Food Analytical Methods
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2024
·
IF 2.6
Zhang Hongtao,Gao Jiahui,Tan Lian,Zheng Li,Wang Longjie
Milk powder is a common food in most families. It is of great significance to accurately detect the quality and safety of milk powder to mitigate food safety problems. This paper presents a method for the determination of vanillin and ethyl vanillin in milk powder based on terahertz (THz) spectroscopy. Samples with varying concentration gradients of these two additives were prepared, and a terahertz time-domain spectrometer was used to collect spectral data from the samples in the 0.2 to 1.5 THz range. Seven spectral preprocessing algorithms were evaluated using the partial least squares (PLS) method, and it was found that the combination of multivariate scattering correction (MSC) and Savitzky-Golay (SG) smoothing preprocessing yielded the best results, significantly improving the accuracy of the test sets for both additives. Subsequently, nine quantitative detection methods were constructed by combining three dimensionality reduction algorithms (ant colony algorithm (ACO), competitive adaptive reweighted sampling (CARS), and successive projection algorithm (SPA)) with three regression models (support vector regression (SVR), long short-term memory (LSTM), and particle swarm optimization-back propagation (PSO-BP)). The results showed that the LSTM regression model, with dimensionality reduction performed by the CARS algorithm, performed best for detecting vanillin in milk powder, achieving a recognition rate of 94.49%. Compared to the other eight methods, this increased the recognition rate by 7.69%. Similarly, the LSTM regression model, combined with the SPA algorithm for dimensionality reduction, performed best for detecting ethyl vanillin in milk powder, reaching a recognition rate of 98.37%. This represented a 6.59% increase in recognition rate over the other eight methods, providing a novel technical approach for non-destructive testing and analysis of milk powder quality and safety.
研究领域:
食品安全
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光谱学
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生物医学工程
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DOI
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2024
·
IF 4
Shu Wang,Yong Yang,Timothy J. Tse,Martin J.T. Reaney,Fengqin Tu,Zhe Chen,Huiwen Fang,Cuixin Kang,Xiaoming Jiang,Li Zhou,Yuhong Wang
Vanillin , methylvanillin, and ethylvanillin are widely utilized as food flavorings. Oilseeds undergo alterations in their flavor profiles during growth, storage, processing, and oil extraction. To accurately identify the source and quantify the content of these three compounds in oilseeds, we have established an analytical method that utilizes solid-phase extraction coupled with ultra-high performance liquid chromatography–mass spectrometry (UPLC–MS/MS). Oilseed samples were crushed and underwent solvent extraction using water, acetonitrile , and n -hexane. The extracted components were then purified through a liquid chromatography C18 solid-phase column, dried under nitrogen, and reconstituted in a methanol–water mixture (4:1, v/v ) prior to UPLC–MS/MS analysis. Quantification of vanillin, methylvanillin, and ethylvanillin was achieved using an external standard method. A total of 34 oilseed samples were analyzed to investigate the origin of vanillin. Among these, 30 samples contained varying concentrations of vanillin, ranging from 51.1 to 1774.7 μg/kg. Furthermore, the presence of vanillin in rapeseed oil confirmed that it originated from the raw rapeseed material. The developed analytical method provides a reliable and valuable tool for screening the authentic source and content of vanillin, methylvanillin, and ethylvanillin in oilseeds, ensuring the quality and integrity of the food supply chain.
研究领域:
食品科学
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分析化学
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DOI
高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 4
·1161-1167
·
IF 4.58
Zhu Jianli,Chen Dongping,Ai Youhong,Dang Xueping,Huang Jianlin,Chen Huaixia
The authors have synthesized a dummy molecularly imprinted monolith (MIM) in the tip of a micropipette using a sol-gel method. The MIM was applied to selective solid-phase microextraction (SPME) of vanillin (VN) and methyl vanillin (MV) prior to their determination by HPLC. The MIM was characterized by thermogravimetric analysis, scanning electron microscopy and FTIR. Some parameters affecting SPME were optimized. Then, a sensitive SPME/HPLC method was developed for the determination of VN and MV in infant milk powder. Under optimized conditions, the response is linear in the 2 to 3000 μg∙kg −1 VN concentration range and in the 3 to 2000 μg∙kg −1 range for MV. The detection limits (for an S/N ratio of 3) are 0.5 and 1 μg∙kg −1 , and the recoveries are between 83 and 110% for VN and between 80 and 101% for MV.
A dummy molecularly imprinting monolith was synthesized and applied for SPME of vanillin and methyl vanillin before HPLC. The detection limits of the method for vanillin and methyl vanillin in milk powder were 0.5 and 1 μg·kg −1 , respectively.
