Catalysts
·
2022
·Vol. 12
·期 4
·378
·
IF 4.501
Feng Jiang,Jiansha Gao,Di Lang
Photocatalytic studies on contaminant degradation in water suspension generally suggest that the degradation reaction mainly takes place on the surface of the photocatalysts rather than in the water phase. The mechanism of selective degradation is often difficult to distinguish concerning the contribution of adsorption and radical selectivity. This study is thus designed to investigate the roles of two types of hydroxyl radicals, adsorbed hydroxyl radical (·OHa) and free hydroxyl radical (·OHf), on the selective degradation of catechol (CT) and resorcinol (RE). CT and RE are significantly different in adsorption on a TiO2photocatalyst with a highly exposed {001} facet. CT can be selectively degraded by TiO2and was highly correlated with adsorption. Free radical quenching experiment results showed that the degradation of CT can be identified as the combined effect of both ·OHaand ·OHf, while the degradation of RE was mainly due to the ·OHf. Electron paramagnetic resonance coupled with spin trapping agents was used to detect the relative concentration of hydroxyl radicals in all the photocatalytic degradation processes. After a series analysis, we proposed that the mechanism of selective degradation mainly depends on the concentration of ·OHffor the pollutant molecules with weak adsorption on the catalyst surface.Keywords:photocatalytic;TiO2;catechol;resorcinol;hydroxyl radical;degradation selectivity
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2024
·
IF 6.2
Fengxia Chang,Jinhang Chen,Jiong Tan,Zixian Pu,Dan Wang
A new and highly sensitive voltammetric technique was described in this study for the concurrent detection of endocrine disruptors bisphenol A (BPA) and bisphenol AF (BPAF) based on carbon nanocages (CNCs) and copper oxide nanochains (CuONCs). The CNCs was prepared by the solvothermal method and characterized using various techniques. Utilizing the nanocomposite of CNCs and CuONCs, the voltammetric sensor demonstrated outstanding performance in detecting BPA and BPAF simultaneously with distinct oxidation peaks and increased current peaks. The voltammetric signals have linear relationships with the two bisphenols ranging from 0.500 μM to 100 μM with a detection limit of 0.16 µM for BPA and 0.14 µM for BPAF. The newly designed sensor showed reliable consistency, long-term durability and anti-interference ability, and performed well in analyzing real water samples, indicating great potential for environmental monitoring.
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
CHEMISTRY & BIODIVERSITY
·
2025
·
IF 2.5
Huilu Sun,Ruxue Wei,Genqiang Chen,Zhiping Che,Xiaobo Huang,Yingwu Chen,Yuee Tian
Eugenol is the main component of clove basil oil extracted from plants such as Syzygium aromaticum and Ocimum gratissimum . To discover biorational natural product-based pesticides, a series of eugenol/dihydroeugenol derivatives containing carbamate moiety were prepared by introducing an active aminooyloxy group at its C1 hydroxy position, and their structures were well characterized by proton nuclear magnetic resonance ( 1 H NMR), carbon-13 NMR ( 13 C NMR), high-resolution mass spectrometry, and melting point. Bioactivities of these target compounds as anti-oomycete and anti-fungal agents against two serious agricultural pests, Phytophthora capsici and Fusarium graminearum were evaluated. Among assessed compounds: (1) Title compounds 1b and 2b showed significant anti-fungal against F. graminearum , with half maximal effective concentration values of 29.13 and 35.04 mg/L, respectively. (2) The title compounds have obvious selectivity, and their anti-fungal activity is significantly better than their anti-oomycete activity. (3) The anti-oomycete and anti-fungal activities of introducing the aminoalkyloyloxy group at the C1 hydroxyl position of eugenol or dihydroeugenol are significantly better than that of introducing the aminoaryloyloxy group. (4) The presence of a double bond is beneficial for increasing anti-fungal activity, and the reduction of a double bond is beneficial for increasing anti-oomycete activity. Graphical
研究领域:
植物化学
·
农药科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Food Bioscience
·
2025
·
IF 5.9
Yunping Yao,Yuanyuan Jia,Yifan Yu,Changmo Li
