INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Mengru Li,Hui Wang,Jing Wang,Xiaoyu Zhang,Xin Yao,Jieyao Yu,Marina Rigling,Yanyan Zhang,Xiaochun Wan,Xiaoting Zhai
Lapsang Souchong black tea enjoys a good reputation in China for its unique smoky flavor. A total of 61 odorants in smoked Lapsang Souchong (SLS) and 49 odorants in the reference sample (non-smoked Lapsang Souchong, NSLS) were identified, respectively. The odorants of tea origin decreased significantly after the smoking process, while the pyrolysis products of pine wood increased markedly. Phenols (66.6%) were the most abundant odorants in SLS, among them, 18 phenols were newly found compared to NSLS. Aroma recombinates of SLS and NSLS proved the successful identification and quantitation of their respective key aroma compounds. The omission and addition tests clearly corroborated 3-ethylphenol, p -cresol, m -cresol, and 2-methoxy-4-methylphenol were the crucial factor for the strong smoky pine aroma characteristics of SLS tea. The findings offer a new insight into the flavor role of phenols to SLS tea, which will help to deeply explore the effect of smoking process on aroma changes during tea production.
研究领域:
食品科学
·
农业化学
·
茶学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2017
·
IF 4.339
Tianye Guo,Qineng Xia,Yi Shao,Xiaohui Liu,Yanqin Wang
A new route is reported for the direct deoxygenation of lignin model compounds to aromatic hydrocarbons via the catalytic hydrogen transfer reactions over Ru/Nb 2 O 5 -SiO 2 catalyst with 2-PrOH as a hydrogen donor. It is found that Ru/Nb 2 O 5 -SiO 2 catalyst is active for the hydrodeoxygenation of p -cresol with 98.5% conversion and 84.0% yield of toluene at 230 °C, owing to the significant promotion effect of NbO x species on C O bond cleavage and the proper transfer hydrogenation activity of Ru. Furthermore, Ru/Nb 2 O 5 -SiO 2 catalyst also shows excellent performances in the transfer hydrodeoxygenation of various lignin model compounds such as 2-methoxy-4-methyl phenol, benzyl phenyl ether (α-O-4 model compound), 2-(2-methoxyphenyl)oxy-1-phenethanol (β-O-4 model compound) and even the real lignin extracted from birch, into aromatic hydrocarbons with 2-PrOH as the hydrogen donor. The reaction pathway studies of these model compounds demonstrate that the direct deoxygenation (DDO) is the main reaction route over Ru/Nb 2 O 5 -SiO 2 catalyst in the presence of 2-PrOH. Here, using 2-PrOH as a hydrogen source is found to be more selective to aromatic hydrocarbons than using molecular hydrogen. This work provides a new way for the high selective production of aromatic hydrocarbons from renewable lignin via the catalytic hydrogen transfer reactions.
研究领域:
化学工程
·
催化
·
可再生能源
·
有机化学
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Ruiting Niu,Honglin Qin,Yuan Tao,Lingdong Li,Lizhen Qiao
In this work, several new in situ deep eutectic solvents (DESs) were prepared with two low toxic phenols thymol and p -cresol as hydrogen bond donors (HBDs) and three biodegradable esters 3-hydroxyhexanoate, butyl lactate and methyl salicylate as hydrogen bond acceptors (HBAs), and the in situ formation of DESs could be achieved at room temperature . Based on the in situ formation of DESs, a dispersive liquid–liquid microextraction (DLLME) method was developed to enrich four phthalate esters (PAEs) from water and beverage samples combined with gas chromatography-flame ionization detection (GC-FID). After the most appropriate type of DES was determined, the influencing factors of the in situ DES-based DLLME procedure were explored and optimized by Design of experiment (DoE). The optimized in situ DES-based DLLME approach exhibited good linearity in the range of 1–800 µg/L with determination coefficient (R 2 ) from 0.9936 to 0.9983, limits of detection (LODs) within 0.5–2 μg/L, enrichment factors (EFs) from 256.3 to 467.1 and extraction recoveries (ERs) of 51.26 %-93.42 %. Finally, the proposed method was successfully applied for the determination of PAEs in water and beverage samples contacted with plastics, and good practical applicability was presented with the spiked recoveries of 76.17 %-118.09 %.
