Current Research in Food Science
·
2024
·
IF 6.2
Huan Gong,Lijia Chen,Guangyi Kan,Wenjie Zhang,Qiqi Qian,Xichang Wang,Jian Zhong
In this work, three types of benzenedialdehydes (1,2-, 1,3-, and 1,4-BDAs) were used to prepare BDA-crosslinked gelatin nanoparticles and the 1,2-BDA-crosslinked gelatin nanoparticle was explored to stabilize fish oil-loaded Pickering emulsions. The nanoparticle preparation was dependent on both pH and crosslinker types. 1,2-BDA and preparation pH of 12.0 induced the most nanoparticle amounts among the three BDAs and a pH range of 3.0–12.0. The crosslinked gelatin nanoparticles (10-nm scale) could aggregate to form larger nanoparticles (hundred-nanometer scale) in the water. The BDA crosslinking induced lower emulsifying properties (EAI: 10.2 ± 0.3 m 2 /g; ESI: 69.7 ± 3.6 min) for gelatin nanoparticles than gelatin (EAI: 30.9 ± 0.6 m 2 /g; ESI: 267.8 ± 2.0 min). With the increase of the gelatin nanoparticle concentrations (5–40 g/L), the emulsion viscosity increased (163 ± 9–422 ± 3 mPa s at the rotary speed of 60 rpm), the interfacial tension decreased (10.3 ± 0.2–7.2 ± 0.2 mN/m), and the creaming indexes decreased (42.1% ± 0.7%–13.3% ± 0.8% at day 21). The higher sodium chloride concentration (0.0–0.8 mol/L) induced the lower emulsion stability, even obvious phase separation (0.8 mol/L of NaCl). Therefore, the sodium chloride addition should be carefully considered for the development of emulsion-based foods. This work provided useful information for the development and application of protein nanoparticles.
研究领域:
食品科学
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材料科学
·
界面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Analytical Methods in Chemistry
·
2014
·
IF 0.948
Hongzhi Hu,Ying Liang,Shuo Li,Qing Guo,Chancui Wu
In the existence of appropriate amount of disodium ethylenediaminetetraacetate (EDTA), precipitation would not occur in seawater and other natural waters even if the sample solution was adjusted to strong basicity, and the NH3-OPA-sulfite reaction at the optimal pH range could be used to determine ammonium in natural waters. Based on this, a modified o-phthalaldehyde fluorometric analytical method has been established to determine ultratrace ammonium in natural waters. Experimental parameters, including reagent concentration, pH, reaction time, and effect of EDTA, were optimized throughout the experiments based on univariate experimental design. The results showed that the optimal pH range was between 10.80 and 11.70. EDTA did not obviously affect the fluorometric intensity. The linearity range of the proposed method was 0.032–0.500 µmol/L, 0.250–3.00 µmol/L, and 1.00–20.0 µmol/L at the excitation/emission slit of 3 nm/5 nm, 3 nm/3 nm, and 1.5 nm/1.5 nm, respectively. The method detection limit was 0.0099 µmol/L. Compared to the classical OPA method, the proposed method had the advantage of being more sensitive and could quantify ultratrace ammonium without enrichment.
研究领域:
环境科学
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分析化学
✓ 已验证
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Wanlin Xue,Shihai Cao,Rui Liu,Rong Tang,Huan Chen,Fang Jiang
Nitrogen-containing carbon materials (NCC- x ) are promising metal-free catalysts for activation of peroxymonosulfate (PMS) to treat with aqueous organic pollutants . In this study, NCC- x were synthesized via a facile thermal polymerization method using urea and terephthalaldehyde as precursors. This method was derived from the polymerization method of graphitic carbon nitride (g-C 3 N 4 ) and the reaction between the precursors was based on Schiff base chemistry. Compared with the synthesis of g-C 3 N 4 using urea as the precursor, formation of a melamine ring was inhibited and the cyano groups were produced in NCC- x during the polymerization process. The obtained NCC- x catalysts had high specific surface areas, many graphite-nitrogen active sites, and high degrees of graphitization , thus exhibiting excellent activities for the degradation of bisphenol A via PMS activation . This study introduces a convenient method to obtain a highly efficient nitrogen-containing carbon PMS activator and the results are useful for the development of bisphenol A treatment by PMS activation using carbon-containing materials.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Yongbin Zhang,Yongfei Huang,Yongkang Yue,Jianbin Chao,Fangjun Huo,Caixia Yin
Because of the high toxicity of hydrazine, the development of ultrasensitive fluorescent probes for hydrazine has been challenging. In this work, an ultrasensitive fluorescent probe based on o -phthalaldehyde has been exploited for hydrazine. The probe was designed based on creating an efficient fluorophore by incorporating hydrazine into o -phthalaldehyde framework via an intermolecular condensation-cyclization reaction. The probe could quickly detect hydrazine and displayed a high sensitivity for hydrazine with a LOD of 1.9 nM (0.06 ppb), which is far below the U.S. Environmental Protection Agency standard (10 ppb). Moreover, the probe was successfully applied to the detection of hydrazine in real water samples and hydrazine vapor.
