Surfactant Mixtures Research Articles

Interaction of sodium dodecyl sulfate and triton X-100 with ofloxacin drug using conductivity and UV–visible spectroscopic techniques in aqueous alcohols media at several temperatures

The current investigation explores the association and complexation of the mixture of anionic surfactant, sodium dodecyl sulfate (SDS), and antibiotic drug, ofloxacin (OFC) as well as nonionic surfactant, Triton X-100 (TRX) and OFC drug respectively in several additive solutions. The investigations were performed by applying conductivity and UV-Visible spectroscopic techniques. The impacts of drug concentration, types of solvents, and composition of aq. solutions of alcohols (methanol (MeOH), ethanol (EtOH), and 1-propanol (1-PrOH)) as well as temperature change have been investigated on the micelle formation of SDS + OFC mixture. The micellization of SDS + OFC and TRX + OFC systems has been characterized by the determination of critical micelle concentration (CMC) from conductivity vs. SDS concentration (conductivity technique) and Absorbance vs log[TRX] (UV-Visible spectroscopic technique) plots respectively. The micellization of SDS was delayed owing to the introduction of the OFC drug while the effect has been intensified as a function of OFC concentration. At a fixed OFC concentration and temperature, the CMC values were acquired to be augmented with the upsurge of alcohol concentration. The enhancement of the CMC changes has been perceived with the escalation of temperature at a definite concentration of OFC in water and 5% (w/w) aq. alcohols media. The disfavor of micellization of TRX in aq. EtOH solutions in comparison to aqueous solution also detected from UV-Visible spectroscopic technique. The binding constant (Kb) for the complexation of TRX with OFC drug was determined using the Benesi-Hildebrand plot. The Kb values were obtained to be affected by the change of solvent and temperature. The negative free energy change (∆Gmo/ ∆Gbo) of the micellization and complexation demonstrate the spontaneous occurrence of micelle formation and complex development. The enthalpy changes (∆Hmo) of micellization were negative (exothermic process) and entropy changes (∆Smo) were positive (highly disordered and entropy-dominated micellization). Other thermodynamic properties ((∆Hbo and ∆Sbo) and thermodynamics of transfer) have been evaluated and illustrated as well, for the working systems.

Evaluation of the effect of acid additives on rheological properties and technological efficiency of zwitterionic and anionic surfactant mixtures

Relevance. Various acid additives such corrosion inhibitors, iron stabilizers, demulsifiers, anti-precipitation agents are usually used to provide necessary technological properties to acid compositions. Adding the additives into the acid composition based on viscoelastic surfactants can have a significant impact on the efficiency of their subsequent use, since micelle formation and, consequently, rheology of their solutions are particularly sensitive to the presence of additional components in the system. Accordingly, determination of the acid additives influence on rheological properties and technological efficiency of acid compositions with surfactants is a vital task. Aim. To evaluate the effect of acid additives on rheological behavior of viscoelastic surfactants-based acid compositions (mixture of cocamidopropyl betaine and ethoxylated fatty alcohol sulfosuccinate). Object. Acidic composition based on viscoelastic surfactants (a mixture of anionic and zwitterionic surfactants) and a package of acidic additives – corrosion inhibitor, iron stabilizer, demulsifier and antisludge agent. Methods. Investigation of rheological properties using an MCR52 rheometer (Anton Paar GmBH) in the shear rate range from 1 to 100 s–1 at temperatures from 20 to 90°C, standard tests for selecting acid additives. Results. The authors have determined the effect of acid additives on rheological properties of the developed self-diverting acid solution based on the viscoelastic surfactant (a mixture of anionic and zwitterionic surfactants). The obtained results confirmed that adding the acid additives into solutions leads to a decrease in partially neutralized solution viscosity. However, it expands the range of manifestation of viscoelastic properties. This will increase the efficiency of the developed composition during acid treatment. Also, the addition of acid additives reduces the initial viscosity, which facilitates acid injection into formation. A viscoelastic gel is not formed with hydrocarbons, which indicates that the treatment is effective in cleaning up the area after acidizing. The temperature test showed that the additives do not affect the temperature range of acid solution application.

