Tag: 300-400

Effect of a cationic surfactant on the volatilization of PAHs from soil was written by Lu, Li;Zhu, Lizhong. And the article was included in Environmental Science and Pollution Research in 2012.Category: pyridine-derivatives This article mentions the following:

Cationic surfactants are common in soils because of their use in daily cosmetic and cleaning products, and their use as a soil amendment for the mitigation and remediation of organic contaminated soils has been proposed. Such surfactant may affect the transfer and fate of organic contaminants in the environment. This study investigated the effect of a cationic surfactant, dodecylpyridinium bromide (DDPB), on the volatilization of polycyclic aromatic hydrocarbons (PAHs) from a paddy soil. The volatilization of PAHs from moist soil amended with different concentrations of DDPB was tested in an open system. The specific effects of DDPB on the liquid-vapor and solid-vapor equilibrium of PAHs were sep. investigated in closed systems by headspace anal. DDPB affects both liquid-vapor and solid-vapor processes of PAHs in soil. At DDPB concentrations below the critical micelle concentration (CMC), movement of PAHs from the bulk solution to the gas-liquid interface appeared to be facilitated by interaction between PAHs and the surfactant monomers adsorbed at the gas-liquid interface, promoting the volatilization of PAHs from solution However, when DDPB was greater than the CMC, volatilization was inhibited due to the solubilization of PAHs by micelles. On the other hand, the formation of sorbed surfactant significantly inhibited the solid-vapor volatilization of PAHs. The overall effect of the two simultaneous effects of DDPB on liquid-vapor and solid-vapor processes was a decreased volatilization loss of PAHs from soil. Inhibition of PAH volatilization was more significant for the soil with a lower moisture content. In the experiment, the researchers used many compounds, for example, 1-Dodecylpyridin-1-ium bromide (cas: 104-73-4Category: pyridine-derivatives).

1-Dodecylpyridin-1-ium bromide (cas: 104-73-4) belongs to pyridine derivatives. Pyridines are an important class of heterocycles and occur in polysubstituted forms in many naturally occurring biologically active compounds, drug molecules and chiral ligands. Pyridine groups exist in countless molecules, and their applications include catalysis, drug design, molecular recognition, and natural product synthesis.Category: pyridine-derivatives

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In-syringe magnetic stirring assisted dispersive liquid-liquid micro-extraction with solvent washing for fully automated determination of cationic surfactants was written by Horstkotte, Burkhard;Suarez, Ruth;Solich, Petr;Cerda, Victor. And the article was included in Analytical Methods in 2014.Quality Control of 1-Dodecylpyridin-1-ium bromide This article mentions the following:

An automated simple analyzer system for the extraction of cationic surfactants as an ion-pair with disulfine blue dye is described based on the technique in-syringe magnetic stirring-assisted dispersive liquid-liquid micro-extraction The use of chloroform as an extraction solvent denser than water required the operation of the syringe pump upside-down. The remaining air cushion inside the syringe allowed emptying the syringe completely and reducing the dead volume significantly compared to previous studies. Since the stirring bar placed inside the syringe to obtain a closed yet size-adaptable mixing chamber remains at the same position, the former magnetic stirring bar driver was simplified. The new system configuration further enabled automated in-syringe washing of the organic phase with water and barium acetate solution to minimize interference. High signal repeatability with <5% RSD was achieved both for extraction as well as for double organic phase washing. Only 220 μL of the extraction solvent and 4 mL of the sample were required for simple extraction achieving a detection limit below 30 nmol L^-1 and a linear response up to 1 μmol L^-1 of cetyltrimethylammonium bromide. The time of anal. was 240 s for simple extraction Considerable reduction of interference was achieved by extract washing up to 545 s. Analyte recovery in real water samples was 95.6 ± 7.0% on applying extract washing. In the experiment, the researchers used many compounds, for example, 1-Dodecylpyridin-1-ium bromide (cas: 104-73-4Quality Control of 1-Dodecylpyridin-1-ium bromide).

1-Dodecylpyridin-1-ium bromide (cas: 104-73-4) belongs to pyridine derivatives. Pyridines are an important class of heterocycles and occur in polysubstituted forms in many naturally occurring biologically active compounds, drug molecules and chiral ligands. Halopyridines are particularly attractive synthetic building blocks in a variety of cross-coupling methods, including the Suzuki-Miyaura cross-coupling reaction.Quality Control of 1-Dodecylpyridin-1-ium bromide

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Evaluation of amphiphilic properties of fulvic acid and humic acid by alkylpyridinium binding study was written by Yee, Min Min;Miyajima, Tohru;Takisawa, Noboru. And the article was included in Colloids and Surfaces, A: Physicochemical and Engineering Aspects in 2006.HPLC of Formula: 104-73-4 This article mentions the following:

