1
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Neofytos DD, Gregersen SB, Andersen U, Corredig M. In situ single-droplet analysis of emulsified fat using confocal Raman microscopy: insights into crystal network formation within spatial resolution. SOFT MATTER 2024. [PMID: 38690673 DOI: 10.1039/d4sm00194j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
Fat crystallization is one of the predominant factors influencing the structure and properties of fat-containing emulsions. In the present study, the role of emulsifiers on fat crystallization dynamics within droplet multiphase systems was evaluated via single-droplet analysis, taking advantage of the non-destructive properties of confocal Raman microscopy. Palm oil droplets dispersed in water were used as a model system, due to palm oil's well-known crystallization properties. Emulsion droplets of the same size were generated using two different emulsifiers (Whey Protein Isolate and Tween 60), at various concentrations. Fast and slow cooling treatments were applied to affect fat crystallisation and network formation as well as droplet morphology, and crystallization dynamics. Raman imaging analysis demonstrated that the chemical structure and concentration of the emulsifier significantly influenced both crystal nucleation within the droplets, as well as the spatial distribution and morphology of the fat crystal network. Additionally, analysis of the spectra of the crystallized phase provided essential information regarding the impact of the emulsifiers on the microstructure, degree of structural order, and structural arrangements of the fat crystal networks. Furthermore, by performing single droplet analysis during cooling it was possible to observe shape distortions in Tween 60 stabilized droplets, as a consequence of the formation of a three-dimensional network of fat crystals that strongly interacted with the interface. On the other hand, the droplets retained their shape when whey proteins were absorbed at the interface. Confocal Raman microscopy, in combination with polarized light microscopy, is, therefore, a well-suited tool for in situ, single-droplet analysis of emulsified oil systems, providing essential information about emulsified fat crystallization dynamics, contributing to better understanding and designing products with enhanced structure and function.
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Affiliation(s)
- Dionysios D Neofytos
- Department of Food Science, Aarhus University, Agro Food Park 48, 8200 Aarhus, Denmark.
| | | | - Ulf Andersen
- Arla Innovation Centre, Arla Foods, Agro Food Park 19, 8200 Aarhus, Denmark
| | - Milena Corredig
- Department of Food Science, Aarhus University, Agro Food Park 48, 8200 Aarhus, Denmark.
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2
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MacWilliams SV, Clulow AJ, Gillies G, Beattie DA, Krasowska M. Recent advances in studying crystallisation of mono- and di-glycerides at oil-water interfaces. Adv Colloid Interface Sci 2024; 326:103138. [PMID: 38522289 DOI: 10.1016/j.cis.2024.103138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2024] [Revised: 03/19/2024] [Accepted: 03/20/2024] [Indexed: 03/26/2024]
Abstract
This review focuses on the current understanding regarding lipid crystallisation at oil-water interfaces. The main aspects of crystallisation in bulk lipids will be introduced, allowing for a more comprehensive overview of the crystallisation processes within emulsions. Additionally, the properties of an emulsion and the impact of lipid crystallisation on emulsion stability will be discussed. The effect of different emulsifiers on lipid crystallisation at oil-water interfaces will also be reviewed, however, this will be limited to their impact on the interfacial crystallisation of monoglycerides and diglycerides. The final part of the review highlights the recent methodologies used to study crystallisation at oil-water interfaces.
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Affiliation(s)
- Stephanie V MacWilliams
- Future Industries Institute, UniSA STEM, University of South Australia, Mawson Lakes Campus, Mawson Lakes, SA 5095, Australia.
| | - Andrew J Clulow
- Australian Synchrotron, ANSTO, 800 Blackburn Road, Clayton, VIC 3168, Australia
| | - Graeme Gillies
- Fonterra Research and Development Centre, Dairy Farm Road, Fitzherbert, Palmerston North 4442, New Zealand
| | - David A Beattie
- Future Industries Institute, UniSA STEM, University of South Australia, Mawson Lakes Campus, Mawson Lakes, SA 5095, Australia
| | - Marta Krasowska
- Future Industries Institute, UniSA STEM, University of South Australia, Mawson Lakes Campus, Mawson Lakes, SA 5095, Australia.