Chili oil is a complex food matrix rich in bioactive compounds. This study investigated the dynamic changes of capsaicinoids, carotenoids, total phenolics, and tocopherols in chili oil under different cooking temperatures (80 °C, 120 °C, 150 °C) and accelerated oxidation. Additionally, a strategy to enhance the storage stability of chili oil was proposed, and the protective mechanisms of combined antioxidants were elucidated. The results revealed that capsaicin content remained stable during continuous heating but decreased by 33.84 % after 25 days of accelerated oxidation. Total phenolics and tocopherols exhibited similar degradation patterns under both conditions. Among carotenoids, capsanthin showed a strong correlation with the antioxidant capacity of chili oil. However, carotenoids degraded rapidly under high temperatures and accelerated oxidation, leading to significant colour loss. The dual-antioxidant system (200 μg/g ascorbyl palmitate and 200 μg/g gallic acid) effectively inhibited the degradation of pungency (capsaicinoids) and colour (carotenoids), while reducing the peroxide value from 42.96 mmol/kg to 3.59 mmol/kg during 25 days of storage at 60 °C. This remarkable protection was achieved through the synergistic scavenging of both oxygen and lipid free radicals by the antioxidant combination. This approach extended the shelf life of chili oil from 35.57 days to 101.03 days. These results provide a theoretical guidance and practical solution for industrial-scale chili oil preservation.
研究领域:
食品科学
·
生物化学
·
营养学
✓ 已验证
产品关联
DOI
高影响因子
DRYING TECHNOLOGY
·
2020
·
IF 2.988
Xuan Liu,Xu Yan,Jinfeng Bi,Xinye Wu,Jianing Liu,Mo Zhou
The influence of different drying techniques on guava was investigated, including phenolic components and antioxidant activities. Through drying processes, total phenolic content (TPC) increased and formation of small molecular phenolic acids (multi-methoxy benzoic acid and sinapic acid) was promoted. UPLC-ESI-QTOF-MS determination showed flavanol compounds, hydrolyzable tannins, ellagic acid conjugates and cinnamic acid derivatives were four predominant phenolics of guava. Drying treatments caused degradation of catechin and its derivatives. Contrarily, drying treatments contributed to higher contents of procyanidin trimers. Moreover, thermal drying treatments led to degradation of macromolecular tannins and formation of smaller molecular tannins and ellagic acid conjugates, while simultaneously reduced the stabilities of most intrinsic ellagic acid conjugates. Furthermore, drying processes increased the yield of cinnamic acid dihexose, probably generating from lignin or phenolics–carbohydrate complex. Freeze drying and hot air drying showed better performance on retention of TPC and enhancement of antioxidant activity (AA).
研究领域:
食品科学
·
植物化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2023
·Vol. 33
·期 7
·1817-1829
·
IF 4
Qin Yuan,Meng Fuliang,Xu Chunyu,Hu Zhenguo,Zhang Yimiao,Jia Yufei,Li Songjun,Yuan Xinhua
Low toxicity, environmentally friendly and sustainable bio-based phenol–formaldehyde (PF) resins are the primary factors and health goals that researchers need to consider when modifying PF resins. Two novel biomass-modified PF resins were synthesized using two flavonoid phenols of daidzein and naringenin with rigid backbone structures. The results show that compared with ordinary PF, the introduction of daidzein and naringenin during the synthesis of N-PF and D-PF can delay the curing reaction and results in higher curing peak temperatures. The appropriate substitution rate of daidzein and naringenin can improve the crosslinking degree, resulting in N-PF and D-PF with higher thermal stability, ablation resistance and mechanical properties. The highest carbon yield YC800 for N-PF is 59.81% (56.85%for PF-1), and the highest YC800 for D-PF is 64.39% (PF-2 with 58.15%). The maximum tensile strength and flexural strengths of N-PF are respective 33.86 MPa and 110.42 MPa (28.77 and 79.89 MPa for PF-1), and the maximum tensile strength and flexural strengths of D-PF are respective 35.61 MPa and 103.17 MPa (24.48 and 55.79 MPa for PF-2). The D-PF and N-PF resins modified and enhanced by daidzein and naringenin have lower friction coefficient and more excellent wear resistance than pure PF.
