JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
·
2024
·Vol. 105
·期 1
·579-590
·
IF 3.3
Aliya,Yufa Cao,Danni Zhang,Shi Liu,Shui Jiang,Yuan Liu
BACKGROUND Baijiu is a traditional Chinese liquor produced from grains through fermentation, distillation, aging and blending. The flavor of Baijiu is influenced by factors such as raw materials, starter, processes and the environment, and since the relationship between these factors and the flavor of Baijiu is still being analyzed, the identification of different Baijiu is still somewhat difficult. In this paper, the volatile differential markers of 42 types of strong-aroma Baijiu of different origin, alcohol content and grade were explored. RESULTS A total of 24 volatile substances were detected by gas chromatography–electronic nose (GC-E-Nose) and 99 volatile substances were detected by gas chromatography–time-of-flight mass spectrometry (GC-TOF MS). The peak areas of the substances obtained by GC-E-Nose were analyzed by the partial least squares (PLS) method, and the substances with variable importance in projection (VIP) >1 were screened out. Combined with the qualitative results of GC-TOF MS, four substances (isobutyric acid, 2-butanone, 2,3-butanediol and 3-methylbutyric acid) were selected as volatile differential markers for strong-aroma Baijiu. An external standard curve was established to accurately quantify these four substances, and the Kruskal–Wallis test confirmed that the absolute contents of these four substances varied significantly among different samples ( P < 0.01). Principal component analysis and hierarchical cluster analysis based on the absolute content of these four substances showed that different samples were prioritized for different alcohol contents. CONCLUSION These four substances can be used as volatile differential markers of strong-aroma Baijiu samples. This research provides theoretical support for the detection and improvement of Baijiu product quality. © 2024 Society of Chemical Industry.
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
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Jingzhi Hou,Hongyan Zhang,Chu Chen,Chen Yang,Haiyang Zhang,Zhipeng Li
In this study, a high-performance ammonia (NH 3 ) gas sensor based on a CeO 2 /CdS heterojunction with increased surface defects was prepared using the hydrothermal method. First-principles calculations based on density functional theory (DFT) were employed to elucidate the sensing mechanism. Experimental results indicate that more surface defects and surface hydroxyl groups can effectively enhance the performance of the CeO 2 /CdS NH 3 gas sensor at room temperature. The response value of CeO 2 /CdS is 739.5 at a concentration of 500 ppm NH 3 , and the response/recovery time at 50 ppm is 1.27 s/1.63 s, which is faster compared with the previously reported NH 3 gas sensors based on CeO 2 . Theoretical calculations suggest that the presence of more oxygen vacancies or sulfur vacancies on the surface of CeO 2 or CdS can lead to the generation of additional d electrons and the capture of more NH 3 molecules. Furthermore, it was discovered for the first time that the d-band center of CeO 2 could shift upward under more surface oxygen vacancies and hydroxyl groups, which can improve the chemical activity of the CeO 2 /CdS and enhance its adsorption capacity for NH 3 molecules. This research constructed CeO 2 /CdS with multiple surface defects through a heterogeneous structure, providing new ideas for developing high-performance NH 3 gas sensors.
研究领域:
材料科学
·
传感器技术
·
表面化学
·
纳米材料
·
气体传感
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Wei Ni,Gangtian Zhu,Fei Liu,Can Xie,Wei Li,Shukui Zhu
Carboxylic acids (CAs) are important molecular markers in petroleum geochemistry, which can indicate the origin, migration and biodegradation of oils. In this work, an easy and fast method was developed for the separation and analysis of CAs in crude oils by the combination of gas purge microsyringe extraction (GP-MSE) and comprehensive two-dimensional gas chromatography-mass spectrometry (GC × GC–MS). CAs in oils were firstly reacted with a silylation reagent to improve their volatility and thermal stability. The silylated CAs were then separated from oils together with light hydrocarbons with GP-MSE treatment at a relatively low temperature (200 °C). Subsequently, direct analysis of the extract solutions by GC × GC–MS was performed. Profited from the extremely high peak capacity of GC × GC, the signals of silylated CAs could be easily distinguished from hydrocarbon signals. Under optimal conditions, the extraction time and the solvent consumption of GP-MSE were 8 min and 150 μL, respectively. In the analysis of reservoir crude oils with different biodegradation degrees, abundant CA signals were successfully detected, and the contents of CAs were found to vary regularly with the biodegradation degree.
