COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Shujuan Jia,Qian Guo,Ming Shen,Qiang Gao,Kai Wang
A hydrothermal method was employed to synthesize nitrogen-doped porous carbon spheres (NPCSs), with tetraethoxysilane as the silica source, a phenolic resin , formed by the reacting 3-aminophenol with amphiphilic aliphatic aldehydes , as a carbon source and the self-assembly of imidazole cationic surfactant (1-dodecyl-3-methylimidazolium bromide) as a soft template. The effect of the carbon chain length of the fatty aldehyde on the morphology, pore parameters and electrochemical properties of the synthesized carbon nanomaterials was systematically investigated. Notably, the pyrene probe test shows that aliphatic aldehydes with different hydrophobic chain lengths are solubilized to the fence layer of the surfactant , which may increase the distance between the hydrophilic head groups of the surfactant and lead to collapsing of carbon sphere surfaces. Nonetheless, the synthesized N-doped porous carbon spheres exhibit interconnected pore structures , high surface area (1032–1040 m 2 g −1 ), large pore volume (0.82–1.30 cm 3 g −1 ), large pore size (3.73–6.32 nm) and abundant N content (5.86–6.94 at%). Moreover, Electrochemical tests in 6 M KOH demonstrated impressive electrochemical performance , with specific capacitance as high as 181 F g −1 at 1 A g −1 and an excellent rate capacity of 96% retention after 5000 cycles at 10 A g −1 .
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Wenqing Zhang,Hao Zhu,Wenjie Xie,Chuanyuan Du,Xiuqiang Fang,Ruiming Zhang,Xiaosong Hu,Yawei Lin
A novel fluorescent probe , 3-(4-((hydroxylamino)methyl)-1H-pyrazol-1-yl)-7-methoxyl coumarin (HAPMC), has been designed and synthesized. The compound exhibits exceptional fluorescence properties due to a coumarin-pyrazolyl fluorophore. Moreover, it incorporates an N -hydroxylamine functional group capable of reacting with aldehydes to yield nitrone derivatives under mild conditions. This unique combination renders it an ideal derivatization reagent for aldehyde analysis. A standard method was established for the quantitative analysis of eight fatty aldehydes by utilizing high-performance liquid chromatography with fluorescence detection (HPLC-FLD) and a pre-column derivatization process, which has low detection limits (0.3–1.2 nM), satisfactory reproducibility (intraday and interday relative standard deviations in the range of 1.29 %-2.92 % and 1.73 %-3.45 %), and an extensive linear range (25–5000 nM) with excellent linearity (R 2 ≥ 0.9989). The spiked recoveries of the fatty aldehydes range from 89.6 % to 106.0 %. The greenness and sustainability of our approach are reinforced by evaluations conducted with the AGREE and RGB 12 algorithms. The established method was successfully applied to the qualitative and quantitative detection of fatty aldehydes in nine real vegetable oil samples, including peanut, canola, rice, soybean, olive, rapeseed, corn, sunflower, and blended oils. The fatty aldehydes are known to have adverse effects on human health due to their carcinogenic and mutagenic properties. The findings revealed that hexanal and nonanal were the most prevalent saturated fatty aldehydes, with a notable increase in the total aldehyde concentration observed as the temperature and duration of heating increased. Compared to alternative analytical techniques, this pre-column derivatization method utilizing HAPMC displayed simplicity, reliability, and sensitivity. The results demonstrate the potential for broad application of this approach in various important research domains, including food quality control, environmental monitoring, and medical research.
