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Search results for: (2S,3R,4E)-2-Amino-4-hepten-1,3-diol Ethyl Ether C9H19NO2 CAS:

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#34492924   2021/05/16 To Up

Mechanistic insight into hydroxylation of 2,2',4,4'-tetrabromodiphenyl ether during biodegradation by typical aerobic bacteria: Experimental and computational studies.

Polybrominated diphenyl ethers (PBDEs) are a group of persistent pollutants in the environment. Though aerobic biodegradation of PBDEs have been extensively studied, the involved hydroxylation mechanism decisive for whole biotransformation is not clear yet. During the effective biodegradation of 2,2',4,4'-tetrabromodiphenyl ether (BDE-47) by B. xenovorans LB400, the depletion of endogenous ∙OH by scavenger could bring about the significant decrease of biodegradation efficiency whereas ·O was nearly not influential. Given the importance of ∙OH in hydroxylation, the reaction mechanisms along major pathways of electrophilic addition and hydrogen abstraction were theoretically examined by density functional theory (DFT). For the less demand of activation energy, the relative preference of electrophilic addition was shown at aromatic C3-site. When the secondary reaction was considered after addition at C4-site, the barrierless association of ∙OH at C3-site and deprotonation by HO was validated as the energetically-favorable pathway that may cause dihydroxylation of BDE-47 into 3,4-dihydroxyl-BDE-17. The electrophilic addition followed by seconary barrierless trans-association of ∙OH and then dehydration seemed favorable for monohydroxylation as regards energetic barrier merely up to 194.01 kJ mol, while the hydrogen abstraction by ∙OH from C5-site was more privileged actually. The theoretical insights would help well understand the hydroxylation mechanism of PBDEs by aerobes.
Chenggang Gu, Xiuli Fan, Qingqing Ti, Xinglun Yang, Yongrong Bian, Cheng Sun, Xin Jiang

1981 related Products with: Mechanistic insight into hydroxylation of 2,2',4,4'-tetrabromodiphenyl ether during biodegradation by typical aerobic bacteria: Experimental and computational studies.

1 mg0.1 mg 100 G 1 kit(s) 1,000 tests200ug1 mg50 ug 25 mg0.1ml (1mg/ml)1000 tests

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#34491253   2021/09/07 To Up

Macrocycle-derived hierarchical porous organic polymers: synthesis and applications.

Porous organic polymers (POPs), as a new category of advanced porous materials, have received broad research interests owing to the advantages of light-weight, robust scaffolds, high specific surface areas and good functional tailorability. According to the long-range ordering of polymer skeletons, POPs can be either crystalline or amorphous. Macrocycles with inherent cavities can serve as receptors for recognizing or capturing specific guest molecules through host-guest interactions. Incorporating macrocycles in POP skeletons affords win-win merits, hierarchical porosity and novel physicochemical properties. In this review, we focus on the recent progress associated with new architectures of macrocycle-based POPs. Herein, these macrocycles are divided into two subclasses: non-planar (crown ether, calixarene, pillararene, cyclodextrin, cyclotricatechylene, ) and planar (arylene-ethynylene macrocycles). We summarize the synthetic methods of each macrocyclic POP in terms of the functions of versatile building blocks. Subsequently, we discuss the performance of macrocyclic POPs in environmental remediation, gas adsorption, heterogeneous catalysis, fluorescence sensing and ionic conduction. Although considerable examples are reported, the development of macrocyclic POPs is still in its infancy. Finally, we propose the underlying challenges and opportunities of macrocycle-based POPs.
Weiben Chen, Pei Chen, Guang Zhang, Guolong Xing, Yu Feng, Ying-Wei Yang, Long Chen

1075 related Products with: Macrocycle-derived hierarchical porous organic polymers: synthesis and applications.

10 mg100ul0.1mg500 MG100 Rxns Kit100 µg25 mg2ug0.1 mg96T200ug

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#34487797   2021/09/04 To Up

RIFM fragrance ingredient safety assessment, methyl vanillyl ether, CAS Registry Number 5533-03-9.


A M Api, D Belsito, D Botelho, M Bruze, G A Burton, J Buschmann, M A Cancellieri, M L Dagli, M Date, W Dekant, C Deodhar, A D Fryer, L Jones, K Joshi, M Kumar, A Lapczynski, M Lavelle, I Lee, D C Liebler, H Moustakas, M Na, T M Penning, G Ritacco, J Romine, N Sadekar, T W Schultz, D Selechnik, F Siddiqi, I G Sipes, G Sullivan, Y Thakkar, Y Tokura

2882 related Products with: RIFM fragrance ingredient safety assessment, methyl vanillyl ether, CAS Registry Number 5533-03-9.

100 G 1 G 5 G 100 G 100 G 1 G 5 G 1 G100 MG 25 G 1 G 100 G

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#34406745   2021/08/18 To Up

Parallel Coupling of Ion Mobility Spectrometry and Ion Trap Mass Spectrometry for the Real-Time Alarm Triggering and Identification of Hazardous Chemical Leakages.

