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Lu Y, Zhang Y, Zhang R, Gao Y, Miao S, Mao L. Different interfaces for stabilizing liquid-liquid, liquid-gel and gel-gel emulsions: Design, comparison, and challenges. Food Res Int 2024; 187:114435. [PMID: 38763682 DOI: 10.1016/j.foodres.2024.114435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Revised: 04/23/2024] [Accepted: 04/27/2024] [Indexed: 05/21/2024]
Abstract
Interfaces play essential roles in the stability and functions of emulsion systems. The quick development of novel emulsion systems (e.g., water-water emulsions, water-oleogel emulsions, hydrogel-oleogel emulsions) has brought great progress in interfacial engineering. These new interfaces, which are different from the traditional water-oil interfaces, and are also different from each other, have widened the applications of food emulsions, and also brought in challenges to stabilize the emulsions. We presented a comprehensive summary of various structured interfaces (stabilized by mixed-layers, multilayers, particles, nanodroplets, microgels etc.), and their characteristics, and designing strategies. We also discussed the applicability of these interfaces in stabilizing liquid-liquid (water-oil, water-water, oil-oil, alcohol-oil, etc.), liquid-gel, and gel-gel emulsion systems. Challenges and future research aspects were also proposed regarding interfacial engineering for different emulsions. Emulsions are interface-dominated materials, and the interfaces have dynamic natures, as the compositions and structures are not constant. Biopolymers, particles, nanodroplets, and microgels differed in their capacity to get absorbed onto the interface, to adjust their structures at the interface, to lower interfacial tension, and to stabilize different emulsions. The interactions between the interface and the bulk phases not only affected the properties of the interface, but also the two phases, leading to different functions of the emulsions. These structured interfaces have been used individually or cooperatively to achieve effective stabilization or better applications of different emulsion systems. However, dynamic changes of the interface during digestion are only poorly understood, and it is still challenging to fully characterize the interfaces.
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Affiliation(s)
- Yao Lu
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China; Food Colloids and Bioprocessing Group, School of Food Science and Nutrition, University of Leeds, Leeds LS2 9JT, UK
| | - Yanhui Zhang
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Ruoning Zhang
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Yanxiang Gao
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Song Miao
- Teagasc Food Research Centre, Moorepark, Fermoy, Co. Cork, Ireland
| | - Like Mao
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China.
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Hazt B, Pereira Parchen G, Fernanda Martins do Amaral L, Rondon Gallina P, Martin S, Hess Gonçalves O, Alves de Freitas R. Unconventional and conventional Pickering emulsions: Perspectives and challenges in skin applications. Int J Pharm 2023; 636:122817. [PMID: 36905974 DOI: 10.1016/j.ijpharm.2023.122817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 02/27/2023] [Accepted: 03/06/2023] [Indexed: 03/13/2023]
Abstract
Pickering emulsions are free from molecular and classical surfactants and are stabilized by solid particles, creating long-term stability against emulsion coalescence. Additionally, these emulsions are both environmentally and skin-friendly, creating new and unexplored sensorial perceptions. Although the literature mostly describes conventional emulsions (oil-in-water), there are unconventional emulsions (multiple, oil-in-oil and water-in-water) with excellent prospects and challenges in skin application as oil-free systems, permeation enhancers and topical drug delivery agents, with various possibilities in pharmaceutical and cosmetic products. However, up to now, these conventional and unconventional Pickering emulsions are not yet available as commercial products. This review brings to the discussion some important aspects such as the use of phases, particles, rheological and sensorial perception, as well as current trends in the development of these emulsions.
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Affiliation(s)
- Bianca Hazt
- Chemistry Department, Universidade Federal do Paraná (UFPR), R. Coronel F. H. dos Santos, 210, Curitiba - 81531-980, PR, Brazil.
| | - Gabriela Pereira Parchen
- Department of Pharmacy, Universidade Federal do Paraná (UFPR), Av. Pref. Lothário Meissner, 632, Curitiba - 80210-170, PR, Brazil.
| | | | - Patrícia Rondon Gallina
- Department of Pharmacy, Universidade Federal do Paraná (UFPR), Av. Pref. Lothário Meissner, 632, Curitiba - 80210-170, PR, Brazil
| | - Sandra Martin
- Mackenzie School of Medicine, R. Padre Anchieta, 2770, Curitiba - 80730-000, PR, Brazil
| | - Odinei Hess Gonçalves
- Centro de Investigação de Montanha (CIMO), Instituto Politécnico de Bragança, Campus de Santa Apolónia, 5300-253 Bragança, Portugal; Post-Graduation Program of Food Technology, Federal University of Technology - Paraná, Via Rosalina Maria Dos Santos, 1233, Campo Mourão - 87301-899, PR, Brazil.
| | - Rilton Alves de Freitas
- Department of Pharmacy, Universidade Federal do Paraná (UFPR), Av. Pref. Lothário Meissner, 632, Curitiba - 80210-170, PR, Brazil.
