Rheology and stability of oil-in-water nanoemulsions stabilised by anionic surfactant and gelatin 2) addition of homologous series of sugar-based co-surfactants

Howe, Andrew M.; Pitt, A. R.

doi:10.1016/j.cis.2008.08.004

Cited by 24 publications

(3 citation statements)

References 31 publications

(38 reference statements)

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“…Figure 2), SPI emulsion formed large floccules and the size the 362 majority of the droplets in the WPC emulsion was too big to be encapsulated within the 363 generated smaller microcapsules. Although the effective volume of the droplet is 364 significantly increased by the absorbed proteins on their surface (Howe & Pitt, 2008;365 Malaki Nik et al, 2010), which means that the actual oil volume is smaller than the 366 apparent droplet size, some of the droplets in WPC and the floccules in SPI were still 367 too big for microcapsule formation. 368…”

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confidence: 99%

Protein-based emulsion electrosprayed micro- and submicroparticles for the encapsulation and stabilization of thermosensitive hydrophobic bioactives

Gómez‐Mascaraque

López‐Rubio

2016

Journal of Colloid and Interface Science

130

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This work shows the potential of emulsion electrospraying of proteins using food-grade emulsions for the microencapsulation and enhanced protection of a model thermosensitive hydrophobic bioactive. Specifically, gelatin, a whey protein concentrate (WPC) and a soy protein isolate (SPI) were compared as emulsion stabilizers and wall matrices for encapsulation of α-linolenic acid. In a preliminary stage, soy bean oil was used as the hydrophobic component for the implementation of the emulsion electrospraying process, investigating the effect of protein type and emulsion protocol used (i.e. with or without ultrasound treatment) on colloidal stability. This oil was then substituted by the ω-3 fatty acid and the emulsions were processed by electrospraying and spray-drying, comparing both techniques. While the latter resulted in massive bioactive degradation, electrospraying proved to be a suitable alternative, achieving microencapsulation efficiencies (MEE) of up to ∼70%. Although gelatin yielded low MEEs due to the need of employing acetic acid for its processing by electrospraying, SPI and WPC achieved MEEs over 60% for the non-sonicated emulsions. Moreover, the degradation of α-linolenic acid at 80°C was significantly delayed when encapsulated within both matrices. Whilst less than an 8% of its alkene groups were detected after 27h of thermal treatment for free α-linolenic acid, up to 43% and 67% still remained intact within the electrosprayed SPI and WPC capsules, respectively.

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confidence: 99%

Protein-based emulsion electrosprayed micro- and submicroparticles for the encapsulation and stabilization of thermosensitive hydrophobic bioactives

Gómez‐Mascaraque

López‐Rubio

2016

Journal of Colloid and Interface Science

130

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“…-Stabilizing agents to prevent separations, e.g., avoiding sedimentation, coagulation, flocculation, coalescence, precipitation, etc. [23,43,[61][62][63]; -Stabilizing agents that form new stable structures, e.g., producing micelles or more complex aggregations such as liquid crystals, vesicles, liposomes, etc. [64][65][66][67]; -Destabilizing agents, e.g., destroying association, sometimes using surfactants to attain the so-called optimal formulation [56,68]; -Compatible agents that allow very complex effects, e.g., to change the wettability of a solid surface or make compatible components that usually would separate [69,70].…”

Section: Formulation Of a Complex Productmentioning

confidence: 99%

Formulation in Surfactant Systems: From-Winsor-to-HLDN

et al. 2022

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Formulation is an ancient concept, although the word has been used only recently. The first formulations made our civilization advance by inventing bronze, steel, and gunpowder; then, it was used in medieval alchemy. When chemistry became a science and with the golden age of organic synthesis, the second formulation period began. This made it possible to create new chemical species and new combinations “à la carte.” However, the research and developments were still carried out by trial and error. Finally, the third period of formulation history began after World War II, when the properties of a system were associated with its ingredients and the way they were assembled or combined. Therefore, the formulation and the systems’ phenomenology were related to the generation of some synergy to obtain a commercial product. Winsor’s formulation studies in the 1950s were enlightening for academy and industries that were studying empirically surfactant-oil-water (SOW) systems. One of its key characteristics was how the interfacial interaction of the adsorbed surfactant with oil and water phases could be equal by varying the physicochemical formulation of the system. Then, Hansen’s solubility parameter in the 1960s helped to reach a further understanding of the affinity of some substances to make them suitable to oil and water phases. In the 1970s, researchers such as Shinoda and Kunieda, and different groups working in Enhanced Oil Recovery (EOR), among them Schechter and Wade’s group at the University of Texas, made formulation become a science by using semiempirical correlations to attain specific characteristics in a system (e.g., low oil-water interfacial tension, formulation of a stable O/W or W/O emulsion, or high-performance solubilization in a bicontinuous microemulsion system at the so-called optimum formulation). Nowadays, over 40 years of studies with the hydrophilic-lipophilic deviation equation (HLD) have made it feasible for formulators to improve products in many different applications using surfactants to attain a target system using HLD in its original or its normalized form, i.e., HLDN. Thus, it can be said that there is still current progress being made towards an interdisciplinary applied science with numerical guidelines. In the present work, the state-of-the-art of formulation in multiphase systems containing two immiscible phases like oil and water, and therefore systems with heterogeneous or micro-heterogeneous interfaces, is discussed. Surfactants, from simple to complex or polymeric, are generally present in such systems to solve a wide variety of problems in many areas. Some significant cases are presented here as examples dealing with petroleum, foods, pharmaceutics, cosmetics, detergency, and other products occurring as dispersions, emulsions, or foams that we find in our everyday lives.

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“…In O/W emulsions, flocculation indeed often occurs, although stabler O/W emulsions have shown diminished flocculation. Apart from variables of droplet size, other variables such as temperature, pH, ionic content, and the oil volume fraction can be manipulated for better stabilization in O/W emulsions [35,36], and stabilizers such as emulsifiers and surfactants can be used to the same end. As such, O/W emulsions are utilized in drilling in the oil and gas industry, where emulsion-based muds are used for their excellent performance in lubricants, wellbore stabilizers, filtration, and stabilizers for solids, salts, and acid contamination.…”

Section: O/w Emulsionsmentioning

confidence: 99%

Utilization of lignocellulosic biomass: A practical journey towards the development of emulsifying agent

Safian

Sekeri

Yaqoob

et al. 2022

Talanta

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Rheology and stability of oil-in-water nanoemulsions stabilised by anionic surfactant and gelatin 2) addition of homologous series of sugar-based co-surfactants

Cited by 24 publications

References 31 publications

Protein-based emulsion electrosprayed micro- and submicroparticles for the encapsulation and stabilization of thermosensitive hydrophobic bioactives

Protein-based emulsion electrosprayed micro- and submicroparticles for the encapsulation and stabilization of thermosensitive hydrophobic bioactives

Formulation in Surfactant Systems: From-Winsor-to-HLDN

Utilization of lignocellulosic biomass: A practical journey towards the development of emulsifying agent

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