Brij 3 5 polyoxyethylene lauryl ether

In these studies, the system water/Brij 30 (polyoxyethylene lauryl ether with an average of 4mol ethylene oxide/decane) was chosen as a model to obtain O/W emulsions. The results showed that nanoemulsions with droplet sizes on the order of 50 nm were formed only when water was added to mixtures of surfactant and oil (method B), whereby an inversion from a W/O emulsion to an O/W nanoemulsion occurred. 

In SPE, a small amount of organic solvent or surfactant is added to collected samples to prevent adsorption to sample containers. To increase recoveries of ng 1 levels of PAHs in SPE, ACN (40%) or surfactants above their CMC can be added to samples prior to preconcentration. Solid supports, chemically modified with copper phthalocyanine trisulfonic acid derivatives for selective sorption of PAHs, have been investigated. The selective interaction is thought to be with the tt electrons of the PAHs. Brij-35, a neutral polyoxyethylene lauryl ether surfactant was added above the CMC to water samples to prevent sorption on container walls. Before preconcentration by SPE, samples were diluted to reduce the surfactant concentration to just below the CMC. Recoveries of over 90% for SPE on solids containing copper phthalocyanine trisulfonic derivatives were obtained for spiked water samples at low ngl levels, except for NAP, ACE, and FLU. Experiments repeated using a C18 SPE preconcentration sorbent gave >90% recovery for all 16 EPA PAHs, except for ACY. Examples of the use of SDB as an SPE sorbent include the online analysis of seawater from the coast of Catalonia in Spain, where no PAHs above the low ng 1 level were detected, and the analysis of leachate from coal deposits. ... 

From Diaz et al. (2003). Emulsion was prepared with 5% corn oil and 95% 10 mM imidazole-acetate buffer (pH 7.0), using 17 mM Brij 35 (polyoxyethylene lauryl ether) as emulsifier. Casein hydrolysates (91 P/N, ug/mg) were obtained by trypsin hydrolysis of casein (52 P/N /tg/mg), and 86% enriched caseinophophopeptides (237 P/N /.iglmg) were prepared by precipitation of casein hydrolysates with CaClj and ethanol. 

Self-diffusion NMR is being applied more and more in the characterization of MEs and a few examples wiU be given in the following paragraph. Biruss et al. investigated an ME consisting of 22% (w/w) polyoxyethylene lauryl ether (Brij-30), 22% (w/w) ethanol, 45% (w/w) eucalyptus oil and 10% (w/w) distilled water for the topical delivery of various hormonal drugs [76]. 

Asgher et al. (2011b) have also reported another FI-CL method to determine retinol and a-tocopherol in pharmaceuticals and human blood serum based on the enhancement effect of the lucigenin CL reaction in alkaline medium. Surfactants including polyoxyethylene lauryl ether (Brij-35), Triton X-100, cetyltrimethyl ammonium bromide (CTAB) and sodium dodecyl sulfate (SDS) enhance lucigenin CL intensity. With Brij-35, the enhancement was 67% for retinol and 58% for a-tocopherol. With CTAB, the enhancement was 16% for retinol whereas for a-tocopherol, the CL intensity was quenched by up to 95%. Retinol could be determined specifically in the presence of a-tocopherol using CTAB. 

Other polyoxyethylated glycol monoethers are commercially available as the Brij series (Atlas) which includes polyoxyethylene lauryl ethers (Brij 30, 35) cetyl ethers (Brij 52, 56, 58), stearyl ethers (Brij 72, 76, 78) and oleyl ethers (Brij 92, 96,98). 

A wider range of 34 benzoic acid derivatives has been studied in detail by Tomida et al. [27]. Using a solubility method these workers obtained saturation solubilities of the benzoic acid derivatives in Brij 35 (a polyoxyethylene lauryl ether) over a range of concentrations. Solubility ratios, calculated as the solubility in the surfactant solution/solubility in HCl, were a linear function of surfactant concentration allowing the calculation of a partition coefficient Pm which can be defined as... 

Figure D3.5.6 Adsorption kinetics of a small molecule surfactant. Surface tension of polyoxyethylene (10) lauryl ether (Brij) at the air-water interface decreases as time of adsorption increases. Brij concentration is 0.1 g/liter, as measured by the drop volume technique and the maximum bubble pressure method (UNITD3.6).

All density gradient separations are carried out in aqueous cesium chloride solutions to which a nonionic surfactant has been added (polyoxyethylene-23-lauryl ether, Brij-35). The surfactant is necessary to disperse the fine coal particles in the aqueous medium. Without complete particle dispersion the separation will most likely not be optimal. 

SDS, sodium dodecyl sulfate CTAB, cetyltrimeihylammonium bromide Brij-35. polyoxyethylene-23-lauryl ether sulfobetaine, A/-dodccyl-A/,A/-dimethyl-ammonium-3-propune I sulfonic ncld. 