Hazardous chemical leakages involved in chemical terrorist attacks and chemical industrial accidents have been posing severe threats to human health and the environment. Vehicle-mounted mass spectrometry (MS) has been developed for continuous, on-road measurements to map the spatial and temporal distributions of hazardous chemicals. However, the detection of chemicals with small temporal scales and spatial scales is always challenging. In this study, a parallel coupling apparatus combining the techniques of ion mobility spectrometry and ion trap MS (-IMS-ITMS) was developed to improve the detection rate and the time response capability of a stand-alone ITMS system for short time-span chemical tracking. A workflow was also proposed along with the apparatus, where the ITMS system can be triggered, as chemical suspects were discovered with the IMS system. The sampling positions of the ITMS system were investigated and optimized. In addition, a strategy was proposed to diminish the time span of samples from 1.5 to 0.5 s for evaluating the performances of the -IMS-ITMS system. The detection rate of the stand-alone ITMS system was measured to be only 9.5, 32, and 87.5% for the time span of 0.5, 1, and 1.5 s, respectively. By comparison, the detection rates of the -IMS-ITMS system were 99.5, 100, and 100%, where the detection rate was increased by a factor of 10 for 0.5 s time span. Moreover, the addition of an IMS system could provide temporal patterns of hazardous chemicals with a resolution of 33 ms. Finally, the potential of the -IMS-ITMS system for environmental navigation monitoring and assessment was further demonstrated by detecting the leakages of dimethyl methyl phosphonate and dipropylene glycol monomethyl ether.
Mei Li, Shuang Wang, Chuting Xu, Huiwen Ruan, Weiguo Wang, Chuang Chen, Haiyang Li

2337 related Products with: Parallel Coupling of Ion Mobility Spectrometry and Ion Trap Mass Spectrometry for the Real-Time Alarm Triggering and Identification of Hazardous Chemical Leakages.

255 mg0.1 mg200ug10 mg1000 tests25100ug 100 G25200ul

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#34364961   2021/08/05 To Up

RIFM fragrance ingredient safety assessment, vanillyl ethyl ether, CAS Registry Number 13184-86-6.


A M Api, D Belsito, D Botelho, M Bruze, G A Burton, J Buschmann, M A Cancellieri, M L Dagli, M Date, W Dekant, C Deodhar, A D Fryer, L Jones, K Joshi, M Kumar, A Lapczynski, M Lavelle, I Lee, D C Liebler, H Moustakas, M Na, T M Penning, G Ritacco, J Romine, N Sadekar, T W Schultz, D Selechnik, F Siddiqi, I G Sipes, G Sullivan, Y Thakkar, Y Tokura

1575 related Products with: RIFM fragrance ingredient safety assessment, vanillyl ethyl ether, CAS Registry Number 13184-86-6.

100 G 100 G 100 G 5 G 1 G 100 G 5 G 1 G 25 G 1 G 1 G 25 G

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#34324306   2021/07/29 To Up

Laser-Induced Corrugated Graphene Films for Integrated Multimodal Sensors.

Microstructures play a dominant role in flexible electronics to improve the performance of the devices, including sensitivity, durability, stretchability, and so on. However, the complicated and expensive fabrication process of these microstructures extremely hampers the large-scale application of high-performance devices. Herein, we propose a novel method to fabricate flexible graphene-based sensors with a 3D microstructure by generating laser-induced graphene (LIG) on the 3D printed polyether ether ketone corrugated substrate, which is referred to as CLIG. Based on that, two integrated piezoresistive sensors are developed to monitor the precise strain and pressure signals. Contributed to the 3D corrugated graphene structure, the sensitivities of strain and pressure sensors can be up to 2203.5 and 678.2 kPa, respectively. In particular, the CLIG-based strain sensor exhibits a high resolution to the microdeformation (small as 1 μm or 0.01% strain) and remarkable durability (15,000 cycles); meanwhile, the pressure sensor presents a remarkable working range (1-500 kPa) and fast response time (24 ms). Furthermore, the CLIG-based sensors provide a stable data source in the applications of human-motion monitoring, pressure array, and self-sensing soft robotic systems. High accuracy allows CLIG sensors to recognize more subtle signals, such as pulse, swallowing, gesture distinction of human, and movement status of soft robotics. Overall, this technology shows a promising strategy to fabricate high-performance sensors with high efficiency and low cost.
Qiushi Li, Tongyu Wu, Wei Zhao, Jiawen Ji, Gong Wang

2779 related Products with: Laser-Induced Corrugated Graphene Films for Integrated Multimodal Sensors.

1 G 2x5L 5 G0.1 mg1 mg50 ul500 ml100Tests96 Well100ug1 g

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#34303247   2021/07/18 To Up

Short- and medium-chain chlorinated paraffins in human blood serum of Czech population.

