Article
Chemistry, Applied
Luqing Li, Yurong Chen, Shuai Dong, Jingfei Shen, Shuci Cao, Qingqing Cui, Yan Song, Jingming Ning
Summary: The study developed a comprehensive evaluation method for Keemun black tea using micro-near-infrared spectroscopy, computer vision, and colorimetric sensor array. Different algorithms were applied to discriminate between tea grades and determine flavor substances. The results showed that the combination of spectral, shape, color, and aroma data can provide a rapid and comprehensive assessment of Keemun black tea quality.
Article
Food Science & Technology
Yuanfeng Chen, Li Liu, Yuan Rao, Xiaodan Zhang, Wu Zhang, Xiu Jin
Summary: This paper used the fusion of near-infrared Spectroscopy (NIRS) and Computer Vision Technology (CVS) to detect the woolliness response disease of Dangshan pears. The fusion model showed better performance and provided a theoretical basis for nondestructive detection.
Article
Food Science & Technology
Guangxin Ren, Ying Liu, Jingming Ning, Zhengzhu Zhang
Summary: The study successfully developed a method to identify the authenticity of Keemun black tea quality through hyperspectral imaging, multivariate analysis, and data fusion. By combining various features, support vector machine and random forest were used to classify tea samples of seven grades, with the random forest model performing the best.
INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
(2021)
Article
Food Science & Technology
Wenjing Huang, Guofu Lu, Wei-Wei Deng, Jingming Ning
Summary: This study compared the taste quality of Keemun black tea with different withering treatments and found significant differences in bitterness and astringency between teas with natural withering, sun withering, and warm-air withering. Chemical analysis showed that catechin content was highest in sun withering, possibly due to sunlight promoting its conversion. The study also revealed a synergistic relationship between taste and tasting compounds, highlighting the importance of different withering methods in quality control and flavor enhancement of Keemun black tea.
LWT-FOOD SCIENCE AND TECHNOLOGY
(2022)
Article
Spectroscopy
Zhongyuan Liu, Rentian Zhang, Chongshan Yang, Bin Hu, Xin Luo, Yang Li, Chunwang Dong
Summary: This study successfully established a prediction model for the changes in moisture content during the processing of green tea using machine vision and near-infrared spectroscopy technology. The PLSR and SVR models based on middle-level data fusion showed better prediction accuracy compared to low-level data fusion.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Agriculture, Multidisciplinary
Guangxin Ren, Yujie Wang, Jingming Ning, Zhengzhu Zhang
Summary: This study successfully developed an evaluation method using hyperspectral imaging technology and chemometric algorithms to distinguish authentic Dianhong black tea from other tea categories.
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
(2021)
Article
Chemistry, Applied
Luqing Li, Qingqing Cui, Menghui Li, Tiehan Li, Shuci Cao, Shuai Dong, Yujie Wang, Qianying Dai, Jingming Ning
Summary: This study synthesized stable and sensitive hemp spherical AgNPs as the SERS substrate for the simultaneous and rapid detection of adulteration in black tea. The AgNPs showed satisfactory stability over 60 days with an enhancement factor of 108. Among the different screening methods, CARS-PLS exhibited superior performance for the quantification of the colorants with high accuracy and precision.
Article
Food Science & Technology
Wenjing Liao, Wenjiao Li, Suyu Liu, Dong Tang, Yunxi Chen, Yijun Wang, Zhongwen Xie, Jinbao Huang
Summary: The nonabsorptive components of Keemun black tea and Dianhong black tea can modulate the intestinal microbiota and increase the production of short-chain fatty acids. These components also have different effects on the abundance of beneficial bacteria compared to fructooligosaccharide, indicating their potential as novel prebiotics.
FOOD SCIENCE AND HUMAN WELLNESS
(2022)
Article
Spectroscopy
Luqing Li, Yujie Wang, Shanshan Jin, Menghui Li, Quansheng Chen, Jingming Ning, Zhengzhu Zhang
Summary: A novel and low-cost evaluation method using smartphone imaging and micro-NIR spectrometer was proposed to classify the quality grades of Keemun black tea. The PCA-SVM model was established to analyze color, texture, and spectral data, with low-level and middle-level fusion strategies introduced for analyzing the data. Results showed that the accuracy of mid-level data fusion was higher, indicating the effectiveness of this method.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Chemistry, Applied
Wenjing Huang, Shimao Fang, Jing Wang, Chao Zhuo, Yonghua Luo, Yilei Yu, Luqing Li, Yujie Wang, Wei-Wei Deng, Jingming Ning
Summary: This study analyzed the aroma composition of Keemun black tea (KBT) under different withering methods, including natural withering, sun withering, and warm-air withering. Significant differences were found among the three samples. Eleven aroma-active compounds were identified as responsible for the differences in aroma caused by different withering methods. Linalool and geraniol were responsible for flowery and fruity aromas when sun withering was applied, while methional contributed to the intense roasty aroma when warm air withering was employed. The results were further validated by quantitative descriptive analysis and addition experiments.