研究领域:
分析化学
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环境监测
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生物传感
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分子探针
·
毒理学
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Zhishun Jie,Jia Liu,Ye Ying,Haifeng Yang
High plasma homocysteine (Hcy) levels may indicate cardiovascular disease. However, sensitive and selective determination of Hcy remains a major challenge. Herein, we present a sensing strategy for Hcy by surface enhanced Raman scattering (SERS) method along with a specific reaction of o-phthalaldehyde (OPA) and Hcy. The obtained adduct 2-(1-carboxyl-3-thiopropyl)-1-isoindolinone (Hcy-OPA) can be directly detected by SERS using gold nanoparticles (Au NPs) as the substrate. The developed SERS method displays superior sensitivity (low detection limit of 2.50 × 10 −12 mol L −1 ) with a broad linear range (5.00 × 10 −10 −5.00 × 10 −6 mol L −1 ). As a proof of real application, it can be used to detect Hcy in bovine serum samples with a concentration as low as 5.00 × 10 −9 mol L −1 , which is free from the interference of the other amino acids and glutathione.
研究领域:
医学诊断
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分析化学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2025
·
IF 4.6
Yaohong Gu,Qianqian Pang,Zhiting Deng,Zhichao Chen,Yaling Yang
Herein, a novel fluorometric approach is developed for the precise quantification of nicotine. This method utilized the derivatizing reaction between o-phthalaldehyde (OPA) and reduced glutathione (GSH), and derivatized product with tricyclic conjugated structure generate fluorescent emission. And the derivative exhibits a quantum yield of 33.46 % and distinct fluorescence “turn-off” quenching behavior in the presence of Cu 2+ ions due to the GSH-Cu 2+ complex formation. More importantly, when nicotine is introduced reaction system, the fluorescence restored (“turn-on”) based on the nicotine-Cu 2+ complex formation. Therefore, a fluorimetric sensor for nicotine detection is developed with lower detection limit (LOD) of 0.21 μg/mL. The developed method was successfully utilized to analyze nicotine content in electronic cigarette and cigarette bag samples, yielding satisfactory recovery rates ranging from 85.2 % to 111.8 %. The obtained results demonstrated comparable accuracy and confirmed the method's reliability and practical applicability.
研究领域:
分析化学
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生物传感
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药物代谢
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环境毒理学
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分子诊断
·
转化医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Xiaowei Mu,Jing Zhan,Xiaming Feng,Bihe Yuan,Shuilai Qiu,Lei Song,Yuan Hu
Covalent organic frameworks (COFs) nanosheets prepared from condensation reaction between melamine and o-phthalaldehyde are first prepared through ball milling and then incorporated into thermoplastic polyurethanes (TPU) by solution mixing. Transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared (FTIR) spectrometer are applied to characterize COFs nanosheets. It is observed apparently from TEM image that COFs nanosheets are obtained. Successful preparation of COFs nanosheets is proved further by vanishment of typical diffraction peak of COFs at around 23.5° in COFs nanosheets XRD pattern, appearance of quadrant and semicircle stretching of the s-triazine ring at 1568 and 1469 cm–1 in FTIR spectra and N═C bond at 389.5 eV in N1s high-resolution XPS spectra of COFs nanosheets. The thermal property, combustion behavior and mechanical performance of TPU naoncomposites are also investigated. Incorporation of COFs nanosheets into TPU contributes to char forming of TPU under nitrogen atmosphere and 14.3% decrease of peak heat release rate of TPU. Besides, the elongation at break, Young’s modulus, and fracture strength of TPU nanocomposites increase sharply compared with that of neat one.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Min Zhang,Tao Zhang,Ying Liang,Yingming Pan
A new fluorescent reagent, 4,5-dimethoxyphthalaldehyde (M 2 OPA) is synthesized for the determination of ammonium in environmental waters. M 2 OPA has a similar molecular structure as o-phthalaldehyde (OPA), a commonly used fluorescent probe for ammonium, but M 2 OPA has two methoxy groups joining the benzene ring of OPA. Ammonium is reacted with M 2 OPA and sulfite to form a fluorescent derivative, which has a maximum of excitation (λ ex ) and emission (λ em ) located at 380 and 485 nm, while the λ ex and λ em of OPA reaction are 360 and 430 nm. The M 2 OPA assay has a rapid reaction and enhanced fluorescent intensity, compared with the OPA-based assay. To realize the ammonium detection in field, a hand-held portable laser diode (LD) fluorometer is developed as the detector for the M 2 OPA assay. Two LDs of 405 nm in parallel are used as the light source, allowing the detector to operate in single- and dual-laser beam modes. This allows for different linear ranges (0–5 and 0–2 μM, respectively). A photomultiplier tube is used for emission light detection. Limits of detection of 6.5 and 3.5 nM are obtained by using single- and dual-laser beam modes, respectively.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 10
