JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Qingshuang Wei,Xinrong Zong,Yitao Lv,Chaoqi Wang,Jiacheng Wang,Min Zhang
Electro-activation has been an important surface modification strategy to enhance the signal of analytes on glassy carbon electrodes (GCE). However, its unique effects on certain analytes remain to be further explored. Hence, due to the electro-active hydroxyl groups (–OH), phenolic compounds were selected as the analyte to reveal it to some extent. Except for the improved electrocatalytic activity of electro-activated GCE (e-GCE) which was attributable to the improved charge transfer ability and optimized surface properties ( eg. surface area, surface roughness, and active sites), the oxygen-containing functional groups on the e-GCE surface were also identified as being of significant importance for enhanced response of phenolic compounds. After electro-activation, the newly generated C O constituted 12.81 % of the C1s spectra and 51.75 % of the O1s spectra, effectively facilitating the formation of donor–acceptor complexes between the analytes and the electrodes, thereby enhancing the adsorption of phenolic compounds. Furthermore, it was found that the structure of phenolic compounds had a remarkable impact on the response signal. The increase in the number of –OH groups involved in the electron transfer process, the increase in the number of aromatic rings, and the enhancement of the electronegativity of substituents all contributed positively to the response signal of phenolic compounds. At last, based on the great adsorption of catechol, a sensor for catechol with a sensitivity 12-fold higher than prior has been established. These results provide insights for the subsequent fabrication of green sensors for more electro-active molecules.
研究领域:
分析化学
·
电化学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 136
·期 6
·47039
·
IF 1.901
Shan Cao,Shouhai Li,Mei Li,Lina Xu,Haiyang Ding,Jianling Xia,Meng Zhang,Kun Huang
Phenolic hydroxyl gave thermal self-healing ability to phenolic polyurethanes in our previous study. To explore, the feasibility of preparing self-healing polyurethanes through polyphenols with different substituents. Urushiol, propyl gallate, catechol, and tert-butylhydroquinone were chosen for preparation of four phenolic polyurethanes, and the different factors at the structures of these polyphenols worked together led the different properties and self-healing ability. The peak temperatures of these four polyurethanes were determined by DSC in the following order: PTHFTDI-Urushiol < PTHFTDI-Catechol < PTHFTDI-Propyl gallate < PTHFTDI-Tert-butylhydroquinone. Variable-temperature FT-IR spectra displayed that PTHFTDI-Propyl gallate with electron-withdrawing substituent exhibited the lowest decomposition and healing temperatures. Meanwhile, based on TGA analysis, lower decomposition temperature suggested lower thermostability; and PTHFTDI-Urushiol with electron-donating substituent exhibited the best thermostability. At the same temperature, the healing abilities of the three polyurethanes were ranked as follows: PTHFTDI-Catechol < PTHFTDI-Urushiol < PTHFTDI-Propyl gallate. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47039.
研究领域:
材料科学
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化学
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DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
·
IF 6.9
Gao Feiyue,Zhou Chuncai,Shi Jiaqian,Huang Yan,Li Wenwen,Liu Guijian,Li Xin
Coal tar residue (CTR) is a hazardous industrial waste and its appropriate disposal evokes great concerns. In this work, superb surface area porous carbon was synthesized from extracted residue in CTR through one-pot KOH chemical activation and applied for phenol adsorption. Results revealed that micro-mesoporous porous carbon (MPC-3–850) with ultrahigh specific surface area of 5465 m 2 /g, and multiple oxygen-containing functional groups was synthesized at optimized conditions (mass proportion of KOH/MCTR was 1:3, pyrolysis temperature was 850℃). Adsorption results showed that the optimized absorbent dosage was 2 g/L, and adsorptive equilibrium time was 120 min. Maximum adsorption capacity of MPC-3–850 in experiment was reached higher than 360 mg/g and decreased at elevated temperatures. Near neutral conditions (pH=6–8) and lower co-existing ions (Mg 2+ , K + , Na + ) strength had a slightly effect on adsorption performance. Adsorption process adhered to pseudo-second-order kinetic and Freundlich isotherm models, and was exothermic and spontaneous. The adsorption mechanism included pore filling, van der Waals forces, electron donor-acceptor interaction, hydrogen-bonding interaction, and π-π interaction. MPC-3–850 had a good ability to adsorb phenol in real coke wastewater and excellent adsorption capacity after 4 desorption-adsorption cycles.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
PLANT CELL TISSUE AND ORGAN CULTURE
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2024
·Vol. 156
·期 2
·1-11
·
IF 2.3
Zhang Gaowei,Luo Liping,Tian Kaili,Ning Fangjian,Wu Dong,Sun Qifang,Yu Wenjie,Yi Shengxiang,Hao Yingbin
Dendrobium officinale is a perennial herb with medicinal and edible qualities. The growth and nutritional properties of this plant are significantly affected by the light quality. However, the impact of varying light quality on the phytochemical characteristics of tissue-cultured seedlings of D. officinale is still unknown. In this study, tissue-cultured seedlings of D. officinale were grown for ninety days under six LED lights, including white light (W), blue LED (B), red LED (R), and three composite light environments with varying quantities of red and blue light: 1:2 (R1B2), 1:1 (R1B1), and 2:1 (R2B1). The growth status and physiological signs of the seedlings were analyzed and we used high-performance liquid chromatography (HPLC), ultra-performance liquid chromatography/time-of-flight mass spectrometry (UPLC-Q/TOF-MS), and pathway enrichment analysis to thoroughly examine the metabolomic changes, with a focus on phenolic compounds. Our results indicated that R2B1 illumination led to the best growth of D. officinale seedlings, with maximal energy absorption, and phenolic contents. In conclusion, R2B1 was considered the most profitable for tissue-culture production of D. officinale .