研究领域:
石油地球化学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 3
·602
·
IF 4.2
Yang Yue,Jiaxin Yin,Jingyi Xie,Shufang Wu,Hui Ding,Lifeng Han,Songtao Bie,Wen Song,Ying Zhang,Xinbo Song,Heshui Yu,Zheng Li
The flower buds of threePanaxspecies (PGF:P. ginseng; PQF:P. quinquefolius; PNF:P. notoginseng) widely consumed as health tea are easily confused in market circulation. We aimed to develop a green, fast, and easy analysis strategy to distinguish PGF, PQF, and PNF. In this work, fast gas chromatography electronic nose (fast GC e-nose), headspace-gas chromatography-ion mobility spectrometry (HS-GC-IMS), and headspace solid phase microextraction-gas chromatography-mass spectrometry (HS-SPME-GC-MS) were utilized to comprehensively analyze the volatile organic components (VOCs) of three flowers. Meanwhile, a principal component analysis (PCA) and heatmap were applied to distinguish the VOCs identified in PGF, PQF, and PNF. A random forest (RF) analysis was used to screen key factors affecting the discrimination. As a result, 39, 68, and 78 VOCs were identified in three flowers using fast GC e-nose, HS-GC-IMS, and HS-SPME-GC-MS. Nine VOCs were selected as potential chemical markers based on a model of RF for distinguishing these three species. Conclusively, a complete VOC analysis strategy was created to provide a methodological reference for the rapid, simple, and environmentally friendly detection and identification of food products (tea, oil, honey, etc.) and herbs with flavor characteristics and to provide a basis for further specification of their quality and base sources.Keywords:Panax;flower bud;fast GC e-nose;HS-GC-IMS;HS-SPME-GC-MS;multivariate statistical analysis
研究领域:
分析化学
·
植物化学
·
食品科学
·
药用植物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Wenhui Lu,Mingshuo Zhu,Chunli Ding,Xuebo Li,Junchao Ma,Yinghua Qi,Mengshuo Guo
Natural coal can be produced via desulfurization, decarbonization, and other processes under appropriate pressure and temperature conditions, enabling it to react with gasification agents and produce gas. Fine slag and coarse slag are both by-products of the entrained-flow gasifier and may contain a large amount of carbonaceous residue. To explore the optimization of the gasification process, coal upgrading, and adulteration identification, qualitative and semi-quantitative characterizations of the volatile organic components in gasification slag and natural coals were carried out using Gas chromatography–ion mobility spectrometry (GC–IMS) and gas chromatography–mass spectrometry (GC–MS). Fingerprint spectra were generated to illustrate the volatile differences and specificities. A total of 51 kinds of volatiles were analyzed using a rapid and non-destructive detection method under ambient conditions by GC–IMS method. GC–MS, acting as a supplementary identification method, detected a total of 40 volatile compounds, among which alkanes were in the majority. Characteristic markers were explored to achieve the accurate differentiation of volatiles from natural coal and gasification slag samples. Multivariate analyses, including heatmap, hierarchical cluster analysis (HCA), principal component analysis (PCA), partial least squares discriminant analysis (PLS-DA), and orthogonal partial least squares discrimination analysis (OPLS-DA), were conducted to discriminate the odor of natural coal and gasification slag samples. This study deepens the understanding of volatile distribution and lays the foundation for the development of gasification technology and adulteration monitoring.
