NANOTECHNOLOGY
·
2022
·Vol. 33
·期 40
·405502
·
IF 3.953
Ziqin Zhuang,Li Zhang,Chaozhu Huang,Xiaohang Wang,Haichuan Guo,Tiju Thomas,Fengdong Qu,Pei Wang,Minghui Yang
Surface modification by employing precious metals is one of the most effective ways to improve the gas-sensing performance of metal oxide semiconductors. Pure α-Fe2O3 nanoparticles and Pt-modified α-Fe2O3 nanoparticles were prepared sequentially using a rather simple hydrothermal synthesis and impregnation method. Compared with the original α-Fe2O3 nanomaterials, the Pt-α-Fe2O3 nanocomposite sensor shows a higher response value (Ra/Rg = 58.6) and a shorter response/recovery time (1 s/168 s) to 100 ppm dimethyl disulfide (DMDS) gas at 375 °C. In addition, it has better selectivity to DMDS gas with the value of more than 9 times higher than the other target gases at 375 °C. This study indicates that the Pt-α-Fe2O3 nanoparticle sensor has good prospects and can be used as a low-cost and effective DMDS gas sensor.
研究领域:
材料科学
·
传感器技术
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2014
·
IF 3.065
Lidan Lv,Jie Zhang,Chongpin Huang,Zhigang Lei,Biaohua Chen
The removal of dimethyl disulfide from model liquefied petroleum gas using metal salt impregnated zeolite as the adsorbent was studied in a fixed-bed adsorption equipment. Effects of different carrier, metal iron species and content of active component, mass space velocity, temperature, as well as adsorption selectivity and regeneration performance were all investigated by performing the breakthrough experiment. Among all these adsorbents, 5 wt.%Ag 2 O/NaY showed the highest breakthrough sulfur capacity. The adsorption selectivity of Ag 2 O/NaY was studied by the infrared spectra. It was found that the direct S–Ag(I) interaction was the essential reason for the evidently improved adsorption ability and selectivity of Ag 2 O/NaY for removing disulfide from solutions containing olefin . Regeneration study indicated that the saturated adsorbent was regenerated under the temperature of 550 °C for 8 h in the air atmosphere. After five times regeneration, the adsorbent Ag 2 O/NaY still shows high breakthrough sulfur capacity.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ECONOMIC ENTOMOLOGY
·
2013
·Vol. 106
·期 3
·1349-1354
·
IF 1.6
Zhao Na Na,Zhang Hang,Zhang Xue Chang,Luan Xiao Bing,Zhou Cheng,Liu Qi Zhi,Shi Wang Peng,Liu Zhi Long
In our screening program for insecticidal activity of the essential oils/extracts derived from some Chinese medicinal herbs and spices, garlic (Allium sativum L.) essential oil was found to possess strong insecticidal activity against overwintering adults of Cacopsylla chinensis Yang et Li (Hemiptera: Psyllidae). The commercial essential oil of A. sativum was analyzed by gas chromatography-mass spectrometry. Sixteen compounds, accounting for 97.44% of the total oil, were identified, and the main components of the essential oil of A. sativum were diallyl trisulfide (50.43%), diallyl disulfide (25.30%), diallyl sulfide (6.25%), diallyl tetrasulfide (4.03%), 1,2-dithiolane (3.12%), allyl methyl disulfide (3.07%), 1,3-dithiane (2.12%), and allyl methyl trisulfide (2.08%). The essential oil of A. sativum possessed contact toxicity against overwintering C. chinensis, with an LC50 value of 1.42 μg per adult. The two main constituent compounds, diallyl trisulfide and diallyl disulfide, exhibited strong acute toxicity against the overwintering C. chinensis, with LC50 values of 0.64 and 11.04 μg per adult, respectively.
