FOOD CHEMISTRY
·
2014
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IF 3.259
Songbai Liu,Yuanqing Fu,Si Nian
Anthocyanins are intriguing natural pigments with beneficial bioactivities and their colour is extremely susceptible to acidity variation. Minimisation of colour fluctuation is essential to maintain quality consistency in food industry. A new strategy employing surfactants to mimic encapsulation was attempted with typical anionic, cationic and nonionic surfactants and proved effective although the traditional copigmentation method was inactive. The exceptional colour fluctuation buffering effect of anionic surfactants especially sodium dodecyl sulphate (SDS) was revealed and then carefully analysed by colorimetric and spectroscopic methods. The outstanding activity of SDS presumably resulted from effective shielding of anthocyanins from external acidity through strong interaction with the positively charged flavylium cations owing to its anionic nature. These results suggest SDS is a valuable additive for buffering colour fluctuation of anthocyanins. The strategy of surfactant will be useful for buffering colour fluctuation of natural colourants.
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JOURNAL OF SEPARATION SCIENCE
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2016
·Vol. 39
·期 10
·1971-1978
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IF 2.741
Xiaozhong Wang,Xuwen Li,Lanjie Li,Min Li,Ying Liu,Qian Wu,Peng Li,Yongri Jin
A simple and sensitive method for determination of three aconitum alkaloids and their metabolites in human plasma was developed using matrix solid-phase dispersion combined with vortex-assisted dispersive liquid–liquid microextraction and high-performance liquid chromatography with diode array detection. The plasma sample was directly purified by matrix solid-phase dispersion and the eluate obtained was concentrated and further clarified by vortex-assisted dispersive liquid–liquid microextraction. Some important parameters affecting the extraction efficiency, such as type and amount of dispersing sorbent, type and volume of elution solvent, type and volume of extraction solvent, salt concentration as well as sample solution pH, were investigated in detail. Under optimal conditions, the proposed method has good repeatability and reproducibility with intraday and interday relative standard deviations lower than 5.44 and 5.75%, respectively. The recoveries of the aconitum alkaloids ranged from 73.81 to 101.82%, and the detection limits were achieved within the range of 1.6–2.1 ng/mL. The proposed method offered the advantages of good applicability, sensitivity, simplicity, and feasibility, which makes it suitable for the determination of trace amounts of aconitum alkaloids in human plasma samples.
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ANALYTICAL LETTERS
·
2016
·
IF 1.088
Juan Wang,Zhihua Li,Yaling Yang
Vortex-assisted liquid–liquid microextraction is reported for the preconcentration of chloramine-T before determination by high-performance liquid chromatography with a diode array detector. Magnetite nanoparticles were used to remove hydrophobic additives in cosmetics by physical adsorption. The method used sonication for 30 min at 45°C in 40% hydrochloric acid to convert the analyte to p-toluenesulfonamide. 1-Hexanol was the extraction solvent with vortex mixing. The extraction conditions were optimized to provide a linear dynamic range from 0.5 to 500.0µg/mL. The recovery of chloramine-T was from 90.8 to 100.9% with a relative standard deviation from 3.7 to 6.5%. The limit of detection was 8.2 mg/kg and the enrichment factor (EF) was 100. Good repeatability, quantitative recovery, and a high EF demonstrated the suitability of the procedure for the determination of chloramine-T in cosmetics.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2016
·
IF 1.835
Kewen Tang,Xiaofeng Feng,Panliang Zhang,Weifeng Xu
Liquid–liquid extraction (LLE) was used for the resolution of α-cyclopentylmandelic acid (α-CPMA) enantiomers, in which environmentally friendly and economical hydroxyethyl-β-cyclodextrin (HE-β-CD) was screened as the optimal selector. The mechanism on equilibrium of the separation system was proposed. Influence of important parameters on the separation performance of α-CPMA enantiomers were investigated (e.g., kinds of solvents for the organic phase, types and concentration of selector, pH of extraction phase, temperature). On the basis of the mechanism proposed, a quantitative model was also built to simulate the separation process. Results show that the model predicts the experimental data accurately and it is further used for optimizing the separation process. The optimized process conditions consist of 1,2-dichloroethane as organic solvent, pH = 2.5 and the extractant concentration of 0.04 mol·kg–1. Under the optimum conditions, the enantioselectivity toward α-CPMA enantiomers is over 1.70 and performance factor is 0.07.