研究领域:
植物学
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药用植物学
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代谢组学
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DOI
高影响因子
JOURNAL OF FOOD SCIENCE AND TECHNOLOGY-MYSORE
·
2024
·Vol. 61
·期 9
·1800-1810
·
IF 2.6
Wang Zeqing,Tong Yingjia,Tong Qunyi,Liu Yutong,Xu Wentian
The effects of three strains of lactic acid bacteria ( Lactobacillus plantarum , Lactobacillus rhamnosus , and Streptococcus thermophilus ) on viable counts, physicochemical indicators, phenolic profiles, antioxidant capacities, and volatile compounds in purple sweet potato juice were investigated during fermentation. The results showed the viable count of three bacteria increased and exceeded 11 log CFU/mL after fermentation. At the end of fermentation, the purple sweet potato juice exhibited an increase in total phenolic and flavonoid content. In addition, lactic acid bacteria fermentation changed the phenolic profiles and enhanced antioxidant capacities. Moreover, Pearson's correlation analysis showed that DPPH, ABTS, and hydroxyl radical scavenging capacities were positively correlated with caffeic acid and vanillic acid content ( p < 0.05). Furthermore, lactic acid bacteria fermentation improved the aroma complexity and sensory quality of purple sweet potato juice. In conclusion, this study provided useful information for the development of purple sweet potato juice fermented by lactic acid bacteria.
研究领域:
食品科学
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微生物学
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DOI
PubMed
高影响因子
Environmental Science-Processes & Impacts
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2024
·Vol. 26
·期 9
·1526-1542
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IF 4.3
Junwei Yang,Tianye Zhou,Yuting Lyu,Brix Raphael Go,Jason Chun-Ho Lam,Chak K. Chan,Theodora Nah
Many phenolic compounds (PhCs) in biomass burning and fossil fuel combustion emissions can partition into atmospheric aqueous phases (e.g., cloud/fog water and aqueous aerosols) and undergo reactions to form secondary organic aerosols (SOAs) and brown carbon (BrC). Redox-active transition metals, particularly Fe and Cu, are ubiquitous species in atmospheric aqueous phases known to participate in Fenton/Fenton-like chemistry as a source of aqueous ˙OH. However, even though the concentrations of water-soluble Cu are close to those of water-soluble Fe in atmospheric aqueous phases in some areas, unlike Fe, the effects that Cu have on SOA and BrC formation in atmospheric aqueous phases have scarcely been studied and remain poorly understood. We investigated the effects of Cu(II) on PhC reaction rates and BrC formation during the aqueous oxidation of four PhCs (guaiacol, catechol, syringol, and vanillin) by ˙OH generated from Fenton-like chemistry under different pH conditions. While the PhCs reacted when both H2O2 and Cu(II) were present in the absence (i.e., dark oxidation) and presence (i.e., photooxidation) of light, the reaction rates were at least one order of magnitude higher during photooxidation. Higher PhC reaction rates were measured at higher pH during both dark oxidation and photooxidation as a result of higher ˙OH concentrations produced by Fenton-like chemistry. Only water-soluble BrC was formed during dark oxidation and photooxidation when Cu(II) was present. Mass absorption coefficients (103 to 104 cm2 g−1) comparable to those of biomass burning BrC were measured during dark oxidation and photooxidation when Cu(II) was present. Light absorption was enhanced at higher pH during dark oxidation and photooxidation, which indicated that higher quantities and/or more absorbing BrC chromophores were formed at higher pH. The effects that Cu(II) had on the PhC reaction rates and the composition of SOAs and BrC formed depended on the PhC base structure (i.e., benzenediol vs. methoxyphenol). Overall, these results show how aqueous reactions involving Cu(II), H2O2, and PhCs can be an efficient source of daytime and nighttime water-soluble BrC and SOAs, which can have significant implications for how the atmospheric fates of PhCs are modeled for areas with substantial concentrations of water-soluble Cu in highly to moderately acidic cloud/fog water and aqueous aerosols.
