ANALYTICA CHIMICA ACTA
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2021
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IF 6.558
Jingtai Fu,Huasheng Lai,Zhuomin Zhang,Gongke Li
Recently, metal-organic frameworks (MOFs) based substrates have shown great potential for the quantitative analysis of food samples by surface-enhanced Raman scattering (SERS) due to their unique properties. Herein, we developed two UiO-66 MOFs/gold nanoparticles (AuNPs) based substrates by self-assembly, including UiO-66/AuNPs suspension substrate and UiO-66(NH 2 )/AuNPs/Nylon-66 flexible membrane substrate, for quantitative analysis of complex food samples by SERS. UiO-66/AuNPs suspension substrate was prepared for SERS-based determination of a carcinogenic heterocyclic amine in barbecue meat. UiO-66(NH 2 )/AuNPs/Nylon-66 membrane substrate was fabricated for the simultaneous separation, enrichment, and in situ analysis of Sudan Red 7B in chilli products. The heterocyclic amine and Sudan dye in real samples could be detected and quantified with the recoveries of 82.3–110% and 84.5–114% and relative standard deviations (RSDs) of 3.1–11.0% and 1.9–5.6% (n = 3) by use of these two substrates, respectively. These two UiO-66/AuNPs based substrates combined molecular enrichment and SERS activity, achieving excellent analytical accuracy and widening SERS application in practical food safety analysis.
研究领域:
分析化学
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食品安全
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纳米材料科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2025
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IF 7.7
Rui Wang,Yimin Tang,Yanan Lu,Zhiyu Wang,Xin Jiang,Bing Zhao,Libin Yang
Constructing a heterogeneous structure with the combined contribution of electromagnetic (EM) and chemical (CM) mechanisms, while enabling all components to contribute to each mechanism, is an effective strategy for developing new high-performance surface-enhanced Raman scattering (SERS) substrate. In this work, a novel 3D/1D MoS 2 flower-like microspheres@Au nanowires (MoS 2 FMs@Au NWs) heterojunction SERS matrix platform is successfully developed through morphology regulating and interface engineering strategies. The enhancement factor of SERS matrix is as high as 3.97 × 10 9 . The theoretical simulations and experiments reveal the combined contribution of EM and CM mechanisms. The dual EM effects (Mie resonance triggered by 3D MoS 2 FMs and hotspot effect of high-density Au NWs customized by highly ordered MoS 2 ) and the multidimensional CM contributions (high-efficiency carrier separation of MoS 2 triggered by heterostructure and high carrier utilization rate from hot electron excitation of Au NWs) can be synchronously achieved for boosting SERS activity of the heterojunction. More meaningfully, the developed SERS matrix can realize an ultra-sensitive detection for trace fungicide residues (crystal violet and malachite green) in real water system. This discovery provides new insights and perspectives for developing novel function-customized SERS substrates, aiming to advance the practical application of SERS technology.
研究领域:
材料科学
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纳米技术
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分析化学
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表面科学
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传感器与生物传感器
✓ 已验证
产品关联
DOI
高影响因子
POSTHARVEST BIOLOGY AND TECHNOLOGY
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2025
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IF 6.8
Hua Huang,Genlin Mao,Dongjie Liu,Shenghua Ding
The cuticle layer covering on surface plays important roles in the quality changes including visual of appearance, texture, and water loss for fruit. The surface microstructures, chemical composition of epi- and intracuticular waxes, and cutin monomers, as well as their effects on fruit transpiration in Sanhua plum were comprehensively carried out. Microscopic observation revealed an irregular surface morphology characterized by continuous crusts interspersed with sparsely distributed nano-granular crystals. Chemical analysis demonstrated that the epicuticular waxes were primarily composed of very-long-chain n -alkanes, secondary alcohols, aldehydes, fatty acids, primary alcohols, and alkyl esters. The intracuticular waxes contained comparable levels of very-long-chain components and pentacyclic triterpenoids. The cutin monomers were predominantly C 16 -dihydroxy fatty acids, and other hydroxyl fatty acid derivatives, present with a moderate level as other reported Rosaceae family fruit. Compared to cutin polymers, the cuticular waxes contributed approximately 76.9 % of the total barrier to water loss, with the epicuticular wax layer exhibiting 1.6-fold to the intracuticular wax layer for the barrier efficiency in Sanhua plum fruit. The elucidation of the potential effect of surface lipids on transpiration was likely associated with the structural and chemical distribution of cuticular wax layers within the cuticle.
