SENSORS
·
2018
·Vol. 18
·期 10
·3252
·
IF 2.475
Feng Zhang,Xiaojie Wang,Xu Jie,Weili Wei
Fatty acids (FAs) are of interest to the areas of food science and medicine because they are important dietary sources of fuel for animals and play important roles in many biological processes. The health effects of FAs are different due to the diversity of olefinic bonds in the alkyl chains including number, position and configuration. However, the discrimination of FAs is difficult from a chemical sensing perspective due to the lack of diversity in terms of functional groups. Until now, only a few chemosensors have been developed for selective sensing of FAs based on their overall shape, however they are still limited in discrimination of FAs with subtle structural differences, moreover, they cannot be used for rapid and in situ inspections. Herein, for the first time, we designed a test paper for in situ colorimetric inspection for FAs based on the combination of the highly selective binding of Ag+to olefinic bonds and Ag+mediated color variation of 3,3′,5,5′,-tetramethylbenzidine. As a result, the sensor exhibited high sensitivity and good selectivity for five FAs with subtle structural differences. Furthermore, our method described herein was successfully applied to monitor the structural variations of FAs and quality changes in mixture edible hot pot oils with heat treatment in time course. Hence, the test paper presented herein holds great potential in the inspection of fats and edible oils in food industries.Keywords:test paper;colorimetric sensor;fatty acid;edible oil
研究领域:
食品科学
·
医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Food Analytical Methods
·
2018
·Vol. 11
·期 12
·3380-3390
·
IF 2.245
Tang Jing,Mao Yueyuan,Guo Jiahao,Li Zirong,Zhang Chen,Jin Baokang
A glassy carbon electrode (GCE) was modified with eosin Y that was electrodeposited on GCE via continuous cycling between − 1.6 and 1.5 V (vs Ag/AgCl). This electrode was characterized by scanning electron microscopy and electrochemical impedance spectra. The resulting electrode exhibited excellent electrocatalytic activity toward the oxidation of butylated hydroxyanisole (BHA) and tert-butyl hydroquinone (TBH 2 Q); in addition, the oxidation products of BHA and TBH 2 Q were found to be the same, which was studied by CV and in situ FT-IR spectroelectrochemistry. Under the optimized condition, the oxidation peak currents were linear to BHA/TBH 2 Q in the range from 0.10 to 7.00 μg mL −1 with the detection limits of 0.01 μg mL −1 (S/N = 3) for BHA and 0.015 μg mL −1 (S/N = 3) for TBH 2 Q, respectively. Moreover, the reproducibility and repeatability of the electrode were determined. The proposed method was successfully applied in the simultaneous determination of BHA and TBH 2 Q in several edible oil samples, and satisfactory results when compared with those obtained using high-performance liquid chromatography.
研究领域:
食品科学
·
分析化学
✓ 已验证
DOI
高影响因子
FOOD SCIENCE AND BIOTECHNOLOGY
·
2016
·Vol. 25
·期 2
·631-636
·
IF 0.699
Huang Xiaojun,Nie Shaoping,Yang Meiyan,Xie Jianhua,Li Chang,Xie Mingyong
Nine different edible oil types from 7 cities in China were analyzed. Trans fatty acid (TFA) contents in edible oils were determined, TFA distribution characteristics were analyzed, and a risk assessment was performed. Total TFA contents varied from 0.075±0.011 to 2.243±0.770 g/100 g of oil, with a mean content of 0.66 g/100 g of oil. TFA contents differed among different oil types and among different cities. Generally speaking, oil samples from northern areas of China contained more TFA, and lard usually had higher levels of TFA than other oils. An exposure assessment showed that the estimated daily intake of TFA from Chinese edible oils was low, and a risk assessment indicated that there was a low risk for TFA consumption in Chinese edible oils.
