查找使用阿拉丁产品的科研文献

Electrochemical sensor for determination of bisphenol A based on MOF-reduced graphene oxide composites coupled with cetyltrimethylammonium bromide signal amplification

Wang Xue,Shi Yaru,Shan Jiajia,Zhou Hao,Li Mengjia

A sensitive electrochemical sensor was fabricated for the rapid determination of bisphenol A (BPA) based on cerium-centered metal-organic framework electrochemically reduced graphene oxide composite (Ce-MOF-ERGO) coupled with cetyltrimethylammonium bromide (CTAB) signal amplification. The Ce-MOF-ERGO was synthesized by electrochemical reduction of Ce-MOF-graphene oxide (GO) composite. Under the optimized conditions, the proposed electrochemical sensor exhibited a linear response for BPA in concentration range 3 nM to 10 μM with a detection limit of 1.9 nM. The excellent performance of the proposed sensor was attributed to the high conductivity, large surface area, and catalytic activity of Ce-MOF-ERGO composite. Moreover, the oxidation signals of BPA on Ce-MOF-ERGO-modified electrode were further enhanced significantly after addition of CTAB in electrolyte solution. Based on the dual signal amplification strategy, the sensor exhibited high sensitivity for BPA detection and was successfully applied to detect BPA in real samples with good recoveries.

Novel Mesoporous Cetyltrimethylammonium Bromide-Modified Magnetic Nanomaterials for Trace Extraction and Analysis of Bisphenol Endocrine Disruptors in Diverse Liquid Matrices

Yichao Gong,Yajing Guo,Qizhi Sun,Pengyan Liu

In this study, Fe 3 O 4 was used as a magnetic core, combined with the characteristics of mesoporous adsorbents, to prepare a novel magnetic mesoporous composite material named MMC. Cetyltrimethylammonium bromide (CTAB) and tetraethyl orthosilicate (TEOS) were used as functional monomers, and a simple etching method was employed. The resulting MMC was used as an effective adsorbent for the magnetic solid-phase extraction of trace residues of six bisphenol endocrine disruptors (bisphenol A, bisphenol B, bisphenol C, bisphenol F, bisphenol AF, and bisphenol AP) from environmental water and food samples. Characterization results indicated that the surface of MMC exhibited a distinct wormhole-like mesoporous structure, with the successful incorporation of CTAB functional groups and Si-OH. The crystal structure of Fe 3 O 4 remained stable throughout the preparation process. Mapping analysis confirmed the uniform distribution of CTAB functional groups without aggregation and demonstrated high magnetic intensity, enabling rapid separation and collection under an external magnetic field. Extraction and elution conditions were optimized, and tests were conducted for interfering substances such as humic acid, glucose, fructose, and sucrose under optimal parameters. The results showed that recovery rates were not significantly affected. The quality evaluation of the method demonstrated good linearity, a broad linear range, low limits of detection and quantification, and satisfactory recovery rates. Blank and spiked analyses were conducted for seven real samples, including environmental water (rivers and lakes) and food samples (dairy, juice, and carbonated beverages), with satisfactory spiked recovery rates achieved. Thus, the developed analytical method enables the analysis and detection of trace residues of various bisphenol pollutants in complex matrices, such as environmental water and food samples, providing a valuable reference for trace analysis of similar contaminants in complex matrices.

Cetyltrimethylammonium bromide assisted hydrothermal synthesis of cobalt oxide nanowires anchored on graphene as an efficient electrode material for supercapacitor applications

S.I. El-Hout,Chunlin Chen,Ting Liang,Longfei Yang,Jian Zhang

Cobalt oxide is a very promising material for supercapacitor with high theoretical specific capacitance . However, its poor cyclability resulting from the faradaic pseudocapacitive characteristics restricts its application. In this study, we employ an efficient strategy by introducing in-situ reduced graphene oxide to establish a porous conductive network for electron and ion transporting. A series composites of cobalt oxide nanowires supported on reduced graphene oxide are successfully synthesized with the assistance of cetyltrimethylammonium bromide by a facile hydrothermal method . The as-prepared composites are investigated by X-ray diffraction, Raman spectroscopy , X-ray photoelectron spectroscopy , Nitrogen physisorption , Scanning electron microscopy and Transmission electron microscopy , as well as electrochemical analysis in a three-electrode system. Remarkably, the composite exhibits a maximum specific capacitance of 531 F g −1 at a 0.1 A g −1 current density accompanying a 64% capacitance retention after 2000 cycles at a high current density of 10 A g −1 .