Molecular dynamics simulations of adsorption behavior of mixtures of surfactant and polymer at C3A/water and Ettringite/water interfaces

In cementitious system, surfactant is used as air-entraining agents, which is often incompatible with other chemical admixtures, such as superplasticizers. The adsorption of surfactants at solid–liquid interface is critical for the bubble stability. The measurement of adsorption properties of surfactant in fresh cement or concrete is very difficult. In this study, classical molecular dynamics simulations is used to analysis the influence of two polymers (call as HPMC and PCA, respectively) on the adsorption behaviors of the two anionic surfactants (call as HSO4 and HPO4, respectively) at the C3A/water and ettringite/water interfaces. At solid/water interface, both of HSO4 and HPO4 molecules form a monolayer with hydrophilic head groups adsorbed on the solid surfaces. After adding polymers, the adsorption conformations are changed to spherical micelle or multilayer. The electrostatic interaction between oxygen atoms of hydrophilic head groups and calcium atoms of solid surface plays a decisive role. Therefore, the value of adsorption energy of HPO4 with more negatively charged hydrophilic head groups is greater than that of HSO4. The adsorption energies of the two surfactants are weakened by the two polymers, but the adsorption energy value of HPO4 is always greater. The influence mechanism of HPMC and PCA is different. The negatively charged PCA has a strongly competitive adsorption with the surfactants. The neutral HPMC has a weak adsorption capacity but it carries many hydroxyl groups to interact with the hydrophilic head groups of surfactants.

Multicomponent Photocatalytic-Dispersant System for Oil Spill Remediation.

In the present work, the potential application of a fabricated halloysite nanotubes-Ag-TiO2 (HNT-Ag-TiO2) composite loaded with a binary surfactant mixture made up of lecithin and Tween 80 (LT80) in remediating oil spillages was examined. The as-prepared Ag-TiO2 that was used in the fabrication of the HNT-Ag-TiO2-LT80 composite was characterized by X-ray diffraction, Raman spectroscopy, UV-vis and diffuse reflectance spectroscopy, CV analyses, and SEM-EDX. The synthesized composite was also characterized by thermogravimetric analysis, Fourier-transform infrared spectroscopy, and scanning electron microscopy-energy dispersive X-ray spectroscopy. The synthesized composite was active in both the UV and visible light regions of the electromagnetic spectrum. The oil-remediating potential of the as-prepared composite was examined on crude oil, and aromatics and asphaltene fractions of crude oil. The composite was able to reduce the surface tension, form stable emulsions and smaller oil droplet sizes, and achieve a high dispersion effectiveness of 91.5%. A mixture of each of the crude oil and its fractions and HNT-Ag-TiO2-LT80 was subjected to photodegradation under UV light irradiation. The results from the GC-MS and UV-vis analysis of the photodegraded crude oil revealed that the photocatal composite was able to photodegrade the crude oil, aromatics, and asphaltene fractions of crude oil with the formation of intermediate photodegradation products depicting that the HNT-Ag-TiO2-LT80 has a potential as an oil spill remediation material.

Synergistic mechanism in anionic/zwitterionic and anionic/nonionic surfactant mixtures on improving the thermal stability of emulsions: An experimental and simulation study

Surfactant emulsions are crucial for stabilizing and enhancing the dispersibility of immiscible substances, enabling efficient mixing and delivery of active ingredients in various industries such as oil recovery, pharmaceuticals, food, and cosmetics. However, a comprehensive understanding of the synergistic mechanism governing surfactant-formed emulsions and their thermal stability remains elusive. Motivated by these knowledge gaps, the self-assembly and interfacial behavior of binary surfactants as well as their influence on the thermal stability of emulsions were systematically investigated. Utilizing a combination of experimental and theoretical approaches, we observed extraordinary synergistic effects in the anionic/zwitterionic and anionic/nonionic surfactant systems, leading to a significant reduction in surface tension and critical micelle concentration, quantitatively assessed by activity parameters and intermolecular interaction parameters. The microscopic mechanism responsible for the observed synergistic effects was investigated by dissipative particle dynamics (DPD) simulations, which could be attributed to steric effects, electrostatic interactions, and hydrophobic interactions. The self-assembly behavior of binary surfactants into micelles was further analyzed to substantiate these findings. Furthermore, the synergistic effects of emulsification performance and thermal stability in binary surfactant systems were quantified by water separation rate and emulsification composite index. Coarse-grained models of oil/water/surfactants were developed to demonstrate the augmented stability of interfacial films to the presence of binary surfactants. The obtained results shed lights on the inherent synergistic mechanism within binary surfactant mixtures, demonstrating their potential in enhancing emulsion thermal stability and paving the way for diverse industrial applications.

