MOLECULES
·
2023
·Vol. 28
·期 2
·522
·
IF 4.6
Li Mu,Qi Tong,Yuhang Liu,Xianglong Meng,Peng He,Gang Li,Linyang Ye
Under gas-liquid microextraction (GLME) operating conditions (extraction temperature 270 °C, extraction time 7 min, condensation temperature −2 °C, and carrier nitrogen gas speed 2.5 mL/min), ice cream samples, as a representative food, were pre-treated. The volatile aroma components of each sample was qualitatively analysed using GC-MS. The principal component analysis was conducted to classify the functional groups, which showed that alcohols, acids, esters, ketones, and aldehydes were the main compounds responsible for the aroma of ice cream. It was found that furan-3-carboxaldehyde, 3-furanmethanol, 2(5H)-furanone, 5-methylfuranal, 2,5-diformylfuran, 3-hydroxy-2-methyl-4-pyrone, 5-hydroxymethylfurfural, ethyl maltol, and glycerol were routinely used flavour ingredients in ice cream.Keywords:ice cream;gas-liquid microextraction (GLME);food composition analysis;classification of functional groups;principal component analysis
✓ 已验证
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2019
·
IF 3.021
Zhitao Han,Tian Lan,Zhiwei Han,Shaolong Yang,Jingming Dong,Deping Sun,Zhijun Yan,Xinxiang Pan,Liguo Song
Experiments were conducted to simultaneously remove NO and SO2 from simulated exhaust gas by cyclic scrubbing and online supplementing pH-buffered NaClO2 solutions in a bench-scale reactor. The effects of key operating parameters on pollutant removal performance had been investigated. The results suggested that an extremely high oxidant utilization rate could be obtained when the oxidant supplementing molar rate approached the oxidant consumption molar rate. Though co-existing SO2 in flue gas would consume a certain amount of the oxidant during the absorption process, the intermediate products of SO32– ions generated from SO2 hydrolysis might be in favor of NO2 absorption to some extent. The introduction of ethanol in scrubbing solution could enhance NOx removal performance largely, which was possibly because of its inhibition effect on SO32– oxidation. The reaction mechanism and reaction products in scrubbing solutions were also discussed roughly through theoretical calculations and ion chromatography analysis.
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 17
·1807191
·
IF 15.621
Zequn Yang,Hailong Li,Jianping Yang,Shihao Feng,Xi Liu,Jiexia Zhao,Wenqi Qu,Pu Li,Yong Feng,Po-Heng Lee,Kaimin Shih
A key challenge in elemental mercury (Hg 0 ) decontamination from flue gas lies in the design of a sorbent with abundant reactive adsorption sites that exhibit high affinity toward Hg 0 to simultaneously achieve rapid capture and large capacity. Herein, zeolitic imidazolate framework-8 (ZIF-8) supported copper selenide (CuSe) nanocomposites are synthesized by a newly designed two-step surfactant-assisted method. The as-prepared CuSe/ZIF-8 with CuSe to ZIF-8 mass ratio of 80% (0.8NC-ZIF) exhibits unparalleled performance toward Hg 0 adsorption with equilibrium capacity and average rate reaching 309.8 mg g −1 and 105.3 µg g −1 min −1 , respectively, surpassing all reported metal sulfides and traditional activated-carbon-based sorbents. The impressive performance of 0.8NC-ZIF for Hg 0 immobilization is primarily attributed to the adequate exposure of the Se-terminated sites with high affinity toward Hg 0 resulted from the layered structure of CuSe. The adsorbed mercury selenide exhibits even higher stability than the most stable natural mercury ore—that is, mercury sulfide—hence minimizing its environmental impact when the CuSe/ZIF-8 sorbent is dumped. This work provides a new mindset for future design of sorbents for efficient Hg 0 capture from industrial flue gas. The results also justify the candidature of CuSe/ZIF to be applicable for mercury pollution remediation in real-world conditions.