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3
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Zeng C, Wang Y, Liu Y, Su S, Lu Y, Qin S, Shi M. Self-constructed water-in-oil Pickering emulsions as a tool for increasing bioaccessibility of betulin. Food Chem X 2024; 21:101056. [PMID: 38187946 PMCID: PMC10770430 DOI: 10.1016/j.fochx.2023.101056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Revised: 12/05/2023] [Accepted: 12/05/2023] [Indexed: 01/09/2024] Open
Abstract
Self-constructed water-in-oil emulsions can be stabilized by a natural pentacyclic triterpenoid, betulin. A higher betulin concentration (3%) results in smaller emulsion droplet sizes. Microscopy, confocal laser scanning microscopy and rheology indicate that the stabilizing mechanism is attributed to betulin crystals on the emulsion interface and within the continuous phase, thereby enabling excellent freeze/thaw and thermal stability. The betulin Pickering emulsion (1%) significantly increased betulin bioaccessibility (22.4%) compared to betulin alone (0.2%) and betulin-oil physical mixture (7.9%). A higher level of betulin at 3% leads to smaller emulsion particle size, potentially resulting in a greater surface area. This, in return, promotes a higher release of free fatty acids (FFA), contributing to the release and solubilization of betulin from emulsions. Additionally, it leads to the formation of micelles, further increasing betulin bioaccessibility (29.3%). This study demonstrates Pickering emulsions solely stabilized by phytochemical betulin provides an innovative way to improve its bioaccessibility.
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Affiliation(s)
- Chaoxi Zeng
- Lab of Food Function and Nutrigenomics, College of Food Science and Technology, Hunan Agricultural University, Changsha 410128, China
| | - Yuxian Wang
- Lab of Food Function and Nutrigenomics, College of Food Science and Technology, Hunan Agricultural University, Changsha 410128, China
| | - Yugang Liu
- Lab of Food Function and Nutrigenomics, College of Food Science and Technology, Hunan Agricultural University, Changsha 410128, China
| | - Shuxian Su
- Lab of Food Function and Nutrigenomics, College of Food Science and Technology, Hunan Agricultural University, Changsha 410128, China
| | - Yuting Lu
- Lab of Food Function and Nutrigenomics, College of Food Science and Technology, Hunan Agricultural University, Changsha 410128, China
| | - Si Qin
- Lab of Food Function and Nutrigenomics, College of Food Science and Technology, Hunan Agricultural University, Changsha 410128, China
| | - Meng Shi
- Lab of Food Function and Nutrigenomics, College of Food Science and Technology, Hunan Agricultural University, Changsha 410128, China
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4
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Cholakova D, Denkov N. Polymorphic phase transitions in triglycerides and their mixtures studied by SAXS/WAXS techniques: In bulk and in emulsions. Adv Colloid Interface Sci 2024; 323:103071. [PMID: 38157769 DOI: 10.1016/j.cis.2023.103071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 12/04/2023] [Accepted: 12/11/2023] [Indexed: 01/03/2024]
Abstract
Triacylglycerols (TAGs) exhibit a monotropic polymorphism, forming three main polymorphic forms upon crystallization: α, β' and β. The distinct physicochemical properties of these polymorphs, such as melting temperature, subcell lattice structure, mass density, etc., significantly impact the appearance, texture, and long-term stability of a wide range products in the food and cosmetics industries. Additionally, TAGs are also of special interest in the field of controlled drug delivery and sustained release in pharmaceuticals, being a key material in the preparation of solid lipid nanoparticles. The present article outlines our current understanding of TAG phase behavior in both bulk and emulsified systems. While our primary focus are investigations involving monoacid TAGs and their mixtures, we also include illustrative examples with natural TAG oils, highlighting the knowledge transfer from simple to intricate systems. Special attention is given to recent discoveries via X-ray scattering techniques. The main factors influencing TAG polymorphism are discussed, revealing that a higher occurrence of structural defects in the TAG structure always accelerates the rate of the α → β polymorphic transformation. Diverse approaches can be employed based on the specific system: incorporating foreign molecules or solid particles into bulk TAGs, reducing drop size in dispersed systems, or using surfactants that remain fluid during TAG particle crystallization, ensuring the necessary molecular mobility for the polymorphic transformation. Furthermore, we showcase the role of TAG polymorphism on a recently discovered phenomenon: the creation of nanoparticles as small as 20 nm from initial coarse emulsions without any mechanical energy input. This analysis underscores how the broader understanding of the TAG polymorphism can be effectively applied to comprehend and control previously unexplored processes of notable practical importance.