✓ 已验证
产品关联
DOI
高影响因子
POSTHARVEST BIOLOGY AND TECHNOLOGY
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2024
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IF 6.4
Hua Huang,Xuemei He,Qingming Sun,Guoming Liu,Yayuan Tang,Jian Sun
Pitaya ( Hylocereus undatus ) fruit is susceptible to pathogens that induce fruit decay after harvest. Cuticular waxes covering the outermost plant surfaces are the first site of plant-environment interactions; however, their changes in response to fruit decay are under-researched. Herein, the surface microstructures and chemical composition of wax on pitayas, as well as their changes in response to fruit decay, were comparatively studied. The varieties ‘Baishuijing’ (BSJ) and ‘Hongshuijing’ (HSJ) were examined after harvest. The fruit appearance, morphology, and wax composition differed between cultivars. The surface of both pitaya cultivars was smooth, although traces of granules and a thicker lipid layer were observed using histochemical staining in HSJ than in BSJ, as well as a higher cuticular wax content. Fruit decay rate increased rapidly in both cultivars under room storage conditions, and greater sensitivity to pathogens was found in BSJ than HSJ. As well as the occurrence of fruit decay, the total wax coverage, very-long-chain primary alcohols, aldehydes, fatty acids, and triterpenoids decreased in BSJ, while remaining relatively stable in HSJ. Correspondingly, the relative gene expression levels of HuKCS11 (−1, 2, and 3) , HuKCS17 , and HuKCS19 (for the elongation of very-long-chain fatty acids), HuCER1 (for aldehydes or n -alkanes), HuFAR (−1 and 2) (for primary alcohols), HuBAS1 (−1, 3, and 4) (for β-amyrin), and HuLUS1 (for lupeol) were considerably modified following fruit senescence during storage. The difference in surface topography and wax accumulation between cultivars might have affected pathogen susceptibility after harvest. These results may help when choosing varieties of pitaya based on surface characteristics and cuticular chemicals. They may also help to optimize strategies for postharvest preservation and storage.
研究领域:
植物科学
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农学
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采后生理学
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分子生物学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Shaobo Zhang,Shulei Pang,Li Jiang,Dan Zhao,Yan Yuan,Yi Li,Yanmao Dong
To solve the increasingly serious wastewater problems, developing membranes with excellent filtration performance and anti-fouling property has been a research focus. Herein, hydrophilic tannic acid/cysteine/tyrosine@titanium (TA/Cys/Tyr@Ti) double crosslinked coating was constructed on the poly (vinylidene fluoride) (PVDF) microfiltration membranes by two-step coating method, while the mineralized titanium dioxide (TiO 2 ) nanoparticles were utilized to produce superhydrophilic membranes. The synergistic effect of the multilayered nanostructure and hydrophilic groups enables excellent underwater superoleophobicity and anti-fouling property of modified membranes. The addition of TiO 2 provides photocatalytic degradation and self-cleaning properties. The optimized modified membrane (MF-4) showed outstanding oil–water separation potential (emulsion flux of 2760 ± 30 L·m −2 ·h −1 , oil rejection rate of 99.5 ± 0.3 %) and stable recycling filter capacity. Moreover, MF-4 was able to efficiently degrade methylene blue under UV light, which was 99.1 % at 90 min. The flux recovery rate (FRR) was 97.4 % following simulated contamination and regeneration with bovine serum albumin. After UV irradiation, the FRR appeared to be significantly enhanced, proving its great anti-fouling and self-cleaning properties. This modified membranes with superhydrophilic and self-cleaning properties have great application potential in oily wastewater and achieving automatic operation of wastewater treatment.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
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2020
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IF 4.049
Peng Li,Dongting Huang,Junsheng Huang,Jingjie Tang,Pingjun Zhang,Fei Meng
A novel kind of magnetic porous carbon nano-fibers (Fe 3 O 4 @P-CNFs) materials was successfully prepared and used as an adsorbent. Based on the above-mentioned adsorbent, a simple and effective magnetic disperse solid-phase extraction (MSPE) method was developed and first utilized to the enrichment and purification of five Sudan dyes (including Sudan I, Sudan II, Sudan III, Sudan IV, and Sudan Red 7B) in foodstuffs for the first time. High-performance liquid chromatography was used to determine the content of the Sudan dyes. The parameters affecting the extraction performance were studied and optimized, including the amount of the adsorbent and inorganic salt, type and the volume of the eluent, pH of the sample solution and extraction time. Under the optimized experimental conditions, the results show that the proposed method has a good linear relationship (r≥ 0.9993). The limits of detection range from 0.88 μg L −1 to 1.27 μg L −1 . The recoveries range from 86.6% to 99.7% with the relative standard deviations ranging from 0.6% to 7.9% in the methodology validation. The above-mentioned results indicate that the proposed method is a sensitive and reliable procedure with good reproducibility for the detection of Sudan dyes residues in foodstuffs.