Decoding the conformational binding of drug mixtures on ovalbumin: An integrated multimodal network

This research addresses the crucial necessity for a deeper understanding of the binding interactions between surfactants and proteins, with a specific focus on ovalbumin. Considering ovalbumin's role in diverse biochemical processes, it remains a subject of significant interest for drug discovery and design. To fill existing knowledge gaps, we investigated the binding interaction between dicloxacillin and cetyltrimethylammonium bromide (CTAB) on ovalbumin, employing a comprehensive approach that combines computational modeling with experimental validations. Using the ezPocket tool, the computational phase predicted ten relevant binding sites on ovalbumin's surface. The isobologram combination index (CI) heatmap strongly suggested a complex interplay of antagonistic and synergistic effects. Besides, a conformational drug-drug interaction network was proposed to explore the stability of the surfactant mixture within specific binding sites of ovalbumin, revealing a dynamic landscape of suggested antagonist effects. Experimental validations through UV–vis, Fluorescence, and circular dichroism (CD) spectroscopy further corroborated the computational findings, confirming the formation of stable complexes. Finally, this study not only advances our comprehension of ovalbumin's interactions with surfactants but also offers a multidimensional perspective and an advanced methodological framework for efficient therapeutic strategies, opening new avenues for future applications in drug development and applied biochemistry.

Study on the properties of branched-chain alkyl glycoside nonionic surfactant and anionic surfactant in a mixed system

Abstract The surface activity, intermolecular interactions and thermodynamic parameters of a mixture of a nonionic surfactant (branched-chain alkyl glycoside (IG-10)) and an anionic surfactant (alcohol ether carboxylic acid (90H)) were investigated and the wetting, emulsifying and foaming properties of the mixed system were also evaluated. The results show that there is a mutual attraction at the mixed micelles and gas/liquid interfaces formed by the two surfactants. The thermodynamic parameters show that the formation of mixed micelles from two different surfactants is a non-ideal process. In terms of application performance, the wetting ability and foaming properties of the mixed system showed good synergistic effects, with the wetting time of the mixed system being shorter than that of the two single surfactant systems and the foam stability being weaker than that of the single system. The best emulsifying capacity was obtained when the mass fraction of 90H was 50 %.

The Resistance of Polyethersulfone Membranes on the Alkaline Cleaning Solutions.

Polyethersulfone (PES) is a polymer popularly used to produce ultrafiltration (UF) membranes. PES is relatively hydrophobic; thus, hydrophilic ingredients are added to the membrane matrix to reduce the fouling intensity. Ingredients such as polyvinylpyrrolidone (PVP) reduce the resistance of PES to NaOH solutions. This study investigated the possibility of using PES membranes for the separation of alkaline cleaning solutions. For this purpose, self-made PES membranes and commercial ultrafiltration PES membranes (UE10-10 kDa and UE50-100 kDa) containing PVP additive were used. The membranes were soaked for 18 months in alkaline (pH = 11.3-11.5) solutions of car washing fluids. It has been found that long-term contact with these solutions caused changes in the structure of the surface layer, especially of membranes containing PVP. As a result, the separation of dextran (100-200 kDa) decreased by 30-40% for PES membranes, 30-40% for UE10 and 40-60% for UE50. Despite these changes, the separation efficiency (rejection of COD, NTU and anionic surfactants) of synthetic car wash wastewater (mixture of surfactants and hydrowax) was similar to the results obtained for pristine membranes.

Enhanced solubility of methyl ester sulfonates below their Krafft points in mixed micellar solutions

HypothesisMethyl ester sulfonates (MES) show limited water solubility at lower temperatures (Krafft point). One way to increase their solubility below their Krafft points is to incorporate them in anionic surfactant micelles. The electrostatic interactions between the ionic surfactant molecules and charged micelles play an important role for the degree of MES solubility. ExperimentsThe solubility and electrolytic conductivity for binary and ternary surfactant mixtures of MES with anionic sodium alpha olefin sulfonate (AOS) and sodium lauryl ether sulfate with two ethylene oxide groups (SLES-2EO) at 5 °C during long-term storage were measured. Phase diagrams were established; a general phase separation theoretical model for their explanation was developed and checked experimentally. FindingsThe binary and ternary phase diagrams for studied surfactant mixtures include phase domains: mixed micelles; micelles + crystallites; crystallites, and molecular solution. The proposed general phase separation model for ionic surfactant mixtures is convenient for construction of such complex phase diagrams and provides information on the concentrations of all components of the complex solution and on the micellar electrostatic potential. The obtained maximal MES mole fraction of transparent micellar solutions could be of interest to increase the range of applicability of MES–surfactants.