研究领域:
大气化学
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环境科学
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DOI
高影响因子
Natural Product Communications
·
2025
·
IF 1.4
Phuong Nhung Nguyen,Ngoc Lien Nguyen,Hai Nam Pham,Phuong Khanh Nguyen,Kieu Oanh Nguyen Thi
ObjectivesPteris vittata L. is one of the hyperaccumulator plants that can grow in heavy metal-contaminated soil. This plant may tolerate metal stress through different mechanisms, eg, by producing a wide range of secondary metabolites. These compounds play an essential role in physiological function and can also serve as rich sources of chemicals for health benefit purposes. This study aims to determine the phytochemicals of plant extracts and the relationship between these profiles with pharmacological properties to predict active agents and their interaction.MethodsThe total phenolic and total flavonoid contents were measured by colorimetric assays, while the widely targeted metabolomics was applied to reveal leaf and root P. vittata metabolome. In parallel, the antioxidant and antibacterial effects of these extracts were determined by ABTS scavenging and micro-broth dilution methods. Multivariate analysis, ie, Partial Least Square Regression, calculated the correlation between metabolites and bioactivities.ResultsThe results showed the significant content of phenolics and flavonoids in plants collected from mining soils of Thai Nguyen province, Vietnam, and their potential ABTS scavenging activity. Additionally, the plant's metabolome characterized 82 compounds, mainly secondary metabolites. The multivariate analysis indicated the positive correlation among quercetin derivatives and bioactivity, suggesting the contribution of their combination, not individually, to the antibacterial effect of P. vittata.ConclusionHyperaccumulators in metalliferous soils are potential reservoirs for exploring the antibacterial agents against multi-drug resistant strains, and this effect may be exerted by additive or synergistic mechanisms of action of multiple compounds.
研究领域:
植物学
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药理学
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环境科学
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DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 68
·55363-55371
·
IF 3.84
Wai Szeto,Jiantao Li,Haibao Huang,Jin Xuan,Dennis Y. C. Leung
Novel urchin-like microparticles with photocatalytic activity and magnetically separable properties were prepared by a layer-by-layer assembly process. Photocatalytic degradation was investigated using two types of mercury vapor lamps: an ozone generating lamp emitting at both 254 nm and 185 nm as well as a germicidal lamp emitting at 254 nm only. This novel photocatalyst demonstrated superior photocatalytic activity in the mineralization of phenol under UVC illumination compared with the commercial P25, Degussa TiO2, especially in repeated usage. Importantly, this photocatalyst can be quickly separated for reuse simply by using a magnet. The merits of 3D spiny nanostructured TiO2 microparticle photocatalysts are high specific surface area, good permeability, reduced charge recombination rate and high catalytic activity while the incorporation of magnetically separable properties enables rapid and easy retrieval of the suspended photocatalyst after use.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Jing Liu,Jiao Wang,Boya Zhu,Kai Liang,Yushi Zhang,Jia Song,Linna Tu,Yu Zheng,Min Wang
Phenols are important functional compounds present in vineagr, however, their composition and formation pathways remain uncertain. Herein, non-targeted metabolomics and macrotranscriptomics methods were applied to identify phenols and analyze their formation network during the brewing process of Shanxi aged vinegar. A total of 82 phenols were detected from the raw material and the brewing process. Results indicated that phenolic acids were the major phenols and were mainly formed during acetic acid fermentation stages. Water, reducing sugars, lactic acid, and 7 amino acids influenced the formation and transformation of phenols, as shown through Spearman analysis. Furthermore, 16 genera and 38 enzymes were involved in substrates decomposition and phenols formation according to the metabolic pathway analysis, with Xenobiotics biodegradation and metabolism identified as the main pathway for phenols formation. Lactobacillus and Acetobacter were the key genera responsible for the phenols transformation. This study provides new insights into the phenols formation mechanisms in cereal vinegars and it is helpful for isolating the functional strains to reinforce the phenols formation.