研究领域:
食品科学
·
分析化学
·
医学研究
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2022
·
IF 4.52
Xiaohui Feng,Zhonghai Tang,Bingyao Chen,Shengnan Feng,Yu Liu,Qingshi Meng
Fatty aldehydes are the end products of lipid peroxides and are involved in a wide range of cellular biological pathways, food quality and flavour. However, the quantitative methods of analysing fatty aldehydes are limited due to the neutral properties of the carbonyl group, and their hydrophilicity and instability. In this study, a comprehensive isotope-coded derivative, 5-(dimethylamino)-1-carbohydrazide-isoquinoline (DMAQ), was developed for sensitive and accurate quantitative analysis of fatty aldehydes. The derivatives can remarkably improve the ionisation efficiency and separation performance of aldehydes and minimise matrix effects. The limit of detection of derivatised aldehydes was as low as 0.09 ng/L. The intra-day and inter-day relative standard deviations were well below 5.24 % and 7.97 %, respectively. This new method was successfully applied in fatty aldehyde analysis of fresh meat under different post-harvest processes. These results demonstrated that isotope-coded DMAQ derivatisation provides a useful tool for quantifying fatty aldehydes in complex biological samples with high accuracy and precision.
研究领域:
分析化学
·
生物化学
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
Foods
·
2023
·Vol. 12
·期 1
·217
·
IF 5.2
Hao Liu,Lixin Ma,Jianan Chen,Feng Zhao,Xuhui Huang,Xiuping Dong,Beiwei Zhu,Lei Qin
The Maillard reaction (MR) is affected by lipid oxidation, the intermediate products of which are key to understanding this process. Herein, nine aliphatic aldehyde–glutathione–ribose models were designed to explore the influence of lipid oxidation products with different structures on the MR. The browning degree, fluorescence degree, and antioxidant activity of the MR products were determined, and the generated volatile organic compounds (VOCs) and nonvolatile compounds were analyzed by gas chromatography-mass spectrometry and ultra-performance liquid chromatography-mass spectrometry. A total of 108 VOCs and 596 nonvolatile compounds were detected. The principal component and hierarchical clustering analyses showed that saturated aldehydes mainly affected the VOCs generated by the MR, while unsaturated aldehydes significantly affected the nonvolatile compounds, which changed the taste attributes of the MR products. Compared with the control group, the addition of unsaturated aldehydes significantly increased the sourness score and decreased the umami score. In addition, the addition of unsaturated aldehydes decreased the antioxidant activity and changed the composition of nonvolatile compounds, especially aryl thioethers and medium chain fatty acids, with a strong correlation with umami and sourness in the electronic tongue analysis (p< 0.05). The addition of aliphatic aldehydes reduces the ultraviolet absorption of the intermediate products of MR browning, whereas saturated aldehydes reduce the browning degree of the MR products. Therefore, the flavor components of processed foods based on the MR can be effectively modified by the addition of lipid oxidation products.Keywords:aliphatic aldehydes;ribose;glutathione;Maillard reaction;flavor;antioxidant activity
研究领域:
食品化学
·
风味科学
·
食品加工
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2025
·
IF 4
Nian Shi,Yuyang Wang,Mengyuan Lv,Xudong Xia,Zihan Li,Di Chen,Ranran Duan,Jinghua Zhang
A novel one-pot derivatization/magnetic solid-phase extraction with integrated pH adjustment (OPD/MSPE-pH) strategy was developed for the efficient and selective quantification of fatty aldehydes. This method seamlessly integrates pH regulation, derivatization, and magnetic separation in a single incubation step, where the sample solution, derivatization reagent, and magnetic composite (Fe₃O₄/MWCNTs-OH/CA) are processed together, significantly simplifying sample preparation. The magnetic composite, synthesized from Fe₃O₄ nanoparticles, hydroxylated multi-walled carbon nanotubes (MWCNTs-OH), and citric acid (CA), functions both as an acidic pH regulator and an efficient adsorbent for aldehyde-fluorenylmethyl carbazate (FMC) derivatives. Compared to conventional approaches, the OPD/MSPE-pH method exhibited superior operation efficiency, achieving low limits of detection (1.1–2.4 nM) and high recoveries (91.7–106.1%). The optimized procedure was successfully applied to plasma and spiked plasma samples, demonstrating its effectiveness in complex biological matrices. This streamlined technique eliminates the need for additional pH-adjusting reagents and centrifugation, offering a practical, rapid, and highly efficient solution for fatty aldehyde analysis. Overall, the proposed OPD/MSPE-pH method provides a robust, sensitive, and reliable analytical platform for fatty aldehyde analysis, with potential applications in broader fields with suitable modifications.