Article
Food Science & Technology
Mingchun Wen, Yuqing Cui, Cai-Xia Dong, Liang Zhang
Summary: Monosaccharides in Keemun black tea were quantitatively determined using PMP pre-column derivatization and HPLC method, with D-glucose identified as the predominant monosaccharide. The concentration of D-glucose continuously increased during tea processing, while the concentration of theaflavins decreased significantly. Additionally, the study identified some theaflavins glucose adducts through LC-MS/MS analysis.
FOOD RESEARCH INTERNATIONAL
(2021)
Article
Food Science & Technology
Yunwei Niu, Yue Zhang, Zuobing Xiao, Jiancai Zhu, Fengmei Zhang, Feng Chen
Summary: This study explored the interaction between deuterium-depleted water (DDW) and Keemun black tea (KBT) for the first time. The content of volatile substances in KBT in different deuterium concentrations was determined using stir bar sorptive extraction (SBSE) and gas chromatography-mass spectrometry. Results showed that DDW with a deuterium content of 40 ppm promoted the release of aroma substances in KBT, while other water inhibited their release. This study provides theoretical guidance for the application of DDW in tea connoisseurship.
LWT-FOOD SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Analytical
Guangxin Ren, Rui Wu, Lingling Yin, Zhengzhu Zhang
Summary: This study used machine vision and hyperspectral image technology to develop a rapid method for assessing the appearance quality of Dianhong Congou black tea samples. The results showed that feature fusion was able to comprehensively reflect the external information of tea leaves, and intelligent classification algorithms combined with image analysis techniques were an effective strategy for identifying regional black tea.
ANALYTICAL LETTERS
(2023)
Article
Food Science & Technology
Qiaoyi Zhou, Zhenhua Dai, Feihu Song, Zhenfeng Li, Chunfang Song, Caijin Ling
Summary: To monitor the fermentation quality of black tea objectively, a computer vision system and electronic nose were used to analyze the image and odor features of Yinghong No.9 black tea. The fermentation process was divided into three stages based on the trends of tea polyphenols, volatile substances, image eigenvalues, and odor eigenvalues. Principal component analysis and partial least squares discriminant analysis were employed to analyze the data, and a feature-level fusion strategy with support vector machine showed the highest classification accuracy rates of 100% for training sets and 95.6% for testing sets. The performance of support vector regression models for tea polyphenol content prediction based on feature-level fusion data outperformed data-level models.
Article
Agriculture, Multidisciplinary
Guoping Lai, Mingchun Wen, Zongde Jiang, Feng Zhou, Hui-Xia Huo, Mengting Zhu, Zisheng Han, Zixin Zhao, Chi-Tang Ho, Liang Zhang
Summary: This study found that flavan-3-ols and chlorogenic acid are involved in the enzymatic oxidation during black tea processing. It identified a new oligomer called dichlorogeniccatechin (DCGC), composed of two molecules of chlorogenic acid and one molecule of (-)-epigallocatechin. The study also analyzed the effects of reactant ratio and reaction time on DCGC formation and measured the content of DCGC in Keemun black tea.
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
(2023)
Article
Spectroscopy
Zh. E. Ozbekova, A. A. Abdyldaev, A. A. Kulmyrzaev
Summary: This study compared two drying methods for cow and yak muscles, finding that freeze drying caused less discoloration. Additionally, analysis of fluorescence spectra allowed for accurate prediction of chemical composition and color characteristics of the muscles.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Leo Mandic, Ivan Ljubic, Iva Dzeba
Summary: In this study, a combined experimental and computational approach was used to investigate the photoexcitation and photodegradation mechanisms of Doxazosin (DOX). The results provide valuable insights into the primary events following the photoexcitation of DOX and its potential applications.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Xiufeng Wang, Yao Jin, Wenhui Ai, Siqi Wang, Zhiqing Zhang, Ting Zhou, Fang Wang, Guodong Zhang
Summary: This study successfully synthesized near infrared fluorescence Ag2S quantum dots (QDs) and developed a dual-mode sensor for sulfide anion using the excellent oxidase-like characteristics of manganese dioxide (MnO2) nanosheets. The sensor showed a wider detection range, higher sensitivity, and shorter reaction time, making it suitable for highly selective detection of sulfide in different concentration ranges.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Yafei Li, Yanming Ma, Chuantao Zheng, Di Yu, Lien Hu, Shuo Yang, Fang Song, Yadan Li, Shuanghai Liu, Zhanrui Zhang, Yu Zhang, Yiding Wang, Frank K. Tittel
Summary: To effectively monitor gas explosion and coal spontaneous combustion in coal mine, an intrinsically safe and explosion-proof dual-gas sensor system was developed for methane (CH4) and carbon monoxide (CO) measurement. The system achieved different measurement ranges using laser scanning and gas cells, and improved stability and accuracy through gas pre-treatment and temperature compensation algorithm.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Pei-Rong Chen, Li-Kang Chu
Summary: In this study, the hydrates of glyoxal were investigated using infrared absorption spectrometry. The results showed that at low concentrations, glyoxal mainly exists as monomeric dihydrate. These findings provide suitable detection windows for further research on the roles of glyoxal and its hydrates in atmospheric and aerosol chemistry, as well as the relevant reaction kinetics.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Nichole O'Neill, Thamires A. Lima, Fabio Furlan Ferreira, Nicolas J. Alvarez, Reinhard Schweitzer-Stenner