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JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Yujie Zhen,Qingqing Yin,Fangyu Zhang,Anle Zhang,Wenxue Lu,Tao Li,Yiwu Lu,Yingmin Yu
To explore the effective treatment of acrylic acid wastewater, liquid–liquid equilibrium (LLE) data for water + acrylic acid + {n-propyl acetate, n-butyl acetate, n-heptanol, and methyl isopropyl ketone} at 303.2 K and 101.3 kPa were measured respectively. The distribution coefficients ( D ) and separation factors ( S ) were used to assess the extraction effectiveness of the four solvents, and the results of the comparative data showed that the D values of the four solvents for acrylic acid ranged from 1.6 to 4.4, and the S values were in the order of n-butyl acetate > n-propyl acetate > MIPK > n-heptanol. The experimental data were fitted by NRTL and UNIQUAC models to obtain the binary interaction parameters, and the obtained above parameters were proved reliable by the mixing surface analysis method of Gibbs energy topology. The root mean square deviation ( RMSD ) of both models did not exceed 0.0051 and 0.0077, respectively. In addition, σ-profiles analyzed the differences in extraction effects in terms of interactions and interaction energies, and the analyses showed that the theoretical calculations are in agreement with the experimental results.
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JOURNAL OF CHROMATOGRAPHY A
·
2024
·
IF 3.8
Haidong Gao,Shucai Gao,Ming Lv,Yeru Liu,Jingjing Yao,Hongwei Liu,Fayun Wang,Mantang Chen,Libin Wan
Polycyclic aromatic hydrocarbons (PAHs) have been classified as the earliest discovered class of environmental carcinogens, seriously endangering human health and ecological safety, and the hydroxylpolycyclic aromatic hydrocarbons (OH-PAHs) in human urine are considered as the main biomarkers to evaluate the exposure levels of PAHs in human body. Therefore, it is necessary to develop an accurate and sensitive method for the determination of urinary OH-PAHs. Herein, we proposed electromembrane extraction (EME) as a simple, effective and ecofriendly sample pretreatment technique for selective extraction, purification and enrichment of four typical OH-PAHs (2-naphthol, 2- and 3-phenanthrol, 2-hydroxyfluorene) in human urine for the first time. Under the optimum conditions, an analytical method of EME coupled with HPLC was established, which provided wide linear ranges for four OH-PAHs from 1 to 500 ng mL -1 with low LODs of 0.05–0.3 ng mL -1 . The average recoveries of four OH-PAHs at three spiked levels in human urine were 81.6–102.5% with RSDs all below 9.4%. The present method has been successfully applied for the sensitive determination of trace four OH-PAHs in urine samples from non-smokers and smokers with a maximum concentration of 2.24 and 3.56 ng mL -1 , respectively, which showed a great potential for the analysis of trace OH-PAHs in biological samples.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Guanmian Wei,Ziyi Zhang,Feiran Zhao,Yaxin Sang,Joe M. Regenstein,Peng Zhou
The characteristic aroma compounds of Chinese steamed bread (CSB) fermented with different starters were studied using HS-SPME-GC/MS, aroma recombination and omission experiments. The dynamic changes of the microbiota and their function and metabolites during fermentation were analyzed using metagenomics and non-targeted metabolomics. Forty-nine volatile flavor compounds were identified, while 5 characteristic aroma-active compounds were investigated in CSB fermented with commercial dry yeast (AQ-CSB), and 10 were investigated in CSB fermented with traditional starter (NY-CSB). Microbial structure and function analysis showed that Saccharomyces cerevisiae dominated during AQ-CSB fermentation and contributed >95% to its KEGG pathways, while Pediococcus pentosaceus , unclassified Pediococcus , Lactobacillus plantarum , Lactobacillus brevis and unclassified Lactobacillus were predominant in NY-CSB and together had an ~96% contribution to these pathways. NY-CSB showed higher metabolic activity during fermentation, and the characteristic metabolites were mainly involved in carbohydrate, amino acid and lipid metabolism. The characteristic aroma compounds were identified and increased the understanding of the contributions of the microbiota. This may be useful for designing starter cultures that produce CSB with desirable aroma properties.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2024