Amphiphilic properties of Aso fulvic acid (AFA) and Aso humic acid (AHA) were evaluated through a study on the binding of N-alkylpyridinium bromide (C_nPy⁺Br^–, n = 12, 14 and 16), with a potentiometric titration method with surfactant-ion-selective membrane electrodes in aqueous solution of pH 9.18 and ionic strength of 0.03 M at 25°. Different binding behaviors were observed between AFA and AHA due to the differences in the d. of carboxylate groups as well as hydrophobicity-hydrophilicity balance. Independent sites binding behavior was observed in the C_nPy⁺-AHA system; however, cooperative binding was observed in C_nPy⁺-AFA system. The binding of C_nPy⁺ to AHA was stronger than that to AFA, reflecting the importance of hydrophobic interaction between surfactant mols. and the backbone of AHA mols. The chain length dependence of the free energy of binding per CH₂ group amounted to about 3.1 kJ/mol in C_nPy⁺-AFA system, which is comparable to C_nPy⁺ binding to dextran sulfate, and that for the C_nPy⁺-AHA system was 2.3 kJ/mol. In the experiment, the researchers used many compounds, for example, 1-Dodecylpyridin-1-ium bromide (cas: 104-73-4HPLC of Formula: 104-73-4).

1-Dodecylpyridin-1-ium bromide (cas: 104-73-4) belongs to pyridine derivatives. Pyridine is diamagnetic and has a diamagnetic susceptibility of −48.7 × 10−6 cm3·mol−1.The molecular electric dipole moment is 2.2 debyes. The standard enthalpy of formation is 100.2 kJ·mol−1 in the liquid phase and 140.4 kJ·mol−1 in the gas phase. Pyridine groups exist in countless molecules, and their applications include catalysis, drug design, molecular recognition, and natural product synthesis.HPLC of Formula: 104-73-4

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Mixed surfactant systems. Part 1: micelle formation from mixtures of polyoxyethylene t-octylphenol and cationic surfactants was written by Varade, D.;Mody, S.;Ankleshwaria, H.;Bahadur, P.. And the article was included in Tenside, Surfactants, Detergents in 2003.SDS of cas: 104-73-4 This article mentions the following:

The critical micelle concentrations (c.m.c.) for the binary combinations of a nonionic surfactant polyoxyethylene t-octylphenol (TX-100) with nine cationic surfactants (varying in mol. characteristics) at different mole fractions in aqueous solutions, obtained by surface tension measurements, were analyzed using Rubingh’s regular solution theory. The values of interaction parameter (β) show marked interaction for cationic-nonionic systems. The cloud point of TX-100 increased remarkably in presence of trace amount of cationic surfactants. The magnitude of interaction and the increase in the cloud point of TX-100 solution is discussed in terms of nonpolar tail, polar head group size, and the size/polarizability of counter ions. Viscosity and conductance results support the interaction between cationic surfactants and TX-100 in water. In the experiment, the researchers used many compounds, for example, 1-Dodecylpyridin-1-ium bromide (cas: 104-73-4SDS of cas: 104-73-4).

1-Dodecylpyridin-1-ium bromide (cas: 104-73-4) belongs to pyridine derivatives. Pyridine’s the lone pair does not contribute to the aromatic system but importantly influences the chemical properties of pyridine, as it easily supports bond formation via an electrophilic attack. Pyridine derivatives are also useful as small-molecule α-helix mimetics that inhibit protein-protein interactions, as well as functionally selective GABA ligands.SDS of cas: 104-73-4

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Weak binding of N-alkylpyridinium ions to nonionic surfactant micelles as studied by capillary zone electrophoresis was written by Takayanagi, Toshio;Ikuta, Ayumi;Motomizu, Shoji. And the article was included in Analytical Sciences in 2010.Application of 104-73-4 This article mentions the following:

The binding equilibrium of N-alkylpyridinium ions to nonionic surfactant micelles was investigated through the changes in the electrophoretic mobility of the alkylpyridinium ions in capillary zone electrophoresis. The binding constants thus determined increased with increasing mol. volume of the alkylpyridinium ions. However, the binding constants are small compared with the ones for the anionic alkylbenzenesulfonate and polynitrophenolate ions at the same mol. volume In the experiment, the researchers used many compounds, for example, 1-Dodecylpyridin-1-ium bromide (cas: 104-73-4Application of 104-73-4).

