摘要：
The authenticity of honey currently poses challenges to food quality control, thus requiring continuous modernization and improvement of related analytical methodologies. This review provides a comprehensively overview of honey authenticity challenges and related analytical methods. Firstly, direct and indirect methods of honey adulteration were described in detail, commenting the existing challenges in current detection methods and market supervision approaches. As an important part, the integrated metabolomic workflow involving sample processing procedures, instrumental analysis techniques, and chemometric tools in honey authenticity studies were discussed, with a focus on their advantages, disadvantages, and scopes. Among them, various improved microscale extraction methods, combined with hyphenated instrumental analysis techniques and chemometric data processing tools, have broad application potential in honey authenticity research. The future of honey authenticity determination will involve the use of simplified and portable methods, which will enable on-site rapid detection and transfer detection technologies from the laboratory to the industry.
通讯机构：
[Xu, S ] U;[Shi, L ; Xu, S] H;Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chemo Biosensing & Chemometr, Changsha 410082, Peoples R China.;Univ Jinan, Sch Chem & Chem Engn, Jinan 250022, Peoples R China.
摘要：
We propose a practical strategy to design a series of heavy-atom-free synergistic phototherapy agents (CSQs) with both photodynamic therapy (PDT) and photothermal therapy (PTT) under NIR wavelength excitation by simply replacing the indole salt of xanthene Changsha (CS) with quinoline salt.
期刊：
Energy & Fuels,2023年37(20):15867–15878 ISSN：0887-0624
通讯作者：
Yang, FM
作者机构：
[Long, Sheng; Liang, Hai-Cheng; Zou, Pan; Yang, Fan-Ming; Liao, Min; Zhang, Ke-Yi; Xie, Du; Jiang, Kai] Hunan City Univ, Coll Mat & Chem Engn, Yiyang 413000, Hunan, Peoples R China.
通讯机构：
[Yang, FM ] H;Hunan City Univ, Coll Mat & Chem Engn, Yiyang 413000, Hunan, Peoples R China.
摘要：
Porous materials of PEI(n)/Zr-(N)-KIT-6 were prepared by doping zirconium to the KIT-6 framework and introducing poly(ethylenimine) (PEI) to the pore channels (n is the weight percentage of PEI to Zr-(N)-KIT-6, and N is the molar ratio of Zr/Si). The adsorbents were characterized and tested at a 20% CO2 concentration to investigate the influence of Zr and PEI on CO2 adsorption. The results display that Zr-O-Si bonds are formed after the doping of Zr species. In addition, PEI is loaded on the surface through the formation of hydrogen bonds and Zr-N bonds. The synthesized PEI(n)/Zr-(N)-KIT-6 materials keep stable when the temperature is lower than 210 degrees C. In addition, the materials exhibit good CO2 adsorption performance, which is attributed to the existence of Zr and PEI. The Lewis acidity of KIT-6 is improved after the doping of Zr heteroatoms, leading to the immobilization of more PEI and the enhancement of CO2 adsorption properties. The adsorption includes two steps: diffusion of CO2 in the pore channels and the reaction between CO2 and amine groups. When the gas flow rate is 40 mL/min, the maximum CO2 adsorption capacity of 174.7 mg/g is achieved. After 20 cycles, the adsorption value keeps stable.
期刊：
Journal of Mathematical Chemistry,2023年61(4):877-892 ISSN：0259-9791
通讯作者：
Xin Huang
作者机构：
[Huang, Xin] Hunan City Univ, Management Sch, Yiyang 413000, Peoples R China.;[Xia, Li] Hunan City Univ, Sch Chem & Environm Engn, Yiyang 413000, Peoples R China.
通讯机构：
[Xin Huang] M;Management School, Hunan City University, Yiyang, People’s Republic of China
关键词：
Split regularized regression;Wavelength interval selection;Partial least squares;Near-infrared spectroscopy
摘要：
Wavelength selection has become a critical step in the analysis for near-infrared (NIR) spectroscopy with high co-linearity and large number of spectral variables. In this study, a novel wavelength interval selection method based on split regularized regression and partial least squares (SplitReg-PLS) is developed. SplitReg-PLS is a two-step approach, which combines the advantage of the SplitReg and PLS methods. SplitReg presents interesting properties, which can split the variables into groups and pool the regularized estimation of the regression coefficients together as groups. The PLS regression is one of the most popular methods for multivariate calibration, and is performed on the selected group variables by using the SplitReg. The SplitReg-PLS method can automatically select successive strongly correlated and interpretable spectral variables related to the response, which provides a flexible framework for variable selection. The performance of the proposed procedure is evaluated by three real NIR datasets. The results indicate that SplitReg-PLS is a good wavelength interval selection strategy.
期刊：
Chemometrics and Intelligent Laboratory Systems,2023年234:104756 ISSN：0169-7439
通讯作者：
Xin Huang
作者机构：
[Huang, Xin] Hunan City Univ, Management Sch, Yiyang 413000, Peoples R China.;[Xia, Li] Hunan City Univ, Sch Chem & Environm Engn, Yiyang 413000, Peoples R China.
