Analytical Methods
·
2014
·Vol. 6
·期 10
·3285-3290
·
IF 1.938
Yingtang Li,Chao Yang,Jinyan Ning,Yaling Yang
In this work, cloud point extraction (CPE) was developed for the preconcentration and separation of bisphenol A (BPA), bisphenol AF (BPAF) and tetrabromobisphenol A (TBBPA) prior to high-performance liquid chromatography (HPLC) analysis. Firstly, alcohol ethoxylate (AEO9) was applied as the extractant and octanol worked as the cloud point revulsant and synergic reagent for extraction, which decreased the cloud point temperature (CPT) of AEO9 from 75 °C to 30 °C and assisted the subsequent extraction. The parameters influencing the CPE efficiency, such as AEO9 concentration, octanol volume, pH value, extraction time and temperature were systematically evaluated. Under the optimum conditions, the linear range of BPA, BPAF and TBBPA was from 0.05 to 25 mg L−1. All correlation coefficients of the calibration curves were more than 0.9988. The relative standard deviations (RSD, n = 5) were 1.6–4.7%. The limits of detection (LOD) were in the range of 0.27–0.32 μg L−1 and the limits of quantification (LOQ) were in the range of 0.71–0.98 μg L−1. The proposed method was successfully applied to the extraction of BPA, BPAF and TBBPA in river water samples as a rapid, simple, and sensitive method.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHROMATOGRAPHIA
·
2016
·Vol. 79
·期 5
·327-333
·
IF 1.332
Peng Xiaofeng,Wang Huawen,Yang Binbin,Zhan Xin,Wu Yiwei
To improve the sensitivity of capillary electrophoresis, field-amplified sample injection (FASI) was developed to determine bisphenol A (BPA), α -naphthol ( α -NAP) and β -naphthol ( β -NAP) in drinks and lake water. Parameters (sample matrix, concentration of NaCl, water plug length, sample injection time and voltage) affecting FASI have been systematically investigated. Under optimum conditions, the sensitivity was improved 17.1-, 15.8- and 9.9-fold for BPA, α -NAP and β -NAP, respectively. The detection limits of BPA, α -NAP and β -NAP were 0.071, 0.038 and 0.081 μg mL −1 and the proposed method has been successfully applied to detect BPA, α -NAP and β -NAP in drinks and lake water with recoveries of 82.0–109.3 %.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 5
·2764-2771
·
IF 3.049
Fuhang Mai,Kai Cui,Zhe Wen,Kai Wu,Fei Yan,Mengmeng Chen,Hong Chen,Yongdan Li
The conversion of guaiacol is examined at 300 °C in supercritical ethanol over a H2WO4 catalyst. Guaiacol is consumed completely, meanwhile, 16.7% aromatic ethers and 80.0% alkylphenols are obtained. Interestingly, tert-butylphenols are produced mainly with a high selectivity of 71.8%, and the overall selectivity of 2,6-di-tert-butylphenol and 2,6-di-tert-butyl-4-ethylphenol is as high as 63.7%. The experimental results indicate that catechol and 2-ethoxyphenol are the intermediates. Meanwhile, the WO3 sites play an important role in the conversion of guaiacol and the Brønsted acid sites on H2WO4 enhance the conversion and favour a high selectivity of the tert-butylphenols. The recycling tests show that the carbon deposition on the catalyst surface, the dehydration and partial reduction of the catalyst itself are responsible for the decay of the H2WO4 catalyst. Finally, the possible reaction pathways proposed involve the transetherification process and the alkylation process during guaiacol conversion.