Effect of electrolytes on the mechanism of clouding process and physico-chemical quantities of non-ionic surfactant and ciprofloxacin hydrochloride mixture

An investigation of the clouding behaviour of the aqueous solution of ciprofloxacin hydrochloride (CIPH) + Triton X-100 (TX-100) under different electrolytes media was performed by the phase-changing measurement method. The CP of the resultant mixture has been studied in aqueous solutions of some organic and inorganic salts (sodium carbonate (Na2CO3), sodium oxalate (NaOxa), sodium acetate (NaOAc) and magnesium sulphate (MgSO4)). The CP values of TX-100 (50 mmol kg−1) + CIPH (1 mmol kg−1) solution decreases in the presence of all electrolytes while the CP values satisfy the sequence: CP (aq. NaOAc) > CP (aq. MgSO4) > CP (aq. Na2CO3) > CP (aq. NaOxa). The decrease in the solubility of employed solution in the aq. electrolytes media was observed and obtained maximum solubility in aqueous NaOAc and minimum solubility in the aqueous NaOXa medium. The obtained positive Gibbs-free energy ( Δ G c 0 ) demonstrates the nonspontaneous nature of phase separation while the extent of nonspontaneity exhibits the reduction with enhancing electrolyte concentrations. The Δ H c 0 and Δ S c 0 values depict the existences of electrostatic and hydrophobic interactions between TX-100 and CIPH in aq. electrolytes solutions and the clouding process is enthalpy controlled. Entropy-enthalpy compensation variables were computed.

Aspirin Spectrophotometric Determination using Cloud Point Extraction and HPLC in Several Pharmaceuticals Sold in Iraqi Markets

In this work, a sensitive tandem cloud-point extraction (CPE) method with a solvation system was employed to detect aspirin in various pharmaceuticals. Aspirin, in a dilute acidic solution, formed a complex with Zn(II) ions ([Zn(II)-aspirin] complex), which was then extracted using two different surfactant systems - nonionic surfactant Triton X-100 and a mixture of surfactants (SDS-Tween 80). The extracted complex was subsequently determined using spectrophotometry at a wavelength of 293 nm for Triton X-100 and 231 nm for SDS-Tween 80. The parameters for extraction, including HCl and Zn(II) concentration, temperature, heating time, and solvent used to dissolve the cloud point layer, were thoroughly investigated. Highperformance liquid chromatography (HPLC) was used as the standard method to compare the quantitative analysis of the cloud-point extraction-onium system.

Cloud Point Extraction Method for Separation and Preconcentration of Molybdenum and Zirconium Using Mixture of Surfactants from Natural Waters and their Determination by Spectrophotometry

Cloud Point Extraction Method for Separation and Preconcentration of Molybdenum and Zirconium Using Mixture of Surfactants from Natural Waters and their Determination by Spectrophotometry

Label-free detection of Aβ-42: a liquid crystal droplet approach for Alzheimer's disease diagnosis.

This study introduces a biosensor based on liquid crystals (LC) designed to detect the Aβ-42 biomarker, commonly associated with Alzheimer's disease. The sensor utilizes LC droplets created using a PEI/Tween-20 surfactant mixture, arranged radially in an aqueous solution. These droplets are coated with the Aβ1-16 antibody, enabling the detection of the Aβ1-42 biomarker. The key advantage of this biosensor lies in its ability to directly translate the antigen-antibody interaction into a change in the molecular orientation of the LC droplets, simplifying the detection process by removing additional procedural steps. Specifically, this immunoassay induces a transformation in the nematic droplets orientation from radial to bipolar upon successful antigen binding. When only the Aβ1-16 antibody coated the LC droplets, no change in orientation was detected, confirming the reaction's specificity. The orientation shift in the LC droplets indicates the formation of an immunocomplex between the Aβ1-16 antibody and the Aβ1-42 antigen. The LC droplet immunoassay effectively detected Aβ1-42 antigen concentrations ranging from 45 to 112.5 μM, with the Aβ1-16 antibody immobilized on the droplets at a concentration of 1 μg mL-1. These findings suggest that the LC microdroplets' orientational behavior can be harnessed to develop a biosensor for the in vivo detection of various proteins or pathogens in a PBS aqueous medium. Owing to its label-free nature and distinct optical signaling, this LC droplet-based immunoassay holds promise for further development into a cost-effective, portable diagnostic tool.

Synergistic effects between a non-ionic and an anionic surfactant on the micellization process and the adsorption at liquid/air surfaces.

Predicting the behaviour of solutions with surfactants of significantly different critical micelle concentration (CMC) values remains a challenge. The study of the molecular interactions within micelles and interfaces in surfactant combinations used in everyday products is essential to understand these complex systems. In this work, the equilibrium and dynamic surface tension in the presence of mixed non-ionic (tristyrylphenol ethoxylates) and anionic (sodium benzene sulfonate with alkyl chain lengths of C10-C13) surfactants, commonly encountered as delivery systems in agrochemicals, were studied and their CMC values were determined. For the surfactant mixtures, four molar ratios were examined: nEOT/nNaDDBS = 0.01, 0.1, 1, 4 and two different cases were analysed, the premixed and the add one by one surfactant. The surface tension for single surfactants stabilised quickly, while the mixtures needed a long time to reach equilibrium; up to 15 h for the premixed mixtures and 40 min when surfactants were added one by one. The CMC values for the nEOT/nNaDDBS = 0.01, 0.1 premixed surfactant mixtures were found to be in between the CMC values of the single surfactants, but those for the nEOT/nNaDDBS = 1 and 4 mixtures were lower than the CMCs of both single surfactants. Calculations based on the regular solution theory suggested that there are attractive forces in the mixed micelles and at the interface layers, while the supramolecular assemblies in the bulk (i.e., micelles) and at interfaces (surfactant films) are preferentially enriched in EOT.

Interaction of antidepressant drug with surfactant mixture in various compositions: effect of electrolyte and urea

Interaction of antidepressant drug with surfactant mixture in various compositions: effect of electrolyte and urea

Screening of surfactant mixture ratio for preparation of oil-in-water nanoemulsion: A technical note

In the present work, nanoemulsions were fabricated utilizing the high-energy emulsification method. The selection of the ratio of surfactant (tween 80)/co-surfactant (lauroglycol 90) mixtures (Smix) used for the preparation of nanoemulsion was done on the basis of the area occupied by Smix molecules at the interface. Amin at the interface gives the information about the molecules that adsorb at the oil–water interface pack together. The small value of Amin indicates that strong adsorption has taken place at the oil–water interface. Moreover, it indicates a close contact between oil and water too. Molecular orientations of surfactant molecules at this ratio are nearly perpendicular to the interface, providing a more close packing thereby producing a more stable nanoemulsion. A composition that contains different ratios of surfactant (tween 80)/co-surfactant (lauroglycol 90) mixtures (Smix) was prepared to achieve a small Amin value. Surface tension value was used to estimate the area per molecule and surface excess concentration. The value of Amin for Smix ratios 1:0, 1:1, 2:1, 3:1, 4:1, 5:1, 1:2, and 1:3 were found to be 0.83, 0.82, 0.70, 0.62, 0.54, 0.60, 0.86, and 0.87, respectively. Among these Smix ratios, ratio 4:1 was selected for preparing the nanoemulsion as it exhibited the low Amin required for optimum emulsification conditions. It can be inferred that the determination of Amin for Smix serves as an effective technique in the screening of Smix ratio for producing a stable nanoemulsion.

Lessons Learned in Interfacial Tension Prediction Using a Mixture of Sulfonate- and Ethoxylate-based Surfactants in a Waxy Oil-brine System

The chemical-enhanced oil recovery (CEOR) method is applied to change reservoir rock or fluid characteristics by injecting alkaline, surfactant, and polymer or a combination of two or three of the compounds. Surfactant flooding improves oil recovery by reducing the interfacial tension between oil and water. Selecting reservoir surfactants, especially microemulsions, requires careful screening. This study predicted waxy oil system interfacial tension using surfactant mixtures at below- and above-optimum salinity. To predict the interfacial tension, microemulsion types, HLB, ideal salinity, and HLD were used. The study predicted oil-surfactant-water interfacial tension using SAE, FEO, and their mixtures. We improved the Huh equation by adding a fitting parameter, β, to accommodate the transition from type III to type II microemulsions as salinity increases. With increasing salinity, anionic surfactant’s hydrophilic-hydrophobic interactions change, affecting the values and surfactant layer thickness. This study improved hydrophilic-lipophilic deviation (HLDN) by establishing a fixed interval for nonionic surfactants. Van der Waals attraction, values and interface surfactant layer thickness are connected, reflecting the fact that lower values reduce interfacial tension better. This study also found that surfactant packing at the oil-water interface increases the order of the oil-solution ratio and the microemulsion values with polarity.

Effect of Different Hydrophilic-lipophilic Balance (HLB) on Droplet Size, Polydispersity Index and Stability of Lemon Myrtle Nanoemulsion

Using mixed non-ionic surfactants Tween/Span, we determined the required hydrophilic-lipophilic balance (HLB) value on the oil in water nanoemulsion of lemon myrtle essential oil. In this study, Span 80 mixed with Tween 80, and Span 20 mixed with Tween 20 were used as mixed non-ionic surfactant. The droplet size, polydispersity index and stability of the lemon myrtle nanoemulsion at different HLB values were obtained over a period of 28 days. Both mixed surfactants have similar required HLB value at HLB 14 due to their smallest droplet size and lowest polydispersity index during the early nanoemulsion preparation. However, after a period of 28 days, nanoemulsion with Span 80-Tween 80 surfactant mixture was more stable compared to Span 20-Tween 20 surfactant mixture. Therefore, HLB 14 using Span 80-Tween 80 surfactant mixture has been selected as the required HLB for lemon myrtle nanoemulsion due to its stability and consistency of droplet size in 28 days.

Cubosomes: Recent Developments and Applications from a Global Perspective

Liquid crystalline cubosomes are self-assembly of aqueous lipid and surfactant mixture. They are discrete and sub-micron in size. It is an innovative lipid-based nanosystem resembling well-known vesicular systems including niosomes and liposomes. Cubic phases incorporate lipophobic, amphiphilic and hydrophilic, components through the utilization of a rounded bi-continuous lipid bilayer and water channels. Cubosomes contain lipids such as phytantriol (PHYT) and glycerol monooleate (GMO) which are amphiphilic in nature that are diffused in water and structured in 3-D as a “honeycomb” structure with suitable stabilizer (Poloxamer 407). Cubosomes are generated by mostly two techniques i.e., top-down, bottom-up methods. UV spectrophotometer, X-ray scattering, transmission electron microscopy, and photon correlation spectroscopy are used to characterize and evaluate cubosomes. They are commonly used in the administration of oral, ophthalmic, transdermal, and chemotherapeutic drugs. The liquid crystalline phase and bicontinuous cubic form nanoparticles are thoroughly discussed in this paper. In the current review search criterion used parameters affecting cubosomes bi-continuous lipid bilayer by top-down and bottom-up methods mostly. The sources referred from peer-reviewed recognized journals. Keywords used as filters were cubosomes, amphiphilic lipids, top-down, bottom-up, bicontinuous, GMO, and phytantriol (PHYT). For the purpose of a comprehensive update literature review over a range (1976–2023) has been conducted on the recent developments cubosomes system.

Impact of lipid matrix composition on the activity of membranotropic enzymes galactonolactone oxidase from Trypanosoma cruzi and L-galactono-1,4-lactone dehydrogenase from <i>Arabidopsis thaliana</i> in the system of reverse micelles

The study of many membrane enzymes in an aqueous medium is difficult due to the loss of their catalytic activity, which makes it necessary to use membrane-like systems, such as reverse micelles of surfactants in nonpolar organic solvents. However, it should be taken into account that micelles are a simplified model of natural membranes, since membranes contain many different components, a significant part of which are phospholipids. In this work, we studied the impact of the main phospholipids, phosphatidylcholine (PC) and phosphatidylethanolamine (PE), on the activity of membrane enzymes using galactonolactone oxidase from Trypanosoma cruzi (TcGAL) and L-galactono-1,4-lactone dehydrogenase from Arabidopsis thaliana (AtGALDH) as an examples. Effect of the structure (and charge) of the micelle-forming surfactant itself on the activity of both enzymes has been studied using an anionic surfactant (AOT), a neutral surfactant (Bridge-96), and a mixture of cationic and anionic surfactants (CTAB and AOT) as an examples. The pronounced effect of addition of PC and PE lipids on the activity of AtGALDH and TcGAL has been detected, which manifests as increase in catalytic activity and significant change in the activity profile. This can be explained by formation of the tetrameric form of enzymes and/or protein-lipid complexes. By varying composition and structure of the micelle-forming surfactants (AOT, CTAB, and Brijdge-96 and their combinations) it has been possible to change catalytic properties of the enzyme due to effect of the surfactant on the micelle size, lipid mobility, charge, and rigidity of the matrix itself.