研究领域:
营养学
·
食品安全
·
公共卫生
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Qian Wang,Xinyuan Zheng,Meiling Ge,Rong Chen,Fangpei Ma,Jianming Pan,Fu Yang
Maintaining the long-term stability of flexible polymer-immobilized lipase remains a significant challenge in enzyme catalysis. The deformation of the polymer during the process often damages the lipase, severely limiting its practical application. In this work, we in situ constructed rigid Zeolitic Imidazolate Framework-8 (ZIF-8) in porous hydrophobic polymer PVIm as “rigid and flexible” composite PVIm/ZIF-8 through a self-assemble strategy. The implanted rigid ZIF-8 improves the network stability of the hydrophobic polymer PVIm. Additionally, it acts as a co-factor, leveraging defective Zn sites to immobilize lipase through bonding with its amino acid moieties. This approach represents a typical two-birds-with-one-stone strategy. The optimal biocatalyst CalA@PVIm/ZIF-8(0.3) affords the highest yield of biodiesel of 82 % with a TON of 136.6 g (biodiesel) /g (CalA) from waste cooking oil under 30 °C and 24 h. Compared to CalA@PVIm/ZIF-8(0.3), the TON of free CalA is only 25 % of that value. Compared to the ZIF-8-free CalA@PVIm, CalA@PVIm/ZIF-8(0.3) exhibits near 1.2 folds enhancement of performance, further unveiling the co-factor role of ZIF-8 in the reaction. More importantly, this incorporation of ZIF-8 makes the resulted CalA@PVIm/ZIF-8(0.3) afford at least 44 days operation period and retains 83 % original activity after 16 running recycles, superior to almost all the reported immobilized lipase researches, far outperforming that (24.1 % activity after 16 cycles) of CalA@PVIm. The wide flexibility in various biodiesel synthesis can be further demonstrated, affording the practical application value of developed catalyst.
研究领域:
生物化学
·
催化材料
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2020
·
IF 4.006
Meizhen Xie,Xiyu Dong,Yan Yu,Leqi Cui
Lipid oxidation is a major food safety issue for edible oils . The objective of this study was to develop a simple method for detecting lipid oxidation through the color change of a composite film. Schiff's reagent which can form color compound with lipid oxidation products—aldehydes was incorporated into polyvinyl alcohol (PVA) to form the composite film. The effects of PVA molecular weight (Mw), Schiff's reagent/PVA ratio and glycerol content on the response of the composite film to aldehyde were investigated. Sunflower seed oil with various extent of oxidation was used to evaluate the effectiveness of the composite film for lipid oxidation detection. The results showed that the composite film formed with lower PVA Mw turned from colorless to purple upon aldehyde exposure. Higher Schiff's reagent/PVA ratio and glycerol content led to shorter response time and larger color change after aldehyde exposure. The color change of the composite film was linearly (R 2 = 0.96) related to aldehyde concentration. The oxidation status of four sunflower seed oil samples out of five were correctly identified by the composite film. Although the accuracy of this method was 80% in this study, it still shows great potential for lipid oxidation detection application.
研究领域:
食品科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Wenlu Zhang,Chunrong Wang,Beining Luo,Peihang He,Liang Li,Guoqiang Wu
Development of the active metal species with high utilization and accessibility of oil macromoleculars is one of the critical factors affecting heterogeneous metal-based catalysts for production of biodiesel . Here, we synthesized two-dimensional graphitic carbon nitride supported molybdenum ( x Mo/g-C 3 N 4 ) catalysts for the facile transesterification of waste cooking soybean oil. Various characterization results of these catalysts show the crystal structure of g-C 3 N 4 is not destroyed, however, Mo oxides phase, containing Mo 6+ and Mo 5+ state, is detected on the surface of the Mo/g-C 3 N 4 with much Mo-loading, and the ratio of Mo 6+ /Mo 5+ increases significantly with the increasing Mo loading. As expected, compared with the neat g-C 3 N 4 catalyst, the g-C 3 N 4 supported Mo catalyst exhibits a better catalytic performance; especially the 10%Mo/g-C 3 N 4 catalyst has the optimal waste cooking soybean oil conversion of 71.1% and biodiesel selectivity of 99.5%. Furthermore, the experimental parameters and catalytic reusability for the transesterification reaction over 10%Mo/g-C 3 N 4 catalyst are investigated. Moreover, the possible deactivation mechanism and regeneration method of as-prepared catalyst are also proposed. This work provides a valuable tactics for the production of clean and low-cost biodiesel from waste cooking soybean oil in the presence of efficient solid catalyst.
研究领域:
化学工程
·
可再生能源
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD AND CHEMICAL TOXICOLOGY
·
2014
·
IF 2.61
Chang Li,Shao-Ping Nie,Yong-qiang Zhou,Ming-Yong Xie
3-monochoropropane-1, 2-diol (3-MCPD) esters from edible oils are considered to be a possible risk factor for adverse effects in human. In the present study, the exposure assessment of 3-MCPD esters to Chinese population was performed. A total of 143 edible oil and fat samples collected from Chinese markets were determined for the concentrations of 3-MCPD esters. The concentration data together with the data of fats consumed were analyzed by the point evaluation and probabilistic assessment for the exposure assessment. The point evaluation showed that the mean daily intake (DI) of 3-MCPD esters were lower than the value of provisional maximum tolerable daily intake (PMTDI) of 3-MCPD (2 µg/kg BW/d). The mean DI values in different age groups obtained from probabilistic assessment were similar to the results of the point evaluation. However, in high percentiles (95th, 97.5th, 99th), the DI values in all age groups were undesirably higher than the value of PMTDI. Overall, the children and adolescents exposed more to 3-MCPD esters than the adults. Uncertainty was also analyzed for the exposure assessment. Decreasing the level of 3-MCPD esters in edible oils and consuming less oil were top priority to minimize the risk of 3-MCPD esters.
研究领域:
食品安全
·
毒理学
·
营养学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yuanchao Lu,Ruixin Xiong,Xingyu Lin,Liangxiao Zhang,Xianghe Meng,Zisheng Luo
Rapidly and sensitively evaluating the acid value (AV) of edible oils is significant to ensuring food quality and safety. Cesium lead bromide perovskite nanocrystals (CsPbBr3 NCs) are an effective candidate for AV detection; however, their instability restricts wide applications. Herein, CsPbBr3@ZIF-8 was prepared by confining and growing CsPbBr3 NCs in situ into zeolitic imidazolate framework-8 (ZIF-8) to improve the stability, and a fluorescence sensor was established to evaluate the AV of edible oils. The results present that CsPbBr3 NCs (below 5 nm) with excellent optical properties were confined and grown in situ in micropores and mesopores of ZIF-8. Meanwhile, CsPbBr3@ZIF-8 had better long-term storage, ultraviolet-irradiation, and water-exposure stabilities, compared with CsPbBr3 NCs. Given the fact that free fatty acids (the major contributor of AV) decrease the fluorescence of CsPbBr3 NCs, the fluorescence intensities of CsPbBr3@ZIF-8 were negative-linearly related to oil AV (R2 = 0.9902) in 0.04–6.00 mg of KOH/g with a 0.06 mg of KOH/g limit of detection. Besides, the practical AV recovery was 92–101% with an average relative standard deviation of 2%. Furthermore, the detection time was 20 min. The response mechanism revealed that free fatty acids could remove surface ligands and increase surface defects to prompt the aggregation of CsPbBr3 NCs and the formation of lattice fringe dislocations, inducing a decrease in the fluorescence. Thus, a stable, sensitive, reliable sensor was established to evaluate the AV of edible oils.
研究领域:
材料科学
·
食品科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2016
·
IF 2.711
Chang Li,Yongqiang Zhou,Jianpeng Zhu,Sunan Wang,Shaoping Nie,Mingyong Xie
3-chloropropane-1, 2-diol (3-MCPD) esters are a kind of food processing contaminants that especially occur in edible oil . This study investigated the impact of various factors on the formation of 3-MCPD esters in edible oil models with sodium chloride as chlorine donator during heat processing . The amount of 3-MCPD esters generated in the models were positively correlated with the concentration of sodium chloride. Fe 3+ could significantly promote the formation of 3-MCPD esters. The formation of 3-MCPD esters also depended on pH value of oil, heating temperature and time. The highest level of 3-MCPD esters were obtained at pH 4.0 (2925.3 μg/kg), at 220 °C (9509.8 μg/kg) and for 8 h (4852.4 μg/kg), respectively. 3-MCPD esters were generated much more in the continuous heating model than in the intermittent one. The results are valuable to better understand the formation of 3-MCPD esters and also can provide references for reduction of 3-MCPD esters during edible oil processing and household cooking.
研究领域:
食品科学
·
毒理学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2021
·Vol. 413
·期 7
·1983-1997
·
IF 4.157
Jing Qi,Chen Liyuan,Zhao Qiaowei,Zhou Peipei,Li Yanyan,Wang Huili,Wang Xuedong
Herein, we developed a novel effervescence-assisted dual microextraction method, abbreviated as EM-LPSH, using lighter-than-water phosphonium-based ionic liquids (LPILs) and switchable hydrophilic/hydrophobic fatty acids (SHFAs). The EM-LPSH method was utilized for quick enrichment/extraction of polycyclic aromatic hydrocarbons (PAHs) in edible oils. Owing to lower density than water, LPILs used as the first extractant were floated on the upper layer of the aqueous phase, leading to a convenient separation/collection compared with traditional heavier-than-water imidazolium-based ionic liquids. Interestingly, SHFAs play triple functions: a dispersive solvent in the microextraction process, an acidic source in effervescent reaction, and the second extractant in dual microextraction, due to switchability from hydrophilicity to hydrophobicity. Consequently, the integration of LPILs with SHFAs greatly enhanced the extraction efficiency for PAHs owing to the quick dual microextraction process. Some important variables were rigorously optimized using a one-factor-at-a-time approach. Under optimized conditions, the EM-LPSH/HPLC-FLD method provided a wide linear range (0.07~0.63–200 μg kg −1 ), satisfactory recovery (80.12–103.27%), and low limit of detection (0.02–0.19 μg kg −1 ), as well as high intra-day and inter-day precision (0.03–6.55) for six PAHs in edible oils. By using certified reference material in olive oil samples (GBW10162), the recoveries ranged from 97.40 to 98.39%, demonstrating high accuracy and precision. According to the detected levels of PAHs in six unheated and heated oils, their edible safety was evaluated in detail. In short, the newly developed method is simple, convenient, and highly efficient, thereby showing great prospects for application in conventional monitoring of trace-level PAHs in edible oils.
研究领域:
分析化学
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Food Analytical Methods
·
2018
·Vol. 11
·期 11
·3170-3178
·
IF 2.245
Wang Liao,Chen Yisheng,Ye Zhiyang,Hellmann Bernhard,Xu Xueming,Jin Zhengyu,Ma Qinqin,Yang Na,Wu Fengfeng,Jin Yamei
The cytotoxicity of phenolic antioxidants had attracted marked attention, posing serious challenges to food safety. This paper presented a screening method for two major phenolic antioxidants (butylated hydroxytoluene and tert -butylhydroquinone) added in edible oils. To specifically visualize the targeted compounds after developing with toluene/ethyl acetate/methanol 8:1:1 ( v / v / v ) to 70 mm solvent front, the plate was subjected to a standardized 1,1-diphenyl-2-picrylhydrazyl assay. In addition to synoptical eye inspection, accurate quantification was realized by modified densitometric measurements: fluorescence mode, excitation wavelength 530 nm (D 2 and W lamp) without optical filter, which offered satisfactory sensitivity (8.5–17.5 mg/kg) and acceptable linearity ( R 2 > 0.999 within 50–200 ng/zone). Moreover, the established method was validated with edible oil samples, against EU Directive 2006/52/EC. Apart from that, the unambiguous confirmation of positive results was conveniently achieved by TLC-MS interface-mediated mass spectrometry. Featuring the merits of screening conception, the proposed method not only reached the goal of accurate quantification and conclusive identification of multi-phenolic antioxidants, but also excellently balanced the simplicity, detectability, and throughput of the screening workup. Therefore, it might be an attractive alternative to conventional methods.
研究领域:
食品安全
·
分析化学
·
营养学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL SCIENCES
·
2018
·Vol. 34
·期 3
·283-289
·
IF 1.355
Xiao-Lin SHAN,Xiao-Ting LIU,Can GONG,Xu XU
The complexity of triacylglycerols (TAGs) in edible oils is largely due to the many similar unsaturated TAG compounds, which makes profiling TAGs difficult. In this study, precolumn derivatization with bromine (Br2) was used to improve the separation and detection sensitivity of TAGs in edible oils by RP-HPLC. Oil samples dissolved in n-hexane and TAGs were derived by reaction with a Br2–CCl4 (1:1, v/v) solution for 3 h at room temperature. The derivate product solution was stable and was best separated and detected by RP-HPLC using a C18 column, with a mobile phase of methanol–n-hexane (91.5:8.5, v/v) at 25°C. A detection wavelength of 230 nm was used. The results showed that the approach enabled the separation and detection of more similar TAGs by RP-HPLC. The method was applied to profile 20 types of edible oil, and the results presented the differences in the TAG profiles of various edible oils, which may be useful in the identification of edible oils.
研究领域:
食品科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）