·
IF 4
Weizhe Wang,Ruirui Liu,Yufang Su,Suozai Ren,Yanmei Xi,Yun Huang,Juan Wang,Lixiang Lan,Xuelu Chi,Baoguo Sun,Nasi Ai
Odorous raw milk poses a growing threat to dairy product quality, negatively impacting both producers and consumers. However, methods for effectively identifying odorous raw milk have not been systematically established. In this study, 30 raw milk samples (RMSs) collected from different pastures were classified into 18 fresh RMSs and 12 odorous RMSs through sensory evaluation. Quantitative datasets of volatile compounds in RMSs were obtained using HS-SPME–GC–MS. Principal component analysis (PCA) and orthogonal partial least squares discriminant analysis (OPLS-DA) models identified nine key differential volatile compounds distinguishing fresh from odorous RMSs. Among these, hexanal and octanal were identified as potent odorants contributing to the off-odor in raw milk. Based on nine key difference volatile compounds, support vector machine (SVM), multilayer perceptron (MLP), and random forest (RF) algorithmic models were successfully constructed to classify RMSs to identify odorous RMSs. All models achieved classification accuracy exceeding 0.9, with the RF model performing the best, achieving an accuracy of 1.0. This work provides a reference and available workflow for identifying and labeling odorous RMSs.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Jing Wang,Hong-li Guo,Yun-feng Liu,Li Yang,Run-qin Wang,Rong-rong Xing,Xuan Chen,Shuang Hu
In this study, a ternary switchable deep eutectic supramolecular polymer (sDESP) based homogeneous liquid–liquid microextraction (HLLME) was established and applied to the preconcentration and determination of six main hepatotoxic ingredients in “Psoraleae Fructus” combined with high performance liquid chromatography-ultraviolet detection (HPLC-UVD). A hydrophilic switchable DESP with diethanolamine-heptanol deep eutectic solvent (DES) loaded into hydroxypropyl-β-cyclodextrin was used as an extraction solvent in the HLLME method, that could be converted into the hydrophobic form by injecting a phase-switching trigger. Then, the upper hydrophobic phase concentrating the target analytes was collected for chromatographic analysis after a centrifugation. Several key factors affecting the experiment, including the type of both DES and macrocyclic host molecule, the consumption of DESP, the type and volume of phase-switching trigger, the concentration of sodium chloride in the sample phase and extraction time were optimized. And the DESP extractant was characterized by Fourier transform infrared spectroscopy and proton nuclear magnetic resonance spectroscopy. Under the optimum conditions, the enrichment factors for six analytes by the sDESP were between 65 and 352, which were 1.1–1.2 times higher than those by pure DES. Good linearity ( r ≥ 0.9972), low detection limits of 0.03–0.6 ng/mL, and satisfactory precisions (relative standard deviation <9.9 %) and spiked recoveries (86.7 %–100.7 %) were obtained. The hydrophilic sDESP as a novel extractant has a good extraction efficiency for six hepatotoxic ingredients in traditional Chinese medicine “Psoraleae Fructus”. This method is a promising sample pre-treatment method owing to the advantages of dispersant free, low organic solvent consumption and simple operation.