Extracting soluble lignin from poplar sawdust via ternary cetyltrimethylammonium bromide-based deep eutectic solvent pretreatment for the fabrication of biodegradable films

Xinyue Wang,Haojie Qian,Yucai He,Wei Tang

The multi-component deep eutectic solvents (DES) have emerged as indispensable tools in the lignocellulosic pretreatment process, facilitating the efficient biotransformation of biomass sugars into valuable products. In this investigation, FeCl 3 was ingeniously incorporated to amplify the pretreatment efficacy of a DES synthesized from cetyltrimethylammonium bromide (CTAB) and lactic acid (LA), specifically targeting poplar sawdust (PS). Remarkably, under the meticulously optimized molar ratio of 1: 4:1, this innovative ternary DES achieved an unprecedented removal of 68.2 % lignin and 99.9 % xylan from PS, thereby elevating the enzymatic hydrolysis efficiency from a modest 16.8 % to an impressive 78.9 %. Structural characterization unveiled that the strategic introduction of FeCl 3 into the CTAB:LA system not only enhanced the accessibility and crystallinity index of PS but also diminished the surface area occupied by lignin, effectively dismantling the intricate linkages and structural units of dissolved lignin. As a result, high-performance films imbued with UV resistance and antioxidant properties were successfully fabricated through the judicious blending of dissolved lignin with polylactic acid. This pioneering research not only underscores the unparalleled delignification prowess of CTAB as the most efficacious hydrogen bond acceptor in DES but also establishes a robust theoretical framework for the high-value utilization of ternary DES in biorefinery applications.

The design of aggregation-induced fluorescence sensor based on the cetyltrimethylammonium bromide-mediated nitrogen-doped carbon dots for selective detection of Hg2+

Yayun Ji,Xue Zou,Qiumeng Chen,Yulu Tian,Zhengjun Gong,Meikun Fan

This work reported an economical and sensitive fluorescence sensor for mercury (II) ions based on the cetyltrimethylammonium bromide-mediated nitrogen-doped carbon dots (NCDs). The NCDs, obtained by a solvothermal method, exhibit emission with low quantum yield (6%) that can be quenched by various ions such as Cu 2+ , Cr 6+ , Co 2+ , and Hg 2+ . After adding cetyltrimethylammonium bromide (CTAB), the two produced aggregation-induced fluorescence effect, coupled with electrostatic interaction , and the quantum yield increased to 32%. The spatial structure formed by CTAB/NCDs could selectively capture Hg 2+ and make interact with the surface groups of NCDs to cause fluorescence quenching. The fluorescence intensity and Hg 2+ concentration showed a linear response in the range of 0.15–1 mM and 0.16–10.24 μM (R 2  = 0.998), and the detection limit was 85.71 nM. The fluorescent sensor was used to determine Hg 2+ in environmental waters with satisfactory results.

The pH and temperature dual-responsive micelle transition in the mixture of hydrotrope potassium phthalic acid and quaternary ammonium surfactants cetyltrimethylammonium bromide

Cunchuan Zheng,Hongsheng Lu,Li Wang,Zhiyu Huang

Effects of Cetyltrimethylammonium Bromide on the Toxicity of Gold Nanorods Both In Vitro and In Vivo: Molecular Origin of Cytotoxicity and Inflammation

Yan Peng Jia,Kun Shi,Jin Feng Liao,Jin Rong Peng,Ying Hao,Ying Qu,Li Juan Chen,Li Liu,Xia Yuan,Zhi Yong Qian,Xia Wei Wei