研究领域:
材料科学
·
生物质化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2015
·
IF 2.587
Meng Chen,Jiaqi Yan,Ying Tan,Yongfei Li,Zhimin Wu,Langsheng Pan,Yuejin Liu
Hydroxyalkylation of phenol with formaldehyde to bisphenol F was investigated over the metal–organic frameworks of MIL-100(Fe or Cr) and MIL-101(Fe or Cr) encapsulated with Keggin phosphotungstic acid (PTA). PTA@MIL-100(Fe or Cr)(β) and PTA@MIL-101(Fe or Cr)(β) with different β values (the molar ratio of W/M, where M = Fe or Cr) were prepared and characterized by XRD, BET, FT-IR, TG, SEM, TEM, and ICP. The research results showed that PTA@MIL-100(Fe or Cr)(β) had a higher catalytic activity than PTA@MIL-101(Fe or Cr)(β). PTA@MIL-100(Fe)(0.4) was the most effective among the studied catalysts and had excellent reusability. A 92.12% product yield and 93.01% selectivity for bisphenol F could be obtained over the PTA@MIL-100(Fe)(0.40) catalyst. The effects of the reaction time, reaction temperature, catalyst concentration, and phenol/formaldehyde molar ratio on the reaction performance were also investigated. A plausible mechanism for hydroxyalkylation of phenol with formaldehyde to bisphenol F was proposed.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
BULLETIN OF MATERIALS SCIENCE
·
2020
·Vol. 43
·期 1
·1-7
·
IF 1.392
Xiao Meng,Peng Yu,Pang Mengting,Hao Baicun,Wang Yujia,Zhang Yulian,Liao Yang,Mao Hui
Heterogeneous Pd catalysts were developed by immobilizing Pd nanoparticles (Pd NPs) onto plant polyphenol (bayberry tannin, BT) decorated γ-Al 2 O 3 . The abundant hydroxyls of plant polyphenols were capable of stabilizing the Pd NPs. Transmission electron microscopy observation confirmed that the Pd NPs with the diameter of 3.75 ± 0.5 nm were highly dispersed in the catalyst. The as-prepared Al 2 O 3 –BT–Pd catalysts were found to be highly active in mild hydrodechlorination (HDC) of 2,4-dichlorophenols (DCPs) using formic acid as a hydrogen source. The 2,4-DCPs were completely dechlorinated in 4 h at 30°C and under atmospheric pressure. During the catalytic HDC, the stabilizing capability of BT successfully prevented the leakage and aggregation of Pd NPs, thus ensuring a high cycling stability with stable and high catalytic activity. The Al 2 O 3 –BT–Pd catalysts were recycled six times, without obvious loss of activity. In the sixth cycle, the catalytic HDC yield still reached 98.29% under the same reaction conditions, superior to the control catalysts, including γ-Al 2 O 3 supported Pd NPs (Al 2 O 3 –Pd) and powdered activated carbon supported Pd NPs (AC–Pd). Furthermore, the Al 2 O 3 –BT–Pd also showed high activity in the mild catalytic HDC of 2,4,6-trichlorophenols and chlorobenzene derivatives. Our results demonstrated efficient catalysts to address the environmental issue of chlorophenol pollution.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 8
·3361
·
IF 4.6
Meilin Li,Shenrui Feng,Siyi Huang,Jacques Guillot,Fang Fang
The miteSarcoptes scabieiis responsible for the emerging or re-emerging skin disease called scabies in humans and sarcoptic mange in animals. Essential oils represent an appealing alternative strategy for the control ofSarcoptesinfections, but the commercial development of essential oils may be hampered by their inconsistency in efficacy due to their varied chemical compositions. In order to address this issue, we assessed the efficacy of six components (carvacrol, eugenol, geraniol, citral, terpinen-4-ol, and linalool) againstS. scabiei. At a concentration of 0.5%, carvacrol presented the best miticidal efficacy, with a median lethal time (LT50) value of 6.7 min, followed by eugenol (56.3 min), geraniol (1.8 h), citral (6.1 h), terpinen-4-ol (22.3 h), and linalool (39.9 h). The LC50values at 30 min for carvacrol, eugenol, and geraniol were 0.24, 0.79, and 0.91%, respectively. In conclusion, carvacrol, eugenol, and geraniol represent potential complementary or alternative agents forS. scabieiinfections in humans or animals. Our study provides a scientific basis for the development of scabicidal products based on essential oils.Keywords:Sarcoptes scabiei;scabies;terpenes;essential oils
