the facile recycling method was performed.Keywords:zirconium/titanium solid acid;iron-supported;methyl benzoate compounds
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
EUROPEAN JOURNAL OF LIPID SCIENCE AND TECHNOLOGY
·
2019
·Vol. 121
·期 11
·1900210
·
IF 1.852
Xiaohui Mao,Hailan Zhu,Zhong Zhao,Xiuzhu Yu
This study aims to explore the corrosion behavior of bitter almond oil (BAO) during processing. Hydrocyanic acid (HCN) and benzoic acid in oil are speculated as the main components that corrode the screw oil expeller. Immersion and simulation corrosion tests are carried out to verify this hypothesis. Immersion test results show that crude BAO (CBAO) containing 5.07 ± 0.06 mg kg −1 benzoic acid and 4.25 ± 0.04 mg kg −1 HCN exhibits corrosive effects on steel. Simulation corrosion test results indicate that the addition of CN − or benzoic acid has significant effect on the corrosion of steel. Specifically, at ≥1 × 10 4 mg kg −1 benzoic acid concentration or ≥5 mg kg −1 CN − concentration, the mass of steel blocks in oil decreases and the contents of Fe, Zn, Al, and Mg ions in oil increase significantly. Therefore, HCN in CBAO is the main cause of screw oil expeller corrosion in BAO processing and benzoic acid is the secondary cause. Practical Applications : The corrosion behavior of CBAO not only damages the integrity of the screw oil expeller but also increases the dissolution of toxic metals from the components into oil. The study of corrosion has practical value in taking effective measures, such as detoxification before pressing and addition of natural inhibitors, to reduce corrosion and ensure the quality of CBAO. Corrosion study provides the basis for the selection of steel materials of screw oil expeller.
研究领域:
食品科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 34
·e202301948
·
IF 2.1
Hai-Bo Wu,Xian-Tai Zhou,Xiao-Wu Zhou,Yan-Xiong Fang
Graphical Benzoic acid has been proved to be an efficient catalyst for the ring-opening polymerization of ϵ-caprolactone under mild conditions. A monomer-activated ring-opening polymerization mechanism mediated by benzoic acid was proposed. It is expected to realize the one-step preparing of poly (ϵ-caprolactone) through the direct aerobic oxidation of cyclohexanone. The development of a feasible industrial method for poly(ϵ-caprolactone) (PCL) preparation is great of significant and challenging. The bulk ring-opening polymerization of ϵ-caprolactone (ϵ-CL) using various organic acid catalysts and benzyl alcohol (BnOH) as the initiator was developed. Benzoic acid (BA) has been proved to be an efficient catalyst for the ROP of ϵ-CL under mild conditions. The conversion of ϵ-CL to PCL was 84.7 % under the optimized reaction conditions, with number-average molecular weight ( M n ) and dispersity (PDI) of 7700 g/mol and 1.25, respectively. Moreover, a monomer-activated ring-opening polymerization mechanism mediated by benzoic acid was proposed. Overall, this work is expected to provide a feasible industrial method for the preparation of PCL using benzoic acid as organocatalyst.
研究领域:
高分子化学
·
有机催化
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2016
·
IF 3.698
Yiqun Chen,Pinya Deng,Pengchao Xie,Ran Shang,Zongping Wang,Songlin Wang
We evaluated the degradation of methylparaben (MeP) and ethylparaben (EtP), two representative parabens, using the heat-activated persulfate system in a laboratory. Both sulfate and hydroxyl radicals contributed to the removal of the two parabens. The degradations of both MeP and EtP were improved by increasing the heating temperature or persulfate dose in accordance with a pseudo-first-order reaction model. The oxidation efficiency of parabens was found to be pH-dependent; decreasing in the order pH 5.0 > 7.0 > 9.0. The presence of chloride, bicarbonate , or humic acid was found to inhibit the degradation of the two parabens to some extent because of competition for the reactive radicals, with humic acid having the most serious effect. Dealkylation of the methyl unit, decarboxylation of the carboxylic group, and subsequent hydrolysis are proposed to be involved in the degradation pathway of MeP. The results suggest that the heat-activated persulfate system might be efficiently applied in the treatment of paraben-containing water samples. This was also supported by the results of applying this system to treat a real water sample containing both MeP and EtP.
研究领域:
环境科学
·
化学工程
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DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2017
·
IF 3.012
Waqar Uddin,Gang Hu,Lin Hu,Yanyang Hu,Zhaohui Fang,Rooh Ullah,Xuanxuan Sun,Yu Zhang,Jimei Song
A new technique for identification of two aromatic isomers between 2-hydroxy benzoic acid (2-HBA) and 3-hydroxy benzoic acid (3-HBA) was finalized by using their perturbation effects on a Briggs-Rauscher (BR) oscillator, in which a tetraazamacrocyclic Ni complex, [NiL](ClO 4 ) 2 was used as catalyst. The ligand L in the complex is 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene. By putting two isomers into this BR oscillator, the 2-HBA caused a decrease in potential (amplitudes), an increase in the period of oscillation (∆ T) and a decrease in number of the oscillation cycle (n) while no influences of 3-HBA on the BR oscillation were observed. Hence, these two aromatic isomers of hydroxy benzoic acid (HBA) were identified in the range from 1 × 10 − 5 to 2.2 × 10 − 4 mol L − 1 . Reaction mechanism of BR has been proposed with reference to the NF and FCA models. An explanation of perturbation mechanism for the BR is that, only 2-HBA reacted with IO 2 • to form 1,2-quinone while the 3-HBA didn't.
研究领域:
化学
·
分析化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）