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Affiliation(s)
- Diana Cholakova
- Department of Chemical and Pharmaceutical Engineering, Faculty of Chemistry and Pharmacy, Sofia University, 1 James Bourchier Avenue, 1164 Sofia, Bulgaria.
| | - Nikolai Denkov
- Department of Chemical and Pharmaceutical Engineering, Faculty of Chemistry and Pharmacy, Sofia University, 1 James Bourchier Avenue, 1164 Sofia, Bulgaria
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5
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Saadi S, Ariffin AA, Ghazali HM, Saari N, Mohammed AS, Anwar F, Hamid AA, Nacer NE. Structure–energy relationship of food materials using differential scanning calorimetry. J FOOD PROCESS ENG 2023. [DOI: 10.1111/jfpe.14336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
Affiliation(s)
- Sami Saadi
- Institute de la Nutrition, de l'Alimentation et des Technologies Agroalimetaires INATAA Université des Frères Mentouri Constantine 1 Route de Ain El Bey Constantine Algeria
- Laboratoire de Génie Agro‐Alimentaire (GeniAAl), INATAA Université Frères Mentouri Constantine 1 UFC1 Route de Ain El Bey Constantine Algeria
| | - Abdul Azis Ariffin
- Faculty of Food Science and Technology University Putra Malaysia 43400 Serdang Selangor Malaysia
| | - Hasanah Mohd Ghazali
- Faculty of Food Science and Technology University Putra Malaysia 43400 Serdang Selangor Malaysia
| | - Nazamid Saari
- Faculty of Food Science and Technology University Putra Malaysia 43400 Serdang Selangor Malaysia
| | | | - Farooq Anwar
- Department of Food Science, Faculty of Food Science and Technology Universiti Putra Malaysia 43400 Serdang Selangor Malaysia
- Institute of Chemistry University of Sargodha Sargodha 40100 Pakistan
| | - Azizah Abdul Hamid
- Faculty of Food Science and Technology University Putra Malaysia 43400 Serdang Selangor Malaysia
| | - Nor Elhouda Nacer
- Department of Biology of Organisms, Faculty of Natural and Life Sciences University of Batna 2 Batna 05000 Algeria
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6
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Asyrul-Izhar AB, Bakar J, Sazili AQ, Goh YM, Ismail-Fitry MR. Emulsion Gels Formed by Electrostatic Interaction of Gelatine and Modified Corn Starch via pH Adjustments: Potential Fat Replacers in Meat Products. Gels 2023; 9:gels9010050. [PMID: 36661816 PMCID: PMC9857752 DOI: 10.3390/gels9010050] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 12/20/2022] [Accepted: 12/30/2022] [Indexed: 01/11/2023] Open
Abstract
The application of emulsion gels as animal fat replacers in meat products has been focused on due to their unique physicochemical properties. The electrostatic interaction between proteins and polysaccharides could influence emulsion gel stability. This study aimed to evaluate the physicochemical properties of emulsion gels using starch and gelatin as stabilizers, promoting electrostatic attraction via pH adjustment. Three systems were studied: emulsion gel A (EGA) and emulsion gel B (EGB), which have positive and negative net charges that promote electrostatic interaction, and emulsion gel C (EGC), whose charge equals the isoelectric point and does not promote electrostatic interactions. There was no significant difference in proximate analysis, syneresis and thermal stability between samples, while EGA and EGB had higher pH values than EGC. The lightness (L*) value was higher in EGA and EGB, while the yellowness (b*) value was the highest in EGC. The smaller particle size (p < 0.05) in EGA and EGB also resulted in higher gel strength, hardness and oxidative stability. Microscopic images showed that EGA and EGB had a more uniform matrix structure. X-ray diffraction demonstrated that all the emulsion gels crystallized in a β′ polymorph form. Differential scanning calorimetry (DSC) revealed a single characteristic peak was detected in both the melting and cooling curves for all the emulsion gels, which indicated that the fat exists in a single polymorphic state. All emulsion gels presented a high amount of unsaturated fatty acids and reduced saturated fat by up to 11%. Therefore, the emulsion gels (EGA and EGB) that favored the electrostatic protein-polysaccharide interactions are suitable to be used as fat replacers in meat products.
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Affiliation(s)
- Abu Bakar Asyrul-Izhar
- Department of Food Technology, Faculty of Food Science and Technology, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia
| | - Jamilah Bakar
- Department of Food Technology, Faculty of Food Science and Technology, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia
| | - Awis Qurni Sazili
- Department of Animal Science, Faculty of Agriculture, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia
- Halal Products Research Institute, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia
| | - Yong Meng Goh
- Department of Veterinary Preclinical Sciences, Faculty of Veterinary Medicine, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia
| | - Mohammad Rashedi Ismail-Fitry
- Department of Food Technology, Faculty of Food Science and Technology, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia
- Halal Products Research Institute, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia
- Correspondence:
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7
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MacWilliams SV, Clulow AJ, Kirby NM, Miller R, Boyd BJ, Gillies G, Beattie DA, Krasowska M. Isolating the interface of an emulsion using X-ray scattering and tensiometry to understand protein-modulated alkylglyceride crystallisation. J Colloid Interface Sci 2023; 630:202-214. [DOI: 10.1016/j.jcis.2022.10.069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Revised: 09/25/2022] [Accepted: 10/15/2022] [Indexed: 11/06/2022]
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8
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Gao Y, Mao J, Meng Z. Tracing distribution and interface behavior of water droplets in W/O emulsions with fat crystals. Food Res Int 2023; 163:112215. [PMID: 36596144 DOI: 10.1016/j.foodres.2022.112215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Revised: 10/12/2022] [Accepted: 11/19/2022] [Indexed: 11/25/2022]
Abstract
Sucrose palmitate (P170) and sucrose laurate (L195) were used as emulsifiers to control the crystallization behavior of AMF and to stabilize W/O emulsions. In this study, the P170 promoted crystallization and led to strong fat crystal networks with smaller AMF crystals (60-80 μm) in emulsions, retaining flocculation. Water droplets were squeezed into irregular shapes between the strong network but the P170 formed an interface layer with better strength to resist the aggregation. Contrarily, the L195 inhibited crystallization and formed larger AMF spherulites (more than 100 μm) resulting in a low strength of fat crystal networks and unstable emulsions. Meanwhile, the water droplets were easily fixed on the surface of AMF crystals because of the existence of sucrose esters. Protruding crystals on the surface of larger spherulites could pierce the water-oil interface, leading to a greater coalescence and forming larger water droplets. Therefore, a weak crystal network could not prevent the sedimentation and phase separation caused by gravity.
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Affiliation(s)
- Yujie Gao
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, 1800 Lihu Road, Wuxi 214122, Jiangsu, People's Republic of China
| | - Jixian Mao
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, 1800 Lihu Road, Wuxi 214122, Jiangsu, People's Republic of China
| | - Zong Meng
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, 1800 Lihu Road, Wuxi 214122, Jiangsu, People's Republic of China.
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9
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Effect of W/O pre-emulsion prepared with different emulsifiers on the physicochemical properties of soy protein isolate-based emulsion films. Food Hydrocoll 2022. [DOI: 10.1016/j.foodhyd.2022.108440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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10
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Gao Y, Meng Z. Crystallization of lipids and lipid emulsions treated by power ultrasound: A review. Crit Rev Food Sci Nutr 2022; 64:1882-1893. [PMID: 36073738 DOI: 10.1080/10408398.2022.2119365] [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] [Indexed: 11/03/2022]
Abstract
The actual food system with fat is always complex and fat crystal and fat crystal networks have important effects on the physical properties of food. Recently, power ultrasound (PU) had been widely recognized as an auxiliary technology of fat crystallization to modify food properties. This review expounded on the mechanism of ultrasonic crystallization, and summarized effects of various factors in the process of ultrasonic treatment on fat crystallization. Based on the above, combined with the application of ultrasound in emulsions, the ultrasonic fat crystallization effect in the emulsion system was judged and described. Research results indicated that PU could shorten the induction time of crystallization, accelerate the formation of crystal nuclei, and change the polymorphism of fat crystals. The product treated by PU formed smaller and more uniform crystals to produce a more viscoelastic fat crystal network. In emulsion systems, ultrasonic treatments showed the same effect, but the effect of ultrasonic crystallization on the emulsion stability was different due to fat crystals in different emulsion systems. Meanwhile, the importance of ultrasonic crystallization in lipid emulsions was emphasized, thus ultrasonic crystallization had great potential in emulsion systems.
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Affiliation(s)
- Yujie Gao
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, People's Republic of China
| | - Zong Meng
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, People's Republic of China
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11
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Bharti D, Kim D, Banerjee I, Rousseau D, Pal K. Effects of Sorbitan Monostearate and Stearyl Alcohol on the Physicochemical Parameters of Sunflower-Wax-Based Oleogels. Gels 2022; 8:gels8080520. [PMID: 36005121 PMCID: PMC9407308 DOI: 10.3390/gels8080520] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Revised: 08/04/2022] [Accepted: 08/17/2022] [Indexed: 11/21/2022] Open
Abstract
A rising health concern with saturated fatty acids allowed researchers to look into the science of replacing these fats with unsaturated fatty acids. Oleogelation is a technique to structure edible oil using gelators. The present study looked for the effect of solid emulsifiers; namely, sorbitan monostearate (SP) and stearyl alcohol (SA), on the physicochemical parameters of oleogels. All the oleogels were formulated using 5% sunflower wax (SW) in sunflower oil (SO). The formulated oleogels displayed irregular-shaped wax crystals on their surface. The bright-field and polarized microscopy showed the fiber/needle network of wax crystals. Formulations consisting of 10 mg (0.05% w/w) of both the emulsifiers (SA10 and SP10) in 20 g of oleogels displayed the appearance of a dense wax crystal network. The SP and SA underwent co-crystallization with wax molecules, which enhanced crystal growth and increased the density and size of the wax crystals. The XRD and FTIR studies suggested the presence of a similar β’ polymorph to that of the triacylglycerols’ arrangement. The incorporation of SA and SP in wax crystal packing might have resulted in a lower crystallization rate in SA10 and SP10. Evaluation of the thermal properties of oleogels through DSC showed better gel recurrence of high melting enthalpy. These formulations also displayed a sustained release of curcumin. Despite the variations in several properties (e.g., microstructures, crystallite size, thermal properties, and nutrient release), the emulsifiers did not affect the mechanical properties of the oleogel. The meager amounts of both the emulsifiers were able to modulate the nutrient release from the oleogels without affecting their mechanical properties in comparison to the control sample.