研究领域:
植物化学
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昆虫学
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害虫管理
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DOI
PubMed
高影响因子
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2014
·Vol. 99
·期 7
·3211-3220
·
IF 3.811
Wang Xiangqian,Wu Chao,Liu Nan,Li Sujing,Li Wei,Chen Jianmeng,Chen Dongzhi
A Pseudomonas sp. strain WL2 that is able to efficiently metabolize ethyl mercaptan (EM) into diethyl disulfide (DEDS) through enzymatic oxidation was isolated from the activated sludge of a pharmaceutical wastewater plant. One hundred percent removal of 113.5 mg L −1 EM and 110.3 mg L −1 DEDS were obtained within 14 and 32 h, respectively. A putative EM degradation pathway that involved the catabolism via DEDS was proposed, which indicated DEDS were further mineralized into carbon dioxide (CO 2 ), bacterial cells, and sulfate (SO 4
2− ) through the transformation of element sulfur and ethyl aldehyde. Degradation kinetics for EM and DEDS with different initial concentrations by strain WL2 were evaluated using Haldane-Andrews model with maximum specific degradation rates of 3.13 and 1.33 g g −1 h −1 , respectively, and maximum degradation rate constants of 0.522 and 0.175 h −1 using pseudo-first-order kinetic model were obtained. Results obtained that aerobic degradation of EM by strain WL2 was more efficient than those from previous studies. Substrate range studies of strain WL2 demonstrated its ability to degrade several mercaptans, disulfides, aldehydes, and methanol. All the results obtained highlight the potential of strain WL2 for the use in the biodegradation of volatile organic sulfur compounds (VOSCs).
研究领域:
微生物学
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环境科学
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DOI
PubMed
高影响因子
CHROMATOGRAPHIA
·
2021
·Vol. 84
·期 3
·219-231
·
IF 2.044
Wang Yu,Zhou Qianru,Yang Wei,Yang Qianzhan,Zhang Xuejing,Yue Xiaochun
Taste-and-odor occurrence has extensive socio-economic impacts on drinking water, which is now a public health concern. Sulfur odorants can significantly affect the esthetic quality of drinking water and arouse unpleasant organoleptic experience of consumers, which can also harm the human body at high concentration levels. Researches on analysis of sulfur odorants in air and environmental water are numerous, while the reports on analysis of them in tap water are few. The analysis of sulfur odorants in tap water is quite different with it in environmental samples owing to the treatment of the water plant, such as the introduction of disinfectants. In this paper, a novel and practical method for determining the dimethyl disulfide (DMDS) and dimethyl trisulfide (DMTS) in tap water and source water by purge-and-trap coupled to gas chromatography–mass spectrometry (GC–MS) analysis was proposed. The evaluations of sample preservation were performed due to the adverse impact caused by the remaining disinfectant in tap water on the analysis of DMDS and DMTS, including the investigation on the selection and the dosage of preservatives. Besides, aspects affecting the preconcentration procedure and GC–MS analysis of DMDS and DMTS were investigated as well. Moreover, the proposed method was validated by five independent laboratories from different regions of China, representing a good linearity with correlation coefficients ( r ) ranged from 0.9990 to 0.9999 for both DMDS and DMTS between the concentrations of 10 ng L −1 and 100 ng L −1 . The method detection limit (MDL) and limit of quantification (LOQ) of DMDS and DMTS were 3 ng L −1 and 10 ng L −1 , respectively. Meanwhile, satisfactory precision and accuracy were also obtained when the method was applied to detect DMDS and DMTS in tap water and source water. The relative standard deviation (RSD) was 0.90–7.3% for DMDS and 1.1–7.6% for DMTS, and the recovery was 81.2–120% for DMDS and 73.6–118% for DMTS. Furthermore, the repeatability limits and reproducibility limits of DMDS and DMTS were acquired, ranging from 0.631 to 5.71 at low, medium and high concentrations. The proposed method is an effective, environmentally friendly, and promising approach for routine monitoring of DMDS and DMTS in tap water and source water.
研究领域:
环境科学
·
分析化学
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产品关联
DOI
高影响因子
Catalysts
·
2019
·Vol. 9
·期 12
·994
·
IF 3.444
Junan Gao,Song Gao,Jun Wei,Hong Zhao,Jie Zhang
In this paper, the catalytic combustion of DMDS (dimethyl disulfide, CH3SSCH3) over bimetallic supported catalysts were investigated. It was confirmed that Cu/γ-Al2O3-CeO2showed best catalytic performance among the five single-metal catalysts. Furthermore, six different metals were separately added into Cu/γ-Al2O3-CeO2to investigate the promoting effect. The experiments revealed Pt as the most effective promoter and the best catalytic performance was achieved as the adding amount of 0.3 wt%. The characterization results indicated that high activity and resistance to sulfur poisoning of Cu-Pt/γ-Al2O3-CeO2could be attributed to the synergistic effect between Cu and Pt.Keywords:catalytic combustion;dimethyl disulfide;bimetallic;supported catalyst
研究领域:
催化
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环境科学
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
·
2025
·
IF 2.7
Tingxiang Yang,Lerong Qi,Hao Yang,Yihan Xia,Zhen Wang,Dong Hao Wang
Derivatization of unsaturated fatty acids with dimethyl disulfide (DMDS) and analysis by electron ionization mass spectrometry (EIMS) represent a convenient offline method for the identification of double bond positions. However, the presence of overlapping mass spectra from multiple compounds poses significant challenges for spectral interpretation and library matching, leading to ambiguous molecular information and low sensitivity. To overcome the issue, we developed a novel chemical ionization (CI) tandem mass spectrometry method involving the pre-derivatization with DMDS and collisional activation of [M+47]+ ions generated in the chemical ion source. The method provides better specificity to the analysis of targeted fatty acids and does not require any customized devices. Further, a multiple reaction monitoring (MRM) version of the method was designed by screening all the diagnostic ions of possible double bond positional isomers, which significantly boosts the sensitivity. Compared to the traditional EIMS method, the new method exhibits a lower limit of detection (LLOD) that is one-tenth or lower. Employing the new method, unusual isomer 18:2(5Z,8Z) was co-analyzed with 18:2(9Z,12Z), and a novel 20:2(7Z,10Z) was characterized in human sebum. Additionally, 16:2(9Z,12Z), an odd-chain omega-3 polyunsaturated fatty acid (21:5n-3) and polymethylene-interrupted isomers, i.e. 22:2(7Z,13Z) and 22:2(7Z,15Z) were identified in seafood and related products. Our method can be readily applied to any GC instrument equipped with tandem MS and is expected to facilitate the discovery and identification of unknown fatty acids from food, clinical, and environmental sources.
研究领域:
分析化学
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生物化学
·
营养学
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产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Junping Wang,Ying Wen,Fangjun Huo,Caixia Yin
Due to the importance of hydrogen sulfide (H 2 S) in physiology and pathology, the development of fluorescence probes for the detection of H 2 S has attracted extensive attention of researchers. We developed a H 2 S fluorescence probe ( DCN-S ) based on dicyanoisopentanone using dithioether and ester groups as the reaction sites. Under the nucleophilic substitution of H 2 S, disulfide bond of DCN-S was broken. Then the probe changed into dicyanoisophorone derivative and emitted an orange fluorescence band from 530 nm to 700 nm (centred 580 nm). Upon response for H 2 S, DCN-S exhibited high sensitivity (88 nM detection limit) and large stokes shift (155 nm). Importantly, the probe also was successfully used for endogenous and exogenous imaging of living cells.
研究领域:
分析化学
·
生物化学
·
细胞生物学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Lirui Ren,Bin Huang,Wensheng Fang,Daqi Zhang,Hongyan Cheng,Zhaoxin Song,Dongdong Yan,Yuan Li,Qiuxia Wang,Zhiqiang Zhou,Aocheng Cao
Dimethyl disulfide (DMDS), a promising alternative fumigant, has been highly desirable for excellent management of soil pests and diseases. However, high volatility and moderate toxicity of this sulfide limit its application. To address these issues, a novel controlled release formulation of DMDS was proposed employing multiple emulsions and polyurea microcapsules (DMDS@MEs-MCs). The successful combination of the two technologies was revealed by confocal laser scanning microscopy, scanning electron microscopy, thermogravimetric analysis, and Fourier transform infrared. According to the multiple encapsulation structure, the encapsulation efficiency decreased by only 3.13% after thermal storage, compared with a 15.21% decrease of microcapsules made with only a monolayer film. DMDS@MEs-MCs could effectively control the release of active ingredient, which increased applicator and environmental safety during application. Moreover, it could be facilely used by spraying and drip irrigation instead of a special fumigation device. The innovative formulation exhibited better control efficacy on soil pathogens (Fusarium spp. and Phytophthora spp.) and root-knot nematodes (Meloidogyne spp.) than DMDS technical concentration (DMDS TC). In addition, it did not inhibit seed germination after 10 days when the plastic film was removed from the fumigated soil. This method appears to be of broad interest for the development of safe and handy fumigant application.