Short- and medium-chain chlorinated paraffins (SCCPs; MCCPs) are widespread environmental pollutants with bioaccumulation potential and adverse effects on human health. The analysis of blood serum is an important strategy to assess the human exposure to various contaminants, including SCCPs and MCCPs. Lately, the information about the exposure of Chinese population has been reported; nevertheless, data on human exposure to SCCPs and MCCPs outside East Asia are still very limited. In this pilot study, SCCPs and MCCPs were determined in 27 serum samples obtained from Czech adults. The samples were extracted by a three-step extraction (repeated with a clean solvent) by a mixture of n-hexane:diethyl ether (9:1, v/v) with subsequent clean-up on Florisil® solid phase extraction column. Gas chromatography coupled with high resolution mass spectrometry operated in negative chemical ionisation was employed for the instrumental analysis. The method recoveries ranged from 71 to 89% with repeatabilities of <20% (expressed as relative standard deviation). In the samples, SCCP concentrations were in the range of <150-2600 ng/g lipid weight, lw (median 370 ng/g lw) and the MCCP concentrations were in the range of <200-2110 ng/g lw (median 360 ng/g lw), respectively. To the best of our knowledge, our reported results are the first data about chlorinated paraffins in human blood serum in Europe, showing exposure to these compounds with yet to be studied effects on human health.
Jakub Tomasko, Michal Stupak, Denisa Parizkova, Andrea Polachova, Radim J Sram, Jan Topinka, Jana Pulkrabova

1955 related Products with: Short- and medium-chain chlorinated paraffins in human blood serum of Czech population.

5ml1 kit1mg96T 100 UG10 10ml2 96 wells (1 kit)100 μg1 ml4 Membranes/Box

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#34296857   2021/07/23 To Up

First Report on the Bioaccumulation and Trophic Transfer of Perfluoroalkyl Ether Carboxylic Acids in Estuarine Food Web.

As novel alternatives to legacy poly- and perfluoroalkyl substances (PFAS), perfluoroalkyl ether carboxylic acids (PFECAs) have been widely detected in the environment; however, there is limited information and knowledge regarding their bioaccumulation and trophic transfer behavior along the food chain. This research presents the first known published data on the bioaccumulation and trophic transfer characteristics of PFECAs in a source-impacted estuary. Elevated PFECA concentrations were observed in organisms (for instance, conch, with perfluoro-2-methoxyacetic acid (PFMOAA) concentration reaches up to 16 700 ng/g dry weight (dw)), indicating exposure risks to the consumers. Conch can be acted as a potential environmental bioindicator of PFMOAA. PFMOAA, hexafluoropropylene oxide trimer acid (HFPO-TrA) and PFOA were predominant detected in biotas. On the basis of trophic magnification factors (TMFs), PFECAs with ≥6 perfluorinated carbons (HFPO-TrA, hexafluoropropylene oxide tetramer acid (HFPO-TeA) and perfluoro (3, 5, 7, 9, 11-pentaoxadodecanoic) acid (PFO5DoA)) could be biomagnified along the food chain (TMF > 1), while PFMOAA with the least perfluorinated carbons undergone biodilution (TMF < 1). As seafood is an important dietary source of protein to human, there is a potential health risk related to the consuming polluted aquatic products.
Yanan Li, Jingzhi Yao, Jian Zhang, Yitao Pan, Jiayin Dai, Chenglong Ji, Jianhui Tang

1244 related Products with: First Report on the Bioaccumulation and Trophic Transfer of Perfluoroalkyl Ether Carboxylic Acids in Estuarine Food Web.

96 wells10 mg 25 G 1 G 1 G1 500 G

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#34291473   2021/07/22 To Up

Bikini textile contact dermatitis: A Sherlockian approach revealing 2.4-dichlorophenol as a potential textile contact allergen.

Different textile constituents may act as allergens and/or irritants and provoke textile contact dermatitis (TCD).
David Pesqué, Álvaro March-Rodriguez, Jakob Dahlin, Marléne Isaksson, Ramon M Pujol, Elena Giménez-Arnau, Ana M Giménez-Arnau

1659 related Products with: Bikini textile contact dermatitis: A Sherlockian approach revealing 2.4-dichlorophenol as a potential textile contact allergen.

100ug Lyophilized0.1mg100ug Lyophilized1 kit100ug10 plates100ug Lyophilized1000 units100ug Lyophilized100ug1 kit100ug Lyophilized

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#34182046   2021/06/25 To Up

RIFM fragrance ingredient safety assessment, vanillyl butyl ether, CAS Registry Number 82654-98-6.


A M Api, D Belsito, D Botelho, M Bruze, G A Burton, J Buschmann, M A Cancellieri, M L Dagli, M Date, W Dekant, C Deodhar, A D Fryer, L Jones, K Joshi, M Kumar, A Lapczynski, M Lavelle, I Lee, D C Liebler, H Moustakas, M Na, T M Penning, G Ritacco, J Romine, N Sadekar, T W Schultz, D Selechnik, F Siddiqi, I G Sipes, G Sullivan, Y Thakkar, Y Tokura

2503 related Products with: RIFM fragrance ingredient safety assessment, vanillyl butyl ether, CAS Registry Number 82654-98-6.

500 G 1 G5 mg 25 G 25 G 5 G100ML 5 G 5 G 5 G 5 MG 5 G

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