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Liu S, Hu Y, Xia J, Li N, Fan H, Duan M. The attraction between like-charged oil-in-water emulsion droplets induced by ionic micelles. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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2
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Rheological Characterization and Quality of Emulsions Based on Fats Produced during the Reaction Catalyzed by Immobilized Lipase from Rhizomucor Miehei. Catalysts 2022. [DOI: 10.3390/catal12060649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
It has been shown that structured lipids, formed in the process of enzymatic modification of natural hard fat with walnut oil, are capable of stabilizing emulsion systems without the need to add additional emulsifiers. This is especially true for emulsions containing fat formed during enzymatic modification when the amount of added water to the reaction catalyst was in the range of 12–16 wt%. Physicochemical evaluations, i.e., the average particle size, its growth, distribution, and dispersity coefficient, were comparable with the reference emulsion where the emulsifier was lecithin, well-known for its emulsifying properties. Microstructure studies also confirmed the above observations. Rheological studies performed on a set of emulsions containing structured lipids of variable composition confirmed that interesterified lipid blends can be directly utilized as a fat base in the preparation of stable emulsions. The consistency, thixotropic behavior, long-term shelf life, and thermal stability of these emulsions were found to be comparable to systems stabilized with conventional emulsifiers, i.e., sunflower lecithine. Our approach offers the opportunity for the preparation of stable emulsion systems, free from additional emulsifiers, for the food or cosmetics industry, which is extremely important from the point of view of the preparation of products free from allergens.
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3
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Thin film breakage in oil–in–water emulsions, a multidisciplinary study. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2021.127808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Onaizi SA. Effect of salinity on the characteristics, pH-triggered demulsification and rheology of crude oil/water nanoemulsions. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2021.119956] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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5
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Ward R, Ravindran S, R Otazo M, Cradock B, Avci E, Gillies G, Coker C, Williams MAK. Inside the ensemble: unlocking the potential of one-at-a-time experiments with lab-on-a-chip automation. LAB ON A CHIP 2021; 21:4401-4413. [PMID: 34633401 DOI: 10.1039/d1lc00601k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The advent of technologies that allow the interactions of individual microscopic particles to be probed "one-at-a-time" has paved the way for new experimental avenues of enquiry in colloidal systems. For example, investigating whether a particular pair of colloidal particles isolated from a macroscopic sample might adhere to each other when brought into close proximity is certainly possible. However, given the probabilistic nature of the process (different particles within the ensemble may have slightly different surface charge distributions and asperities, and interaction energies involved can be close to thermal values), it is important that many hundreds or thousands of pairs of particles are tested under each set of experimental conditions of interest. Currently it is still an arduous task to perform such an experiment a sufficient number of times in order to acquire a data-set that truly represents the ensemble. Herein an automated particle collider for measuring particle-particle interactions has been realized by combining elements of microfluidics, holographic optical tweezers and image processing. Each individual measurement consists of confining two particles within a predetermined chemical micro-environment, and observing whether their interactions lead to aggregation. To automate the measurements, computer software consisting of LabVIEW and Red Tweezers with a custom plugin was used. Preliminary experiments carried out using 1 μm diameter polystyrene particles demonstrated that many hundreds of pairwise-interaction measurements could be carried out autonomously within a matter of hours. Further exemplar real-world experiments, designed to examine the stickiness of emulsion drops as a function of bulk measurements of the ζ-potential (zeta potential) of the sample, were then performed. It is envisaged that such robust approaches to the automation of "one-at-a-time" experiments will find applications in a large number of areas, and enable previously unthinkable experiments to be carried out in a timely fashion, thus allowing the focus to shift away from tedious experimental frustrations to more profound scientific questions.
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Affiliation(s)
- Rob Ward
- School of Fundamental Sciences, Massey University, Palmerston North, New Zealand.
| | - Sapna Ravindran
- School of Fundamental Sciences, Massey University, Palmerston North, New Zealand.
| | - Mariela R Otazo
- School of Fundamental Sciences, Massey University, Palmerston North, New Zealand.
| | - Braden Cradock
- School of Food and Advanced Technology, Massey University, Palmerston North, New Zealand
| | - Ebubekir Avci
- School of Food and Advanced Technology, Massey University, Palmerston North, New Zealand
- MacDiarmid Institute for Advanced Materials and Nanotechnology, New Zealand
| | - Graeme Gillies
- Fonterra Co-operative Group Ltd, Palmerston North, New Zealand
| | - Christina Coker
- Fonterra Co-operative Group Ltd, Palmerston North, New Zealand
| | - Martin A K Williams
- School of Fundamental Sciences, Massey University, Palmerston North, New Zealand.
- MacDiarmid Institute for Advanced Materials and Nanotechnology, New Zealand
- Riddet Institute, Massey University, Palmerston North, New Zealand
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Resende MT, Osheter T, Linder C, Wiesman Z. Proton Low Field NMR Relaxation Time Domain Sensor for Monitoring of Oxidation Stability of PUFA-Rich Oils and Emulsion Products. Foods 2021; 10:foods10061385. [PMID: 34203981 PMCID: PMC8232597 DOI: 10.3390/foods10061385] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Accepted: 06/02/2021] [Indexed: 01/25/2023] Open
Abstract
The nutritional characteristics of fatty acid (FA) containing foods are strongly dependent on the FA’s chemical/morphological arrangements. Paradoxically the nutritional, health enhancing FA polyunsaturated fatty acids (PUFAs) are highly susceptible to oxidation into harmful toxic side products during food preparation and storage. Current analytical technologies are not effective in the facile characterization of both the morphological and chemical structures of PUFA domains within materials for monitoring the parameters affecting their oxidation and antioxidant efficacy. The present paper is a review of our work on the development and application of a proton low field NMR relaxation sensor (1H LF NMR) and signal to time domain (TD) spectra reconstruction for chemical and morphological characterization of PUFA-rich oils and their oil in water emulsions, for assessing their degree and susceptibility to oxidation and the efficacy of antioxidants. The NMR signals are energy relaxation signals generated by spin–lattice interactions (T1) and spin–spin interactions (T2). These signals are reconstructed into 1D (T1 or T2) and 2D graphics (T1 vs. T2) by an optimal primal-dual interior method using a convex objectives (PDCO) solver. This is a direct measurement on non-modified samples where the individual graph peaks correlate to structural domains within the bulk oil or its emulsions. The emulsions of this review include relatively complex PUFA-rich oleosome-oil bodies based on the aqueous extraction from linseed seeds with and without encapsulation of externally added oils such as fish oil. Potential applications are shown in identifying optimal health enhancing PUFA-rich food formulations with maximal stability against oxidation and the potential for on-line quality control during preparation and storage.
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Nakauchi H, Maeda M, Kanayama N. Terminal Sequence-Specific Interparticle Attraction between DNA Duplex-Carrying Polystyrene Microparticles in Aqueous Salt Solution Assessed by Optical Tweezers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:5573-5581. [PMID: 33871256 DOI: 10.1021/acs.langmuir.1c00349] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The dispersion behavior of DNA duplex-carrying colloidal particles in aqueous high-salt solutions shows extraordinary selectivity against the duplex terminal sequence. We investigated the interparticle force between DNA duplex-carrying polystyrene (dsDNA-PS) microparticles in aqueous salt solutions and examined their behavior in relation to the duplex terminal sequences. Force-distance (F-D) curves for a pair of dsDNA-PS particles were recorded with a dual-beam optical tweezers system with the two optically trapped particles closely approaching each other. Interestingly, only 3-5% of the oligo-DNA strands on the dsDNA-PS particles formed a duplex with complementary DNAs, and the F-D curves showed a distinct specificity to the duplex terminal sequences in the interparticle force at a high-NaCl concentration; a clear attraction peak was observed in F-D curves only when the duplex terminal was a complementary base pair. The attractive strength reached 2.6 ± 0.5 pN at 500 mM NaCl and 4.3 ± 1.0 pN at 750 mM NaCl. By sharp contrast, no significant attraction occurred for the particles with mismatched duplex terminals even at 750 mM NaCl. Similar duplex terminal-specificity in the interparticle force was also confirmed for dsDNA-PS particles in divalent MgCl2 solutions. Considering that the duplex terminal sequences on the dsDNA-PS particles showed only a negligible difference in their surface charges under identical salt conditions, we concluded that the interparticle attraction observed only for the dsDNA-PS particles with complementary duplex terminals is attributable to the salt-facilitated stacking interaction between the paired terminal nucleobases (i.e., blunt-end stacking) on the dsDNA-PS surfaces. Our results thus demonstrate the occurrence of a duplex terminal-specific interparticle force between dsDNA-PS particles under high-salt conditions.
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Affiliation(s)
- Hiroya Nakauchi
- Department of Biomedical Engineering, Graduate School of Medicine, Science and Technology, Shinshu University, 4-17-1 Wakasato, Nagano-shi, Nagano 380-8553, Japan
| | - Mizuo Maeda
- Department of Biomedical Engineering, Graduate School of Medicine, Science and Technology, Shinshu University, 4-17-1 Wakasato, Nagano-shi, Nagano 380-8553, Japan
- Bioengineering Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Naoki Kanayama
- Department of Biomedical Engineering, Graduate School of Medicine, Science and Technology, Shinshu University, 4-17-1 Wakasato, Nagano-shi, Nagano 380-8553, Japan
- Bioengineering Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Institute of Biomedical Science, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan
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Aarøen O, Riccardi E, Sletmoen M. Exploring the effects of approach velocity on depletion force and coalescence in oil-in-water emulsions. RSC Adv 2021; 11:8730-8740. [PMID: 35423378 PMCID: PMC8695179 DOI: 10.1039/d1ra00661d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Accepted: 02/18/2021] [Indexed: 11/21/2022] Open
Abstract
An emulsion is a thermodynamically unstable system consisting of at least two immiscible liquid phases, one of which is dispersed in the other in the form of droplets of varying size. Most studies on emulsions have focused on the behaviour of emulsion droplets with diameter from ∼50 μm and upwards. However, the properties of smaller droplets may be highly relevant in order to understand the behaviour of emulsions, including their performance in numerous applications within the fields of food, industry, and medical science. The relatively long life-time and small size of these droplets compared to other emulsion droplets, make them suited for optical trapping and micromanipulation technologies. Optical tweezers have previously shown potential in the study of stabilized emulsions. Here we employ optical tweezers to examine unstable oil-in-water emulsions to determine the effects of system parameters on depletion force and coalescence times.
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Affiliation(s)
- Ola Aarøen
- Department of Biotechnology and Food Science, Norwegian University of Science and Technology Høgskoleringen 5 7491 Trondheim Norway
| | - Enrico Riccardi
- Department of Chemistry, Norwegian University of Science and Technology Høgskoleringen 5 7491 Trondheim Norway
- Department of Informatics, UiO Gaustadalléen 23B 0373 Oslo Norway
| | - Marit Sletmoen
- Department of Biotechnology and Food Science, Norwegian University of Science and Technology Høgskoleringen 5 7491 Trondheim Norway
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Chen A, Liu X, Wu Y, Luo G, Xu JH. Interactions between CO 2-Responsive Switchable Emulsion Droplets Determined by Using Optical Tweezers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:4600-4606. [PMID: 32299211 DOI: 10.1021/acs.langmuir.0c00203] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
CO2-responsive switchable emulsions have been of great interest in some industrial processes where the stability of the emulsion is only required temporarily, such as oil transport, drug delivery, and fossil fuel production. The good understanding of the stability and instability mechanism is vital to the switchable behavior between emulsification and demulsification. Herein, a novel approach was developed to determine the interactions between two switchable emulsion droplets directly by a dual-laser optical tweezers instrument. The repulsive force between a couple of tetradecane droplets occurs to increase progressively with the increasing concentration of switchable surfactant in solutions. However, the repulsive force appears to decrease progressively in turn when the switchable surfactant concentration is far higher than the critical micelle concentration (CMC). Moreover, the depletion effect starts to emerge in the higher surfactant concentration which is attributed to the switchable surfactant micelles generated in solutions. In addition, according to the measurements of interaction forces, a mechanism of the switchable behavior is well proposed, which is established by the principle of self-assembly/detachment of the switchable surfactant, resulting in the weakening and re-enhancing of the electrostatic double-layer (EDL) repulsive forces between tetradecane droplets, upon selective introduction and removal of CO2. Based on this work, a novel perspective was provided to study the switchable emulsion, which can contribute instructive messages for the understanding of stability and instability mechanisms of switchable emulsions.
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Affiliation(s)
- An Chen
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Xueyan Liu
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Yuxin Wu
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Guangsheng Luo
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Jian-Hong Xu
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
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10
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Chen A, Li S, Xu J. A novel approach to study the interactions between polymeric stabilized micron-sized oil droplets by optical tweezers. Chin J Chem Eng 2020. [DOI: 10.1016/j.cjche.2019.12.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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11
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Chen A, Li SW, Jing D, Xu JH. Interactions between colliding oil drops coated with non-ionic surfactant determined using optical tweezers. Chem Eng Sci 2019. [DOI: 10.1016/j.ces.2018.09.029] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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12
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Chen A, Jing Y, Sang FN, Li SW, Xu JH. Determination of the interaction mechanism of 10 µm oil-in-water emulsion droplets using optical tweezers. Chem Eng Sci 2018. [DOI: 10.1016/j.ces.2018.03.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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13
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Helgeson ME. Colloidal behavior of nanoemulsions: Interactions, structure, and rheology. Curr Opin Colloid Interface Sci 2016. [DOI: 10.1016/j.cocis.2016.06.006] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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14
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Griffiths MR, Raudsepp A, McGrath KM, Williams MAK. Measuring the interaction between a pair of emulsion droplets using dual-trap optical tweezers. RSC Adv 2016. [DOI: 10.1039/c5ra25073k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Force–separation curves measured from a singe pair of emulsion droplets as a function of salt concentration (fits are DLVO theory).
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Affiliation(s)
- Marjorie R. Griffiths
- School of Chemical and Physical Sciences
- Victoria University of Wellington
- New Zealand
- Riddet Institute
- Massey University
| | - Allan Raudsepp
- Institute of Fundamental Sciences
- Massey University
- Palmerston North
- New Zealand
| | - Kathryn M. McGrath
- School of Chemical and Physical Sciences
- Victoria University of Wellington
- New Zealand
- Riddet Institute
- Massey University
| | - Martin A. K. Williams
- Riddet Institute
- Massey University
- Palmerston North
- New Zealand
- Institute of Fundamental Sciences
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Shin K, Kim JW, Park H, Choi HS, Chae PS, Nam YS, Kim JW. Fabrication and stabilization of nanoscale emulsions by formation of a thin polymer membrane at the oil–water interface. RSC Adv 2015. [DOI: 10.1039/c5ra03872c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Extremely stable O/W nanoemulsions are fabricated by effective assembly of an amphiphilic PEO-b-PCL copolymer at the oil–water interface during phase inversion, which favors formation of a thin PEO-b-PCL film at the interface.
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Affiliation(s)
- Kyounghee Shin
- Department of Bionano Technology
- Hanyang University
- Ansan
- Republic of Korea
- R&D Center
| | - Jeong Won Kim
- Department of Bionano Technology
- Hanyang University
- Ansan
- Republic of Korea
| | - Hanhee Park
- Department of Applied Chemistry
- Hanyang University
- Ansan
- Republic of Korea
| | | | - Pil Seok Chae
- Department of Bionano Technology
- Hanyang University
- Ansan
- Republic of Korea
| | - Yoon Sung Nam
- Department of Materials Science and Engineering
- Korea Advanced Institute of Science and Technology
- Daejeon
- Republic of Korea
| | - Jin Woong Kim
- Department of Bionano Technology
- Hanyang University
- Ansan
- Republic of Korea
- Department of Applied Chemistry
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