LWT-FOOD SCIENCE AND TECHNOLOGY
·
2020
·
IF 4.006
Shuang Gu,Wei Chen,Zhenhe Wang,Jun Wang,Yujia Huo
This study described the rapid detection of milled rice infected with Aspergillus spp. species based on headspace-gas chromatography ion-mobility spectrometry (HS-GC-IMS) and electronic nose (E-nose) combined with chemometrics, namely principal component analysis (PCA), k-nearest neighbor (kNN) and partial least squares regression (PLSR). 3D HS-GC-IMS imaging and their response differences enabled the discrimination among fungal species. kNN was used to differentiate rice samples with cdifferent levels of fungal infection and achieved correct classified rate of 94.44% and 91.67% by HS-GC-IMS and E-nose, respectively. PLSR method was used for quantitative regression of fungal colony counts in rice samples and good prediction performances were achieved by HS-GC-IMS (R p 2 = 0.909, RMSEP = 0.202) and E-nose (R p 2 = 0.864, RMSEP = 0.235). The results indicated that both HS-GC-IMS and E-nose approaches can potentially be implemented for the detection of fungal contamination levels in milled rice, and HS-GC-IMS fingerprinting coupled with chemometrics might be used as an alternative tool for a highly sensitive method. This research might provide scientific information on the rapid, non-destructive, and effective fungal detection system for rice grains .
研究领域:
食品科学
·
微生物学
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Yue-Yue Chang,Hai-Long Wu,Tong Wang,Huan Fang,Gao-Yan Tong,Yue Chen,Zhao-Yang Wang,Wei Chen,Ru-Qin Yu
In this study, a series of green, interference-free fluorimetric detection methods of the excitation-emission matrix coupled with the second-order calibration methods were proposed for the determination of ibrutinib and pralatrexate in various complicated biological fluids. The second-order advantage of the proposed method can overcome the problem of poor selectivity caused by the wide spectra of the fluorescence method. Even in the presence of uncalibrated interferences and severe peak overlap, the signal of pure substance and accurate quantitative results were still obtained. The average recoveries of the three methods were 94.5–104.9% for Alternating Trilinear Decomposition (ATLD) algorithm, 95.5–105.8% for Alternating Normalization Weighted Error (ANWE) algorithm and 94.4–105.7% for Parallel Factor Analysis (PARAFAC) algorithm, respectively. For ATLD, ANWE and PARAFAC, the relative standard deviations (RSD) were lower than 9.2%, 6.8% and 9.2%, and the RMSEPs were less than 8.1, 8.4 and 8.6 ng mL −1 , respectively. In addition, the elliptic joint confidence region (EJCR) was adopted to further prove the accuracy of the three methods. The results showed that the three methods can accurately be quantified without significant difference. Good figures of merit parameters were also obtained. Among them, the limit of detection (LOD) and limit of quantification (LOQ) of ibrutinib and pralatrexate were in the range of 0.11–0.76 ng mL −1 and 0.21–1.12 ng mL −1 , respectively, which were lower than the corresponding blood concentrations. These results indicate that the proposed method provides a promising, alternative and universal analysis strategy for clinical drug monitoring.
研究领域:
分析化学
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药物分析
·
临床医学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
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2016
·
IF 3.926
Xiao-Li Yin,Hai-Long Wu,Hui-Wen Gu,Yong Hu,Li Wang,Hui Xia,Shou-Xia Xiang,Ru-Qin Yu
This work reports a chemometrics-assisted high performance liquid chromatography-diode array detection (HPLC-DAD) strategy to solve varying interfering patterns from different chromatographic columns and sample matrices for the rapid simultaneous determination of six synthetic colorants in five kinds of beverages with little sample pretreatment. The investigation was performed using two types of LC columns under the same elution conditions. Although analytes using different columns have different co-elution patterns that appear more seriously in complex backgrounds, all colorants were properly resolved by alternating trilinear decomposition (ATLD) method and accurate chromatographic elution profiles, spectral profiles as well as relative concentrations were obtained. The results were confirmed by those obtained from traditional HPLC-UV method at a particular wavelength and the results of both methods were consistent with each other. All results demonstrated that the proposed chemometrics-assisted HPLC-DAD method is accurate, economical and universal, and can be promisingly applied to solve varying interfering patterns from different chromatographic columns and sample matrices for the analysis of complex food samples.