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2019
·Vol. 12
·期 4
·898-907
·
IF 7.804
Dong-Dong Qin,Jing-Jing Quan,Shi-Fang Duan,Jovan San Martin,Yixiong Lin,Xiaolin Zhu,Xiao-Qiang Yao,Jin-Zhan Su,Ingrid Rodríguez-Gutiérrez,Chun-Lan Tao,Yong Yan
Graphical A single step for g-C 3 N 4 , a giant leap for water splitting : A simple phosphide gas treatment of g-C 3 N 4 coated TiO 2 -nanorod configuration not only narrows the band gap of g-C 3 N 4 by 0.57 eV into visible range but also generates a metal phosphide (M=Fe, Cu) water oxidation cocatalyst in situ. This TiO 2 /g-C 3 N 4 /FeP configuration significantly improves charge separation and transfer capability, resulting in an enhanced photoelectrochemical water oxidation. Graphitic carbon nitride (g-C 3 N 4 ) has been widely explored as a photocatalyst for water splitting. The anodic water oxidation reaction (WOR) remains a major obstacle for such processes, with issues such as low surface area of g-C 3 N 4 , poor light absorption, and low charge-transfer efficiency. In this work, such longtime concerns have been partially addressed with band gap and surface engineering of nanostructured graphitic carbon nitride (g-C 3 N 4 ). Specifically, surface area and charge-transfer efficiency are significantly enhanced through architecting g-C 3 N 4 on nanorod TiO 2 to avoid aggregation of layered g-C 3 N 4 . Moreover, a simple phosphide gas treatment of TiO 2 /g-C 3 N 4 configuration not only narrows the band gap of g-C 3 N 4 by 0.57 eV shifting it into visible range but also generates in situ a metal phosphide (M=Fe, Cu) water oxidation cocatalyst. This TiO 2 /g-C 3 N 4 /FeP configuration significantly improves charge separation and transfer capability. As a result, our non-noble-metal photoelectrochemical system yields outstanding visible light (>420 nm) photocurrent: approximately 0.3 mA cm −2 at 1.23 V and 1.1 mA cm −2 at 2.0 V versus RHE, which is the highest for a g-C 3 N 4 -based photoanode. It is expected that the TiO 2 /g-C 3 N 4 /FeP configuration synthesized by a simple phosphide gas treatment will provide new insight for producing robust g-C 3 N 4 for water oxidation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2019
·
IF 6.35
Xu You,Junjie Wu,Yuwu Chi
Recently emerging perovskite quantum dots (PQDs) with several excellent optical properties, such as quantum efficiency, narrow band emission, and tunable emission wavelength, have promising applications in solar cells and light emitting diodes. However, relatively rare applications of PQDs can be found in the field of sensing, mainly due to the very easy degradation of PQDs upon exposure to water or ambient humidity. In this work, for the first time CH3NH3PbBr3 PQDs were encapsulated into superhydrophobic silica aerogels (AGs) to protect PQDs from being degraded by water. The synthesized PQDs@AGs not only maintain the strong fluorescence emission activity of PQDs but also show excellent stability in the presence of water. Additionally, PQDs@AGs have abundant pores making them very suitable for gas sensing. For improving sensing performances, 3D-printing technology is introduced into gas cell design and fabrication for the first time. Finally, a novel, sensitive, selective, and reversible fluorescence sensor for SO2 gas based on the PQDs@AGs functional material and the 3D-printed gas cell has been developed.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 12
·1-7
·
IF 5.705
Pang Yachao,Zang Xiaohuan,Wang Mengting,Chang Qingyun,Zhang Shuaihua,Wang Chun,Wang Zhi
A fibrous magnetic boron nitride nanocomposite was synthesized and is shown to be a viable adsorbent for the magnetic solid phase extraction of pesticides prior to their quantitation by gas chromatography with electron capture detection. The optimum conditions were obtained by both single factor optimization and response surface analysis (Box-Behnken design). Under the optimized conditions, the response to the ten pesticides (dicofol, α-endosulfan, p,p’ -DDE, nitrofen, β -endosulfan, p,p’ -DDD, p,p’ -DDT, bifenthrin, permethrin and fenvalerate) is linear in the 0.03–40 ng·mL −1 concentration range with the coefficients of determination ranging from 0.9970 to 0.9992. The relative standard deviations at concentration levels of 0.5 ng·mL −1 , 20 ng·mL −1 and 40 ng·mL −1 were below 8.7%. The recoveries of the analytes from spiked tea water and tea beverage samples varied between 84.5% and 122%, with relative standard deviations ranging from 4.8 to 12%. The limits of detection are between 0.01 and 0.05 ng·mL −1 . The adsorbent can be reused over 50 times without significant loss of extraction efficiency.