研究领域:
食品科学
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微生物学
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DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2024
·Vol. 154
·期 8
·4756-4767
·
IF 2.3
Liu Kande,Wang Sitan,Zheng Lishan,Lou Shifeng,Meng Xuan,Cao Fahai,Liu Naiwang,Shi Li
The catalytic performance of Hβ zeolite treated with different concentration of NaOH on the alkylation of tert-butanol with phenol was studied. The effect of NaOH concentration on the crystallinity, morphology, textural property and acidity of Hβ zeolite was studied by X-ray diffraction (XRD), scanning electron microscope characterization (SEM), N 2 adsorption–desorption, Fourier transform infrared spectroscopy (FT-IR) and pyridine adsorption infrared spectra (Py-IR) techniques. A certain concentration of NaOH treatment can regulate the pore structure of Hβ zeolite and remove part of framework aluminum and framework silicon, thus achieving the purpose of regulating the pore structure and acidity of the catalyst. Though lower Bronsted to Lewis acid amount ratio when treated NaOH concentrations were 0.15 mol/L, leading to the increasing of selectivity to 4-TBP. The Hβ-0.2 M showed the high selectivity of 90.21% for synthesis of 4-tert-butyl-phenol (4-TBP), compared with the unmodified parent zeolite, the selectivity of 4-TBP improved 16.7%. Graphical Abstract
研究领域:
催化化学
·
材料科学
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DOI
高影响因子
Sustainable Chemistry and Pharmacy
·
2024
·
IF 5.5
Sidali Zaidi,Nassima Chaher-Bazizi,Taous Kaddour,Zineb Medjahed,Nadjet Benaida-Debbache
In recent years, significant advancements in the field of green chemistry have spurred the search for alternative solvents for the extraction of phenolic compounds. In this perspective, the objective of this study is to investigate the potential of lactic acid as an alternative solvent for extracting phenolic compounds from Pistacia lentiscus L. Utilizing ultrasound-assisted extraction methodology and response surface methodology, the aim is to optimize the extraction process. Additionally, the study encompasses phytochemical screening, evaluation of biological activity, and characterization of bioactive molecules using liquid and gas chromatography coupled with mass spectrometry. Optimization using the BBD revealed a TPC of approximately 130.17 mg Gallic acid equivalent/g dry weight, achieved at 63.5% lactic acid for 29.67 min at 44.44 °C. Furthermore, in vitro antioxidant tests showed that P.lentiscus extract exhibited potent antioxidant activity with high potential of 186.39 and 176.72 mmol trolox equivalent/100 g dry weight for DPPH• and ABTS•+, respectively. Moreover, P.lentiscus extract demonstrated strong anti-inflammatory activity, with IC 50 values of 0.027%, 0.15%, and 0.034% for NO•, COX and MPO inhibition, respectively. Phytochemical characterization also revealed the presence of organic acids and phenolic compounds, identified as novel molecules characterized for the first time in P.lentiscus leaves. These findings underscore the effectiveness of using lactic acid-based alternative extraction solvents for phenolic compounds, particularly in industrial and pharmaceutical applications.
研究领域:
植物化学
·
药理学
·
分析化学
✓ 已验证
DOI
高影响因子
POSTHARVEST BIOLOGY AND TECHNOLOGY
·
2018
·
IF 3.112
Yurong Ma,Qingfeng Ban,Jingying Shi,Tiantian Dong,Cai-Zhong Jiang,Qingguo Wang
The effects of 1-methylcyclopropene (1-MCP) treatment, storage time, and shelf life and temperature on phenolic concentrations and antioxidant activity in apple peel and flesh of ‘Jonagold’ apple ( Malus domestica Borkh) have been investigated. Hyperoside and chlorogenic acid were the most abundant phenolic compounds in the peel and flesh, respectively. The flesh had lower concentrations of individual phenolics, total phenolics, flavonoids and lower antioxidant activity (determined by 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging assay) than the peel. In addition, the profiles of phenolics as well as the changing patterns of individual phenolics also differed between the peel and the flesh. After long-time storage (180 d), the greatest decrease of concentrations was the concentrations of hyperoside (27 %) in the peel and total phenolics (35 %) in the flesh. Also, during the 90–180 d storage period, hyperoside and rutin in the peel, chlorogenic acid in the flesh, and flavonoids and antioxidant activity decreased in both peel and flesh tissues. Individual phenolics exhibited different stabilities during the early stages after harvest. 1-MCP reduced the reduction in the concentrations of hyperoside in the peel, chlorogenic acid in the flesh, and total phenolics, flavonoids and antioxidant activity in both the peel and flesh tissues during storage and shelf life. However, for quercetin and rutin, the protective effect of 1-MCP was only observed during the shelf life period. Overall, phenolic compounds responded variously to storage, shelf life, shelf temperature and 1-MCP treatment.
研究领域:
食品科学
·
植物生理学
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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）