研究领域:
能源化学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2025
·
IF 6.1
Zhihua Zhao,Shixin Ma,Zijie Su,Huiqin Li,Qilin Zou
The development of triboelectric nanogenerator (TENG)-powered gas sensors capable of actively harvesting environmental energy has become critically important in today's energy-conscious world. This study presents a triethylamine (TEA) gas sensor based on a PVA/MXene/CoFe 2 O 4 nanocomposite hydrogel TENG, utilizing heterointerface-rich MXene/CoFe 2 O 4 nanomaterials combined with polyvinyl alcohol (PVA) polymer matrix. Systematic characterization via XRD, XPS, SEM, and TEM elucidated the composite's elemental composition and microstructure. The PTMC-7 TENG-powered sensor demonstrated exceptional electrical output, generating 170 V open-circuit voltage under 7 N contact force at 1 Hz frequency - sufficient to power 30 LEDs through rectifier-integrated circuits. Its silicone encapsulation enabled finger-joint mounted micro-motion detection. The sensor exhibited 105.11 % response to 100 ppm TEA at room temperature with fast response/recovery (31 s/23 s) and outstanding stability (<3.2 % degradation over 30 days). By converting TENG output modulation into gas concentration readings, this design achieves battery-free TEA detection while synergistically integrating energy harvesting and sensing functionalities, establishing a novel paradigm for flexible sensor development.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL PHYSICS LETTERS
·
2024
·
IF 2.8
Dongping Huang,Shuifa Shen
Monoclinic BiVO 4 material was successfully synthesized through a hydrothermal method, and silver (Ag) nanoparticles were deposited onto the surface of BiVO 4 using the photo deposition technique. The gas-sensing outcomes demonstrate that the BiVO 4 material loaded with 2 wt% Ag has a good gas-sensing response to isopropanol, which is about three times that of pure BiVO 4 . In addition, it exhibits a fast response within 10 s and well-stability. The improved gas sensing properties primarily come from the catalytic and spillover effect mechanism of Ag.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xianghao Meng,Sibo Kang,Zhihua Zhao,Guixin Jin,Zhigang Shao,Lan Wu
Bi 2 O 3 microspheres modified with CeO 2 were successfully synthesized via the hydrothermal method, and a gas sensor based on this composite material was prepared. Various analytical techniques were employed to examine the morphological and structural characteristics of the Bi 2 O 3 /CeO 2 composites. The synthesized Bi 2 O 3 microspheres exhibited a uniform size, with a particle diameter of approximately 2.5 μm. CeO 2 nanoparticles could be clearly observed on the surface of the Bi 2 O 3 microspheres. The results of X-ray photoelectron spectroscopy revealed that the adsorbed oxygen and oxygen vacancies on Bi 2 O 3 doped with CeO 2 increased, potentially due to the presence of Ce 3+ /Ce 4+ ions. The Bi 2 O 3 /CeO 2 sensors demonstrated significantly enhanced sensing properties for formaldehyde at room temperature. At a formaldehyde concentration of 100 ppm, the reactivity of the Bi 2 O 3 /CeO 2 sensor was 137 %, exhibiting a 6.6-fold enhancement compared to the Bi 2 O 3 sensor. Furthermore, the adsorption energy, differential charge density, and state density of the sample were calculated using density functional theory (DFT). Subsequently, the gas-sensing mechanism was analyzed and discussed. The results indicate that CeO 2 -modified Bi 2 O 3 nanospheres can enhance the adsorption energy of formaldehyde. The formation of a heterojunction facilitates electron transfer, thereby improving the gas-sensing properties. Furthermore, the gas sensing mechanism was discussed and analyzed using density functional theory (DFT) calculations.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Chemosensors
·
2025
·Vol. 13
·期 2
·45
·
IF 3.7
Wenhao Li,Bo Zhang,Xiangrui Dong,Qi Lu,Hao Shen,Yi Ni,Yuechen Liu,Haitao Song
In this work, WO3/TiO2core–shell (C-S) nanowires (NWs) were successfully synthesized by the coaxial electrospinning method and subsequent high-temperature calcination treatment. After some microscopic structural characterizations, although the prepared WO3–TiO2and TiO2–WO3C-S NWs displayed quite different surface morphologies, both of the shell coatings were uniform and their typical shell thicknesses were extremely close, with mean values of 22 and 20 nm, respectively. In gas sensing tests, WO3/TiO2C-S NWs exhibited good selectivity towards triethylamine (TEA) without significant interfering gases. Compared with bare WO3and TiO2NWs, WO3/TiO2C-S NWs showed better gas sensing performance. Specifically, the optimal operating temperature and response of TiO2–WO3C-S NWs to 100 ppm TEA were 130 °C and 106, which were reduced by 70 °C and increased by 5.73 times compared to bare WO3, respectively. Obviously, the C-S nanostructures contributed to improving the gas sensing performance of materials towards TEA. Finally, some hypothetical sensing mechanisms were proposed, which were expected to have important reference significance for the design of target products applied to TEA sensing.