A novel fibrous-shape magnetic boron nitride nanocomposite (Fe 3 O 4 @ f -BN) was used as the adsorbent for the magnetic solid phase extraction (MSPE) of ten pesticides from tea water and tea beverage samples prior to their determination by gas chromatography (GC).
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Rongji Cui,Suxia Ma,Jie Wang,Shujun Sun
The catalytic gas-phase H 2 O 2 oxidation of NO was achieved over Fe-based catalysts supported on montmorillonite K10, γ-alumina and ZSM-5. ESR tests illustrate that the three catalysts can catalyze decomposition of H 2 O 2 yielding highly reactive hydroxyl radicals , of which Fe/K10 has the fastest rate, followed by Fe/γ-alumina. Fe 3+ in Fe/K10 and Fe/γ-alumina show lower density of electron cloud due to a strong interaction between Fe 3+ and the support, which benefits the electron transfer from the H 2 O 2 to Fe 3+ , thus favoring the production of hydroxyl radicals. Fe species exist on the surface of Fe/K10 mainly in the form of Fe 2 O 3 , whereas Fe species of Fe/γ-alumina and Fe/ZSM-5 exist mainly in the form of Fe 3 O 4 , and it is found that Fe 2 O 3 is more active than Fe 3 O 4 in catalytic gas-phase H 2 O 2 oxidation of NO. Interestingly, Fe/ZSM-5 has the lowest efficiency in generating hydroxyl radicals, its NO removal efficiency is 90%, which is much higher than 47.5% for Fe/γ-alumina and 62.3% for Fe/K10. In-situ IR results suggested that Fe/ZSM-5 are dual functional in oxidation of NO, that is, whether both Fe ion sites and Brønsted acid sites collectively provide the catalytic functionality. In the meantime, a possible reaction mechanism on catalytic gas-phase H 2 O 2 oxidation of NO over Brønsted acid sites is proposed.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF FOOD SCIENCE AND TECHNOLOGY-MYSORE
·
2019
·Vol. 56
·期 9
·4009-4015
·
IF 1.85
Qin Hao,Li Bao-cai,Dai Wei-feng,Xiang Cheng,Qin Yi,Jiao Shi-yun,Zhang Mi
Volatiles have been regarded as active substances in many foods, whose chemicals can be analyzed by GC–MS qualitatively and quantitatively. However, the activities of volatiles are often studied as a whole, and it has no an effective method to determine that which molecule is active in volatiles by far. In order to identify the antioxidant molecules in volatiles, a rapid determination method was developed by GC–FID/MS combined with DPPH radical reaction in this study. Three antioxidant molecules were identified and validated among 20 components in rose tea infusion. Their activity validation and the methodological evaluation indicated this method could be used for distinguishing antioxidant molecules in volatiles rapidly and effectively.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2019
·
IF 5.399
Gangtian Zhu,Fei Liu,Peiyang Li,Sheng He,Shukui Zhu,Qiang Gao,Yuqi Feng
The analysis of free fatty acids (FFAs) in edible oils can provide important information for quality control and oil authentication. Herein, we report the comprehensive profiling of FFAs in edible oils via magnetic dispersive extraction combined with comprehensive two-dimensional gas chromatography-mass spectrometry (GC × GC–MS). A magnetic extractant was designed for dispersive extraction of FFAs. The extraction conditions were carefully optimized. To assess the extraction method, we first use the method for analysis of 7 targeted FFAs. The limits of detection range from 5.6 to 25.8 ng g −1 , and the recoveries in oil samples are 81%–107%. We then performed comprehensive profiling of untargeted FFAs in oil by combining the extraction method with GC × GC–MS. A total of 64 FFAs were identified positively or putatively. The proposed method can provide FFA fingerprint data to guide the processing, storage and authentication of edible oils.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Zhigang Li,Zongyao Qian,Shaoyang Hu,Tingting Gong,Qiming Xian