研究领域:
材料科学
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分析化学
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食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
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2016
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IF 4.035
Wenhua Ji,Mingming Zhang,Tao Wang,Xiao Wang,Zhenjia Zheng,Junjie Gong
In this research, the successfully developed molecularly imprinted solid-phase extraction (MISPE) method based on SH-Au modified silica gel for Sudan dyes determination has been described. Gold nanoparticles (Au NPs) were organized onto the surface of silica gel through the covalent binding between sulfydryl and Au. Subsequently, molecularly imprinted polymers (MIPs) were prepared via the graft polymerization using Au NPs as the functional monomer . The composition and morphology of MIPs were characterized by X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and thermogravimetric analysis (TG). Binding property was systematically evaluated through adsorption isotherm , adsorption kinetics , and selective recognition capacity. MISPE pretreatment was successfully established after optimizing various parameters. Under optimized conditions, good linearity for six investigated Sudan dyes was ranged from 0.005 to 10.0 μg g −1 (R 2 >0.999) with low limits of detection and quantification (1.5–4.7 and 5.2–15.5 ng g −1 , respectively). The recoveries at three different spiked levels (0.05, 0.5, and 2.0 μg g −1 of each Sudan dye) were ranged from 87.2% to 94.7% with RSD below 6.1% (n=3). The results demonstrated one reliable, sensitive and accurate MISPE pretreatment technique with excellent reproducibility for the determination of six Sudan dyes in chili powder samples.
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
JOURNAL OF CHROMATOGRAPHY A
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2015
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IF 4.169
Chengjiang Zhang,Gongke Li,Zhuomin Zhang
Covalent organic polymers (COPs) connected by covalent bonds are a new class of porous network materials with large surface area and potential superiority in sample pretreatment. In this study, a new hydrazone linked covalent organic polymer (HL-COP) adsorbent was well-designed and synthesized based on a simple Schiff-base reaction. The condensation of 1,4-phthalaldehyde and 1,3,5-benzenetricarbohydrazide as organic building blocks led to the synthesis of HL-COP with uniform particle size and good adsorption performance. This HL-COP adsorbent with high hydrophobic property and rich stacking π electrons contained abundant phenyl rings and imine ( C N) groups throughout the entire molecular framework. The adsorption mechanism was explored and discussed based on π–π affinity, hydrophobic effect, hydrogen bonding and electron–donor–acceptor (EDA) interaction, which contributed to its strong recognition affinity to target compounds. Enrichment factors were 305–757 for six Sudan dyes by HL-COP micro-solid phase extraction (μ-SPE), indicating its remarkable preconcentration ability. Furthermore, the adsorption amounts by HL-COP μ-SPE were 1.0–11.0 folds as those by three commonly used commercial adsorbents. Then, HL-COP was applied as adsorbent of online μ-SPE coupled with high performance liquid chromatography (HPLC) for enrichment and analysis of trace Sudan dyes in food samples with detection limit of 0.03–0.15 μg/L. The method was successfully applied for online analysis of chilli powder and sausage samples. Sudan II and Sudan III in one positive chilli powder sample were actually found and determined with concentrations of 8.3 and 6.8 μg/kg, respectively. The recoveries of chilli powder and sausage samples were in range of 75.8–108.2% and 73.8–112.6% with relative standard deviations of 1.2–8.5% and 1.9–9.4% ( n = 5), respectively. The proposed method was accurate, reliable and convenient for the online simultaneous analysis of trace Sudan dyes in food samples.
研究领域:
分析化学
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食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
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2021
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IF 4.821
Ming-Yue Dong,Hai-Long Wu,Wan-Jun Long,Tong Wang,Ru-Qin Yu
Edible colorants, as an essential external condition of food products, can increase people’s appetite. Some businesses have used some cheap and illegal dyes instead of edible colorants to gain benefits. It not only deceives consumers, but also seriously endangers their health. In this work, two chemometric algorithms assisted high-performance liquid chromatography with diode array detection (HPLC-DAD) were proposed for screening and quantifying twelve azo dyes illegally added into different food products. All analytes were successfully eluted within 6.5 min. With the aid of the prominent “second-order advantage” of the chemometric algorithms, the overlapping peaks and unknown interferences were solved. The spiked average recoveries obtained by alternating trilinear decomposition (ATLD) and multivariate curve resolution-alternating least squares (MCR-ALS) were 82.8–111.5% with standard deviation (SD) less than 6.5% and 78.7–122.6% with SD less than 18.7%, respectively. The limits of detection were 0.01–2.56 mg kg −1 and 0.01–2.95 mg kg −1 , respectively. The results indicated that two algorithms had practical value for the simultaneous and rapid screening and determination of azo dyes in food products. Compared with other methods based on HPLC, the proposed method could flexibly handle different interferences, and had the advantages of high efficiency, simple operation and being environmentally friendly.
研究领域:
分析化学
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食品科学
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化学计量学
✓ 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）