The safety issues and immunological effects of nanosized materials have drawn considerable attention. Gold nanorods (Au NRs) have promising applications in biomedical diagnosis and therapy, but their biosafety and the mechanism underlying in vivo toxicity still remain to be explored. In this study, cetyltrimethylammonium bromide (CTAB) capped Au NRs and PEG modified Au NRs are both prepared, the cytotoxicity evaluation indicates that CTAB-Au NRs of different ratios all exhibit cytotoxicity while PEG-Au NRs show improved biocompatibility. Furthermore, it is investigated how the surface characteristics influence toxical effects of Au NRs both in vitro and in vivo. It is found that CTAB-Au NRs can induce acute cell necrosis, which results in the leakage of damage associated molecular patterns (DAMPs) such as mitochondrial DNA (mtDNA), subsequently triggering pulmonary inflammation. It is also revealed that the inflammation caused by CTAB-Au NRs is probably mediated by the stimulator of interferon genes (STINGs) signaling pathway. This study explores the cytotoxicity and inflammatory toxicity of CTAB-Au NRs, and how the surface modification affects the toxicity. The molecular pathways for the induction of pulmonary inflammation in vivo are further characterized. These findings might be of importance for designing safer and better gold-based nanomaterials in the future.

Simultaneous determination of cyanide and thiocyanate in milk by GC-MS/MS using cetyltrimethylammonium bromide as both phase transfer catalyst and protein precipitant

Xing Li,Yongyan Ji,Tiehong Zu,Xuezhe Huang,Jing Wang,Yanzhong Cao,Zongyan Cui

A method was developed for simultaneous determination of cyanide and thiocyanate in milk by gas chromatography-tandem quadrupole mass spectrometry (GC-MS/MS). Cyanide and thiocyanate were derivatized with pentafluorobenzyl bromide (PFBBr) as PFB-CN and PFB-SCN, respectively. Cetyltrimethylammonium bromide (CTAB) was employed both as a phase transfer catalyst and a protein precipitant in the sample pretreatment, which facilitates the separation of the organic and aqueous phases, and greatly simplifies the pretreatment procedures to achieve simultaneous and rapid determination of cyanide and thiocyanate. Under the optimized conditions, the limits of detection (LODs) of cyanide and thiocyanate in milk were 0.006 mg/kg and 0.015 mg/kg, and the spiked recoveries ranged from 90.1% to 98.2% and from 91.8% to 98.9% with relative standard deviations (RSDs) less than 18.9% and 15.2%, respectively. The proposed method was validated as a simple, fast and highly sensitive method for the determination of cyanide and thiocyanate in milk.

A reduced graphene oxide-Fe3O4 composite functionalized with cetyltrimethylammonium bromide for efficient adsorption of SARS-CoV-2 spike pseudovirus and human enteric viruses

Shuqing Zhou,Min Jin,Rong Tan,Zhiqiang Shen,Jing Yin,Zhigang Qiu,Zhengshan Chen,Danyang Shi,Haibei Li,Zhongwei Yang,Huaran Wang,Zhixian Gao,Junwen Li,Dong Yang

The latent dangers of waterborne viral transmission have become a major public health concern. In this study, reduced graphene oxide (rGO)-Fe 3 O 4 nanoparticles were decorated with cetyltrimethylammonium bromide (CTAB) to adsorb severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) spike pseudovirus and three human enteric viruses (HuNoV, HRV, and HAdV). The successful combination of CTAB with rGO-Fe 3 O 4 was confirmed by transmission electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, zeta potential, Brunner-Emmet-Teller, and vibrating sample magnetometer measurements. The adsorption of HuNoV and HAdV followed pseudo-first-order kinetics, while that of HRV conformed to the pseudo-second-order model. CTAB-functionalized rGO-Fe 3 O 4 exhibited exceptionally high adsorption of HuNoV, HRV, HAdV and SARS-CoV-2 spike pseudovirus, with maximum adsorption capacities of 3.55 × 10 7 , 7.01 × 10 7 , 2.21 × 10 7 and 6.92 × 10 6 genome copies mg −1 , respectively. Moreover, the composite could effectively adsorb the four types of virus particles from coastal, tap, and river water. In addition, concentrating the virions using CTAB functionalized rGO-Fe 3 O 4 composites before qPCR analysis significantly improved the detection limit. The results indicate that viruses are captured on the surface of CTAB functionalized rGO-Fe 3 O 4 composites through electrostatic interactions and the intrinsic adsorption ability of rGO. Overall, CTAB-functionalized rGO-Fe 3 O 4 composites are promising materials for the adsorption and detection of human enteric viruses as well as SARS-CoV-2 from complex aqueous environments.