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Affiliation(s)
- Deepti Bharti
- Department of Biotechnology and Medical Engineering, National Institute of Technology Rourkela, Rourkela 769008, India
| | - Doman Kim
- Department of International Agricultural Technology & Institute of Green BioScience and Technology, Seoul National University, Seoul 24266, Korea
| | - Indranil Banerjee
- Department of Bioscience & Bioengineering, IIT Jodhpur, Jodhpur 342037, India
| | - Derick Rousseau
- Department of Chemistry and Biology, Ryerson University, Toronto, ON M5B 2K3, Canada
| | - Kunal Pal
- Department of Biotechnology and Medical Engineering, National Institute of Technology Rourkela, Rourkela 769008, India
- Correspondence:
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12
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Saffold AC, Acevedo NC. The effect of mono‐diglycerides on the mechanical properties, microstructure, and physical stability of an edible rice bran wax–gelatin biphasic gel system. J AM OIL CHEM SOC 2022. [DOI: 10.1002/aocs.12640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ariana C. Saffold
- Department of Food Science and Human Nutrition Iowa State University Ames Iowa USA
| | - Nuria C. Acevedo
- Department of Food Science and Human Nutrition Iowa State University Ames Iowa USA
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13
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Li W, Chen Z, Wang W, Lan Y, Huang Q, Cao Y, Xiao J. Modulation of the spatial distribution of crystallizable emulsifiers in Pickering double emulsions. J Colloid Interface Sci 2022; 619:28-41. [DOI: 10.1016/j.jcis.2022.03.118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 02/13/2022] [Accepted: 03/25/2022] [Indexed: 11/29/2022]
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14
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Li W, Wang W, Yong C, Lan Y, Huang Q, Xiao J. Effects of the Distribution Site of Crystallizable Emulsifiers on the Gastrointestinal Digestion Behavior of Double Emulsions. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2022; 70:5115-5125. [PMID: 35438487 DOI: 10.1021/acs.jafc.1c07987] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Double emulsions (DEs) are promising delivery vehicles for the protective and programmed release of bioactive compounds. Herein, DEs with monoglycerides crystallized at the internal- or external interface or oil phase were fabricated. The results suggested that the crystallization site of monoglycerides exerts a significant role in retarding the structural degradation and lipid digestion of DEs by affecting the available contact area of lipase. At the initial stage of intestinal digestion, compared with noncrystalline DEs (82.1%, 3.7 min), the burst release of internal markers in the internal interface crystallized emulsions was decreased by 42.4% and the lag time of free fatty acid (FFA) release was delayed by 5.8 min in the external interface crystallized emulsions. The structural integrity and digestion kinetics of the external interface crystallized DEs were synchronized with the retention time of the interfacial crystals. Therefore, crystallizable emulsifiers exhibit unique and fine regulatory effects on the digestive properties of emulsions.