研究领域:
化学工程
·
催化
·
有机化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2014
·
IF 2.468
Jiajia Yang,Fei Zhou,Lina Xiong,Shuqin Mao,Yinzhou Hu,Baiyi Lu
The effect of stir-frying Carya cathayensis kernels at varying temperatures (200 °C–400 °C) and time periods (10 min–30 min) on total phenolic contents (TPC), phenolic acids, tocopherols , phytosterols and antioxidant capacity was investigated. The concentrations of TPC, phenolic acids, tocopherols and phytosterols in raw C. cathayensis kernels were 19.4 mg gallic acid equivalent/g dry weight, 3.67 mg/g, 79.5 μg/g and 1.00 mg/g, respectively. The antioxidant from the water and the oil-soluble part of C. cathayensis kernels were 78.3 mg Trolox equivalent/g dry weight (DPPH radical-scavenging activity) and 0.03 mg meq/kg (Peroxide value), respectively. Stir-frying at a low temperature over a short time period led to an apparent increase of the studied compounds and antioxidant capacity. However, these values decreased with heating time and temperature increased. In conclusion, it is benefit for stir-frying at a suitable temperature and over a suitable time period during the processing of C. cathayensis .
研究领域:
食品科学
·
植物化学
·
营养学
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2012
·
IF 3.655
Qin Liu,Li Wu,Huiming Pu,Chunyang Li,Qiuhui Hu
The profile and distribution of soluble and insoluble phenolics in 10 rapeseed ( Brassica napus ) varieties were studied in this work. Photometric results show that the soluble total phenolic content (TPC) and the total tannin content (TTC) of rapeseed dehulled flours are much higher than those of rapeseed hulls. Soluble and insoluble phenolics were further analysed by HPLC/MS and MS/MS. For soluble phenolics, seven species were identified and quantified. Sinapine was found to be the major component in both defatted rapeseed hulls and dehulled flours, with its content ranging from 0.93 to 1.76 mg/g and 15.65 to 21.88 mg/g, respectively. For insoluble phenolics, eight phenolic acids were detected in rapeseed hulls, while only two of them were found in their dehulled flours. Sinapic acid and protocatechuic acid, which also were found in dehulled flours, were identified as two major insoluble phenolics in rapeseed hulls. Insoluble TPCs in defatted rapeseed hulls and dehulled flours were shown to be in the similar range.
研究领域:
植物化学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Qingxiang Zhou,Man Lei,Yalin Wu,Xianqi Zhou,Hongyuan Wang,Yi Sun,Xueying Sheng,Yayan Tong
Present study prepared a new magnetic and thermo dual-responsive core-shell nanomaterial (Fe@SiO 2 @poly(N-isopropylacrymide-co-methacrylic acid, Fe@SiO 2 @PNIPAM-co-MAA), which was characterized by transmission electron microscopy and X-ray diffraction techniques. The new nanomaterials integrated with the magnetism of nanoscale zero valent iron material and thermo-response of the copolymers , and were utilized to investigate the adsorption capacity for typical phenols such as bisphenol A, phenol and hydroquinone from water samples, and the results showed that the magnetic and thermo dual-responsive core-shell nanomaterial exhibited good adsorption ability to typical phenols. Based on these, a sensitive method was developed for the determination of bisphenol A, phenol and hydroquinone using as-prepared magnetic nanoparticles as the magnetic solid phase extraction sorbent prior to high performance liquid chromatography coupled with variable wavelength detection. Under the optimal conditions, linear linearity was obtained over the range of 0.1–500 μg L −1 with the correlation coefficients (r 2 ) above 0.996. The detection limits of three analytes were in the range of 0.019–0.031 μg L −1 , and the precisions were all less than 4.8% (n = 6). The developed method was evaluated with real water samples and excellent spiked recoveries in the range of 94.0–105.4% were achieved. These results indicated that the proposed method was a robust analytical tool and a useful alternative for routine analysis of such pollutants.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2017
·
IF 3.034
Li Luo,Yuan Yang,Qiang Wang,Hai-pu Li,Zhou-fei Luo,Zhi-peng Qu,Zhao-guang Yang
The presence of endocrine disrupting chemicals such as 4- n -octylphenol, 4- n -nonylphenol and bisphenol A in environmental samples and artificial products may cause health problems for human and organisms. This developed method was efficient for monitoring of those tracing emerging contaminates and the Plackett-Burman factorial design introduced in extraction step was timesaving. Matrix effect was also considered to ensure proper quantitation. Good linearity (r 2 > 0.99), low Method Detection Limits (MDL) and Method Quantitation Limits (MQL) range from 0.18 to 0.54 ng/g and 0.60 to 1.80 ng/g were obtained. Three level spiking experiment (4, 10, 15 ng/g) showed recoveries range from 74% to 113% for 4- n -octylphenol and 4- n -nonylphenol with RSD range from 2% to 11%. The method was finally applied to the analysis of real fish samples taken from Hunan Province, China, offering a reliable and effective means for monitoring of trace emerging contaminates in fishes largely consumed by residents.