In this study, the molecularly imprinted polymers (MIPs) with high specific surface area and extraction efficiency of N-Nitrosodiphenylamine (NDPhA) were successfully prepared and a highly sensitive and selective method was developed for determination of NDPhA in water samples using MIPs solid-phase extraction (SPE) coupled with gas chromatography mass spectrometry (GC-MS) detection. The MIPs were successfully prepared using the method of precipitation polymerization and using methacrylic acid as the functional monomer , ethylene glycol dimethacrylate as the cross-linker, and N, N-Diphenylformamide as the template molecule. The newly synthesized MIPs were characterized and used as SPE sorbents . Under the optimized conditions, the average recoveries of NDPhA spiked in ultrapure water were higher than 94% ± 2.9% at three different concentrations and the limit of detection and limit of quantitation were 0.8 ng L −1 and 2.4 ng L −1 , respectively. Moreover, the high selectivity of MIPs was attained and the satisfactory recoveries of NDPhA which were spiked in to real samples were achieved in the range of 92–107% with relative standard deviations (RSDs) within 0.3–7.9%. The low levels of NDPhA were detected in the two of twelve wastewater samples with concentrations of 5.6 ng L −1 and 3.6 ng L −1 with RSDs of 5.6% and 2.8%, respectively. The developed MIP-SPE method was proved to be practically feasible for selective extraction and enrichment of NDPhA in real water samples.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2018
·
IF 3.849
Guojie Zhang,Yinghui Sun,Ying Xu,Riguang Zhang
Activated carbon (AC) was treated with melamine to prepare nitrogen-doped carbon materials (AC-N), which used as support to prepare Co supported catalysts for CH 4 –CO 2 reforming (DRM) reaction and its catalytic performance was investigated. The modified (Co/AC-N) and unmodified (Co/AC) catalyst were characterized by BET, H 2 -TPR, XRD, TEM, XPS, CO 2 -TPD and FTIR. It was found that the modified catalyst not only showed excellent stability, but also had better catalytic activity than the unmodified catalyst. Although the physical structure of modified catalysts is almost same with the unmodified catalysts, nitrogen and some oxygen functional groups such as pyridine nitrogen, pyrrole nitrogen, hydroxyl and oxygen incarbonyl groups were generated on the AC surface during the amination treatment. The generated surface nitrogen and oxygen functional groups affect not only influence the dispersion of active metals but affect the valence distributions of cobalt. Compared with the untreated catalyst, small active particle size with a narrow size distribution formed on the surface of N-doped catalyst. Moreover, the modified catalyst also provides more basic sites for the reforming reaction to accelerate the adsorption and dissociation of CO 2 on the active site of the catalyst.
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2018
·
IF 4.946
Zhen Shi,Dan Chen,Tian-Tian Chen,Ge Wei,Chun-Yan Yin,Hui Xu,Guang-Fu Yang
A novel solid phase microextraction-gas chromatography-mass spectrometry (SPME-GC–MS) method was developed to quantify two new fungicide residuals (Y13149, Y12196) in mung bean sprouts. With a stable and biocompatible elcetrospinning nanofiber (polystyrene/graphene@silica, PS/G@SiO 2 ) as coating, the SPME fiber was directly inserted into the stem of mung bean sprout to in-situ in-vivo sampling and extraction, followed by GC–MS analysis. Under the optimal conditions, satisfactory average recoveries of 99% and 72% were obtained for Y13149 and Y12196 with the relative standard deviations (RSDs) under 16.3%, indicating good precision and anti-matrix ability of the method. The result also exhibited low detection limit (0.06–0.08 μg·L −1 ) and wide liner range (0.3–100 μg·L −1 ) with the correlation coefficients (R 2 ) of 0.9989. The established method was applied successfully to trace the accumulation and distribution of fungicides in mung bean sprouts, and it provides a simple, rapid and reliable quantitative method for food analysis .
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）