研究领域:
分析化学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EUROPEAN JOURNAL OF LIPID SCIENCE AND TECHNOLOGY
·
2017
·Vol. 119
·期 12
·1700243
·
IF 2.145
Wenlu Zuo,Xuechao Hu,Yaqiong Yang,Ling Jiang,Lujing Ren,He Huang
p -Anisidine value (AV) is an important and commonly used index to determine the second oxidation statue of edible oils, but it sometimes cannot reflect the concentrations of all the secondary products, such as saturated aldehydes. An improved method for the determination of saturated aliphatic aldehydes (SAA) in docosahexaenoic acid (DHA)-rich oils is developed in this study. This method reduces the aldehyde 2,4-dinitrophenylhydrazone adducts (DNPhydrazones) using 2-picoline borane, which can eliminate the analytical error caused by the isomerism of DNPhydrazone derivatives. The changes of SAA content during the oxidation of DHA-rich oil is subsequently monitored. Acetaldehyde (168.8 µmol kg −1 ) and propionaldehyde (78.5 µmol kg −1 ) are the two main SAAs in fresh oil, and their concentrations increase to 824.8–811.9 µmol kg −1 , respectively, after oxidation for 50 h at 80 °C. Furthermore, a Michael addition reaction is found to significantly reduce the AV of oxidized oils, from 172.5 to 11.7. Moreover, the concentration of SAAs shows no significant difference and could clearly identify the low-quality oil. These results demonstrate that SAA content might be a potential index to identify oxidized oils, which could provide a good supplementary value to the traditional AV index. Practical Applications : The method that has been developed in this study makes it possible to quantify saturated aliphatic aldehydes as markers of oxidation of oils, especially when the panisidine value (AV) cannot correctly assess the levels of secondary products. It could serve as a supplement to the AV index and could be applied to oils, fats, and food products. This work provides quantitative data regarding the amounts of saturated aliphatic aldehydes that can be present in DHA-rich oils during the oxidation process. An improved method for determinig saturated aliphatic aldehydes (SAA) in docosahexaenoic acid (DHA)-rich oils is developed. The changes of SAA content during the oxidation of DHA-rich oil is monitored. Furthermore, a Michael addition reaction is found to significantly reduce the AV of oxidized oils, from 172.5 to 11.7. The concentration of SAAs does not display significant differences and can clearly identify the low-quality oil. These results demonstrate that the SAA content might be a potential index to identify oxidized oils, which could serve as a good supplement to the AV index.
研究领域:
食品科学
·
分析化学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Kaige Zhang,Rong Guo,Yunhe Wang,Jing Wang,Qiujun Nie,Guifen Zhu
Aliphatic aldehydes are a class of organic compounds containing aldehyde groups, which are widespread, and closely related to people's daily life and health. In this work, a series of terpenes based hydrophobic deep eutectic solvents were designed and synthesized using hexafluoroisopropanol as hydrogen bond donor and menthol/thymol as hydrogen bond acceptor. Then they are used as extraction solvent in dispersive liquid-liquid microextraction for extracting and determining seven aliphatic aldehydes from drinking water and alcoholic beverage combined with high performance liquid chromatography-ultraviolet. Due to the fact that these hydrophobic deep eutectic solvents are liquid at the room temperature, a density greater than that of water, a lower viscosity (≤26.10 mPa s, 25 °C), after extraction and centrifugation, the microvolume DES-rich phase in the bottom is convenient for collection and direct analysis without further dissolution or dilution with organic solvents. Some factors affecting the extraction recovery were optimized by one variable-at-a-time and response surface methodology. Under the optimal conditions, the enrichment factors for the seven aliphatic aldehydes were 48–56. The method had good performance: linear ranges of 1.0–200, 0.5–200, 0.2–200, 0.4–400, 1.0–400, 0.4–400 and 0.4–400 μg L −1 for seven aliphatic aldehydes ( r 2 ≥ 0.9949), limits of detection of 0.1–0.5 μg L −1 , intra-day and inter-day precisions <4.9%. The recoveries of seven aliphatic aldehydes ranged from 76.0 to 119.0%. The proposed dispersive liquid-liquid microextraction method is simple, rapid, highly efficient, and green, which effectively reduces the amount of toxic chemical reagents used and their impact on the environment. Rapid and efficient detection of aliphatic aldehydes helps ensure a healthy diet and has great application prospects in food safety analysis.
研究领域:
分析化学
·
环境科学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Metabolic Engineering Communications
·
2022
·
IF 0
Yushi Liu,Wan-Qiu Liu,Shuhui Huang,Huiling Xu,Haofan Lu,Changzhu Wu,Jian Li
Fatty acid-derived products such as alkanes, fatty aldehydes, and fatty alcohols have many applications in the chemical industry. These products are predominately produced from fossil resources, but their production processes are often not environmentally friendly. While microbes like Escherichia coli have been engineered to convert fatty acids to corresponding products, the design and optimization of metabolic pathways in cells for high productivity is challenging due to low mass transfer, heavy metabolic burden, and intermediate/product toxicity. Here, we describe an E. coli -based cell-free protein synthesis (CFPS) platform for in vitro conversion of long-chain fatty acids to value-added chemicals with product selectivity, which can also avoid the above issues when using microbial production systems. We achieve the selective biotransformation by cell-free expression of different enzymes and the use of different conditions (e.g., light and heating) to drive the biocatalysis toward different final products. Specifically, in response to blue light, cell-free expressed fatty acid photodecarboxylase (CvFAP, a photoenzyme) was able to convert fatty acids to alkanes with approximately 90% conversion. When the expressed enzyme was switched to carboxylic acid reductase (CAR), fatty acids were reduced to corresponding fatty aldehydes, which, however, could be further reduced to fatty alcohols by endogenous reductases in the cell-free system. By using a thermostable CAR and a heating treatment, the endogenous reductases were deactivated and fatty aldehydes could be selectively accumulated (>97% in the product mixture) without over-reduction to alcohols. Overall, our cell-free platform provides a new strategy to convert fatty acids to valuable chemicals with notable properties of operation flexibility, reaction controllability, and product selectivity.
研究领域:
代谢工程
·
生物技术
·
化学工程
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2020
·
IF 4.192
Xiaojing Sheng,Yingnan Lin,Jianmin Cao,Yang Ning,Xueli Pang,Jihong Wu,Fanyu Kong
Sweet osmanthus (Osmanthus fragrans Lour.) (OF) is one of the ten most famous flowers in China for its unique and delicate fragrance. A combined solid-phase microextraction and solvent-assisted flavor evaporation method was used to accurately capture the overall aromatic profile and characterize the predominant odorants of fresh osmanthus with the help of gas chromatography (GC)–olfactometry and comprehensive two-dimensional GC–quadrupole time-of-flight mass spectrometry (GC × GC–QTOF–MS). Twenty-six volatiles were identified for the first time in OF. A total of 23 potent odorants, dominated by monoterpene oxides and C6 aliphatic aldehydes, were identified. The efficacy of pectinase, β-glucosidase, and their combination on the aroma enhancement of OF was evaluated by quantitation of the target aroma components using GC–triple quadrupole–MS. The total concentration of key aroma components increased in all three enzyme treatment groups, and the increase was more significant in two β-glucosidase-treated groups. Changes in odor activity values and odor spectrum values of key odorants indicated that the pectinase-treated sample had more prominent floral, green, and potato-like scents. In contrast, the β-glucosidase-treated sample had more dominant floral, woody, almond-like, and fruity notes but less green odor, which was confirmed by sensory evaluation. β-Glucosidase and pectinase complement one another very well, and together, promote a remarkable aroma enhancement in OF.
研究领域:
农学
·
食品科学
·
分析化学
·
植物生化
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）