·1766
·
IF 5.719
Qiong Jiang,Shuwu Zhang,Juanjuan Feng,Min Sun
To improve the extraction performance of the silica aerogel, a melamine-terephthalaldehyde polymer was used to hybridize silica aerogel, and the hybridized aerogel was coated on the surface of stainless steel wire to prepare a fiber-filled extraction tube through placing four wires into a polyetheretherketone tube. The tube was combined with high-performance liquid chromatography, then the online extraction and detection were established. Several polycyclic aromatic hydrocarbons (PAHs) were selected as the target analytes. Under the optimum extraction and desorption conditions, the limit of detection was as low as 3.0 ng L−1, and the linear range was 0.01–20.0 μg L−1. The enrichment factors of PAHs were in the range of 1724–2393. Three environmental water samples of mineral water, tap water and river water were analyzed by this method, and the recoveries that spiked at 1.0–10.0 μg L−1were between 80.5–126%. It showed many advantages compared with other methods, such as better sensitivity, faster detection and online analysis.Keywords:solid-phase microextraction;silica aerogel;melamine-terephthalaldehyde polymer;polycyclic aromatic hydrocarbons;online analysis
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Xiaotong Wang,Qingling Zhao,Qinghong Song,He Bu,Jie Gao,Lanlan Li,Xiaofei Yu,Xiaojing Yang,Zunming Lu,Xinghua Zhang
Carbon dots (CDs) possess the merits such as energy efficiency, green sustainability and environmental friendliness, comparing with top-down synthesis methods at higher pressure or temperature condition. Here, a variety of emission states CDs were prepared by using the method of room temperature chemistry by selecting green raw materials such as glucose, p-phthalaldehyde and m-diethylaminophenol. The luminescence mechanism was studied in detail. The luminescent center of blue emitting carbon dots (B-CDs) and green emitting carbon dots (G-CDs) is C O bond, and the increased contents of C O bond lead to the creation of new energy levels between the energy gaps of HOMO and LUMO levels, which results in the red shift of luminescence wavelength. The emission state of red emitting carbon dots (R-CDs) is due to the formation of amino N. In addition, R-CDs have an exclusive respond to dopamine (DA) and are regarded as good fluorescent probes for detecting DA. Furthermore, the addition of ascorbic acid (AA) restores the luminescence of R-CDs quenched by DA. Therefore, R-CDs has great application potential as a selective fluorescent “turn on-off” probe.
研究领域:
化学
·
生物分析
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2018
·
IF 4.946
Xuan Qi,Wei-Feng Wang,Jun Wang,Jun-Li Yang,Yan-Ping Shi
A highly selective colorimetric detection method for putrescine on the basis of an optimized derivatization reaction was established. With the aids of o -phthalaldehyde (OPA) and thioglycolic acid (TGA), putrescine was derived to become red derivatives (PUT-RD), the form that can be detected qualitatively and quantitatively by visual inspection and UV-vis spectrophotometer at λ max of 490 nm, respectively. Key parameters affecting the experiment were investigated by one-factor-at-a-time and response surface analysis. At the optimal condition, this colorimetric method achieved good linearity at putrescine concentrations ranging from 0.8 to 200 μM with detection limit of 0.44 µM. The method also has good selectivity when common amino acids and inorganic ions, as well as ethylenediamine, 1,3-propanediamine, 1,5-pentanediamine, and 1,6-hexanediamine were used as interferences. The established colorimetric method was successfully employed for the detection of putrescine in 10 commercial fish products.
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
MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Yang Xue,Xiangxin Meng,Bixiu Yuan,Huifang Xu
Fabrication of polymer porous xerogel with environment-friendly and simplified procedure is important target for reducing pollution and production cost. In this research, a sustainable method to prepare thermal insulator of polysiloxane-phenolic composite porous xerogel monoliths was studied by replacing hazardous and volatile formaldehyde with terephthalaldehyde in phenolic component and applying facile ambient drying process. The homogeneous dispersion of poly(methylphenylsiloxane) and resorcinol-terephthalaldehyde in xerogels was achieved by adjusting catalysis condition, water-ethanol content and prepolymer component. Typical poly(methylphenylsiloxane) and resorcinol-terephthalaldehyde composite xerogel monolith had density of about 0.3 g/cm 3 , 65.4% mass retention rate at 800 °C under nitrogen atmosphere, and thermal conductivity 0.063 W/(m·K) at room temperature. According to Thermogravity analysis coupled with Fourier Transform Infrared Spectra (TG-FTIR), pyrolysis mechanism and structure transformation were revealed. The typical pyrolyzed derivatives at 600 °C and 800 °C well preserved the integrated structure, low density, thermal insulation property, and thermal oxidation stability.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 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）