研究领域:
环境科学
·
分析化学
·
毒理学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 6
·5804-5813
·
IF 2.914
Meng Zhiyuan,Zhu Wentao,Wang Dezhen,Li Ruisheng,Jia Ming,Yan Sen,Yan Jin,Zhou Zhiqiang
The widespread application of bisphenols (BPs) in the industry has made them ubiquitous in the environment, causing potential environmental risks. Its unknown impacts on human being have received more and more attention. In this study, we have assessed the metabolic effects of perinatal exposure to bisphenol A (BPA) and its substitutes (bisphenol S (BPS), bisphenol F (BPF), and bisphenol AF (BPAF)) in female mice adolescent offspring and female mice adulthood offspring. 1 H NMR-based serum metabolomics showed that metabolic profiles were disturbed with BPA and its three substitutes exposure in female mice adolescent offspring and female mice adulthood offspring. In addition, age-related metabolic effects were found based on changes in serum endogenous metabolites and metabolic pathways. Specifically, metabolic pathway analysis showed that major disturbed metabolic pathways in female mice adulthood offspring compare with female mice adolescent offspring also changed significantly. With the increase of age of the female mice offspring, changes in the metabolic pathways became more obvious in the BPA treatment group. Conversely, partially disturbed metabolic pathways were restored in the BPS, BPF, and BPAF treatment groups. In conclusion, perinatal exposure to BPA and its three substitutes significantly interferes with metabolic profiles and metabolic pathways, and this metabolic effects were age-related. These results offer more detailed information about the age-related metabolic effects of perinatal exposure to BPA, BPS, BPF, and BPAF in female mice offspring and provide data for systematic evaluation of the health risk assessment of BPA and its substitutes.
研究领域:
环境毒理学
·
代谢组学
·
发育生物学
·
生殖毒理学
·
分子毒理学
·
环境健康
·
生命早期暴露
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2023
·
IF 2.8
Jiaying Zhu,Yanyang Wu,Bin Wu,Kui Chen,Lijun Ji
m-Cresol and p-cresol are widely used in medicine and pesticides as important chemical intermediates. They are generally produced as a mixture in industry and are difficult to separate due to the similarities in both chemical structures and physical properties. The adsorption behaviours of m-cresol and p-cresol on zeolites (NaZSM-5 and HZSM-5) with different Si/Al ratios have been compared by static experiments. Selectivity on NaZSM-5(Si/Al = 80) could be greater than 6.0. Adsorption kinetics and isotherms were investigated in detail. The kinetic data was correlated by PFO, PSO, and ID models, the NRMSE of which were 14.03%, 9.41%, and 21.11%, respectively. In the meanwhile, according to the NRMSE of Langmuir (6.01%), Freundlich (57.80%), D-R (1.1%), and Temkin (0.56%) isotherms, adsorption on NaZSM-5(Si/Al = 80) was mainly a monolayer and chemical adsorption process. It was endothermic for m-cresol and exothermic for p-cresol. The Gibbs free energy, entropy, and enthalpy were calculated accordingly. The adsorption of cresol isomers on NaZSM-5(Si/Al = 80) were both spontaneous, and it was exothermic (ΔH = −37.11kJ/mol) for p-cresol while endothermic (ΔH = 52.30kJ/mol) for m-cresol. Additionally, ΔS were respectively −0.05 and 0.20 kJ·mol−1·K−1for p-cresol and m-cresol, which were both close to zero. The adsorption was mainly driven by enthalpy. The result of breakthrough further demonstrated m-cresol and p-cresol could be separated effectively by NaZSM-5(Si/Al = 80). Additionally, the selectivity increased from 7.53 to 14.72 after four cycles regeneration with 9.95% and 53.96% decreases in the adsorption amounts for m-cresol and p-cresol, respectively. In conclusion, NaZSM-5(Si/Al = 80) could be a feasible adsorbent for the separation of m-cresol and p-cresol.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NATURAL PRODUCT RESEARCH