研究领域:
农业科学
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化学工程
·
植物病理学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
·
2022
·Vol. 88
·期 6
·
IF 5.005
Yuan Gong,Jia-Qi Liu,Ming-Jie Xu,Chun-Mei Zhang,Jun Gao,Cheng-Guo Li,Ke Xing,Sheng Qin
Volatile organic compounds (VOCs) produced by microorganisms are considered promising environmental-safety fumigants for controlling postharvest diseases. Ceratocystis fimbriata, the pathogen of black spot disease, seriously affects the quality and yield of sweet potato in the field and postharvest. This study tested the effects of VOCs produced by Streptomyces setonii WY228 on the control of C. fimbriata in vitro and in vivo. The VOCs exhibited strong antifungal activity and significantly inhibited the growth of C. fimbriata. During the 20-day storage, VOC fumigation significantly controlled the occurrence of the pathogen, increased the content of antioxidants and defense-related enzymes and flavonoids, and boosted the starch content so as to maintain the quality of the sweet potatoes. Headspace analysis showed that the volatiles 2-ethyl-5-methylpyrazine and dimethyl disulfide significantly inhibited the mycelial growth and spore germination of C. fimbriata in a dose-dependent manner. Fumigation with 100 μL/L 2-ethyl-5-methylpyrazine completely controlled the pathogen in vivo after 10 days of storage. Transcriptome analysis showed that volatiles mainly downregulated the ribosomal synthesis genes and activated the proteasome system of the pathogen in response to VOC stress, while the genes related to spore development, cell membrane synthesis, mitochondrial function, and hydrolase and toxin synthesis were also downregulated, indicating that WY228-produced VOCs have diverse modes of action for pathogen control. Our study demonstrates that fumigation of sweet potato tuberous roots with S. setonii WY228 or use of formulations based on the VOCs is a promising new strategy to control sweet potato and other food and fruit pathogens during storage and shipment.IMPORTANCE Black spot disease caused by Ceratocystis fimbriata has caused huge economic losses to worldwide sweet potato production. At present, the control of C. fimbriata mainly depends on toxic fungicides, and there is a lack of effective alternative strategies. The research on biological control of sweet potato black spot disease is also very limited. An efficient biocontrol technique against pathogens using microbial volatile organic compounds could be an alternative method to control this disease. Our study revealed the significant biological control effect of volatile organic compounds of Streptomyces setonii WY228 on black spot disease of postharvest sweet potato and the complex antifungal mechanism against C. fimbriata. Our data demonstrated that Streptomyces setonii WY228 and its volatile 2-ethyl-5-methylpyrazine could be a candidate strain and compound for the creation of fumigants and showed the important potential of biotechnology applications in the field of food and agriculture.
研究领域:
微生物学
·
植物病理学
·
食品科学
·
农业生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2020
·
IF 4.192
Yujiao Cheng,Russell Rouseff,Guijie Li,Houjiu Wu
The off-flavor produced after thermal stabilization of mandarin (Citrus reticulata, Blanco) juices has limited the production of commercial juices. Methanethiol, a putrid-smelling sulfur volatile, has been identified for the first time in heated mandarin juices. Identification was achieved using a combination of capillary gas chromatography with two dissimilar columns and a dual sulfur-specific pulsed flame photometric detector and selected ion mass spectrometry detection. Static headspace solid-phase microextraction quantitation found that average odor activity values (OAVs) in heated juices were 25.5 for methanethiol compared to 10.8 for dimethyl sulfide. OAVs for methanethiol and dimethyl sulfide in fresh juices were ND (not detected) and 5.5, respectively. Hydrogen sulfide, carbonyl sulfide, carbon disulfide, and dimethyl disulfide were also identified and quantitated. Thermal decomposition studies of nonvolatile sulfur-containing potential precursors indicated that methionine was the major source of methanethiol. Additional heating studies with model juices demonstrated that ascorbic acid greatly accelerated the formation of methanethiol and methional, as well as dimethyl di and tri sulfides.
研究领域:
食品科学
·
分析化学
·
农业化学
✓ 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）