研究领域:
分析化学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2021
·Vol. 11
·期 1
·1-13
·
IF 4.38
Wang Zijing,Ma Peng,Wang Yisa,Hou Biyu,Zhou Can,Tian He,Li Bowen,Shui Guanghou,Yang Xiuying,Qiang Guifen,Yin Chengqian,Du Guanhua
Endoplasmic reticulum (ER) stress is a cellular state that results from the overload of unfolded/misfolded protein in the ER that, if not resolved properly, can lead to cell death. Both acute lung infections and chronic lung diseases have been found related to ER stress. Yet no study has been presented integrating metabolomic and transcriptomic data from total lung in interpreting the pathogenic state of ER stress. Total mouse lungs were used to perform LC–MS and RNA sequencing in relevance to ER stress. Untargeted metabolomics revealed 16 metabolites of aberrant levels with statistical significance while transcriptomics revealed 1593 genes abnormally expressed. Enrichment results demonstrated the injury ER stress inflicted upon lung through the alteration of multiple critical pathways involving energy expenditure, signal transduction, and redox homeostasis. Ultimately, we have presented p-cresol sulfate (PCS) and trimethylamine N-oxide (TMAO) as two potential ER stress biomarkers. Glutathione metabolism stood out in both omics as a notably altered pathway that believed to take important roles in maintaining the redox homeostasis in the cells critical for the development and relief of ER stress, in consistence with the existing reports.
研究领域:
生物学
·
生物化学
·
分子生物学
·
药理学
·
医学研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Innovative Food Science & Emerging Technologies
·
2024
·
IF 6.3
Xiya Zhang,Aixia Wang,Jiaxin Li,Yimeng Shan,Xue Gong,Hanlin Yao,Wenling Zhou,Manxing Wang,Bangqi Liang,Fengzhong Wang,Li-Tao Tong
Pickled bamboo shoots represent a type of fermented bamboo shoot product. In China, pickled bamboo shoots are regarded as the soul of Luosifen, which is a local specialty food in Liuzhou (Guangxi Zhuang Autonomous Region, China). To exemplify the uniqueness of the pickled bamboo shoots, we analyzed the pickled bamboo shoots within 10 pre-packaged Chinese Luosifen to determine the composition of volatiles and bacteria, and subsequently examined the correlation between them. The volatiles were identified using gas chromatography–mass spectrometry (GC–MS) and gas chromatography-ion mobility spectrometry (GC-IMS). Meanwhile, high-throughput sequencing technology was employed to investigate the bacterial composition. The results indicated that the pH values of the samples exhibited minimal variance (ranging from 3.71 to 4.53), while the total acid (measured as g lactic acid /L) varied (from 4.65 to 10.3 g lactic acid /L). Lactic acid, acetic acid, and succinic acid were the predominant organic acids. 50 volatiles were detected by HS-GC-MIS, and 108 volatiles were identified by HS-SPME-GC–MS. p -Cresol (76,541.67 < OAV < 248,166.67), acetic acid (482.31 < OAV < 1164.62), and hexanoic acid (108.33 < OAV < 1333.33) were the common distinctive volatiles among the 10 samples. Proteobacteria and Firmicutes, as the dominant phyla, were positively and negatively related to 1-butanol (R = 0.66, − 0.66), respectively. Industrial relevance In China, Luosifen, as a local delicacy, enjoys popularity among the public for its sour, smelly, spicy, fresh, and oily features. Among them, pickled bamboo shoots are highly sought after for their distinctive sour and refreshing flavor. Nevertheless, some individuals cannot tolerate the sour smell of pickled bamboo shoots yet still have a desire to consume Luosifen. To address this issue, it is crucial to determine what constitutes the pungent odor in pickled bamboo shoots and subsequently regulate it to meet the requirements of diverse consumers and enhance the economic benefits of the Luosifen industry. This study disclosed the stimulant flavor substances of pickled bamboo shoots in 10 pre-packaged Luosifen detected by GC–MS and GC-IMS, offering a theoretical foundation for subsequent regulation.
研究领域:
食品科学
·
微生物学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2018
·
IF 3.412
Jia Huang,Yuping Liu,Wenxi Yang,Yingqiao Liu,Yu Zhang,Mingquan Huang,Baoguo Sun
Beijing douzhi (BD) is a traditional snack in Beijing, China, and it has been listed as a part of Beijing’s intangible cultural heritage. The potent odorants that contribute to the characteristic aroma of BD were investigated by analyzing the isolates from solvent-assisted flavor evaporation (SAFE) and simultaneous distillation–extraction. Using aroma extract dilution analysis based on gas chromatography–mass spectrometry and gas chromatography-olfactometry, 31 aroma-active compounds with flavor dilution (FD) factors ranging from 1 to 2187 were identified by comparison of their odor characteristics, MS data, and retention indices with those of reference compounds. To further determine their contribution to the aroma of BD, the odorants isolated using SAFE with FD factors ≥9 were quantified, and their odor activity values (OAVs; ratio of concentration to the respective odor threshold in water) were calculated. Eleven compounds were found to have OAVs ≥ 1, which indicated they were the potent odorants that contributed substantially to the characteristic aroma of BD. Among the 11 odorants, (E,Z)-2,6-nonadienal, eugenol, methional, p-cresol, 1-octen-3-one, and 3-methylbutanoic acid were not previously identified in BD.
