CHEMICAL ENGINEERING COMMUNICATIONS
·
2023
·
IF 2.5
Yilin Zhao,Nengcheng Zhou,Min Hua,Xiuxia Guo,Wenxing Zhang,Huichun Jiang,Xuhai Pan,Juncheng Jiang
In this article, the thermal stability of tert-butyl perbenzoate (TBPB) mixed with different concentrations of toluene and p-tert-butylcatechol (TBC) was investigated. The exothermic onset temperature (T0), the heat of decomposition (ΔH), and the adiabatic temperature rise (ΔTad) of the samples were obtained by differential scanning calorimetry (DSC) and Phi-TEC II adiabatic calorimetry. The apparent activation energy (Ea) and the maximum reaction rate arrival time under adiabatic conditions were obtained by adiabatic kinetic calculations for 8 h (TD8) and 24 h (TD24). Based on Semenov’s theory, the self-accelerated decomposition temperature was calculated as a support for safe storage and transport. The results of DSC and Phi-TEC II showed that toluene was effective in reducing the thermal hazard during the decomposition of TBPB. The addition of TBC caused side reactions. The moderate addition of toluene and TBC improves the thermal stability of TBPB and can improve the safety of TBPB in industrial applications.
研究领域:
化学工程
·
安全科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY
·
2020
·Vol. 97
·期 8
·879-888
·
IF 1.659
Qin Ye,Chaosheng Xia,Xiaohua Nie,Xianghe Meng
2- tert -Butyl-1,4-benzoquinone (TBBQ), the main oxidation product of tert -butyl-hydroquinone (TBHQ) during frying, is cytotoxic and its residual levels in frying oils and foods are unknown. In this study, TBBQ residues have been evaluated during the preparation of french fries. Results showed that frying at 140 °C resulted in the highest TBBQ peak concentration (48.42 mg kg −1 ) compared with frying at 190 or 170 °C. This unexpected finding can be attributed to more extensive hydrolytic reaction when frying at the lower temperature, generating more peroxyl radicals. TBBQ concentrations proved to be independent of the oil type among various unsaturated oils. However, higher TBBQ levels were observed in saturated palm oil and crude soybean oil than in unsaturated oil or refined oil. Continuous frying leads to the accumulation of a large amount of TBBQ in fried food. After frying 1–5 batches, TBBQ levels in both the frying oil and fries were above 10 mg kg −1 , exceeding its critical cytotoxic concentration (IC 50 value of 10.71 mg kg −1 for RAW 246.7 cells in our previous study), warranting concern with respect to the safety of fried food. FTIR has been utilized as an effective tool for visually monitoring the degree of oxidation in the frying medium with respect to its hydrogen peroxide level, which contributes to the increased level of TBBQ derived from TBHQ therein.
研究领域:
食品安全
·
毒理学
·
食品化学
✓ 已验证
DOI
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2023
·
IF 4.3
Xia Jiaojiao,Liu Feng,Yan Lishi,Suo Hongbo,Qian Jingya,Zou Bin
In this study, a Zinc porphyrin based covalent organic framework (COF-366-Zn) was synthesized by imine condensation reaction . And the multi-walled carbon nanotubes(MWCNTs) were interspersed on COF-366-Zn to enhance the electron transfer between the material and the electrode surface. The composite material was used to design a COF-366-Zn/MWCNTs/Nafion/GCE sensor. The sensor performance for simultaneous electrochemical detection of antioxidants was investigated. It was found that the COF-366-Zn/MWCNTs/Nafion/GCE sensor could simultaneously detect tert-butylhydroquinone (TBHQ), butylated hydroxyanisole (BHA) and phenol in actual samples with good detection performance. At the same time, the mutual interference between the three analytes was studied. The detection limits are 0.025 μM, 0.056 μM and 0.051 μM, respectively. In addition, the sensor also exhibits excellent anti-interference performance and storage performance.
研究领域:
分析化学
·
材料科学
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2021
·
IF 7.514
Ningxiang Yu,Qin Ye,Xiaohua Nie,Chaosheng Xia,Xianghe Meng
This study aimed to obtain a reliable evaluation about addition of tert -butylhydroquinone (TBHQ), and distribution of TBHQ and 2 -tert -butyl-1,4-benzoquinone (TBBQ) contents in typical edible oils and oleaginous foods marketed in Hangzhou City. Briefly, the probability of labeled with addition of TBHQ in foods decreased from 36.45 ± 2.6% to 28.78 ± 3.7% in the period from 2018 to 2020. In the 135 analyzed samples, TBHQ contents were far less than the maximum legal additive amount, and TBBQ contents ranged from below its limit of quantification (LOQ) to 13.54 ± 1.15 mg/kg. The conversion rate from TBHQ to TBBQ in edible oils was 2.94 ± 1.17%, much lower than that in other food categories. Further research determined that the process method and food composition were the main factors for different conversion rates from TBHQ to TBBQ in various food categories. In addition, oil consumption was found to be the primary source of dietary intake of TBHQ and TBBQ.
