JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2024
·
IF 4
Caiyun Liu,Siye Gao,Jialin Ma,Yongliang Lu,Mario Prejanò,Yunkui Li
Increasing consumer demand for high-quality wines required the introduction of more comprehensive monitoring indicators for quality management, necessitating winemakers to strive for rapid, real-time, and affordable monitoring tools during winemaking. This study investigated the feasibility of cost-efficient and easy-to-implement ultraviolet-visible (UV-Vis) spectroscopy combined with chemometric methods to predictively monitor the evolution of wine color and phenolics throughout commercial fermentation. Fermentations on a winery scale were carried out with a daily analysis of the UV-Vis spectra, color, and phenolics. Furthermore, characteristic wavelengths were established by a self-compiled Python program to reduce redundancy in spectra. The optimized partial least squares (PLS) model predicted well with a residual prediction deviation (RPD) greater than 2.54, and the robustness was further verified by a robust external Bland-Altman method. UV-Vis spectroscopy can achieve objective monitoring of the practical fermentation profile, which can better help winemakers make decisions to improve wine quality and consistency.
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高影响因子
ACS Sustainable Chemistry & Engineering
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2017
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IF 5.951
Qingyong Tian,Weijing Yao,Wei Wu,Jun Liu,Zhaohui Wu,Li Liu,Zhigao Dai,Changzhong Jiang
Efficiently reclaiming the utilization of solar light in a photocatalysis system remains very challenging. By integrating full advantage of upconversion material, plasmonic metals, and narrow bandgap semiconductors, β-NaYF4:18%Yb3+ and 2%Tm3+@SnO2@Ag nanoparticles (denoted as NaYF4@SnO2@Ag NPs) are designed and successfully synthesized as a wide-spectral (UV–vis-NIR) responsive upconversion and plasmonic-enhanced photocatalyst. The as-obtained NaYF4@SnO2@Ag NPs present broadband optical absorption dimension, excellent photocatalytic efficiency, and good stability for the degradation of organic dyes. The enhanced photocatalytic performance of NaYF4@SnO2@Ag NPs can be attributed to the synergistic effects of the components composed in this core/shell architecture that result in higher photocarriers yield and favor the efficient transfer of photocarriers and energy. This work gives insight to guidance of fabricating efficient, multicomponent upconversion catalysts and proposes a potential in the field of high-efficiency environmental and energy-related applications.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2020
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IF 3.232
Tarun Kumar Patle,Kamlesh Shrivas,Ramsingh Kurrey,Seema Upadhyay,Rajendra Jangde,Ravishankar Chauhan
Here, we report an ultrasonic-assisted extraction (UAE) of phytochemicals from bark, leaves, sepals, fruits, and seeds of Dillenia pentagyna (Roxb) using different organic solvents such as chloroform, ethanol, and n-hexane. The preliminary phytochemical screening results showed that the ethanolic extract is enriched with phenolics, flavonoids , tannin , saponin , alkaloid, and terpenoids . The profiling of phytochemicals is carried out employing UV–Vis and Fourier-transform infrared (FTIR) spectroscopy analyses. The higher amount of phenolic compounds obtained in the ethanolic extract of bark and leaves as compared to other parts of the plant. Consequently, a higher amount of total flavonoid compounds unveiled in the bark of targeted species. The ethanolic extract of bark and leaves showed good free radical scavenging activity using DPPH with inhibition percentage of 90.58 ± 1.89% and 76.46 ± 1.58%, respectively, in comparison to standard ascorbic acid at 10 μg/mL. Moreover, the half-maximal inhibitory concentration (IC 50 ) value of bark and leaves are 5.64 and 6.54 μg/mL, respectively, in comparison to standard ascorbic acid . With the best of our knowledge, it is the first report pertaining to characterization and quantification of phenols and flavonoids as well as the investigation of the medicinal property in D. pentagyna .
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PubMed
高影响因子
Advanced Optical Materials
·
2026
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IF 7.2
Jiajing Zhang,Junan Fang,Yaqin Han,Xiaohui Zhu,Qianxi Fan,Jia An,Tingting Xu,Yufei Liu
Accurate trace-moisture detection in organic solvents is crucial for numerous industrial and scientific applications, yet conventional fluorescence sensors often suffer from poor accuracy due to their dependence on environmentally sensitive intensity signals. Herein, we report a wavelength-shifted fluorescence and colorimetric dual-mode sensing strategy, in which moisture variations are reflected by synchronized wavelength shifts of emission and absorption maxima. This strategy employs a novel fluorescent probe, termed λ-probe , whose excited-state behavior is regulated by water-mediated hydrogen bonding. Specifically, as the moisture content increases, both the emission and absorption spectra of the λ-probe exhibit a progressive blue shift, with a shift magnitude of approximately 80 nm. Both emission and absorption peak wavelengths exhibit piecewise-linear relationships with moisture content, enabling dual peak-position quantification over a broad range of 0%–90%. Furthermore, a smartphone-based fluorescence-colorimetric dual-mode sensing platform was developed to achieve rapid on-site quantitative detection. The a* value extracted from fluorescence and colorimetric images using a custom MATLAB program both show linear correlations with moisture content, achieving limit of detections (LODs) of 0.97% and 0.20%, respectively. This work establishes a dual peak-position sensing strategy and provides a smartphone-assisted platform for rapid on-site moisture quantification in highly polar aprotic solvents.
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高影响因子
FOOD RESEARCH INTERNATIONAL
·
2026
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IF 8
Xuejing Liu,Zhaojun Zheng,Yuanfa Liu
A novel method for determining α, β-unsaturated aldehydes (α, β-UAs) in edible oils was proposed, utilizing 2,4-dimethylpyrrole (2,4-DMP) derivatization followed by UV–vis analysis. The optimal detection wavelengths were identified as 580 nm for α, β-monounsaturated aldehydes (α, β-MUAs) and 680 nm for α, β-diunsaturated aldehydes (α, β-DUAs). The reaction mechanism was confirmed by Fukui function and hydrogen nuclear magnetic resonance ( 1 H NMR) analysis, demonstrating formation of enamine as the final product. Derivatization conditions were optimized for rapid and reproducible results. The proposed method demonstrated excellent sensitivity, with limits of detection (LOD) and quantification (LOQ) for α, β-MUAs at 0.0038 μmol/mL and 0.0117 μmol/mL, and for α, β-DUAs at 0.0043 μmol/mL and 0.0129 μmol/mL, respectively. Compared to the p-anisidine value ( p-AV ) and high-performance liquid chromatography (HPLC) based methods, the proposed method showed several advantages in shorter derivatization time, simplified operation, high throughput potential and lower toxicity. This method provides an efficient tool for α, β-UAs detection, which is crucial for ensuring oil quality and safety.
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PubMed
高影响因子
BIOELECTROCHEMISTRY
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2013
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IF 3.947
Ying Zhang,Xuejing Wang,Lei Wang,Miao Yu,Xiaojun Han
The baicalin and baicalein are the major flavonoids found in Radix Scutellariae , an essential herb in traditional Chinese medicine for thousands of years. The interactions of the baicalin and baicalein with lipid bilayer membranes were studied using cyclic voltammetry and UV–Vis spectroscopy. The thickness d of supported bilayer lipid membranes was calculated as d = 4.59(± 0.36) nm using AC impedance spectroscopy . The baicalein interacted with egg PC bilayer membranes in a dose-dependent manner. The responses of K 3 Fe(CN) 6 on lipid bilayer membrane modified Pt electrode linearly increased in a concentration range of baicalein from 6.25 μM to 25 μM with a detection limit of 0.1 μM and current-concentration sensitivity of 0.11(± 0.01) μA/μM, and then reached a plateau from 25 μM to 50 μM. However the baicalin showed much weaker interactions with egg PC bilayer membranes. UV–Vis spectroscopy also confirmed that the baicalein could interact with egg PC membranes noticeably, but the interaction of baicalin with membranes was hard to be detected. The results provide useful information on understanding the mechanism of action of Radix Scutellariae in vivo.
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高影响因子
ACS Applied Materials & Interfaces
·
2024
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IF 8.3
Xiaolong Li,Jundi Wan,Yulu Tang,Chenyu Wang,Yahui Zhang,Dongjun Lv,Mingyuan Guo,Yongning Ma,Yuhao Yang
Navigating more effective methods to enhance the photon utilization of photodetectors poses a significant challenge. This study initially investigates the impact of morphological alterations in 2H-MoS2 on photodetector (PD) performance. The results reveal that compared to layered MoS2 (MoS2 NLs), MoS2 nanotubes (MoS2 NTs) impart a cavity enhancement effect through multiple light reflections. This structural feature significantly enhances the photodetection performance of the MoS2-based PDs. We further employ the heterojunction strategy to construct Y-TiOPc NPs:MoS2 NTs, utilizing Y-TiOPc NPs (Y-type titanylphthalocyanine) as the vis–NIR photosensitizer and MoS2 NTs as the photon absorption enhancer. This approach not only addresses the weak absorption of MoS2 NTs in the near-infrared region but also enhances carrier generation, separation, and transport efficiency. Additionally, the band bending phenomenon induced by trapped-electrons at the interface between ITO and the photoactive layer significantly enhances the hole tunneling injection capability from the external circuit. By leveraging the synergistic effects of the aforementioned strategies, the PD based on Y-TiOPc NPs:MoS2 NTs (Y:MT-PD) exhibits superior photodetection performance in the wavelength range of 365–940 nm compared to MoS2 NLs-based PD and MoS2 NTs-based PD. Particularly noteworthy are the peak values of key metrics for Y:MT-PD, such as EQE, R, and D* that are 4947.6%, 20588 mA/W, and 1.94 × 1012 Jones, respectively. The multiperiod time-resolved photocurrent response curves of Y:MT-PD also surpass those of the other two PDs, displaying rapid, stable, and reproducible responses across all wavelengths. This study provides valuable insights for the further development of photoactive materials with a high photon utilization efficiency.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
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IF 8.025
Lan Chen,Xiaoxiao Wei,Huan Wang,Min Yao,Liming Zhang,Göran Gellerstedt,Mikeal E. Lindström,Monica Ek,Shuangfei Wang,Douyong Min
An ionization difference UV–Vis method ( Δε -spectrum method) is the most potentially simple method for fast quantitation of phenolic hydroxyl groups (ph-OH) in lignin. However, the underestimated results were calculated from the conventional Δε -spectrum method using one- or two-point wavelengths measurement. In this study, a modified Δε -spectrum method using multi-point wavelengths measurement was developed and the negative absorbance was also considered. Four main typical lignin models, e . g . vanilla alcohol, 5-5 biphenyl , stilbenoid and vanillin , were applied as the guaiacyl-type (G-type) phenolic models for the determination of ph-OH by the modified Δε -spectrum method. The 2-methoxyethanol/water/acetic acid = 8/2/0.2 ( V /V/V) was used as the acidic solvent system and the 2-methoxyethanol/0.2 M NaOH solution = 1/9 ( V /V) was used as the alkaline solvent system. The ph-OH contents in the spruce milled wood lignin (SMWL) and the spruce Kraft lignin (SKL) were respectively quantified by the modified Δε -spectrum method as 1.078 and 4.348 mmol/g, which were comparable to the counterparts determined by 31 P Nuclear Magnetic Resonance Spectroscopy ( 31 P NMR). The results revealed that the modified Δε -spectrum method can provide more accurate and reliable results compared to the conventional method.
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Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 16
·7194-7205
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IF 9.931
Lan Lan,Zhengkang Shi,Qian Zhang,Yuanzhi Li,Yi Yang,Shaowen Wu,Xiujian Zhao
A sample of Co3O4 mesoporous nanorods (Co3O4-MNR) with a considerable number of Co2+ vacancy defects was prepared by a facile method. Co3O4-MNR exhibits highly effective photothermocatalytic activity and excellent durability for the gas-phase oxidation of benzene (a recalcitrant poisonous air pollutant) under UV-visible-infrared illumination from a Xe lamp. It is discovered for the first time that the presence of Co2+ vacancies in Co3O4-MNR massively enhances the photothermocatalytic activity of Co3O4. Compared to a commercial Co3O4 sample (Aladdin) with a smaller number of Co2+ vacancies and TiO2 (P25), the CO2 production rate of Co3O4-MNR is massively increased by 165 and 309 times, respectively. Co3O4-MNR exhibits efficient photothermocatalytic activity for benzene oxidation even under the visible-infrared illumination of λ > 690 nm. The catalytic oxidation of benzene on Co3O4-MNR under the illumination of the Xe lamp follows a mechanism of solar-light-driven thermocatalysis. The experimental evidence of CO-TPR as well as theoretical evidence of density functional theory (DFT) calculations demonstrate that the presence of Co2+ vacancies in Co3O4-MNR significantly increases the activity of the lattice oxygen in Co3O4, thus massively promoting the thermocatalytic activity of Co3O4. Interestingly, a novel photoactivation on Co3O4, quite different from the conventional photocatalysis of semiconductor photocatalysts such as TiO2, is discovered to considerably increase the solar-light-driven thermocatalytic activity of Co3O4-MNR. By combining the experimental evidence of isotope labeling, CO-TPR, and FTIR with the DFT calculations, we obtain a deep insight into the novel photoactivation: the illumination from the Xe lamp enhances the activity of the lattice oxygen in Co3O4-MNR, thus considerably promoting the solar-light-driven thermocatalytic activity of Co3O4-MNR.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2026
·
IF 4.8
Lijuan Chen,Yulin Xu,Yufei Fang,Xiaoyang Qu,Zhiying Yu,Ling Dong,Jianbo Chen
Red yeast rice (RYR) is a traditional fermented product produced by cultivating rice with the filamentous fungus Monascus purpureus . It has been widely utilized in East Asia both as a natural food colorant and as a lipid-lowering herb. Rapid quality assessment is critical for the production, transaction and utilization of RYR. Since empirical evidence suggests that the chromatic properties of RYR correlate closely with its quality, UV–Vis spectrophotometric analysis at specific wavelengths has become a common proxy for rapid quality evaluation of RYR. However, there has been no universal consensus on the selection of these wavelengths. In this study, an active pharmaceutical ingredient (API)-correlated wavelength selection strategy was proposed to ensure analytical accuracy and biological interpretability of the selected UV–Vis wavelengths for the rapid quality assessment of RYR. Integrated bioinformatic analysis confirmed that Monascus pigments (e.g., monascin, rubropunctatin, rubropunctamine) and monacolin K were the dominant pharmacologically active components of RYR. Notably, both the profiles and concentrations of these pigments varied significantly across RYR samples from different manufacturers. Through systematic correlation analysis and principal component analysis (PCA), three optimal characteristic wavelengths were identified: 570 nm (associated with monascin and rubropunctamine), 450 nm (associated with rubropunctatin), and 230 nm (roughly associated with monacolin K). This work not only establishes chemically rational, API-informed UV–Vis wavelengths for standardized RYR quality assessment, but also offers a transferable methodological framework for the rapid quality control of other pigment-rich fermented products.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2016
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IF 2.653
Kangming Xiong,Caixia Yin,Jianbin Chao,Yongbin Zhang,Fangjun Huo
In this work, two high selective and sensitive fluorescent probes for ClO − , 7-Hydroxycoumarin and 4-Hydroxycoumarin were designed. The reaction mechanism that we speculated was the oxidized ring opening reaction and hydrolysis. The detection could be realized in quasi-aqueous phase and the detection limits of probe [7] and probe [4] for ClO − were found to be 56.8 nM and 70.5 nM. Furthermore, the probes can be used to cell imagings.
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Separations
·
2026
·Vol. 13
·期 9
·254
·
IF 3.5
Shanmei Li,Mingxuan Li,Jianping Meng,Ligang Yu
Rapid and accurate quantification of residual guar gum in bauxite slurry flocculation is a critical bottleneck for closed-loop control of flocculant dosage. In this study, we systematically compared the anti-interference performance of the two UV-Vis spectrophotometer approaches, the single-wavelength absorbance method (A263) and the peak-trough difference method (ΔA), in complex slurry matrices. Our results revealed that the two methods respond differently to pH and salt concentration variations, leading to the proposal of a dual-mode synergistic detection strategy. The A263method provides quantification under the specific conditions tested within the ranges of pH 3.0–8.0 and CaCl2concentration below 4.5 mmol/L. Beyond these boundaries, deviations from the Beer-Lambert law occurred, attributable to conformational transitions or salting-out aggregation of the polymer chains. In contrast, the ΔA method partially mitigated background drift through differential calculation and exhibited a more stable signal trend than A263across the tested ranges (pH 2.0–11.0, CaCl20–18 mmol/L), suggesting its potential utility as a semi-quantitative indicator in challenging matrices. However, its quantitative precision was constrained by small absolute signal values and systematic dependence on pH and salt conditions. Based on these findings, we propose a synergistic strategy-preferring the A263method under routine conditions while recommending the ΔA method for high-salinity or wide-pH scenarios- and accordingly define the preliminary applicability boundaries based on signal response observations at a single concentration. Flocculation–sedimentation tests confirmed that the method successfully determined the optimum dosage (5.0 g/kg dry slurry), at which the residual concentration in the supernatant correlated negatively with the sedimentation rate (R2> 0.95). The supernatant matrix after sedimentation (pH ≈ 7.1, low ionic strength) fell exactly within the safe window. This work provides a methodological reference for spectrophotometric quantification of trace organics in turbid, saline, and pH-variable slurry systems, and lays an analytical foundation for intelligent dosage control in bauxite slurry dewatering.
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