·
2018
·
IF 1.928
Kaibo Wang,Shanshan Jiang,Te Pu,Liming Fan,Fawu Su,Min Ye
The aim of this work is to explore the possibility of using the phenolic monoterpenes (PMs) as leading compounds with antifungal activity against plant disease. The in vitro antifungal activities of carvacrol and thymol against seven kinds of plant pathogenic fungi were evaluated on mycelium growth rate method, and the results showed that carvacrol and thymol exhibited broad spectrum antifungal activity. Structure requirement for the antifungal activity of PMs was also investigated. The preliminary conclusion was that phenolic hydroxyl and monoterpene were basic structures for the antifungal activity of PMs, and the position of phenolic hydroxyl showed less effect. Ester derivatives of carvacrol and thymol were more effective than carvacrol and thymol against plant pathogenic fungi. We suggested that carvacrol, thymol and their ester derivatives could potentially be used as new fungicide leading compounds.
研究领域:
植物学
·
真菌学
·
农业科学
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 5
·1-9
·
IF 5.479
Ren Hailong,Zhang Yang,Liu Longlong,Li Yangguang,Wang Dongyang,Zhang Ruyue,Zhang Wenjing,Li Yingchun,Ye Bang-Ce
Hollow molybdenum-dopamine spheres were synthesized and thermally annealed to form hollow Mo 2 C/C spheres. The morphology, composition and electrochemical behavior of spheres were characterized. A glassy carbon electrode (GCE) was modified with the spheres and then used for simultaneous detection of hydroquinone (HQ), catechol (CC), and resorcinol (RS). Distinct oxidation peaks can be observed for HQ, CC and RS at potentials of −0.004 V, 0.10 V and 0.44 V (vs. SCE). The responses to HQ, CC and RS are linear in the concentration ranges of 0.3~1000 μM, 2~2000 μM and 3~600 μM, respectively. The corresponding detection limits are 0.12, 0.19 and 1.1 μM (at S/ N = 3). The sensor was then applied to quantify HQ, CC, and RS in tap water, river water and vegetable juice. Recoveries ranged from 93.5% to 106.5%. The modified GCE is repeatable, reproducible, stable and selective for HQ, CC and RS.
Schematic presentation of a novel electrochemical sensor based on a glassy carbon electrode modified with hollow Mo 2 C/ carbon spheres for determination of hydroquinone, catechol, and resorcinol.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL LETTERS
·
2025
·
IF 1.8
Yulin Zhang,Wang Huang,Qiwei Zhang,Xu Zhang,Yanxiang Liu,Xiaoqiu Yang
Pollution from phenolic endocrine-disrupting chemicals (PEDCs) poses a significant challenge to aquatic ecosystems. However, information on their occurrence and risks in Wuhan’s two primary rivers is limited. This study analyzed nine PEDCs and water quality parameters, detecting four: 4-n-nonylphenol (22–109 ng/L), octylphenol (25.9–73.7 ng/L), bisphenol A (93.3–258 ng/L), and bisphenol S (0.42–3.30 ng/L). Concentration differences between March and April suggested rainfall may influence. Pearson’s correlation analysis showed water temperature positively correlated with PEDCs, while atmospheric pressure, dissolved oxygen, and oxidation-reduction potential were negatively correlated. Risk assessment indicated low-to-moderate risks for these PEDCs in the rivers.
研究领域:
环境科学
·
生态毒理学
·
水污染控制
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）