Natural enzyme-free colorimetric immunoassay for human chorionic gonadotropin detection based on the Ag+-triggered catalytic activity of cetyltrimethylammonium bromide-coated gold nanoparticles

Yuqian Guo,Yaofeng Zhou,Sicheng Xiong,Lifeng Zeng,Xiaolin Huang,Yuankui Leng,Yonghua Xiong

The usage of nanozyme as label to establish immunoassays offers merits of low cost and high robustness. However, the catalytic activity of nanozyme is usually passivized by the modified layer of bio-recognition molecules. The peroxidase-mimicking activity of cetyltrimethylammonium bromide (CTAB)-coated gold nanoparticles (AuNPs@CTAB) is recovered by Ag + ions. Herein, AuNPs@CTAB with Ag + -triggered catalytic activity was first designed as signal transducer to construct colorimetric immunoassay for human chorionic gonadotropin (HCG) detection. Silver nanoparticles were used as labels which can release numerous Ag + ions by hydrogen peroxide corrosion and thus enhance the catalytic activity of AuNPs@CTAB. To achieve the highest detection sensitivity, we synthesized three kinds of AuNPs@CTAB with similar size but different shapes including nanospheres (AuNSs@CTAB), nanorods (AuNRs@CTAB), and nanocubes (AuNCs@CTAB). The morphology-dependent catalytic properties of AuNPs@CTAB were evaluated. Under optimum conditions, the proposed method using AuNSs@CTAB, AuNRs@CTAB and AuNCs@CTAB using AuNSs@CTAB, AuNRs@CTAB and AuNCs@CTAB gave LOD of 7.8, 15.6 and 31.2 mIU/mL, respectively. The developed immunoassays also showed good accuracy, high reproducibility and high robustness for detecting HCG in serum samples. In summary, the developed immunoassay is a promising bioanalysis platform which can provide similar sensitivity and enhanced robustness compared with traditional horse radish peroxidase-based immunoassays.

Preparation of a highly sensitive and selective modified electrode for imidacloprid determination based on a nanocomposite cetyltrimethylammonium bromide–functionalized graphene oxide/multi-walled carbon nanotubes

Han Jia-Jun,Ma Li-Ping,Liu De-Li,Wang Yan-Fang

An electrochemical sensor based on cetyltrimethylammonium bromide–functionalized graphene oxide/multi-walled carbon nanotube (CTAB-GO/MWCNTs)nanocomposite–modified glassy carbon electrodes was designed for use in rapid detection of imidacloprid (IMD) in agricultural products. Field emission scanning electron microscopy (FE-SEM) and X-ray diffractometer (XRD) were used to elucidate the surface features of CTAB-GO/MWCNT nanocomposites. Electrochemical studies were performed using two methods, including cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Under the optimized experimental conditions, the peak current responds linearly with concentration (1.0–13.0 μM) with a limit of detection (LOD) of 0.144 μM. The sensor has good selectivity, reproducibility, and stability. The sensor was used to detect IMD in actual samples, and the recovery rate was 97.7– 101.5%, which proved the feasibility of the determination method and provided an effective way for efficient monitoring of IMD in agriculture.

Cobalt-doped nanoporous carbon as SALDI-TOF-MS adsorbent and matrix for quantification of cetyltrimethylammonium bromide, Rhodamine B and Malachite Green at sub-ppt levels

Zhen Deshuai,Jiang Ning,Geng Hongchao,Qiao Yan,Liu Yu,Zhu Xingqi,Gao Chan,Grimes Craig A.,Cai Qingyun

Cobalt-doped nanoporous carbon (Co-NPC) with dodecahedral shape was pyrolytically synthesized and applied as a sorbent and matrix for the enrichment and analysis of small molecules by surface-assisted laser desorption/ionization time-of-flight mass spectrometry (SALDI-TOF MS). Extremely low detection limits were accomplished for cetyltrimethylammonium bromide (1 fg·mL −1 ), and Rhodamine B (1 fg·mL −1 ) in water, and Malachite Green and its metabolite in fish blood and fish extracts (pg·mL −1 concentrations). Schematic representation of cobalt-doped nanoporous carbons (Co-NPCs) applied as SALDI matrix for analysis of toxic contaminants in fish and receipt papers. The Co-NPCs have a high desorption/ionization efficiency and low limit of detection.