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JOURNAL OF CHROMATOGRAPHY A
·
2025
·
IF 4
Mantang Chen,Linping Shi,Fuwei Xie,Xiaoyu Wang,Cong Nie,Sheng Wang,Kejian Liu,Jingjing Yu,Libin Wan
A flat membrane–based liquid-phase microextraction (FM-LPME) method was developed for the first time to simultaneously separate and extract basic and acidic pesticide analytes from the same sample. Using carbendazim and pirimicarb as representative basic pesticides, along with bromacil, diflubenzuron and 1,2-dibenzoyl-1-tert-butylhydrazine (RH-5849) as representative acidic pesticides, the performance of FM-LPME for the extraction of these model pesticides has been optimised individually. Under optimal extraction conditions, the developed FM-LPME-LC–MS/MS method exhibited excellent linearity, with R 2 values exceeding 0.9903 in concentration ranges of 0.1–1400 ng mL −1 for carbendazim and pirimicarb, and 1–1400 ng mL −1 for bromacil, diflubenzuron and RH-5849. The limits of detection ranged from 0.01 to 0.09 ng mL −1 . The recoveries and relative standard deviations of all the tested pesticides at three spiked concentrations (100, 500 and 1200 ng mL −1 ) were in the ranges of 80.0%–125.0% and 0.3%–9.3%, respectively. The FM-LPME-LC–MS/MS method demonstrated advantages in terms of being environmentally friendly, possessing a wide linear range, high sensitivity, high precision and satisfactory recoveries, thus highlighting its notable potential for the separation and extraction of basic and acidic pesticide residues in water samples.
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MACROMOLECULAR RAPID COMMUNICATIONS
·
2025
·
IF 4.3
Ming Yang,Ni Yao,Roman A. Surmenev,Xinxin Zhang,Jianyong Yu,Shichao Zhang,Bin Ding
Electrospun fibrous materials with fine fibers and small pores are fundamental for particulate matter (PM) filtration, addressing its harmful environmental and health impacts. However, the existing electrospun fibers are still limited to their sub-micron diameters and unstable surface electrostatic effect, leading to deteriorated filtration performance after prolonged storage or wetting. Herein, the study creates nanofibrous membranes with long-time stable electrostatics by electret-enhanced electrospinning. The phase separation and polarization of the charged jet are manipulated to achieve rapid stretch and strong electret. The obtained membrane exhibits nanosized structures with fiber diameters of ≈220 nm, pore size <1 µm, as well as robust surface potential of 0.4 kV. By virtue of the synergistic effects of sieving and adsorption, the nanofibrous membrane showed a remarkable PM 0.3 filtration efficiency of 96.6% and pressure drop of 140 Pa, even reaching the N90 standard after five wetting cycles. The design of such durable membranes will offer a new sight in the functional filtration materials.
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ANALYTICAL LETTERS
·
2024
·
IF 1.6
Yelu Wu,Weiyang Tang,Jian-Liang Zhou,Tian Xie
3,4-Dihydroxybenzaldehyde (DHB) is a highly effective water-soluble compound in the traditional Chinese medicine Salvia miltiorrhiza Bge. Which demonstrates clear therapeutic effects against a variety of diseases. Therefore, the development of a selective approach for the separation of 3,4-dihydroxybenzaldehyde is of great significance. In this study, electro-driven extraction combined with multi-stage extraction technology was employed for the first time to separate 3,4-dihydroxybenzaldehyde from S. miltiorrhiza Bge. Decoction (Recovery ≥ 46.09%). Five long-chain fatty alcohols were selected as the supported liquid membrane (SLM) in the electro-driven extraction. Factors influencing extraction efficiency, including pH, voltage, and extraction time, were optimized using a design of experiments. Under the optimal conditions, the linearity of 3,4-dihydroxybenzaldehyde ranged from 0.01 to 100 μg·mL−1), with limits of detection (LOD) and quantification (LOQ) of 5 and 17 ng·mL−1, respectively. The precision of electro-driven liquid membrane extraction for 3,4-dihydroxybenzaldehyde was below 8.42%. This paper reports novel electro-driven liquid membrane extraction for selectively isolating 3,4-dihydroxybenzaldehyde from S. miltiorrhiza Bge.
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