Self-assembly behaviour of alkylpolyglucosides (APG) in mixed surfactant-stabilized emulsions system

Jiang, Lim Chaw; Basri, Mahiran; Omar, Dzolkhifli; Rahman, Mohd Basyaruddin Abdul; Salleh, Abu Bakar; Rahman, Raja Noor Zaliha Raja Abdul

doi:10.1016/j.molliq.2010.11.015

Cited by 41 publications

(23 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Surface tension results reveal two breaks in the plot indicating two critical micelle concentrations: the first critical micelle concentration (CMC) at 0.3 m m indicates the formation of spherical micelles, and the second surface tension break at 5.0 m m indicates a transition from these spherical ones to rodlike formation. This micelle shape phenomenon is typical of mixed APG surfactant systems (Fig. ).…”

Section: Resultsmentioning

confidence: 68%

Enzyme Activity and Structural Dynamics Linked to Micelle Formation: A Fluorescence Anisotropy and ESR Study

Chin

Somasundaran

2013

Photochem & Photobiology

View full text Add to dashboard Cite

Activities of the enzymes, protease subtilisin and horse radish peroxidase (HRP) have been increased 50 and 40%, respectively, in the presence of the nonionic surfactant, alkyl polyglucoside, compared with the activities in buffer alone. This enzyme hyperactivity reaches a peak at 3.0 mm of surfactant. Investigation into the structure of surfactant aggregates indicates "giant" micelle superstructures at this range of surfactant concentration of 1.7 μm in diameter--dramatically decreasing to 60 and 70 nm at higher surfactant concentrations, while surface tension measurements indicate two critical micelle concentration inflection points at 0.2 and 5.0 mm, which suggests transitions in micelle structure with respect to concentration. Furthermore, electron spin resonance (ESR) indicates that the micelles in first critical micelle concentration regime are loosely packed relative to the second aggregate phase. We hypothesize that this loose packing results in diminished hydration shell repulsion between the micelles, leading to the large, micrometer-sized aggregates. We further hypothesize that it is the interaction with these loosely packed micelles that affects the flexibility of the HRP and protease enzyme structure. Time-resolved fluorescence anisotropy of subtilisin in Brij-30 indicates increasing flexibility of catalytic active site with surfactant concentration. This is correlated with an increase in enzymatic activity.

show abstract

Section: Resultsmentioning

confidence: 68%

Enzyme Activity and Structural Dynamics Linked to Micelle Formation: A Fluorescence Anisotropy and ESR Study

Chin

Somasundaran

2013

Photochem & Photobiology

View full text Add to dashboard Cite

show abstract

“…In the experimental frequency range, a plateau region was observed. This may be ascribed to the extensive flocculation of the surfactant molecules at the o/w interface under shear (Jiang et al, ). In the plateau region, tan δ passes through a minimum, which is characterized by the plateau modulus (

G_{P}^{0}

).…”

Section: Resultsmentioning

confidence: 99%

Synergistic Influence of pH and Temperature on Rheological Behavior of Adhesive Emulsions Stabilized with Micelle Dispersion of an Anionic Surfactant

Kundu

Kumar

Scales

et al. 2018

J Surfact & Detergents

View full text Add to dashboard Cite

The influence of emulsion pH and temperature on the rheological behavior of adhesive oil-in-water (o/w) emulsions stabilized with an anionic surfactant (sodium dodecyl benzene sulfonate, SDBS) was studied. The flow properties of emulsions as a complex fluid were investigated using steady and dynamic rheometry for characterization of non-Newtonian behavior. Emulsion pH was varied from 2 to 12 and temperature was varied from 20 to 50 C, respectively. The influences of the above-mentioned variables on the rheology of o/w emulsion were studied using steady-shear and dynamic oscillatory experiments. Various viscosity models (2, 3, and 4 parameter rheological model) were used to predict the rheological parameters. An increase in the pH of the emulsion led to an increase in the emulsion stability, viscosity, and viscoelastic properties (G 0 , G 00 , η*, and tan δ), and a decrease in the mean droplet size of the emulsion. A decrease in the temperature yields higher values of steady-shear viscosity and viscoelastic properties upon a decrease in droplet size. Emulsions were characterized as flocculated structured liquid exhibiting a characteristic crossover frequency (ω*) within the range of angular frequency studied in oscillatory measurements. Overall, emulsions exhibited non-Newtonian shearthinning behavior and the synergy of pH and temperature significantly influences the emulsion rheology. Different o/w emulsions were prepared with 30% (v/v) light petroleum oil. The emulsions were prepared by rigorous shearing of the oil and water in a high-shear mixer at 30 C. An anionic surfactant (SDBS) was used as a surfactant for the preparation of o/w emulsion. The surfactant concentration was fixed at 1 wt.%. The o/w emulsions were 302 J Surfact Deterg J Surfact Deterg (2019) 22: 301-313 50 21.33 --303 J Surfact Deterg J Surfact Deterg (2019) 22: 301-313 P ; G C Fig. 5 Time-dependent behavior (η a − t plot) of adhesive (o/w) emulsions at different pH 309 J Surfact Deterg J Surfact Deterg (2019) 22: 301-313

show abstract

“…The surface tension of PHNE and PHCE at different concentration was measured at 25 with Kruss tensiometer Kruss, UK , using a platinum plate as referred to the Du Noüy ring method 16 . In every set of measurement, the plate was first rinsed with distilled water and heated to red-orange colour to clean it.…”

Section: Surface Tension Masurementmentioning

confidence: 99%

Optimization and Characterization of Palm Oil-based Nanoemulsion Loaded with <i>Parthenium hysterophorus</i> Crude Extract for Natural Herbicide Formulation

et al. 2019

Self Cite

View full text Add to dashboard Cite

Introduction Parthenium hysterophorus is one of the world s seven most devastating and aggressive weed commonly known as carrot grass and bitter weed 1. The Asteraceae family belonging weeds were often spotted on abandoned lands, drainage and railway tracks. Parthenium hysterophorus contained allelochemical parthenin which play as a major phytotoxic compound in the plant. Allelochemical is a chemical compound that influences growth, survival, and reproduction of other organism 2. Due to its noxious ability, P. hysterophorus could be exploited as a potential bioactive component in herbicide formulation for natural weed management 3 .

show abstract

Self-assembly behaviour of alkylpolyglucosides (APG) in mixed surfactant-stabilized emulsions system

Cited by 41 publications

References 32 publications

Enzyme Activity and Structural Dynamics Linked to Micelle Formation: A Fluorescence Anisotropy and ESR Study

Enzyme Activity and Structural Dynamics Linked to Micelle Formation: A Fluorescence Anisotropy and ESR Study

Synergistic Influence of pH and Temperature on Rheological Behavior of Adhesive Emulsions Stabilized with Micelle Dispersion of an Anionic Surfactant

Optimization and Characterization of Palm Oil-based Nanoemulsion Loaded with <i>Parthenium hysterophorus</i> Crude Extract for Natural Herbicide Formulation

Contact Info

Product

Resources

About