1-Dodecylpyridin-1-ium bromide (cas: 104-73-4) belongs to pyridine derivatives. The ring atoms in the pyridine molecule are sp2-hybridized. The nitrogen is involved in the π-bonding aromatic system using its unhybridized p orbital. The lone pair is in an sp2 orbital, projecting outward from the ring in the same plane as the σ bonds. Several pyridine derivatives play important roles in biological systems. While its biosynthesis is not fully understood, nicotinic acid (vitamin B3) occurs in some bacteria, fungi, and mammals.Application of 104-73-4

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Effect of soil components on the surfactant-enhanced soil sorption of PAHs was written by Lu, Li;Zhu, Lizhong. And the article was included in Journal of Soils and Sediments in 2012.Electric Literature of C17H30BrN This article mentions the following:

The use of cationic surfactants was proposed to enhance the soil retention of hydrophobic organic contaminants (HOCs). However, due to the complexity of soil composition, the effect of cationic surfactants on the soil sorption of HOCs was limited to a qual. understanding. To gain further insight into the mechanism of the surfactant and predict its efficiency, a comparative study on the HOCs sorption capacities of the surfactants sorbed on pure typical soil components was studied. The sorption of cationic surfactant onto 5 pure typical soil components and the sorption of polycyclic aromatic hydrocarbons (PAHs) by the sorbed surfactant were conducted using batch equilibration methods. Humic acid (HA) and quartz were chosen as the representatives of organic matter and sand, resp. Montmorillonite, kaolinite, and illite were chosen as representatives of clay minerals. The cationic surfactant sorption capacities of different soil components were of great difference, and the PAH sorption capacities of the surfactant sorbed onto different components were also very different. Aside from the clay minerals, HA was a very active adsorbent for the cationic surfactant, and the sorption mechanism included both adsorption and partition-like processes. For each pure soil component and a certain PAH, a proximately piecewise function was found to describe the relation of surfactant-normalized PAH distribution coefficient K_sf and the sorption amount of the surfactant on solid Q_e-DDPB (R > 0.9). As a result, the sorption of PAHs by different soil components with certain surfactant loading can be estimated The effect of soil organic matter such as HA could not be ignored when predicting the soil sorption of cationic surfactants. The PAH partition capacities of the sorbed surfactant on HA or clay minerals were very different. However, for each pure soil component, the K _sf value was specifically related with the surfactant loading, which provided a possible means of predicting the efficiency of the cationic surfactant in enhancing the sorption of PAHs onto soils. In the experiment, the researchers used many compounds, for example, 1-Dodecylpyridin-1-ium bromide (cas: 104-73-4Electric Literature of C17H30BrN).

1-Dodecylpyridin-1-ium bromide (cas: 104-73-4) belongs to pyridine derivatives. In contrast to benzene, Pyridine’s electron density is not evenly distributed over the ring, reflecting the negative inductive effect of the nitrogen atom. Several pyridine derivatives play important roles in biological systems. While its biosynthesis is not fully understood, nicotinic acid (vitamin B3) occurs in some bacteria, fungi, and mammals.Electric Literature of C17H30BrN

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Mixed micelles of n-alkylpyridinium bromide and Triton X-100 in aqueous media was written by Parihar, Shailendra Kumar;Goswami, Ashok K.. And the article was included in International Journal of Chemical Sciences in 2008.Product Details of 104-73-4 This article mentions the following:

The mixed micellization process of binary mixtures formed by n-alkylpyridinium bromide including tetradecylpyridinium bromide (C₁₄PB), dodecylpyridnium bromide (C₁₂PB), decylpyridinium bromide (C₁₂PB) and tert-octylphenylpolyoxyethylene ether (Triton X-100) was examined, by surface tension method. The mixed CMC (C*) values were determined and in all cases a neg. deviation from the ideal behavior was observed However, the interaction parameter (β) as given by regular solution theory (RST) was found to be dependent on the micellar composition In the experiment, the researchers used many compounds, for example, 1-Dodecylpyridin-1-ium bromide (cas: 104-73-4Product Details of 104-73-4).

1-Dodecylpyridin-1-ium bromide (cas: 104-73-4) belongs to pyridine derivatives. Pyridines are an important class of heterocycles and occur in polysubstituted forms in many naturally occurring biologically active compounds, drug molecules and chiral ligands. Many analogues of pyridine are known where N is replaced by other heteroatoms . Substitution of one C–H in pyridine with a second N gives rise to the diazine heterocycles (C4H4N2), with the names pyridazine, pyrimidine, and pyrazine.Product Details of 104-73-4

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

A general method for the separation of amphiphilic surface-active poly(ethylene glycol) mono- and di-esters with long-chain ionic liquid-based biphasic systems was written by Kong, Liyun;Yang, Qiwei;Xing, Huabin;Su, Baogen;Bao, Zongbi;Zhang, Zhiguo;Yang, Yiwen;Ren, Qilong. And the article was included in Green Chemistry in 2014.Name: 1-Dodecylpyridin-1-ium bromide This article mentions the following:

A new method for the effective separation of amphiphilic poly(ethylene glycol) mono- and di-esters with long-chain ionic liquid-based biphasic systems has been developed. These biphasic systems exhibited high selectivity, a large distribution coefficient and a good ability to eliminate the emulsification resulting from the surface active character of those amphiphilic mols. In the experiment, the researchers used many compounds, for example, 1-Dodecylpyridin-1-ium bromide (cas: 104-73-4Name: 1-Dodecylpyridin-1-ium bromide).