研究领域:
食品科学
·
分析化学
·
香料化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Yang Liu,Guiliang Li,Qiu Han,Haibo Lin,Gang Deng,Qiang Li,Fu Liu
Protein-bound uremic toxins (PBUTs) are recently thought to critically influence overall organ dysfunction, morbidity, and mortality of chronic kidney disease (CKD) patients. However, traditional hemodialysis and/or hemoperfusion processes fail to remove PBUTs efficiently due to their strong affinity with albumins. Herein, we fabricated a novel adsorptive membrane incorporating amine/polyphenol/bimetal ions complexation in the polysulfone membrane substrate, which has a higher affinity with hippuric acid, p -cresol sulfate, and indoxyl sulfonate. The complexation is a synergy of polyelectrolyte (polyethyleneimine-tannic acid) and metal-phenolic (tannic acid/metals) networks. The adsorption behavior of those three uremic toxins on the optimized adsorptive membrane was investigated by kinetic and adsorption isotherm studies. From X-ray photoelectron spectroscopy analysis assisted by Fourier transform infrared reflection spectrum, we attribute the high adsorption capacity to π-π and/or cation-π interaction with aromatic ring groups of uremic toxins. The adsorptive membrane could effectively remove albumin bounded uremic toxins and water-soluble urea through a continuous dialysis process. Besides, the membrane showed excellent hemocompatibility and minimized immune responses by suppressing complement activation. The above results showed the potential clinical application of adsorptive membranes.
研究领域:
生物医学工程
·
肾病学
·
材料科学
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2025
·
IF 12.4
Han Li,Jinrui Shi,Tao Fu,Jinwei Liu,Xiangtian Peng,Liangjie Wang,Huifang Sun,Yi Xu,Huazhang Zhao
High-temperature wastewaters can themselves activate peroxydisulfate (PDS) to remove aromatic contaminants via polymerization. This, however, may result in an insufficient carbon source for denitrification during biochemical treatment, and the formed polymers, without a proper reuse method, will be costly to handle as hazardous waste. This study demonstrates that the addition of NaOH can suppress the polymerization of aromatic contaminants, which is observed not only in simulated wastewater but also in actual coking wastewater (ACW). Taking phenol as an example, the formation of phenoxy radical (PhO•) through the reaction between SO 4 •- and phenol is the crucial step for phenol polymerization. The addition of NaOH can convert sulfate radicals (SO 4 •– ) to hydroxyl radicals (HO•), and simultaneously, HO• can quickly consume PhO•. Both processes contribute to the inhibition of phenol polymerization. After treatment with heat/NaOH/PDS, the biodegradability of ACW is significantly enhanced with a relatively low carbon source loss (around 16%). Moreover, Fourier transform-ion cyclotron resonance mass spectrometry analysis indicates that the transformation of polyphenols to highly unsaturated and phenolic compounds is beneficial for the biodegradability improvement of ACW. Therefore, the NaOH/PDS system is an effective way to utilize waste heat and enhance the biodegradability of wastewater.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2024
·
IF 2.5
Changwen Hu,Zhenhao Yao,Wenqian Zhao,Kan Zhang
Low surface free energy materials have garnered significant attention due to their exceptional properties and extensive applications, which play a pivotal role in diverse fields such as biotechnology, metallurgical processes, and electronic device manufacturing. To investigate the influence of electron effect derived from substituents on the surface properties of benzoxazine resins, three distinct benzoxazine monomers, characterized by different substituent groups, are synthesized. The monomer structures are verified using Fourier transform infrared and nuclear magnetic resonance spectroscopy. Differential scanning calorimetry tracks the polymerization behavior of benzoxazine resins, while thermogravimetric analysis valuates the thermal stability of the resulting polybenzoxazines. Then the surface properties are systematically investigated through contact angle measurement and surface free energy calculation, facilitating a comprehensive discussion on the impact of different substituents on the surface energy. These findings demonstrate that introducing trifluoromethyl leads to a substantial reduction in the surface energy of uncured resin. On the other hand, there is minimal impact on the surface free energy after undergoing elevated temperature treatments. The current study provides a foundation understanding for further developing polymers with low surface free energy.