通讯机构：
[Xin Huang] M;Management School, Hunan City University, Yiyang, 413000, PR China
关键词：
Iterative distance correlation;Near-infrared spectroscopy;Partial least squares;Wavelength interval selection
摘要：
Wavelength selection is a fundamental and critical step in near infrared spectral analysis, which can improve the prediction performance and enhance the interpretability of the model. Motivated by the appealing properties of the distance correlation, a novel wavelength interval selection algorithm, named iterative distance correlation combined with PLS regression (IDC-PLS), is developed. To obtain all the possible wavelength intervals, our method mainly consists of two steps. First, an effective iterative procedure based on distance correlation is used to screen wavelength interval variables. Then, build a series of PLS models by recursive using all the wavelength intervals but one interval until the optimal wavelength intervals obtain, which correspond the lowest root mean square error of prediction. The IDC-PLS integrates the advantages of distance correlation with PLS method, which is an efficient strategy to enhance the performance of PLS in wavelengths selection. The performance of IDC-PLS was tested on three real NIR datasets. The results demonstrate that IDC-PLS can improve prediction performance and efficiently select strongly correlated wavelength intervals related to the response. The proposed method may be a good wavelength interval selection strategy due to its simplicity and efficiency.
作者机构：
[Xiao-Hua Zhang; Jing-Jing Zheng; Kai-Long Yang; Ya-Qian Zhang; Le-Yuan Pan] Henan Key Laboratory of Biomarker Based Rapid-detection Technology for Food Safety, Food and Pharmacy College, Xuchang University, Xuchang, 461000, PR China;[Ren-Jun Liu; Jin-Fang Nie] Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin, 541004, China;[Xiang-Dong Qing] Hunan Provincial Key Laboratory of Dark Tea and Jin-hua, College of Materials and Chemical Engineering, Hunan City University, Yiyang, 413049, PR China
通讯机构：
[Xiao-Hua Zhang] H;[Jin-Fang Nie] C;Henan Key Laboratory of Biomarker Based Rapid-detection Technology for Food Safety, Food and Pharmacy College, Xuchang University, Xuchang, 461000, PR China<&wdkj&>Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin, 541004, China
关键词：
HPLC-DAD fingerprints;ATLD-MCR;Chemometric pattern recognition analysis;Production season;Xinyang Maojian green tea
摘要：
This study aimed to authenticate the production season of Xinyang Maojian green tea, and screen and identify its characteristic components through non-targeted metabonomics methods based on two-dimensional fingerprints combined with chemometric analysis. Firstly, two-dimensional fingerprints of spring and autumn teas were obtained through HPLC-DAD analysis to form a three-dimensional array (retention time × absorption wavelength × sample). Subsequently, the multiple co-elution peaks and spectral profiles in two-dimensional HPLC-DAD fingerprints were resolved by using alternating trilinear decomposition assisted multivariate curve resolution (ATLD-MCR) algorithm. We obtained the relative concentration matrix C (24 × 122), which was further used to distinguish the production season of Xinyang Maojian green tea through chemometric pattern recognition analysis. The evaluation results of both orthogonal partial least squares-discriminant analysis (OPLS-DA) and partial least squares-discriminant analysis (PLS-DA) models were better than those of PCA models, and could effectively distinguish the production season of Xinyang Maojian green teas. Moreover, 5 variables were selected through VIP method to build new UV-scaling and Par-scaling OPLS-DA models. In conclusion, the following characteristic components were identified in accordance with the analytical standards and published data: gallocatechin (GC), theobromine (THB), epigallocatechin gallate (EGCG), gallocatechin gallate (GCG), and epicatechin gallate (ECG).
摘要：
Rod-like porous a-Fe2O3 was synthesized by static hydrothermal treatment at 160 degrees C and used as a symmetric supercapacitor. The phase information, structure, morphology, valence state and composition of the prepared sample were characterized using X-ray diffraction, infrared spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy and N-2 adsorption-desorption. The results show that the prepared a-Fe2O3 is a rod-like porous material dominated by mesopores. Moreover, the a-Fe2O3 is a hexagonal single crystal with [FeO6] octahedrons and the interplanar crystal spacings are large enough for electrolyte ion diffusion. In both KOH and Na2SO4 electrolytes, the a-Fe2O3 sample displays good pseudocapacitance performance. However, the specific discharge capacity and energy density in KOH are larger than in Na2SO4. In 1 mol L-1 of KOH, remarkable capacities of 139 and 35.5 F g(-1 )are obtained and an energy density of 3.91 and 1.01 Wh kg(-1) is achieved at 1 and 20 A g(-1) respectively. After 10 000 cycles, 87.7% of the specific capacitance is still retained at 1 A g(-1). The good capacitance properties may attributed to the rod-like porous structure and large interplanar spacing, which provide good ion insertion-exit paths, enough oxidation-reduction active sites and a fast ion transfer velocity.
摘要：
A new type of hollow urchin-shaped NCM811 ternary-structure material was prepared for high rate charge/ discharge capability and efficient CO2 adsorption. Ni2+/Ni3+, Co2+/Co3+ and Mn4+exist simultaneously in the NCM811 material, and the atomic ration of Ni: Co: Mn is close to 8: 1: 1. In KOH, the NCM811 material shows a pseudocapacitance behavior and achieves a remarkable specific discharge capacity of 208.3 F/g. When the current density is improved to 20 A/g, the capacity still keeps 52.3 %. The excellent rate capability is associated with the hollow urchin-shaped porous structure which provide fast ions migration, large reaction surface area and good heterometallic synergy. The CO2 adsorption results conform to the Bangham mode. At 25 degrees C, a large CO2 adsorption capacity of 3.66 mmol/g is achieved in a flow rate of 35 mL/min. The adsorption process may closely related to the large pore volume and abundant O2-basic sites.