研究领域:
分析化学
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食品科学
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DOI
高影响因子
FOOD CHEMISTRY
·
2019
·
IF 5.399
Yun-Jiao Ma,An-Qi Bi,Xiao-Yuan Wang,Lei Qin,Ming Du,Liang Dong,Xian-Bing Xu
The dispersion solid-phase microextraction (DSPE) combined with dispersion liquid–liquid microextraction (DLLME) was developed as a rapid, simple and effective pretreatment method for the determination of flavor enhancers (maltol, ethyl maltol, vanillin, methyl vanillin, ethyl vanillin) of ready-to-eat seafood products (dried squid, baked squid, fried fish, steamed abalone). Under the optimized DSPE–DLLME method, the developed method exhibited low limits of quantitation (0.20–0.50 μg g −1 ) and excellent linearity (R 2 ≥ 0.995). The recoveries of flavor enhancers in the actual samples were 83.7%–114.9%. Compared with traditional pretreatment methods, the developed DSPE–DLLME method was rapid (17 min) and easy to determine the flavor enhancers by high performance liquid chromatography with photodiode array detector (HPLC-PDA). In the actual samples, creamy compounds such as vanillin, methyl vanillin and ethyl vanillin were hardly found. However, the flavor compounds produced by thermal reactions such as maltol (except for dried squid 3) and ethyl maltol were present in all samples.
研究领域:
食品科学
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分析化学
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色谱学
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DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2024
·
IF 5.6
Chang Wu,Lin-Xia Lu,Zong-Xing Wu,Xian-Wei Cheng,Jin-Ping Guan
The versatile modification of silk fabric using a fully biobased approach is intriguing. In this study, phytic acid and vanillin, which are plant extracts, were utilized to synthesize reactive vanillin phytate ester for modifying silk fabric to achieve durable flame retardancy, antibacterial and anti-UV performance. The multifunctional properties, thermal resistance, smoke and heat suppression capacity, flame-retardant durability and mechanism of modified silk fabrics were investigated. The vanillin phytate ester imparted high antimicrobial and UV resistance to silk fabric, achieving a 97 % inhibition rate against Escherichia coli and reaching an “excellent” level of UV protection. The modified silk fabric also possessed the self-extinguishing capacity, with a limiting oxygen index value as high as 33.5 %. There was also a significant reduction of 71.7 % in peak heat release and 40 % in smoke release compared with those of the original silk. After undergoing 20 washing cycles, the modified silk fabrics also self-extinguished and passed the vertical burning test, and such good washing resistance was achieved by the Schiff base cross-linking of vanillin phytate ester on the silk fabric. An intumescent flame-retardant mechanism was also identified by char residue analyses, which was driven by the synergistic charring action of phosphate groups and aromatic structures.
研究领域:
材料科学
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纺织工程
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可持续化学
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Chang-An Xu,Wenzi Liang,Shaoheng Yang,Yang Hu,Zhuohong Yang,Hao Pang
At present, the dielectric constant of anticorrosion coatings is relatively high, which limits its application in electronic devices, and the epoxy curing agent currently used is mostly from fossil resources, which is not conducive to sustainable development. Therefore, a vanillin-based active ester curing agent (VAEI) containing an imine bond was prepared by the esterification reaction and amine aldehyde condensation reaction. Subsequently, VAEI and amino curing agents cured the epoxy resin to prepare a coating with antibacterial properties, low dielectric, and corrosion resistance. The results showed that when the content of VAEI was 5 wt %, its anticorrosion properties were basically equivalent to that of the coating prepared by the pure amino curing agent. When the content of VAEI was 14 wt %, the impedance modulus of the coating was as high as 1.00 × 109 Ω cm2 after soaking in salt water for 150 days, which was 2 orders of magnitude higher than that of the control group. In addition, the dielectric constant of the coating at 10 MHz decreased from 4.16 to 3.64, and it also exhibited excellent antibacterial properties against Escherichia coli (7.0%) and Staphylococcus aureus (19.6%). This work expands the added value of vanillin and provides a reference for the preparation of various performance coatings.