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
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Xing Shen,Yang Chen,Xiuxiu Liu,Xuejiao Qie,Zhongping Chai,Maomao Zeng
β -Carboline heterocyclic amines ( β -CHAs), known for their synergistic neurotoxic and carcinogenic effects, are predominantly produced by humans through cigarette smoke and food and are found particularly in meats cooked at high temperatures. Few studies have explored the differences in the mechanisms of accumulation of β -CHAs in smoked meat and meat processed at high temperatures. In this research, the concentration of β -CHAs in smoked meats prepared using a variety of wood materials was measured using LC MS/MS. Additionally, key volatile organic compound markers associated with β -CHAs accumulation in smoke were identified through GC MS and multivariate statistical analysis and subsequently confirmed in a chemical simulation system. Three types of strainers, each with a distinct aperture size, were used to assess the efficacy of particle filtration in reducing β -CHAs levels in smoked meat. The findings indicated that smoke exposure indeed increases the β -CHAs content of meat. However, only the strainer capable of filtering PM2.5-sized particles reduced the amount of β -CHAs present compared to the control group. In contrast, strainers with larger pore sizes facilitated excessive accumulation of β -CHAs. The presence of aldehydes such as 1 H-pyrrole-2-carboxaldehyde, 5-methylfurfural, benzaldehyde , furfural , and nonanal exhibited a positive correlation with the accumulation of β -CHAs. Conversely, phenolic compounds , including 2-methoxy-4-vinylphenol, 2-methoxy-5-methylphenol, p- cresol, phenol, 2-methoxy-4-(1-propenyl)-, ( Z )-, phenol, 3-ethyl-, and phenol, 4-ethyl-2-methoxy-, showed a negative correlation. Thus, filters made from chelated carbonyl trap materials both chemically and physically disrupt the buildup of β -CHAs in smoked meats. The use of this approach will not only improve the quality of these products but will also contribute to decreasing the amount of inhalation pollutants released into the environment.
研究领域:
食品科学
·
毒理学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Hai-Xu Zou,Yang-Yang Xu,Xing Fan,Feng-Yun Ma,Wei-Dong Cao,De-Quan Li,Jia-Feng Song
Simulated wastewater samples, representative of coal chemical industry and comprising major constituents such as phenol , p -cresol, o -cresol, and naphthalene , were subjected to treatment in a range of catalytic ozonation systems. To prepare the catalysts for ozonation, three series of metal oxides, iron oxides , manganese oxides , and cerium oxides, were manufactured onto the surface of γ-Al 2 O 3 support in varying loadings. The determination of the optimal loading amount for each catalyst was based on the observed removal efficiency of chemical oxygen demand (COD) in phenol-containing aqueous solution. Primary small molecular organic acids formed in the aqueous solution during the degradation of phenol were analyzed by ion chromatography . The decomposition of ozone without catalyst can directly oxidize phenol, and catalytic ozonation can reach the same goal through the generation of OH. The synergy effects between ozone and the catalysts facilitate the production of highly reactive oxidizing species, leading to more efficacious degradation of phenol and an increased total concentration of organic acids till 37.8 mg/L. Radical capture experiments revealed that the generation of OH within the catalyzed ozonation system is associated with the presence of oxygen defects on the catalyst's surface, which significantly influenced the catalytic efficacy during the ozonation process. A loading of 20 %CeO2 on γ-Al2O3 support exhibited the best COD removal rate as high as 90 % due to the increased availability of lattice oxygen participating in catalytic ozonation. Thus, the methodology built for the optimization of ozonation catalyst is proven a promising way to prepare candidate catalyst for the treatment of wastewater from coal chemical industry.
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
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Wenjuan Dong,Zhuorong Fan,Ziyu Feng,Jia Shi,Xinyu Shi,Shengmei Song,Xiaojuan Gong,Wenting Liang
Phenolic compounds have increasingly serious damage to the environment, and it is imperative to develop new detection means for them. In this study, Mn-doped ZnS quantum dot (Mn/ZnS QDs) were synthesized and conjugated with horseradish peroxidase (HRP) via its ligand N-acetyl-L-cysteine (NAC) to form a bionanoconjugates with the phosphorescent response, named Mn/ZnS QDs-HRP. In the presence of a small amount of hydrogen peroxide, phenolic compounds can quench the phosphorescence of Mn/ZnS QDs-HRP, and the quenching type is speculated to be a synergistic effect of dynamic mechanism and internal filtration effect. Taking catechol as an experimental object, the phosphorescence signal of Mn/ZnS QDs-HRP showed a good linear correlation with the concentration of catechol, and the detection limit was 0.068 μM (S/N = 3). The strong anti-interference ability of room temperature phosphorescence endows the probe with excellent sensitivity, and the specific recognition performance of the enzyme makes it have excellent selectivity. Moreover, the probe exhibits good repeatability and stability. When used for actual sample detection, Mn/ZnS QDs-HRP provides stable and reliable quantification of catechol in different water samples with spiked recoveries of 92.3–104.4 %. This study provides a sensitive, convenient, and efficient phosphorescent response sensor for detecting phenolic compounds, which is of positive significance for environmental protection.
研究领域:
环境科学
·
生物化学
·
纳米技术
✓ 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）