研究领域:
药理学
·
寄生虫学
·
兽医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Foods
·
2023
·Vol. 12
·期 4
·827
·
IF 5.2
Lili Cao,Pengpeng Jia,Haotian Liu,Shengmei Kang,Shaotong Jiang,Min Pang
Fragrant rapeseed oil (FRO) is a frying oil widely loved by consumers, but its quality deteriorates with increasing frying time. In this study, the effect of high-canolol phenolic extracts (HCP) on the physicochemical properties and flavor of FRO during frying was investigated. During frying, HCP significantly inhibited the increase in peroxide, acid, p-anisidine, and carbonyl values, as well as total polar compounds and degradation of unsaturated fatty acids. A total of 16 volatile flavor compounds that significantly contributed to the overall flavor of FRO were identified. HCP was effective in reducing the generation of off-flavors (hexanoic acid, nonanoic acid, etc.) and increased the level of pleasant deep-fried flavors (such as (E,E)-2,4-decadienal). Therefore, the application of HCP has a positive effect on protecting the quality and prolonging the usability of FRO.Keywords:canolol;fragrant rapeseed oil;frying process;flavor compounds
研究领域:
食品科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 38
·e54439
·
IF 3
Zhoufeng Wang,Junwei Hu,Bolin Wang,Yingying Liu,Xiubo Long
A series of novel aromatic copolyesters derived from bisphenol B (BPB) and phenol red (PR) were synthesized by interfacial polymerization. The number- and weight-average molecular weight ( M n and M w ) of the obtained amorphous aromatic copolyesters ranged from 1.06–1.80 × 10 4 to 2.01–6.17 × 10 4 g/mol, respectively. Density functional theory calculations showed that the reactivity of BPB was similar to that of bisphenol A. The reaction activation energy of BPB with terephthaloyl and isophthaloyl chloride (TPC and IPC) was 8.23 kcal/mol, and PR with IPC and TPC was 59.30 kcal/mol. Under the influence of the ethyl side group of BPB and the pendant group of PR, the solubility of the aromatic copolymer was improved, and the glass transition temperature ( T g ) was 125.1–195.3°C, while T max could still be maintained above 525.72°C. The optical transmittance of the copolyesters at 450 nm ( T 450 ) was 69.29%–99.41%, and the tensile strength and Young's modulus were in the range of 46.79–58.59 MPa and 1.39–1.86 GPa respectively. All aromatic copolyesters exhibit good mechanical and processability properties and have great application potential as high-performance plastics.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Mingxin Xu,Jie Li,Qingyun Chang,Xiaohuan Zang,Shuaihua Zhang,Chun Wang,Zhi Wang
A molecularly imprinted triazine-based conjugated microporous polymer composite with rich porosity and good selectivity was prepared and used as the adsorbent of solid-phase extraction (SPE). The composite-based SPE for the three phenolic endocrine disrupting chemicals (nonylphenol, octylphenol and bisphenol A) in different beverages followed by derivatization with heptafluorobutyric anhydride and then detection by gas chromatography-electron capture detector was developed. The variables mainly affecting the extraction and derivatization were evaluated. Under the optimal conditions, the limits of detection (S/N = 3) of the established method for the analytes ranged from 0.12 to 1.20 µg L −1 . The linear response range of the method was 0.40–50.0 µg L −1 , with the coefficients of determination falling in the range of 0.9906–0.9994. The relative recoveries of the phenolic endocrine disrupting chemicals in spiked beverage samples at three concentration levels (high, middle, and low) were in the range of 80.6% −117% with the relative standard deviations of 3.5%-11%. The established method exhibits a potential in the monitoring of trace phenolic endocrine disrupting chemicals in real beverage samples.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 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）