1-Dodecylpyridin-1-ium bromide (cas: 104-73-4) belongs to pyridine derivatives. In contrast to benzene, Pyridine’s electron density is not evenly distributed over the ring, reflecting the negative inductive effect of the nitrogen atom. Halopyridines are particularly attractive synthetic building blocks in a variety of cross-coupling methods, including the Suzuki-Miyaura cross-coupling reaction.Name: 1-Dodecylpyridin-1-ium bromide

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Cation isomerism effect on micellization of pyridinium based surface-active ionic liquids was written by Cobanov, Isidora;Sarac, Bojan;Medos, Ziga;Tot, Aleksandar;Vranes, Milan;Gadzuric, Slobodan;Bester-Rogac, Marija. And the article was included in Journal of Molecular Liquids in 2021.Category: pyridine-derivatives This article mentions the following:

In this study, four pyridinium-based surface-active ionic liquids (SAILs) with small changes in the cation structure were synthesized, namely N-dodecylpyridinium bromide, N-dodecyl-2-methylpyridinium bromide, N-dodecyl-3-methylpyridinium bromide, and N-dodecyl-4-methylpyridinium bromide. Their micellization behavior in aqueous solutions was investigated by isothermal titration calorimetry (ITC) in the temperature range between 278.15 K and 318.15 K. The exptl. ITC data were analyzed by applying an improved mass-action model, which provides the values for the critical micelle concentration (cmc), the degree of counterion binding (β), the average aggregation number (n), and the standard heat capacity (Δ_Mc_p^θ), enthalpy (Δ_MH^θ), entropy (Δ_MS^θ) and Gibbs free energy (Δ_MG^θ). Only minor differences were observed for the values of Δ_MH^θ, Δ_MS^θ and Δ_MG^θ, while some significant differences were found for the values of the average aggregation number (n) and Δ_Mc_p^θ. From MD simulations it was found that the presence of the Me group on ortho-, meta- or para- position significantly affects the water organization around the pyridinium ring. Moreover, the hydration of the para-isomer is most pronounced and the hydration shell on this cation may also prevent the monomers from approaching each other. On the other hand, it turned out that the ortho-substituted pyridinium based SAIL has the most neg. value of Δ_Mc_p^θ, which can be ascribed to the partial dehydration of the Me group on the ortho- position during micelle formation. In contrast, for other systems, the alkyl chain was found to be mainly dehydrated while the pyridinium ring remains completely in contact with water even upon micellization. In the experiment, the researchers used many compounds, for example, 1-Dodecylpyridin-1-ium bromide (cas: 104-73-4Category: pyridine-derivatives).

1-Dodecylpyridin-1-ium bromide (cas: 104-73-4) belongs to pyridine derivatives. Pyridines are an important class of heterocycles and occur in polysubstituted forms in many naturally occurring biologically active compounds, drug molecules and chiral ligands. Halopyridines are particularly attractive synthetic building blocks in a variety of cross-coupling methods, including the Suzuki-Miyaura cross-coupling reaction.Category: pyridine-derivatives

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Nucleophilic Substitution in Carboxylic Esters in Oil-In-Water Microemulsions was written by Mirgorodskaya, A. B.;Kudryavtseva, L. A.. And the article was included in Russian Journal of General Chemistry (Translation of Zhurnal Obshchei Khimii) in 2002.Safety of 1-Dodecylpyridin-1-ium bromide This article mentions the following:

In hydrolysis and aminolysis of p-nitrophenyl esters of carboxylic acids in oil-in-water microemulsions on the basis of surfactants of various nature, a complex mechanism of the effect of the medium is operative, including shift of acid-base equilibrium in the nucleophile. The rate constants of the processes studied are quant. related to the surface potential of the microdroplet. Varied hydrophobicity of the nucleophile and substrate changes the site of the reaction act and the relative contributions of aminolysis and hydrolysis. In the experiment, the researchers used many compounds, for example, 1-Dodecylpyridin-1-ium bromide (cas: 104-73-4Safety of 1-Dodecylpyridin-1-ium bromide).

1-Dodecylpyridin-1-ium bromide (cas: 104-73-4) belongs to pyridine derivatives. Pyridine has a conjugated system of six π electrons that are delocalized over the ring. The molecule is planar and, thus, follows the Hückel criteria for aromatic systems. Halopyridines are particularly attractive synthetic building blocks in a variety of cross-coupling methods, including the Suzuki-Miyaura cross-coupling reaction.Safety of 1-Dodecylpyridin-1-ium bromide

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem