Reduction Of Water Surface Tension Research Articles

Understanding the surface tension reduction of the water/air interface due to the synergistic effect of the SDS-CTAB mixture: A molecular dynamics simulation study

Using molecular dynamics simulation, the surface tension is calculated and compared with experimental data to provide a microscopic interpretation of the synergistic effect on water surface tension reduction caused by a binary mixture composed of anionic and cationic surfactants. For the anionic and cationic surfactants, the sodium dodecyl sulphate (SDS) and the cetyl trimethylammonium bromide (CTAB) were used, respectively. Besides the electrostatic attraction between the anionic and cationic surfactants, resulting in a synergistic effect, other properties were analysed to study the reduction of the surface tension from a molecular level. For different SDS:CTAB composition of distinct properties of the pseudobinary mixture, such as the hydrogen bonds, order of the tails, and the arrangement of the surfactants at the interface were calculated. Those properties present different behaviours at the maximum and minimum values of the surface tension. The CTAB tails present a higher order than the SDS tails at all SDS:CTAB compositions however, the first ones show a maximum order at the minimum in the surface tension. The excess configurational energy was also calculated and shows a minimum value in the same composition as the minimum value of the surface tension.

Understanding the surface tension reduction of the water/air interface due to the synergistic effect of the SDS-CTAB mixture: A molecular dynamics simulation study

Using molecular dynamics simulation, the surface tension is calculated and compared with experimental data to provide a microscopic interpretation of the synergistic effect on water surface tension reduction caused by a binary mixture composed of anionic and cationic surfactants. For the anionic and cationic surfactants, the sodium dodecyl sulphate (SDS) and the cetyl trimethylammonium bromide (CTAB) were used, respectively. Besides the electrostatic attraction between the anionic and cationic surfactants, resulting in a synergistic effect, other properties were analysed to study the reduction of the surface tension from a molecular level. For different SDS:CTAB composition of distinct properties of the pseudobinary mixture, such as the hydrogen bonds, order of the tails, and the arrangement of the surfactants at the interface were calculated. Those properties present different behaviours at the maximum and minimum values of the surface tension. The CTAB tails present a higher order than the SDS tails at all SDS:CTAB compositions however, the first ones show a maximum order at the minimum in the surface tension. The excess configurational energy was also calculated and shows a minimum value in the same composition as the minimum value of the surface tension.

Reduction of Surface Tension of Petroleum Using Hydrocarbon Degrading Bacterial Activity

Hydrocarbon degrading bacteria produce biosurfactants, which facilitate the biodegradation process. This is the first step towards getting access to interactions between the bacteria's hydrophilic surface and the hydrophobic surface of the hydrocarbons. Due to their amphipathic nature, biosurfactants facilitate this interaction. The focus of the study is to obtain hydrocarbon-degrading bacteria isolates and evaluate biosurfactant activity in reducing water surface tension. Hydrocarbon-degrading bacteria were isolated from contaminated marine sediment samples and consequently cultured on artificial seawater media with the addition of petroleum hydrocarbons as a carbon source. Surface tension reduction of biosurfactants was measured using a digital K20-EasyDyne tensiometer (KRÜSS: Hamburg, Germany). The study indicates that the isolates have biodegradation activity and reduced water surface tension by 22.14 mN/m, the data demonstrated that biosurfactant production was most effective on the third day of the exponential phase incubation. These studies demonstrate the effectiveness of hydrocarbon-degrading bacteria to produce biosurfactants as biodegradation agents to solve the problem of oil pollution.

Effect of fluorocarbon surfactants on the adsorption of hydrocarbon surfactants mixture at the water-air interface

Taking into account the great practical importance of the surface tension of the aqueous solution of multicomponent surfactant mixtures their adsorption at the water-air interface and the composition of the adsorbed monolayer were considered. For this consideration the mixture of the p-(1,1,3,3-tetramethylbutyl) phenoxypoly(ethylene glycol) Triton X-165 (TX165) and hexadecyltrimethylammonium bromide (CTAB) with FC6EO14 as well as with FC5EO10 was applied. The surface tension of the studied solution at the constant CTAB and TX165 binary mixture concentration corresponding to its solution surface tension equal to 60 and 50 mN/m and changing fluorocarbon surfactant concentration was measured. The obtained results were described by the exponential function of the second order and predicted by the modified Fainerman and Miller equation. To solve the Fainerman and Miller equation the fraction of adsorbed mixed monolayer at the water-air interface occupied by particular surfactants was determined. For its determination, the contribution of particular surfactants in the mixture to reduction of water surface tension was taken into account. The fraction occupied by the given surfactant in the mixed monolayer was compared to that determined using the Hua and Rosen equation obtaining good agreement between them. The fraction of the mixed monolayer occupied by a given surfactant was also successfully used to solve the Gibbs and Frumkin equations for determination of surface concentration of a particular surfactant in the mixed monolayer. Based on the isotherms of the surface excess concentration as well as the Hua and Rosen theory the packing of the mixed monolayer and the presence of the synergetic effect in the reduction of water surface tension were deduced. This effect was also reflected in the standard Gibbs free energy of adsorption of surfactant mixtures at the water-air interface. It was found that this energy can be predicted based on this energy for particular surfactants of the mixture and Gibbs free energy of mixing.

Adsorption Properties of Hydrocarbon and Fluorocarbon Surfactants Ternary Mixture at the Water-Air Interface.

Measurements were made of the surface tension of the aqueous solutions of p-(1,1,3,3-tetramethylbutyl) phenoxypoly(ethylene glycols) having 10 oxyethylene groups in the molecule (Triton X-100, TX100) and cetyltrimethylammonium bromide (CTAB) with Zonyl FSN-100 (FC6EO14, FC1) as well as with Zonyl FSO-100 (FC5EO10, FC2) ternary mixtures. The obtained results were compared to those provided by the Fainerman and Miller equation and to the values of the solution surface tension calculated, based on the contribution of a particular surfactant in the mixture to the reduction of water surface tension. The changes of the aqueous solution ternary surfactants mixture surface tension at the constant concentration of TX100 and CTAB mixture at which the water surface tension was reduced to 60 and 50 mN/m as a function of fluorocarbon surfactant concentration, were considered with regard to the composition of the mixed monolayer at the water-air interface. Next, this composition was applied for the calculation of the concentration of the particular surfactants in the monolayer using the Frumkin equation. On the other hand, the Gibbs surface excess concentration was determined only for the fluorocarbon surfactants. The tendency of the particular surfactants to adsorb at the water-air interface was discussed, based on the Gibbs standard free energy of adsorption which was determined using different methods. This energy was also deduced, based on the surfactant tail surface tension and tail-water interface tension.

Foam properties, detergent abilities and long-term preservative efficacy of the saponins from Sapindus mukorossi

Pericarp of Sapindus mukorossi Gaertn has been used as a natural detergent and its extract is commercially utilized as a foam-stabilizing and emulsifying agent. The goal of this study is to investigate the foam properties, detergent ability and long-term preservative efficacy of the saponins from the pericarp of S. mukorossi Gaertn. The crude saponin content in the pericarp of S. mukorossi Gaertn was 14.2% and the total saponins content in the crude saponins extract was 85% (w/w). The foaming power of the 0.5% crude saponins extract solution from 5. mukorossi Gaertn is 65% of 0.5% SLS solution and similar to that of 0.5% Tween 80 solution. The R5 value of 91.7% represented good foam stability of the crude saponins extracted from the pericarp of the plant. With the reduction of water surface tension from 72 mN/m to 51.7 mN/m, the 0.5% crude saponins extract solution has wetting ability. The sebum-removed experiment indicated that the crude saponins extract has moderate detergency. The results of the long-term preservative efficacy test revealed that the 0.5% crude saponins extract from the pericarp of S. mukorossi Gaertn is an effective preservative against Staphylococcus aureus ATCC 6538, but inefficacious against Escherichia coli ATCC 8739 and Aspergillus niger ATCC 16404.

Adsorption properties of rhamnolipid and ethanol at water/ethanol solution-air interface

Abstract The water/ethanol solutions of surfactants and/or their mixtures are very often used in practice. Alcohol changes largely, among others adsorption, aggregation and wetting properties of the surfactants. Therefore, measurements of the surface tension of the water/ethanol solution of rhamnolipid were made. For this purpose the du Nouy ring method was applied. The measured values of the surface tension of rhamnolipid water/ethanol solution were compared to those calculated using the Miller et al., Connors equations as well as independent adsorption method. These results were also analyzed taken into account the contributions of the adsorbed rhamnolipid and ethanol in the mixed film pressure at the water/ethanol solution-air interface. This analysis allowed us to determine the mutual effect of rhamnolipid and ethanol on their adsorption at the solution-air interface. The adsorption of the rhamnolipid and ethanol was discussed on the basis of the Gibbs, Langmuir and Frumkin equations of the adsorption isotherm. The tendency of rhamnolipid and ethanol to adsorb at the solution-air interface was discussed based on the Gibbs free energy of adsorption which was determined using different methods. The obtained results and their analysis show that there is not a synergetic effect in the water surface tension reduction by the ethanol and rhamnolipid mixture adsorption.

Amphiphilic and amphoteric aqueous soy protein colloids and their cohesion and adhesion to cellulose

Highly stable aq. soy protein (SP) colloids have been facilely prepared by high-speed blending (30k rpm, 15 min) to homogeneously disperse up to 97.7 % of soy protein isolate at up to 9 %. Aq. SP colloids were amphoteric with a 4.5 isoelectric point and ζ-potentials ranging from +32.4 mV at pH 2.2 to -39.1 mV at pH 7.1 with respective average hydrodynamic diameters of 157 and 233 nm. Diluted aq. SP colloids (0.0001 %) dried on hydrophilic mica appeared as 6.0 nm thick and 16.4 nm wide disk-like nanoparticulates. Aq. SP colloids were also amphiphilic, reducing water surface tension to 41.2 mN/m at > 0.98 % and could be solvent-exchanged to dimethyl formaldehyde or 4:1 v/v methanol/water. Colloidal SPs exhibited preferential affinity and adhesion to cellulose filter paper to significantly improve the respective tensile modulus and strength by 70 and 42 % at merely 2.8 % dried add-on. The improved cohesion of 6.2 % SPs was evident by drying at 110 °C to further increase the respective tensile modulus and strength of cellulose by another 78 and 41 %.

Magnetic Field Effects on Aqueous Anionic and Cationic Surfactant Solutions Part I: Water Evaporation

Static magnetic field (0.5 T) effects on water evaporation rate from anionic Sodium Dodecyl Sulfate (SDS) and cationic Dodecyl Trimethyl ammonium Bromide (DoTAB) 1 mM solutions were studied at room temperature and humidity for up to several hours. Keeping in mind possible practical application of the effects the experiments were intentionally carried out in a common laboratory environment and not in any sophisticated conditions. The evaporation of water from Magnetic Field (MF) treated and untreated samples were carried out simultaneously in the same environment. Although the quantitative differences in the evaporated amounts of water between MF treated and untreated samples changed from run to run, the qualitative MF effects were always reproducible. Therefore, it is believed that the observed changes are significant. It was found that the MF affects evaporation rate of water from solutions of both surfactants causing increase in the evaporated water amount in comparison to that of MF untreated sample. Prior to MF experiments first the water evaporation rate from the untreated surfactants solutions was studied. From the MF-untreated anionic surfactant solution water evaporated slower than from pure water, while from the cationic one water evaporated faster than from pure water. This difference was explained taking into account the properties of the polar (ionic) head of the surfactants, i.e. their size, ability to hydrogen bonding formation with water molecules, and the reduction of water surface tension. The MF treatment caused an increase in the evaporated water amount from both surfactants. However, a greater effect was observed for cationic DoTAB. Because the hydrocarbon tail in both surfactants is the same (C12) the observed differences were assigned to the differences in their ionic heads. Gibbs adsorption equation and Lorentz force in the gradient MF were applied to explain the differences.

Properties of n-octyl-β-d-glucopyranoside and sodium dodecylsulfate mixed monolayer at the water-air interface

The measurements of the surface tension of the aqueous solution of n-octyl-β-d-glucopyranoside (OGP) and sodium dodecylsulfate (SDDS) mixtures were performed. From the obtained results the composition and density of the mixed surface layer, standard Gibbs free energy of adsorption and Gibbs free energy of the OGP and SDDS mixing in the surface layer were determined. These parameters were discussed based on the size of OGP and SDDS molecules as well as their contactable area at perpendicular and parallel orientations. These parameters were also discussed with regard to SDDS-SDDS, OGP-OGP and SDDS-OGP Gibbs free energy of interactions through the water phase. These interactions were determined on the basis of the components and parameters of the hydrophobic and hydrophilic parts of the surfactants molecules. Their values were compared to the parameter of the interactions between the SDDS and OGP molecules in the surface layer at the water-air interface. The negative values of this parameter suggest that there is the synergistic effect in the reduction of water surface tension by the OGP and SDDS mixture.

Introducing Speckled sugar bean (Phaseolus vulgaris) protein isolates as a new source of emulsifying agent

The present work was carried out to investigate the secondary structure of Speckled sugar bean protein isolates (SSBPI) as a new source for the formation of oil in water emulsions. For this purpose the structure and emulsifying properties of SSBPI were compared with other common bean protein isolates namely, Red mexican bean protein isolates (RMBPI) and Great northern bean protein isolates (GNBPI). Results showed that all proteins were rich in globulin with Phaseolin being the major protein fraction. These bean proteins had high acidic amino acids contents of glutamic and aspartic acids. The major building fractions for the secondary structure of all bean protein isolates were beta form structures (turn and sheet) and SSBPI had the highest and GNBPI possessed the lowest turn substructure. Comparison between different bean proteins exhibited that RMBPI had more fluorescence intensity yield followed by SSBPI and GNBPI. Among bean proteins, SSBPI had less surface hydrophobicity while GNBPI had the highest hydrophobic surface at pH 3 and 7. Surface tension was influenced by protein sources and RMBPI was more effective in the reduction of water surface tension compared to other bean proteins. Although SSBPI had better surface activity at oil-water interface no significant differences were observed between bean proteins. Among bean proteins, SSBPI had the highest electrical charge on the surface which promoted enough repulsion between emulsions oil droplets. Emulsions prepared with SSBPI had lower droplet size with narrow distribution compared to other bean proteins. Results revealed that SSBPI has a great potential to be used as a new source of food emulsifier.

Composition of Surface Layer at the Water\u2013Air Interface and Micelles of Triton X-100\xa0+\xa0Rhamnolipid Mixtures

Measurements of the surface tensions, densities and viscosities of aqueous solutions of Triton X-100 (TX-100) and rhamnolipid (RL) mixtures, at constant concentration of RL or TX-100, were carried out. The measured values of the surface tension were compared to those determined using different theoretical models and on the basis of the surface tension of aqueous solutions of individual surfactants. From the surface tension isotherms, the Gibbs surface excess concentration of TX-100 and RL, the composition of surface layer and the standard Gibbs free energy of adsorption at the water–air interface were determined. Moreover, on the basis of surface tension, density and viscosity isotherms, the CMC of surfactants mixtures were evaluated. From the density isotherms, apparent and partial molar volumes of TX-100 and RL were also determined. These volumes were compared to those calculated from the sizes of TX-100 and RL molecules. There was observed a synergetic effect in the reduction of water surface tension and micelle formation, which was confirmed by the intermolecular interactions parameter. In the case of micelle formation, this effect was discussed based on the standard Gibbs free energy of micellization as well as of TX-100 and RL mixing in the micelles. The synergism of TX-100 and RL mixtures in the reduction of water surface tension and micelle formation was explained on the basis of electrostatic interactions between the hydrophilic part of TX-100 and RL molecules; this was supported by pH measurements.

<b>Biosurfactants produced by <i>Microbacterium</i> sp., isolated from aquatic macrophytes in hydrocarbon-contaminated area in the Rio Negro, Manaus, Amazonas

Endophytic bacteria isolated from Eichhornia crassipes (Mart) Solms., collected in oil contaminated wastewater of effluent generated by Petrobras refinery in Manaus were investigated to determine their potential for producing biosurfactants. Assay with 2.6-dichlorophenol indophenol (DCPIP) indicator to verify hydrocarbon biodegradation activity; oil emulsification test; drop-collapse method; surface tension and growth curve of biosurfactant production. The M87 Microbacterium sp. strain chosen for this work was identified by the sequencing of the rDNA region and the chemical characterization was performed by FTIR, UFLC/MS and 1H RMN techniques. The selected bacterial isolate provided 3g L -1 of biosurfactant, using diesel oil as sole carbon source, being efficient in biodegrading oil as demonstrated by the DCPIP test. Fractions obtained by column chromatography were efficient in reducing water surface tension around 40 mN m -1 , especially fraction 1, which reduced it to 34.17 mN m -1 . The different techniques of chemical analysis used for the identification of the biosurfactant isolate indicated that this is probably a long - chain fatty acid lipid type, which may be used in the future as both biosurfactant in decontamination processes of hydrocarbon-polluted areas or as bioemulsifier in countless processes, since it exhibited no toxicity as determined by Alamar Blue assay.

Fischer–Tropsch synthesis over CNT-supported cobalt catalyst: effect of magnetic field

In the present work, the cobalt catalysts supported on carbon nanotubes (CNTs) were prepared by impregnation method in the presence and absence of magnetic field. The prepared catalysts were employed to yield higher hydrocarbons via Fischer–Tropsch synthesis. It is explored that using magnetized water can effectively change the catalyst geometry in impregnation catalyst preparation method. For the preparation of different sizes of cobalt particles on the CNTs support, the physical properties of solvent (water) in impregnation process were changed using the magnetizing process. The results showed that the average particle sizes of impregnated cobalt nanoparticles were decreased by using magnetized water in impregnation step. In addition, in the magnetized treated cobalt catalyst, the cobalt particles mostly dispersed outside the tubes because the capillary forces decreased by reducing water surface tension. Furthermore, the experimental results showed that the probability of chain growth (α) and selectivity to heavier hydrocarbons increased in magnetized water treatment catalysts.

Adsorption and Aggregation Activity of Sodium Dodecyl Sulfate and Rhamnolipid Mixture

Measurements of the surface tension, density and viscosity of sodium dodecyl sulfate (SDS) and rhamnolipid (RL) mixtures were carried out in aqueous solution. From the obtained results, composition of mixed surface layer at the water–air interface, mixed micelles, parameter of intermolecular interactions, activity of SDS and RL in the surface layer and micelles, Gibbs standard free energy of adsorption and micellization as well as Gibbs free energy of SDS and RL mixing in the surface layer and micelles were established. These parameters were discussed in the light of independent adsorption of SDS and RL and the size of their molecules as well as the area in contact with water molecules. A correlation between the number of water molecules in contact with those of SDS and RL and standard free energy of adsorption as well as micellization of these surfactants was observed. A correlation between the apparent and partial molar volumes of RL and SDS in their mixture and size of surfactant molecules as well as the average distance between molecules was also found. The parameter of intermolecular interactions indicates that there is a synergetic effect in the reduction of water surface tension and micelle formation.

Lipopeptides from Bacillus subtilis AC7 inhibit adhesion and biofilm formation of Candida albicans on silicone.

Candida albicans is the major fungus that colonises medical implants, causing device-associated infections with high mortality. Antagonistic bacterial products with interesting biological properties, such as biosurfactants, have recently been considered for biofilm prevention. This study investigated the activity of lipopeptide biosurfactant produced by Bacillus subtilis AC7 (AC7 BS) against adhesion and biofilm formation of C. albicans on medical-grade silicone elastomeric disks (SEDs). Chemical analysis, stability, surface activities of AC7 BS crude extract and physicochemical characterisation of the coated silicone disk surfaces were also carried out. AC7 BS showed a good reduction of water surface tension, low critical micelle concentration, good emulsification activity, thermal resistance and pH stability. Co-incubation with 2mgml(-1) AC7 BS significantly reduced adhesion and biofilm formation of three C. albicans strains on SEDs in a range of 67-69% and of 56-57%, respectively. On pre-coated SEDs, fungal adhesion and biofilm formation were reduced by 57-62% and 46-47%, respectively. Additionally, AC7 BS did not inhibit viability of C. albicans strains in both planktonic and sessile form. Chemical analysis of the crude extract revealed the presence of two families of lipopeptides, principally surfactin and a lower percentage of fengycin. The evaluation of surface wettability indicated that AC7 BS coating of SEDs surface was successful although uneven. AC7 BS significantly prohibits the initial deposition of C. albicans and slows biofilm growth, suggesting a potential role of biosurfactant coatings for preventing fungal infection associated with silicone medical devices.

Surface and volumetric properties of n-octyl-β-d-glucopyranoside and rhamnolipid mixture

The measurements of surface tension, density and viscosity of aqueous solutions of n-octyl-β-d-glucopyranoside (OGP) and rhamnolipid (RL) were performed at constant concentration of OGP or RL. The measured values of the surface tension were compared to those calculated from the Joos equation as well as to the hypothetical one. The obtained results were analyzed with regard to adsorption at the water-air interface and micellization of OGP in the presence of RL and vice versa. On the basis of this analysis, the Gibbs surface excess concentration of the particular surfactants at the water-air interface, the Gibbs surface free energy of adsorption and micellization, the composition of the surface layer, the apparent and partial molar volumes of OGP and RL were determined. The Gibbs surface free energy of adsorption was calculated on the basis of the critical micelle concentration (CMC) and the surface tension values at this concentration as well as by using the Langmuir equation. The composition of the surface layer was compared to that of hypothetical one. In turn, apparent and partial molar volumes were discussed in the light of the volume of surfactant molecules on the basis of the length and angle of the bonds. From the obtained results it was deduced that there is a strong synergism in the reduction of water surface tension by the OGP and RL mixture as well as in the CMC. The adsorption of RL increases in the presence of OGP but OGP decreases in the presence of RL.

Optimization of cultural conditions for biosurfactant production by Pleurotus djamor in solid state fermentation

Being eco-friendly, less toxic, more biodegradable and biocompatible, biological surfactants have higher activity and stability compared to synthetic ones. In spite of the fact that there are abundant benefits of biosurfactants over the synthetic congeners, the problem related with the economical and large scale production proceeds. The utilization of several industrial wastes in the production media as substrates reduces the production cost. This current study aims optimization of biosurfactant production conditions by Pleurotus djamor, grown on sunflower seed shell, grape wastes or potato peels as renewable cheap substrates in solid state fermentation. After determination of the best substrate for biosurfactant production, we indicate optimum size and amount of solid substrate, volume of medium, temperature, pH and Fe(2+) concentrations on biosurfactant production. In optimum conditions, by reducing water surface tension to 28.82±0.3mN/m and having oil displacement diameter of 3.9±0.3cm, 10.205±0.5g/l biosurfactant was produced. Moreover, chemical composition of biosurfactant produced in optimum condition was determined by FTIR. Lastly, laboratory's large-scale production was carried out in optimum conditions in a tray bioreactor designed by us and 8.9±0.5g/l biosurfactant was produced with a significant surface activity (37.74±0.3mN/m). With its economical suggestions and applicability of laboratory's large-scale production, this work indicates the possibility of using low cost agro-industrial wastes as renewable substrates for biosurfactant production. Therefore, using economically produced biosurfactant will reduce cost in several applications such as bioremediation, oil recovery and biodegradation of toxic chemicals.

Behaviour of cetyltrimethylammonium bromide, Triton X-100 and Triton X-114 in mixed monolayer at the (water–air) interface

The measured values of the surface tension of aqueous solution of binary and ternary mixtures including CTAB, TX-100 and TX-114 were compared to those calculated from the Joos equation modified by us. It appeared that it is possible to predict, at the first approximation, the changes of the surface tension of aqueous solutions studied as a function of concentration of all possible binary and ternary mixtures in the range from 0 to the minimal value of their surface tension. However, the deviations of the calculated values of surface tension from those measured depend on the synergetic effect in the reduction of water surface tension. This effect was established by the values of the molecular interaction parameter calculated from the Rosen and Hua equations. From these equations the relative mole fraction of three surfactants in the mixed monolayer at the (water–air) interface was also determined and compared to that obtained by using surface excess concentrations of particular surfactants in this monolayer. As follows from this comparison the Rosen and Hua equations give the proper relation between the mole fraction of TX-100, TX-114 and CTAB in the monolayer but on the condition it is determined at the same concentration of each surfactant in the mixture. The synergetic effect of ternary mixture in the reduction of the water surface tension is also reflected in the changes of the values of the Gibbs standard free energy of adsorption which was determined by using the Langmuir and Gu and Zhu equations. It appeared that the Gu and Zhu isotherm of adsorption proposed for the solid-solution interface is also useful for determination of the Gibbs standard free energy of adsorption at the (water–air) one.

Foam properties and detergent abilities of the saponins from Camellia oleifera.

The defatted seed meal of Camellia oleifera has been used as a natural detergent and its extract is commercially utilized as a foam-stabilizing and emulsifying agent. The goal of this study was to investigate the foam properties and detergent ability of the saponins from the defatted seed meal of C. oleifera. The crude saponin content in the defatted seed meal of C. oleifera was 8.34 and the total saponins content in the crude saponins extract was 39.5% (w/w). The foaming power of the 0.5 crude saponins extract solution from defatted seed meal of C. oleifera was 37.1 of 0.5 SLS solution and 51.3% to that of 0.5% Tween 80 solution. The R5 value of 86.0% represents good foam stability of the crude saponins extracted from the defatted seed meal of the plant. With the reduction of water surface tension from 72 mN/m to 50.0 mN/m, the 0.5% crude saponins extract solution has wetting ability. The sebum-removal experiment indicated that the crude saponins extract has moderate detergency. The detergent abilities of the saponins from C. oleifera and Sapindus mukorossi were also compared.