研究领域:
材料科学
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化学工程
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生物学
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DOI
高影响因子
Sustainable Energy & Fuels
·
2022
·Vol. 6
·期 6
·1616-1624
·
IF 6.813
Haofei Gao,Fengan Han,Guangyi Li,Aiqin Wang,Yu Cong,Zhizhou Li,Wei Wang,Ning Li
In this work, jet fuel range high-density polycycloalkanes, dicyclohexylmethane and dodecahydrofluorene, were first synthesized by a two-step method with vanillin and cyclohexanone, two platform compounds that can be derived from lignin. In the first step, 2-(4-hydroxy-3-methoxybenzylidene)cyclohexan-1-one, a jet fuel range C13 polycycloalkane precursor, was obtained through an acid-catalyzed aldol condensation reaction between vanillin and cyclohexanone over a series of titanium dioxide based nanometer material catalysts. Among them, sulfated titania nanofibers (STNFs) exhibited the highest activity. Over them, a high yield (81%) of 2-(4-hydroxy-3-methoxybenzylidene)cyclohexan-1-one was obtained after the reaction was carried out at 423 K for 10 h. On the basis of the characterization results, the good performance of the STNF catalyst can be attributed to its higher acid strength and higher Brønsted to Lewis acid site ratio. Subsequently, the aldol condensation product was further converted to a mixture of dicyclohexylmethane and dodecahydrofluorene by hydrodeoxygenation (HDO) under the co-catalysis of Pd/C and H-Y zeolite. According to our measurement, the cycloalkane mixture as obtained from the HDO process has a higher density (0.95 g mL−1) and lower freezing point (256 K). As a potential application, it can be blended into low freezing point jet fuels to improve their volumetric heat values.
研究领域:
化学工程
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能源科学
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DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
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2021
·
IF 3.975
Hafezeh Nabipour,Haoxin Niu,Xin Wang,Sadia Batool,Yuan Hu
There are many applications for epoxy resin as a coating material in the automotive, electronics, and aerospace industries. However, when derived from petrochemical industries, adversely affect the environment, as they are rigid and resistant to recycling due to inherent cross-linked structure. In the present study, we prepared green epoxy resin from renewable resources, able to replace the conventionally produced DGEBA thermoset . Initially, we synthesized an epoxy thermoset from vanillin-derived Schiff base epoxy monomer (VTA-EP) that was thermally cured with bio-based 5, 5′-methylenedifurfurylamine (DFA). Due to the unsaturated double bond in cured VTA-EP/DFA thermoset displayed a relatively high glass transition temperature (T g ~ 170 °C) than the DGEBA/DDM system. Also, tensile strength (60 MPa), storage modulus (3271 MPa), and elongation at break (2.8%) were higher. Additionally, the peak of heat release rate (PHRR) and the total heat release (THR) of the cured VTA-EP/DFA resin decreased, and LOI and UL-94 ratings were improved. The green epoxy thermoset exhibited good dissolution in various acidic conditions due to the degradability of the Schiff base network in contrast to DGEBA/DDM. This work demonstrates that the combination of biomass with Schiff base structure provides a versatile platform for the fabrication of multifunctional vanillin-derived epoxy thermosets.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Yaohong Zhou,Wenqi Wang,Yujing Jin,Peng Wang,Suqin Wu,Changxi Deng,Wanming Xiong,Xiaohua Zhang
Developing high-performance acid-base catalysis over perovskite for alcohol aerobic oxidation has received increasing attention, but the fundamental understanding of its surface acid-base property and performance relationship remains largely unknown. Accordingly, a series of LaFeO 3 perovskites were fabricated via modified Pechini approach with the addition of different chelating agents to modulate their respective acid-base amount and oxygen vacancy concentration, which subsequently were employed in the aerobic oxidation of vanillyl alcohol (a lignin model), to generate vanillin for elucidating the relationships between the catalytic activity of LaFeO 3 perovskite and its acid-base property as well as oxygen vacancy. The results demonstrated that existence of non-linear relationships between the vanillin yield and the acid-base amount as well as oxygen vacancy concentration of LaFeO 3 catalyst. Moreover, neither acid-base sites nor oxygen vacancies were the solely factors affecting the activity of LaFeO 3 perovskite towards vanillyl alcohol oxidation for vanillin production. Mechanism studies proclaimed that the reactive oxygen species derived from the adsorption of molecule oxygen on oxygen vacancies generated by anion defects combing with Lewis acid sites (Fe 3+ /Fe 2+ ) to yield FeO x active pairs, which jointly dominated the pathway for vanillyl alcohol oxidation to produce vanillin. Overall, this work offers guidance for designing effective perovskite-based catalysts for lignin conversion to produce value-added chemicals by selectively modulating its acid-base property and oxygen vacancy.
研究领域:
化学工程
·
材料科学
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DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2024
·
IF 5.9
Yang Luo,Lewen Huang,Jingyu Cai,Qing Jiang,Xiafeng Liao,Haowen Zhang,Yunhong Lan,Xiangyu Yin,Linxi Hou,Longqiang Xiao
Herein, we present the synthesis and characterization of a novel phosphorus-containing epoxy co-curing agent, ANVD, fabricated via a one-pot method utilizing vanillin, 1,5-diaminonaphthalene, and DOPO as raw materials. Structural analysis conducted through FTIR and NMR spectroscopy confirmed the composition of ANVD. Differential scanning calorimetry (DSC) results indicated ANVD has significant contribution to the curing crosslinking of DGEBA, resulting in a slightly decreased T g value for EP/ANVD compared to EP/DOPO, albeit still notably higher. Thermogravimetric analysis (TGA) revealed a reduction in the T 5% and T max values of EP/ANVD, yet ANVD’s superior char-forming ability increased char residue mass at elevated temperatures. Combustion tests showcased the outstanding flame retardancy of EP/ANVD, with EP/ANVD-5 exhibiting a limiting oxygen index (LOI) value of 33.2 % and achieving a V-0 rating in the UL-94 test. Furthermore, EP/ANVD-5 displayed a notable decrease of 38.6 % and 32.1 % in pHRR and av-HRR, respectively, compared to pure EP, surpassing EP/DOPO with equivalent phosphorus content. Analysis of decomposition products in both condensed and gas phases revealed ANVD’s role in forming dense and continuous expanded char layers during combustion, releasing phosphorus radicals and non-combustible gases, thus exhibiting dual-phase flame retardant effects. Additionally, EP/ANVD-3 exhibited enhanced mechanical properties, with tensile strength and modulus increasing from 68.5 MPa and 0.75 GPa to 76.5 MPa and 0.86 GPa, respectively, compared to pure EP. Overall, the introduction of the bio-based flame retardant ANVD presents promising opportunities for the utilization of bio-based materials in flame retardancy applications.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Journal of Energy Chemistry
·
2023
·
IF 13.1
Xinghua Zhang,Miaojia Song,Jianguo Liu,Qi Zhang,Lungang Chen,Longlong Ma
In this work, a “cyclopentanone-vanillin” strategy was proposed for the preparation of jet fuel range cycloalkanes from lignocellulose-derived ketones and lignin-derived aldehydes via aldol condensation and hydrodeoxygenation (HDO). Ethanolamine lactate ionic liquid (LAIL) exhibited excellent catalytic activity in the aldol condensation of cyclopentanone and vanillin. Desired mono-condensation and bi-condensation products were obtained with yield of 95.2% at 100 °C. It is found that the synergy effects between amino group of ethanolamine and hydroxyl group of lactic acid play a key role in the aldol condensation. The condensation products were converted into cycloalkanes by HDO over 5%Pd/Nb 2 O 5 catalyst. The density of the obtained HDO products is 0.89 g/cm 3 and the freezing point is lower than −60 °C. These results suggest that the resulted cycloalkanes can be used as additives to improve the density and low-temperature fluidity of the jet fuels.
研究领域:
生物化学
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能源化学
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DOI
高影响因子
GREEN CHEMISTRY
·
2023
·Vol. 25
·期 3
·1179-1190
·
IF 9.8
Yaohong Zhou,Wanming Xiong,Yujing Jin,Peng Wang,Weiqi Wei,Jiliang Ma,Xiaohua Zhang
Conversion of lignin feedstocks into aromatic chemicals is a highly desirable target for biorefineries, and their depolymerization often requires high temperatures and harsh conditions. In this work, a process optimization involving several factors, including catalyst dosage, reaction temperature, reaction time, oxygen pressure and solvent effect, towards vanillin production from the oxidation of lignin-based vanillyl alcohol in a base-free solvent over a LaFeO3 perovskite was proposed. The results pronounced that the LaFeO3 perovskite exhibited excellent catalytic performance for affording a 100.0% conversion rate of vanillyl alcohol and 33.0% vanillin yield with the addition of 0.1 g LaFeO3 dosage at 180 °C for 2 h under 1.0 MPa O2 supply in ethyl acetate solvent. Furthermore, the presence of oxygen vacancies (Fe3+–□–Fe2+) in the LaFeO3 perovskite contributed to combining with molecular oxygen to generate the active species [Fe3+O2−], which played a key role in the oxidation of vanillyl alcohol and dominated the formation pathway of vanillin. On the other hand, reusability tests manifested that the performance of LaFeO3 decreased gradually with the increase of consecutive runs and was strongly negatively related to the amount of carbon deposits, as carbon deposits would prevent vanillyl alcohol from being accessible to active sites. Nevertheless, the performance of the spent LaFeO3 catalyst could be easily regenerated by a simple calcination approach. Overall, this work provides the possibility of a scalable strategy for constructing LaFeO3-based perovskites as efficient and reusable catalysts for vanillin production from biorefinery lignin.
研究领域:
化学工程
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生物炼制
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催化材料
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DOI
高影响因子
危险品化学品经营许可证（带存储）