Summary: This study determines the main fibril axis of GHG gel-forming fibrils using various techniques and compares the results with simulated data. The analysis suggests that the hydrophobic xz-surfaces of GHG fibrils could be a good target for the adsorption of hydrophobic drugs.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Mengyuan Liu, Hanchuang Zhu, Yikun Fang, Caiyun Liu, Xinke Li, Xiaohui Zhang, Lixue Ma, Kun Wang, Miaohui Yu, Wenlong Sheng, Baocun Zhu
Summary: ABHS is an efficient fluorescent probe that can accurately and sensitively detect Al3+ with strong resistance to interference. It also demonstrates excellent detection and imaging capabilities in complex real samples.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Ahmed S. El-Shafie, Evana Rahman, Yasser Gadelhak, Rehab Mahmoud, Marwa El-Azary
Summary: The recycling of waste mandarin peels into biochar (MRBC) has been used as a high performance and cost-effective adsorbent for treating polluted wastewater effluents. Batch adsorption studies were conducted to analyze the adsorption competency of MRBC on two dyes, methylene blue (MB) and basic fuchsin (BF), either in individual solutions or binary combinations. The results showed that MRBC was capable of effectively removing a high percentage of both dyes. However, the adsorption capacity decreased when the dyes were combined. The cost estimation of MRBC production and wastewater treatment indicated that both were relatively low.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Anindita Bhatta, Jahnabi Upadhyaya, Dipak Chamlagai, Lincoln Dkhar, Pynskhemborlang T. Phanrang, Mohan Rao Kollipara, Sivaprasad Mitra
Summary: Derivatives of thiazole-pyrazole fused benzo-coumarin compounds were synthesized and their photophysical properties were investigated. The synthesized coumarin compounds showed potential as therapeutic agents for Alzheimer's disease, inhibiting acetylcholinesterase activity. The presence of human serum albumin was found to affect the inhibition activity.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Yongwei Duan, Quancheng Liu, Yiju Zhu, Qi Zhang, Xiaohui Duan, Hu Deng, Liping Shang
Summary: In this study, the phase transition of CL-20 was observed using terahertz spectroscopy, and quantum chemical calculations were employed to analyze the vibrations. The results indicated changes in the vibrations of CL-20 before and after phase transition.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Yuefeng Gao, Sai Xu, Baojiu Chen
Summary: This study synthesized Cs2NaInCl6 nanocrystals co-doped with Sb3+ and Tb3+ ions as probes for copper ions detection in lubricating oil. The introduction of Sb3+ effectively reduced the band gap of the host material and enabled energy transfer pathway for Tb3+ emission. The doped Tb3+ ions resulted in the suppression of emission due to electron transfer. The Cs2NaInCl6: 2.5 %Sb3+, 40 %Tb3+ NCs exhibited superior sensitivity and selectivity for copper ions detection.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Yu Liu, Yue Zhang, Changyao Liu, Ce Wang, Baocai Xu, Li Zhao
Summary: A highly sensitive detection platform for heparin was developed using a cationic fluorescent dye (cresyl violet acetate) as a fluorescence probe. The platform demonstrated high selectivity towards heparin and achieved detection in both HEPES solution and serum.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Lopamudra Roy, Nivedita Pan, Susmita Mondal, Ria Ghosh, Md. Nur Hasan, Neha Bhattacharyya, Soumendra Singh, Kallol Bhattacharyya, Arpita Chattopadhyay, Samir Kumar Pal
Summary: The study focuses on the interaction between reactive oxygen species (ROS) and a spectroscopic probe called Rose Bengal (RB), encapsulated in nanoscopic sodium dodecyl sulphate (SDS) micelles and entrapped in microscopic nylon 66 solid matrix. The research demonstrates efficient interaction between ROS and RB-SDS, and investigates the mechanism of hydroxyl radicals generation. Based on these findings, a prototype device utilizing RB embedded in a nylon thin film for quantification of ROS in extracellular fluids and food materials was developed.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Xiaosong Sun, Qihao Cui, Wenyue Dong, Qian Duan, Teng Fei
Summary: Conjugated porous polymers (CPPs) are promising sensing materials and their application in aqueous media is limited. In this study, we synthesized CPPs with porous structure and prepared nanoparticles, enabling efficient photoluminescence sensing of nitroaromatic explosives in aqueous phase.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Maria Cristina Caggiani, Germana Barone, Paolo Mazzoleni
Summary: Raman spectroscopy is commonly used for studying glassy materials in cultural heritage, but it is more difficult to interpret the spectra and apply the technique with portable instruments. In contrast, diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) can be used in archaeometric investigations as it is portable and non-invasive. However, there is limited application of this technique to historical glasses. This exploratory work demonstrates the potential of DRIFTS, in combination with portable X-ray Fluorescence (pXRF) and EDS microanalyses, for studying the composition and alteration of glass samples in cultural heritage.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)