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Affiliation(s)
- Wantong Li
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Guangzhou, Guangdong 510642, China
| | - Wenbo Wang
- College of Electronic Engineering, South China Agricultural University, Guangzhou, Guangdong 510642, China
| | - Cao Yong
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Guangzhou, Guangdong 510642, China
| | - Yaqi Lan
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Guangzhou, Guangdong 510642, China
| | - Qingrong Huang
- Department of Food Science, Rutgers The State University of New Jersey, 65 Dudley Road, New Brunswick, New Jersey 08901, United States
| | - Jie Xiao
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Guangzhou, Guangdong 510642, China
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15
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Zeng D, Cai Y, Liu T, Huang L, Zeng Y, Zhao Q, Zhao M. The effect of sucrose esters S1570 on partial coalescence and whipping properties. Food Hydrocoll 2022. [DOI: 10.1016/j.foodhyd.2021.107429] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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16
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Lipopeptides in promoting signals at surface/interface of micelles: Their roles in repairing cellular and nuclear damages. FOOD BIOSCI 2022. [DOI: 10.1016/j.fbio.2021.101522] [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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17
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The effect of emulsifier type on the secondary crystallisation of monoacylglycerol and triacylglycerols in model dairy emulsions. J Colloid Interface Sci 2022; 608:2839-2848. [PMID: 34801239 DOI: 10.1016/j.jcis.2021.11.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Revised: 11/01/2021] [Accepted: 11/02/2021] [Indexed: 11/21/2022]
Abstract
Dairy emulsions contain an intrinsically heterogeneous lipid phase, whose components undergo crystallisation in a manner that is critical to dairy product formulation, storage, and sensory perception. Further complexity is engendered by the diverse array of interfacially-active molecules naturally present within the serum of dairy systems, and those that are added for specific formulation purposes, all of which interact at the lipid-serum interface and modify the impact of lipid crystals on dairy emulsion stability. The work described in this article addresses this complexity, with a specific focus on the impact of temperature cycling and the effect of emulsifier type on the formation and persistence of lipid crystals at lipid-solution interfaces. Profile analysis tensiometry experiments were performed using single droplets of the low melting fraction of dairy lipids, in the presence and absence of emulsifiers (Tween 80 and whey protein isolate, WPI) and during the temperature cycling, to study the formation of monoacylglycerol (MAG) crystals at the lipid-solution interface. Companion experiments on the same lipid systems, and at the same cooling and heating rates, were undertaken with synchrotron small angle X-ray scattering, to specifically analyse the effect of emulsifier type on the formation of triacylglycerol (TAG) crystals at the lipid-solution interface of a model dairy emulsion. These two complementary techniques have revealed that Tween 80 molecules delay MAG and TAG crystal formation by lowering the temperature at which the crystallisation occurs during two cooling cycles. WPI molecules delay the crystallisation of MAGs and TAGs during the first cooling cycle, while MAG crystals form without delay during the second cooling cycle at the same temperature as MAG crystals in an emulsifier free system. The crystallisation of TAGs is inhibited during the second cooling cycle. The observed differences in crystallisation behaviour at the interface upon temperature cycling can provide further insight into the impact of emulsifiers on the long-term stability of emulsion-based dairy systems during storage.
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18
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Liu C, Zheng Z, Liu Y. Effects of natural waxes on the interfacial behavior, structural properties and foam stabilization of aerated emulsions. Food Funct 2022; 13:8860-8870. [DOI: 10.1039/d2fo01670b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Aerated emulsions have widespread applications in food industry. However, the poor stability of aerated emulsions remains a major challenge due to their inherent thermodynamic instability. Herein, a novel strategy to...
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19
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Li G, Lee WJ, Liu N, Lu X, Tan CP, Lai OM, Qiu C, Wang Y. Stabilization mechanism of water-in-oil emulsions by medium- and long-chain diacylglycerol: Post-crystallization vs. pre-crystallization. Lebensm Wiss Technol 2021. [DOI: 10.1016/j.lwt.2021.111649] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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20
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Silva TJ, Barrera-Arellano D, Ribeiro APB. Oleogel-based emulsions: Concepts, structuring agents, and applications in food. J Food Sci 2021; 86:2785-2801. [PMID: 34160057 DOI: 10.1111/1750-3841.15788] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 03/23/2021] [Accepted: 05/02/2021] [Indexed: 01/03/2023]
Abstract
This review discusses the application of oleogel technology in emulsified systems. In these systems of mimetic fats, water-in-oil or oil-in-water emulsions can be obtained, but, here, we cover emulsions with an oil continuous phase in detail. Depending on the percentage of water added to the oleogels, systems with different textures and rheological properties can be developed. These properties are affected by the characteristics and concentration of the added components and emulsion preparation methods. In addition, some gelators exhibit interfacial properties, resulting in more stable emulsions than those of conventional emulsions. Oleogel-based emulsion are differentiated by continuous and dispersed phases and the structuring/emulsification components. Crucially, these emulsions could be applied by the food industry for preparing, for example, meat products and margarines, as well as by the cosmetics industry. We present the different processes of emulsion elaboration, the main gelators used, the influence of the water content on the structuring of water-in-oleogel emulsions, and the structuring mechanisms (Pickering, network, and combined Pickering and network stabilization). Finally, we highlight the applications of these systems as alternatives for reducing processed food lipid content and saturated fat levels.