SDS sodium dodecyl sulfate HDTC1 hexadecyltrimethylammonium chloride HDTBr hexadecyltrimethylammonium bromide Brij 35 polyoxyethylene (23) lauryl ether DTAC dodecyltrimethylammonium chloride TTAC1 tetradecyltrimethylammonium chloride HDPB hexadecylpyridinium bromide KDC potassium decanoate SPFO sodium perfluorooctanoate KTC potassium tetradecanoate... 

Polyoxyethylene-9-lauryl ether (laureth-9), Brij 35, Brij 96, polysorbate 80, quillaja saponin, dodecylmaltoside Na glycocholate, Na taurocholate, Na deoxycholate,... 

Brij-35 [polyoxyethylene (23) lauryl ether] stabilized palladium nanoparticles, obtained on attempted sonochemical reduction of PdCl2, by sodium sulfite in water... 

Type A emulsions contain one large internal droplet similar to that described by Matsumoto et al. [2]. This type was produced when polyoxyethylene (EO = 4) lauryl ether (Brij 30) was used as emulsifier at 2%. 

Gluten was obtained from ProVim, a gluten-enriched flour, by a conventional dough-and-wash procedure (16). Gliadin was separated from the gluten by the method of Jones et al. (17). The surfactants selected for study were Myrj 45 [polyoxyethylene (8) stearate], Tween 60 [polyoxyethylene (20) sorbitan monostearate], Brij 35 [polyoxyethylene (23) lauryl ether], Brij 76 [polyoxyethylene (10) stearyl ether], Brij 78 [polyoxyethylene (20) stearyl ether], and calcium stearoyl-2-lactylate. (Note that the numbers in parentheses indicate the number of monomer units of ethylene oxide.) Working solutions were made up in 70% ethanol at 2.5 mg per 100 ml solution. 

A simple but illustrative example is the combination of phenethyl alcohol with water and a nonionic surfactant polyoxyethylene (4) lauryl ether (BRIJ 30). Figure 2 shows the W/O microemulsion region to be in equilibrium with a lamellar liquid crystal and a dilute aqueous solution of the fragrance for a large part of the entire phase diagram. This means that the vapor pressure of the phenethyl alcohol remains constant during evaporation as long as the total composition remains within the area ABC of Fig. 2. 

Three types of multiple emulsions may be distinguished [16] (Figure 12.11). This classification is based on the predominance of the multiple emulsion droplet type. Using isopropyl myristate as the oil phase, 5% Span 80 to prepare the primary W/O emulsion, and various surfactants to prepare the secondary emulsion, three main types of multiple emulsions were observed [16] Type A droplets contained on a large internal droplet, similar to that observed by Matsumoto et al. [17]. This type was produced when polyoxyethylene oxide (4) lauryl ether (Brij 30) was used as secondary emulsifier at 2%. Type B droplets contained several small internal droplets. These were prepared using 2% polyoxyethylene (16.5) nonylphenyl ether (Triton X-165). Type C drops entrapped a large number of small internal droplets. These were prepared using a 3 1 Span 80-Tween 80 mixture. 

Acharya, A., Sanyal, S.K., andMoulik, S.P. 2001 Physicochemical investigations on microemulsification of eucalyptol and water in presence of polyoxyethylene (4) lauryl ether (Brij-30) and ethanol, Int. J. Pharm. 229 213-226. 

The tested enhancers were benzalkonium chloride (BZ), polyoxyethylene glycol lauryl ether (Brij 35), Polyoxyethylene glycol stearyl ether (Brij 78), Polyoxyethylene glycol oleyl ether (Brij 98), ethylenediaminetetraacetic acid, Na salt (EDTA), digitonin (DIG), sodium taurocholate (TC) and saponine (SAP). The results of the study are summarized in Table 3. In the absence of enhancers, the comeal permeability of the less lipophilic TM was lower than those of LB and CY, in agreement with literature data. In general, the enhancers increased the rate of permeation of TM more than those of the other two, more lipophilic... 

Florence and Whitehill [38] distinguished between three types of multiple emulsions (W/O/W) that were prepared using isopropyl myristate as the oil phase, 5 % Span 80 to prepare the primary W/0 emulsion and various surfactants to prepare the secondary emulsion (a) Brij 30 (polyoxyethylene 4 Lauryl ether) 2%. (b) Triton X-165 (polyoxyethylene 16.5 nonyl phenyl ether (2%). (c) 3 1 Span 80 Tween 80 mixtures. A schematic picture of the three structures is shown in Fig. 1.34. The most common structure is that represented by (b) whereby the large size multiple emulsion droplets (10-100 pm) contain water droplets 1 pm. A schematic representation of some breakdown pathways that may occur in W/O/W multiple emulsions is shown in Fig. 1.35. 

Kriegel et al. [165] again found that the addition of PEO (25% of polymer content) facilitated fiber formation from chitosan. They included in the blend fibers different surfactants, i.e. sodium dodecyl sulfate (SDS), dodecyltrimethylammonium bromide (DTAB) and polyoxyethylene glycol (23) lauryl ether (Brij 35). The surfactants can be retained in the nanofibers either in the form of micelles or monomers. Furthermore, the addition of... 

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