研究领域:
分析化学
·
食品科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yuhang Xin,Yingshuai Wang,Baorui Chen,Xiangyu Ding,Chunyu Jiang,Qingbo Zhou,Feng Wu,Hongcai Gao
As one of the important devices for large-scale electrochemical energy storage, sodium-ion batteries have received much attention due to the abundant resources of raw materials. However, whether it is a base station power source, an energy storage power station, or a start–stop power supply, long energy cycle life (more than 5000 cycles), high stability, and safety performance are application prerequisites. Regrettably, currently, few sodium-ion batteries can meet this requirement, mainly due to shortcomings in positive electrode performance. We report a sufficiently stable sodium-ion battery cathode material, Na2Fe0.95P2O7, that retains 97.5% capacity after 5000 charge/discharge cycles. The use of nonstoichiometry in the lattice enables simultaneous modification of the crystal and electronic structure, promoting Na2Fe0.95P2O7 to be extremely stable while still being able to achieve a capacity of 92 mAh g–1 and stable cycling at high temperatures up to 60 °C. Our results confirm the positive effect of nonstoichiometric ratios on the performance of Na2Fe0.95P2O7 and provide a reliable idea to promote the practical application of sodium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2016
·
IF 2.933
Rong Tu,Dingheng Zheng,Hong Cheng,Mingwei Hu,Song Zhang,Mingxu Han,Takashi Goto,Lianmeng Zhang
Halide chemical vapor deposition process was carried out for fast fabricating oriented stoichiometric β-SiC through controlling flow rate of precursors (SiCl 4 and CH 4 ). The effects of molar ratio of C and Si precursors ( R C/Si ) on composition, preferred orientation, microstructure and deposition rate ( R dep ) were investigated. The deposits transformed from silicon-rich to stoichiometric β-SiC to carbon-rich with increasing R C/Si . 〈110〉-oriented stoichiometric β-SiC with lower density of defects were obtained at R C/Si in the range of 0.86–1.00, where the maximum R dep was 883 μm/h at R C/Si = 1.00, leading to a thickness of 1.7 mm in 2 h deposition. Formation of ridge-like morphology has been discussed based on a twin plane propagation model .
研究领域:
材料科学
·
无机非金属材料
·
薄膜制备技术
·
晶体生长
·
结构表征
✓ 已验证
DOI
高影响因子
Small
·
2024
·Vol. 21
·期 5
·2409004
·
IF 13
Zhongshi Zhang,Jing Xia,Jing Li,Xuanze Li,Lifeng Tian,Jianyu Cao,Yuye Li,Xiangmin Meng
Ferroelectricity in two-dimensional (2D) materials at room temperature has attracted significant interest due to their substantial potential for applications in non-volatile memory, nanoelectronics, and optoelectronics. The intrinsic tendency of 2D materials toward nonstoichiometry results in atomic configurations that differ from those of their stoichiometric counterparts, thereby giving rise to potential ferroelectric polarization properties. However, reports on the emergence of room temperature ferroelectric effects in nonstoichiometric 2D materials remain limited. This study reports the observation of room temperature ferroelectricity in nonstoichiometric AgCr 1-x S 2 ternary 2D transition metal dichalcogenides synthesized via chemical vapor deposition. The noncentrosymmetric crystal structure and switchable ferroelectric polarization are confirmed through second harmonic generation (SHG) and piezoresponse force microscopy (PFM) measurements. It is determined that the primary cause of ferroelectric polarization is the interlayer movement of ordered asymmetric Ag atoms under the influence of numerous chromium (Cr) vacancies along with interlayer atom displacement. Furthermore, two types of electrical devices based on in-plane (IP) and out-of-plane (OOP) polarization are demonstrated. This work offers a new perspective for fabricating ternary ultrathin 2D transition metal dichalcogenides ferroelectric materials and presents a potential pathway for creating exceptional multifunctional materials.
研究领域:
材料科学
·
凝聚态物理
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Xiao Li,Lixuan Zhang,Tingsong Li,Chen Hu,Haobo Hao,Lexiang Wu,Dariusz Hreniak,Jiang Li
The use of Faraday isolators in high-power lasers is currently a high-priority research topic and terbium gallium garnet (Tb 3 Ga 5 O 12 , TGG) transparent ceramic is a magneto-optical material with great potential for applications in the visible and near-infrared ranges. In this paper, the effect of chemical composition adjustment on the microstructure and properties of Tb 3 Ga 5(1+x) O 12 ceramics (where x is the non-stoichiometric index corresponding to the percentage difference in the amount of Ga used in the synthesis with respect to its content in the stoichiometric compound) was investigated. Powders obtained from starting materials of different stoichiometry were found to have similar morphology. However, the relative densities of the ceramics after pre-sintering in air increase with increasing Ga content. After the HIP post-treatment, the optimal properties with an in-line transmittance of 78.5 % (1.5 mm thick) at 1064 nm, and the Verdet constant of the ceramics with x = 0.8 % reaches −134.1 rad T −1 m −1 at 633 nm.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yafei Liu,Ruifeng Wu,Hao Sun,Aimin Chang,Jing Guo,Bo Zhang
Next-generation advanced high-temperature sensors rely heavily on negative temperature coefficient thermosensitive ceramics with low cost, small volume, high sensitivity, and fast response. However, thus far, the enormous challenge of achieving ultrahigh stability and accuracy has become a critical bottleneck restricting the development of thermosensitive ceramics in high-temperature sensor applications. Here, we propose a high-entropy strategy to design a “cation valence self-equilibrium” system in CeNbO4+δ-based ceramics introducing redox couple compensation and ultrahigh density dislocations to solve the problem of temperature-dependent oxygen nonstoichiometry that restricts the performances of high-temperature thermosensitive ceramics. Ferroelastic domains are generated by enhancing the configurational entropy at both A and B sites, resulting in a dramatic increase of dislocation density to >1010 mm–2, which ultimately optimizes the thermosensitive performances. Extreme temperature measurement accuracy with R2 as high as 999.98‰ and RSS as low as 0.011 and high-temperature stability with ΔR/R0 as low as 0.23% after aging at 873 K for 1000 h are realized in high-entropy CeNbO4+δ-based ceramics, indicating a breakthrough in the comprehensive performances of thermosensitive ceramics. This work opens up an effective way to design thermosensitive materials with ultrahigh comprehensive performance to meet the requirements of advanced high-temperature sensors.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2019
·
IF 3.858
Feng-Jie Liu,Yan Jiang,Ping Li,Yang-Dan Liu,Zhong-Ping Yao,Gui-Zhong Xin,Hui-Jun Li
Authentication of original species is embedded in the quality control system of herbal medicines. In this work, ultra-performance liquid chromatography-quadrupole time-of-flight mass spectrometry-based untargeted metabolomics coupled with chemometric analysis was utilized for the precise authentication of the Fritillaria species for both raw materials and commercial products. First, a stepwise difference-enlarging chemometric analysis strategy was proposed to analyze eight medicinal Fritillaria species. Subsequently, 21 species-specific markers were discovered and the specificity was investigated under different sample preparation methods. Finally, the obtained species-specific markers were successfully utilized to identify the Fritillaria species in commercially relevant products. This work is the first to report robust and specific markers for authentication of Fritillaria products, showing promise for tracking the supply chain of herbal suppliers.