研究领域:
食品科学
·
分析化学
·
营养学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ORGANIC PROCESS RESEARCH & DEVELOPMENT
·
2018
·
IF 3.584
Juncheng Jiang,Fusheng Cui,Saili Shen,Xiuxia Guo,Lei Ni,Yong Pan
In this study, in order to assess thermal runaway risk of two step synthesis reactions, two new risk assessment methods were proposed by combining the new assessment procedure with the risk matrix and the Stoessel criticality diagram. The thermal runaway risks of the tert-butyl peroxybenzoate (TBPB) synthesis process and the tert-butyl peracetate (TBPA) synthesis process, and the influence of the use of the pure target products on the assessment results were also studied by the new methods. The results showed that the new methods could obtain more accurate assessment results of two step synthesis reactions. Some measures should be taken to reduce the thermal runaway risks of the two synthesis processes. Furthermore, the use of the pure target products in the new methods would exaggerate the thermal runaway risks of the two step synthesis reactions.
研究领域:
化学工程
·
安全科学
·
过程安全
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Jing Jiang,Yuanyuan Wang,Xianwen Kan
Herein, a label-free and ultra-sensitive sensing strategy was proposed for the colorimetric detection of thrombin. A catechol oxidase-mimicking nanozyme, MOF-818, was in-situ uniformly synthesized on carbon cloth (CC) fibers surface by hydrothermal method, which did not aggregate during the colorimetric sensing and showed high catalytic activity to the oxidation of faint yellow colored substrate 3,5-Di- tert -butylcatechol (3,5-DTBC) to luminous yellow colored 3,5-di- tert -butyl- o benzoquinone (3,5-DTBQ). After the conjugation of aptamer on MOF-818/CC, the nanozyme composite can effectively recognize and bind thrombin, resulting in the lighter color of substrate solution and the decrease of absorbance at 414 nm. Thus, the inhibition of the nanozyme activity by the bound thrombin was employed to detect thrombin in a wide linear range and a low limit of detection of 1.4 × 10 −10 M − 1.4 × 10 −5 M and 6.4 pM, respectively, which was superior to the most of reported methods including fluorescence and electrochemical sensing, Raman spectroscopy. Meanwhile, the nanozyme composite can be easily separated from the substrate solution by a tweezers instead of the conventional centrifugation, which greatly simplified the operation process and facilitated the on-site detection. The nanozyme composite has been successfully applied for the determination of thrombin in real samples with satisfactory results. Consequently, this work is not only important for a better understanding of the unique properties of MOF-818, but also has great potential for medical diagnosis and treatment of human health.
研究领域:
分析化学
·
生物传感器
·
纳米技术
·
医学诊断
✓ 已验证
产品关联
DOI
高影响因子
Minerals
·
2024
·Vol. 14
·期 12
·1255
·
IF 2.2
Chenglong Du,Jiang Yu,Guangyi Liu
Iron ore is the main raw material of the iron and steel metallurgy industry, but quartz in iron ore reduces metallurgical efficiency and increases metallurgical costs. Therefore, iron ore desiliconization by flotation plays an important role in the iron and steel metallurgy industry. In this study, 4-tert-butyl-catechol (TBC) was designed as a collector to directly float out hematite from quartz. The micro-flotation tests demonstrated that under pH ~9.0, 1 × 10−5mol·L−1TBC recovered 98% hematite from its mixture with quartz, while the recovery of quartz was only about 17%. Zeta potential and contact angle results inferred that the adsorption affinity of TBC toward hematite was greater than that to quartz. The results of FTIR and XPS inferred that TBC adsorbed on the Fe3+sites of hematite interfaced via the O atom of its two adjacent hydroxyl groups to form a stable five-membered chelating ring at pH 9.0. This study offered new research insight on the development of novel collectors for hematite flotation through bionics technology.