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Recent Advances in Pickering Double Emulsions and Potential Applications in Functional Foods: A Perspective Paper. Foods 2023; 12:foods12050992. [PMID: 36900509 PMCID: PMC10001147 DOI: 10.3390/foods12050992] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2022] [Revised: 02/13/2023] [Accepted: 02/24/2023] [Indexed: 03/02/2023] Open
Abstract
Double emulsions are complex emulsion systems with a wide range of applications across different fields, such as pharmaceutics, food and beverage, materials sciences, personal care, and dietary supplements. Conventionally, surfactants are required for the stabilization of double emulsions. However, due to the emerging need for more robust emulsion systems and the growing trends for biocompatible and biodegradable materials, Pickering double emulsions have attracted increasing interest. In comparison to double emulsions stabilized solely by surfactants, Pickering double emulsions possess enhanced stability due to the irreversible adsorption of colloidal particles at the oil/water interface, while adopting desired environmental-friendly properties. Such advantages have made Pickering double emulsions rigid templates for the preparation of various hierarchical structures and as potential encapsulation systems for the delivery of bioactive compounds. This article aims to provide an evaluation of the recent advances in Pickering double emulsions, with a special focus on the colloidal particles employed and the corresponding stabilization strategies. Emphasis is then devoted to the applications of Pickering double emulsions, from encapsulation and co-encapsulation of a wide range of active compounds to templates for the fabrication of hierarchical structures. The tailorable properties and the proposed applications of such hierarchical structures are also discussed. It is hoped that this perspective paper will serve as a useful reference on Pickering double emulsions and will provide insights toward future studies in the fabrication and applications of Pickering double emulsions.
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Mohammed ASY, Dyab AKF, Taha F, Abd El-Mageed AIA. Pollen-derived microcapsules for aspirin microencapsulation: in vitro release and physico-chemical studies. RSC Adv 2022; 12:22139-22149. [PMID: 36043102 PMCID: PMC9364082 DOI: 10.1039/d2ra02888c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Accepted: 07/28/2022] [Indexed: 01/18/2023] Open
Abstract
Aspirin, also known as acetylsalicylic acid (ASA), is one of the most crucial therapies needed and/or used in a basic health system. Using biocompatible materials to encapsulate ASA would improve its therapeutic efficacy and reduce its side effects via controlled release in physiological environments. Consequently, we explore in this study the feasibility of encapsulation of ASA into robust Lycopodium clavatum L. sporopollenin (LCS) microcapsules. After extracting sporopollenin from their natural micrometer-sized raw spores, the physico-chemical features of the extracted sporopollenin, pure ASA, and sporopollenin loaded with ASA were characterised using various methods, including optical microscopy, Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible (UV-vis.) spectroscopy, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and X-ray diffraction (XRD). Additionally, we demonstrate the in vitro release profile of ASA in a triggered gastrointestinal environment utilizing kinetics analysis to investigate the mechanism of release. The LCS microcapsules were found to be excellent encapsulants for the crucial ASA drug and achieved controlled in vitro release, that would enable further investigations to rationally design versatile controlled delivery platforms.
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Affiliation(s)
- Al-Shymaa Y Mohammed
- Colloids & Advanced Materials Group, Chemistry Department, Faculty of Science, Minia University Minia 61519 Egypt
| | - Amro K F Dyab
- Colloids & Advanced Materials Group, Chemistry Department, Faculty of Science, Minia University Minia 61519 Egypt
| | - Fouad Taha
- Colloids & Advanced Materials Group, Chemistry Department, Faculty of Science, Minia University Minia 61519 Egypt
| | - Ahmed I A Abd El-Mageed
- Chemistry Department, Faculty of Science, GALALA University Galala City Suez 43711 Egypt
- Colloids & Advanced Materials Group, Chemistry Department, Faculty of Science, Minia University Minia 61519 Egypt
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Kotnik T, Žerjav G, Pintar A, Žagar E, Kovačič S. Azine- and imine-linked conjugated polyHIPEs through Schiff-base condensation reaction. Polym Chem 2022. [DOI: 10.1039/d1py01467f] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A new alternative synthetic route to the transition-metal free π-conjugated polyHIPEs is reported, which combines the Schiff-base condensation reaction and an emulsion-templating technology.