研究领域:
药用植物研究
·
中药质量控制
·
代谢组学
✓ 已验证
DOI
高影响因子
POWDER TECHNOLOGY
·
2024
·
IF 4.5
Huifeng Xu,Pengfei Wang,Saiwei Luan,Lixia Cheng,Zhenxiao Fu,Xiuhua Cao,Lei Zhang,Shuhui Yu,Rong Sun
Conventionally, tetragonality in BaTiO 3 powder is attributed to grain size, disregarding the role of Ba/Ti ratio. However, our study reveals a significant impact of Ba/Ti ratio on tetragonality in BaTiO 3 . With an increase in Ba/Ti ratio from 0.990 to 1.010, particle size remains around 200 nm. Tetragonality initially rises from 1.006 to a maximum of 1.0092 at Ba/Ti = 1.000, then decreases to 1.005. Lower tetragonality is associated with Ba or Ti vacancies, using density functional theory (DFT), we analyzed the electron density and lattice distinction in BaTiO 3 powders. Both Ba and Ti vacancies affect lattice distortion, the Ti vacancies leading to more significant lattice expansion and lower tetragonality than Ba vacancies. Using this powder, we fabricated high-density BaTiO 3 ceramics and multi-layer ceramics capacitors (MLCCs) with X7R temperature stability (−55 to 125 °C, ±15% coefficient) and excellent reliability. This strategy has broad implications for tetragonal BaTiO 3 nanopowders and MLCCs development.
研究领域:
材料科学
·
无机非金属材料
·
电子陶瓷
·
固态化学
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Haibo Li,Pengcheng Zhang,Gan Li,Junbo Lu,Quanwen Wu,Yuejiao Gu
Stress as an important parameter of thin films can seriously affect on the properties, performance and long-term stability of the films. Here, we propose a semiquantitative method based on Raman spectroscopy for the stress measurement on nonstoichiometric ceria oxide films . The “chemical strain” of lattice caused by oxygen deficits was a main obstacle factor for the stress measurement of CeO 2−δ films, which was overcome through the calibration of lattice vibration peaks by the normalized intensity of Ce 3+ ions in Raman spectra . A compressive stress about −1.38 ∼ −1.50 GPa was obtained on an oxidated Ce film, which was verified by the substrate-curvature method. Based on the proposed method, Raman spectroscopy could be expanded to wider application fields as an in-situ stress measurement tool, such as in the fields of oxygen-ion-conducting solid electrolytes , oxidation film of alloys, microelectronics and MEMS devices, etc.
研究领域:
材料科学
·
固态离子学
·
薄膜物理
·
微纳电子器件
·
MEMS
✓ 已验证
DOI
高影响因子
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
·
2013
·
IF 2.947
Chen Li,Feng Xu,Chen Cao,Ming-Ying Shang,Cui-Ying Zhang,Jie Yu,Guang-Xue Liu,Xuan Wang,Shao-Qing Cai
Traditional Chinese medicines (TCM) can be identified by experts according to their odors. However, the identification of these medicines is subjective and requires long-term experience. In this paper, electronic nose, headspace gas chromatography–mass spectrometry (GC–MS) and chemometrics methods were applied to differentiate two species of Asari Radix et Rhizoma by their odors. The samples used were the dried roots and rhizomes of Asarum heterotropoides var. mandshuricum (AH) and Asarum sieboldii (AS). The electronic nose was used to determine the odors of the samples and enabled rapid differentiation of AH and AS when coupled with principal component analysis. Headspace GC–MS was utilized to reveal the differences between the volatile constituents of AH and AS. In all, 54 volatile constituents were identified, and 9 major constituents (eucalyptol, eucarvone, 3,5-dimethoxytoluene, 3,4,5-trimethoxytoluene, methyleugenol, 2,3,5-trimethoxytoluene, croweacin, pentadecane and asaricin) could be used as chemical markers to distinguish these two species. AH contained higher relative contents of eucarvone (1.79–16.76%), 3,5-dimethoxytoluene (6.64–26.52%), 3,4,5-trimethoxytoluene/methyleugenol (6.43–31.67%) and 2,3,5-trimethoxytoluene (1.64–6.66%), whereas AS had higher relative contents of eucalyptol (14.06–24.95%), croweacin (5.64–13.55%), pentadecane (8.44–20.82%) and asaricin (7.03–13.45%). Moreover, AH and AS could be distinguished according to the contents of either all 54 identified volatile constituents or only the 9 major constituents by employing cluster analysis. The proposed method is rapid, simple, eco-friendly and can successfully differentiate these two species of Asari Radix et Rhizoma by their odors.
研究领域:
中药鉴定
·
分析化学
·
天然药物化学
·
代谢组学
·
药用植物学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）