研究领域:
材料科学
·
纳米技术
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
IEEE SENSORS JOURNAL
·
2024
·
IF 4.3
Bolun Tang,Yunbo Shi,Canda Zheng,Kuo Zhao
To date, various materials have been widely investigated for developing highly selective and sensitive sensors for NO
2
, a common hazardous gas. However, the associated NO
2
-gas-sensor fabrication methods exhibit several drawbacks, which hinder the development of NO
2
-sensitive gas sensors with excellent selectivity. In this study, NiP
2
-Ni
2
P polymorphs with observable heterointerfaces were prepared using metalloid NiP
2
and metallic Ni
2
P for NO
2
gas sensing, and the characteristics of the synthesized polymorphs were evaluated through X-ray diffraction and energy-dispersive spectrometry. At 160 °C, the fabricated sensor exhibited a response of 1.5%-93.14% for NO
2
gas over a concentration range of 0.5-60 ppm; its response and recovery times were 16 and 55 s, respectively. In addition, the sensor exhibited excellent NO
2
selectivity and long-term stability. Density functional theory calculations revealed the adsorption sites of NO
2
molecules on NiP
2
, and the gas-sensing mechanism was elucidated. The findings of this study establish NiP
2
-Ni
2
P, which is currently employed as an outstanding electrocatalyst for hydrogen evolution, as a potential NO
2
sensor platform with excellent selectivity and efficient recovery characteristics.
研究领域:
材料科学
·
化学传感器
·
环境监测
·
理论化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2024
·Vol. 130
·期 10
·1-12
·
IF 2.5
Tang Mingxin,Qin Cong,Sun Xueya,Li Mengwei,Wang Yihui,Cao Jianliang,Wang Yan
Hydrogen (H 2 ) energy, as a clean energy source, has high energy density and durability, while H 2 is flammable and explosive, which requires strict safety technology measures to ensure the safety of high-pressure storage transportation. Therefore, the development of sensitive sensors is needed. In this study, In 2 O 3 microspheres with different Pd loadings were fabricated by hydrothermal method. Compared with the pristine In 2 O 3 gas sensor, the optimal operating temperature of the In 2 O 3 sensor is reduced from 160 ℃ to 80 ℃ after loading Pd. Among the prepared Pd/In 2 O 3 gas sensors, the response value of the 2 at% Pd/In 2 O 3 sensor towards 1000 ppm H 2 is 50.743 at 80 ℃. The response/recovery time is 80 s/235 s. The improved H 2 sensing performance can be ascribed to the chemical and electron sensitization of Pd, and the formation of PdO, PdH x . This study shows that Pd-loaded In 2 O 3 can effectively reduce the optimal operating temperature and enhance the response value for detecting H 2 in the range of 5-5000 ppm. Therefore, this sensor has good application prospects for detecting H 2 at low temperatures.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2017
·
IF 4.95
Yinhui Yang,Qinsi Wang,Meiling Qi,Xuebin Huang
Triptycene-based materials feature favorable physicochemical properties and unique molecular recognition ability that offer good potential as stationary phases for capillary gas chromatography (GC). Herein, we report the investigation of utilizing a π -extended triptycene material (denoted as TQPP) for GC separations. As a result, the TQPP capillary column exhibited high column efficiency of 4030 plates m −1 and high-resolution performance for a wide range of analytes, especially structural and positional isomers. Interestingly, the TQPP stationary phase showed unique shape selectivity for alkanes isomers and preferential retention for analytes with halogen atoms and H-bonding nature mainly through their halogen-bonding and H-bonding interactions. In addition, the TQPP column had good repeatability and reproducibility with the RSD values of 0.02–0.34% for run-to-run, 0.09–0.80% for day-to-day and 1.4–5.2% for column-to-column, respectively, and favorable thermal stability up to 280 °C. This work demonstrates the promising future of triptycene-based materials as a new class of stationary phases for GC separations.
研究领域:
分析化学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）