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Affiliation(s)
- Tomaž Kotnik
- National Institute of Chemistry, Department of Polymer Chemistry and Technology, Hajdrihova 19, SI-1001 Ljubljana, Slovenia
| | - Gregor Žerjav
- National Institute of Chemistry, Department of Inorganic Chemistry and Technology, Hajdrihova 19, SI-1001 Ljubljana, Slovenia
| | - Albin Pintar
- National Institute of Chemistry, Department of Inorganic Chemistry and Technology, Hajdrihova 19, SI-1001 Ljubljana, Slovenia
| | - Ema Žagar
- National Institute of Chemistry, Department of Polymer Chemistry and Technology, Hajdrihova 19, SI-1001 Ljubljana, Slovenia
| | - Sebastijan Kovačič
- National Institute of Chemistry, Department of Polymer Chemistry and Technology, Hajdrihova 19, SI-1001 Ljubljana, Slovenia
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Kotnik T, Žerjav G, Pintar A, Žagar E, Kovačič S. Highly Porous Poly(arylene cyano-vinylene) Beads Derived through the Knoevenagel Condensation of the Oil-in-Oil-in-Oil Double Emulsion Templates. ACS Macro Lett 2021; 10:1248-1253. [PMID: 35549042 DOI: 10.1021/acsmacrolett.1c00457] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Conjugated porous polymers through the emulsion-templating polymerization process are typically prepared as monoliths, and the emulsions are cured via metal-catalyzed cross-coupling reactions. Herein, we report the design and synthesis of well-defined, millimeter-sized conjugated porous polymer beads by combining an oil-in-oil-in-oil (O/O/O) double emulsion as a de novo template and an amino-catalyzed Knoevenagel condensation reaction as a polymerization chemistry to cure such emulsions. The 1,4-phenylenediacetonitrile is reacted with aromatic multialdehydes in the presence of piperidine, and a series of metal-free poly(arylene cyano-vinylene) beads are prepared. All beads exhibit 3D-interconnected microcellular morphology and substantial semiconducting properties, such as strong light harvesting ability in the visible light region with electrochemical band gaps in the range of 2.05-2.33 eV. Finally, the promising photocatalytic activity of these conjugated beads is demonstrated for a model sulfoxidation reaction under visible light irradiation, and near quantitative conversions with excellent chemoselectivities (>99%) are obtained.
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Affiliation(s)
- Tomaž Kotnik
- National Institute of Chemistry, Department of Polymer Chemistry and Technology, Hajdrihova 19, 1000 Ljubljana, Slovenia
| | - Gregor Žerjav
- National Institute of Chemistry, Department of Inorganic Chemistry and Technology, Hajdrihova 19, 1000 Ljubljana, Slovenia
| | - Albin Pintar
- National Institute of Chemistry, Department of Inorganic Chemistry and Technology, Hajdrihova 19, 1000 Ljubljana, Slovenia
| | - Ema Žagar
- National Institute of Chemistry, Department of Polymer Chemistry and Technology, Hajdrihova 19, 1000 Ljubljana, Slovenia
| | - Sebastijan Kovačič
- National Institute of Chemistry, Department of Polymer Chemistry and Technology, Hajdrihova 19, 1000 Ljubljana, Slovenia
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Zia A, Pentzer E, Thickett S, Kempe K. Advances and Opportunities of Oil-in-Oil Emulsions. ACS APPLIED MATERIALS & INTERFACES 2020; 12:38845-38861. [PMID: 32805925 DOI: 10.1021/acsami.0c07993] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Emulsions are mixtures of two immiscible liquids in which droplets of one are dispersed in a continuous phase of the other. The most common emulsions are oil-water systems, which have found widespread use across a number of industries, for example, in the cosmetic and food industries, and are also of advanced scientific interest. In addition, the past decade has seen a significant increase in both the design and application of nonaqueous emulsions. This has been primarily driven by developments in understanding the mechanism of effective stabilization of oil-in-oil (o/o) systems, either using block copolymers (BCPs) or solid (Pickering) particles with appropriate surface functionality. These systems, as highlighted in this review, have enabled emergent applications in areas such as pharmaceutical delivery, energy storage, and materials design (e.g., polymerization, monolith, and porous polymer synthesis). These o/o emulsions complement traditional emulsions that utilize an aqueous phase and allow the use of materials incompatible with water. We assess recent advances in the preparation and stabilization of o/o emulsions, focusing on the identity of the stabilizer (BCP or particle), the interplay between stabilizer and oils, and highlighting applications and opportunities associated with o/o emulsions.
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Affiliation(s)
- Aadarash Zia
- ARC Centre of Excellence in Convergent Bio-Nano Science & Technology and Drug Delivery Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria 3052, Australia
| | - Emily Pentzer
- Department of Chemistry, Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77807, United States
| | - Stuart Thickett
- School of Natural Sciences (Chemistry), The University of Tasmania, Hobart, Tasmania 7001 Australia
| | - Kristian Kempe
- ARC Centre of Excellence in Convergent Bio-Nano Science & Technology and Drug Delivery Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria 3052, Australia
- Materials Science and Engineering, Monash University, Clayton, Victoria 3800, Australia
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