研究领域:
矿物加工工程
·
材料科学与工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Yongxi Cui,Yifen Xu,Jing Song,Hongrui Liang,Hui Yan,Congyun Zhang,Zhi Wang
Benzoxazine is a newly developed thermoset resin that has attracted significant academic and industrial interest due to its excellent properties. However, improving its dielectric performance while maintaining high heat resistant is crucial for expanding its application in 5G electronics. In this study, we designed and synthesized a novel benzoxazine monomer, DFDA-PTB, using p - tert -butylphenol (PTB) as the phenol source and furfuryl diamine (DFDA), derived from furfuryl amine, as the amine source. Two additional benzoxazines with similar structures were also synthesized for comparison. The cured product, poly(DFDA-PTB), was then analyzed to explore the relationship between its structure and properties. The results indicate that the introduction of a furan ring structure enhances thermal stability and reduces the dielectric constant. Additionally, the inclusion of tert -butyl groups further lowers the dielectric constant and dielectric loss. Simulation methods were employed to study the mechanisms behind these improvements. Poly(DFDA-PTB) demonstrated superior dielectric properties, with a dielectric constant of 2.51 and a dielectric loss of 0.0018 at 10 GHz. It also exhibited excellent heat resistance, with a char yield of 45.4 % at 800 °C. These properties make poly(DFDA-PTB) a promising candidate for electronic packaging and communication applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 6
·期 6
·4803-4809
·
IF 3.84
Jing-jing Li,Fei Zhou,Xiao-dong Tang,Tao Hu,Jin Cheng
With the increasing awareness of environmental protection, deep desulfurization of methyl tert-butyl ether (MTBE), which is the most important octane booster in gasoline, is extremely urgent. Herein, a new desulfurization method, involving the combination of electrochemical oxidation and distillation, is proposed to reduce the sulfur content in MTBE. Under optimum operating conditions, the sulfur content of real MTBE decreases from 132.5 μg g−1 to 2.3 μg g−1 and the desulfurization efficiency reaches 98.25%. The oxidation products with high boiling points can be separated by distillation. FTIR analyses prove that electrochemical oxidation has no influence on the main properties of MTBE. Moreover, GC/MS is used to study the conversion of model organic sulfides (dimethyl disulfide, diethyl sulfide and butyl mercaptan) in the electrochemical oxidative desulfurization process. Finally, the possible reaction mechanism of the electrochemical oxidative desulfurization of MTBE is proposed.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2019
·
IF 3.021
Qiang Zhang,Mieko Kumasaki,Xiongmin Liu,Fan Ren,Yosuke Nishiwaki,Bo Wang,Satoshi Matsue
In this work, we investigated the thermal oxidation of methyl tert-butyl ether (MTBE) using a customer-designed mini-closed-pressure vessel test and quantitatively analyzed the hydroperoxides produced in the primary oxidation via iodimetry. Results showed that MTBE formed high levels of hydroperoxide (5053 ppm) in its autoxidation at 140 °C. While the temperature was lower than 110 °C, a known condition at which hydroperoxide was undetectable, MTBE maintained stability. One of the hydroperoxides isolated from MTBE oxidation products was identified as 1-tert-butoxymethyl hydroperoxide (TBMHP) according to liquid chromatography–mass spectrometry, 1H and 13C nuclear magnetic resonance spectroscopy, and Fourier transform infrared spectroscopy analysis. The thermal decomposition of TBMHP was assessed via differential scanning calorimeter (DSC). Results indicated that exothermic onset temperature (Tonset) and thermal decomposition heat (QDSC) of TBMHP were 108.10 °C and 1478.05 J·g–1, respectively. The activation energy of TBMHP with the Kissinger method was 76.23 kJ·mol–1. Moreover, DSC experiments were employed to study the primary oxidation of MTBE with different equivalence ratios, indicating that primary oxidation temperature (T0) of MTBE was 208.52 °C with the equivalence ratio of 0.05. Increasing the equivalence ratio led to a considerable decrease in T0.
研究领域:
化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Qing Zheng,Nannan Wu,Ruijuan Qu,Gadah Albasher,Wanming Cao,Beibei Li,Nouf Alsultan,Zunyao Wang
4- tert -butylphenol (4-tBP) is a phenolic endocrine disrupting chemical that has attracted great attention due to its wide occurrence, environmental persistence, and possible toxic effects. In this study, we systematically investigated the transformation of 4-tBP in ferrate (VI) oxidation process. The second-order reaction rate constant ( k app ) of Fe(VI) with 4-tBP decreases with solution pH, and the k app value was determined as 295 M −1 ·s −1 at pH 8.0. The removal efficiency of 4-tBP was slightly decreased by Mg 2+ and HCO 3 – , while accelerated at varying degrees by the presence of Cu 2+ and humic acid. Product analysis revealed that 4-tBP was mainly transformed into hydroxylation products, benzene-ring cleavage products, dimers and higher polymerization products via oxygen atom transfer, ring-opening of the benzene ring and radical coupling reaction. Furthermore, initial reactions of 4-tBP were rationalized by theoretical analysis of atom partial charges, frontier electron densities, and spin densities. Nearly complete removal of 4-tBP (20 μM) was achieved after 5 min of reaction in both ultrapure water and natural waters, demonstrating the feasibility of this Fe(VI) oxidation method in treating phenols-contaminated waters.
研究领域:
环境科学
·
化学动力学
✓ 已验证
DOI
PubMed
高影响因子
TOXICOLOGICAL AND ENVIRONMENTAL CHEMISTRY
·
2016
·
IF 0.634
Xirui Lv,Yue Zhou,Anguo Zhang,Lihong Zhou,Qingle Zeng
A straightforward and environment-friendly protocol for the synthesis of valuable chiral N-(tert-butylsulfinyl)imines has been developed. Different from traditional process with benzaldehydes as substrates, arylmethyl alcohols, benzylthiol, dibenzyl ether, thioether, and disulfide are used as alternative substrates to react with tert-butanesulfinamide in the presence of KOtBu under air for the synthesis of chiral N-(tert-butylsulfinyl)imines. This is a transition metal-free, mild, cost-effective, and simple process.
研究领域:
有机化学
·
环境化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）