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Affiliation(s)
- Thais J Silva
- Laboratory of Oils and Fats, Department of Food Technology, School of Food Engineering, University of Campinas, Campinas, São Paulo, Brazil
| | - Daniel Barrera-Arellano
- Laboratory of Oils and Fats, Department of Food Technology, School of Food Engineering, University of Campinas, Campinas, São Paulo, Brazil
| | - Ana Paula B Ribeiro
- Laboratory of Oils and Fats, Department of Food Technology, School of Food Engineering, University of Campinas, Campinas, São Paulo, Brazil
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21
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Panchal B, Truong T, Prakash S, Bansal N, Bhandari B. Influence of Emulsifiers and Dairy Ingredients on Manufacturing, Microstructure, and Physical Properties of Butter. Foods 2021; 10:1140. [PMID: 34065288 PMCID: PMC8160933 DOI: 10.3390/foods10051140] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 05/09/2021] [Accepted: 05/18/2021] [Indexed: 11/16/2022] Open
Abstract
The influence of emulsifiers and dairy solids on churning and physical attributes of butter was investigated. Commercial dairy cream was blended with each of the ingredients (0.5%, w/w) separately, aged overnight (10 °C), and churned (10 °C) into butter. The employed additives showed a distinctive impact on the macroscopic properties of butter without largely affecting the melting behavior. In fresh butter, polyglycerol polyricinoleate (PGPR) emulsifier having dominated hydrophobic moieties significantly (p < 0.05) enhanced the softness. Among dairy solids, sodium caseinate (SC) was the most effective in reducing the solid fat fraction, hardness, and elastic modulus (G'), while whey protein isolate (WPI) and whole milk powder (WMP) produced significantly harder, stiffer, and more adhesive butter texture. As per tribological analysis, PGPR, Tween 80, and SC lowered the friction-coefficient of butter, indicating an improved lubrication property of the microstructure. The extent of butter-setting during 28 days of storage (5 °C) varied among the samples, and in specific, appeared to be delayed in presence of WPI, WMP, and buttermilk solids. The findings of the study highlighted the potential of using applied emulsifiers and dairy-derived ingredients in modifying the physical functionality of butter and butter-like churned emulsions in addition to a conventional cream-ageing process.
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Affiliation(s)
- Bhavesh Panchal
- ARC Dairy Innovation Hub, School of Agriculture and Food Sciences, University of Queensland, Brisbane, QLD 4072, Australia; (B.P.); (S.P.); (N.B.)
| | - Tuyen Truong
- School of Science, RMIT University, Melbourne, VIC 3028, Australia;
| | - Sangeeta Prakash
- ARC Dairy Innovation Hub, School of Agriculture and Food Sciences, University of Queensland, Brisbane, QLD 4072, Australia; (B.P.); (S.P.); (N.B.)
| | - Nidhi Bansal
- ARC Dairy Innovation Hub, School of Agriculture and Food Sciences, University of Queensland, Brisbane, QLD 4072, Australia; (B.P.); (S.P.); (N.B.)
| | - Bhesh Bhandari
- ARC Dairy Innovation Hub, School of Agriculture and Food Sciences, University of Queensland, Brisbane, QLD 4072, Australia; (B.P.); (S.P.); (N.B.)
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22
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Cheng J, Kan Q, Cao J, Dudu OE, Yan T. Interfacial compositions of fat globules modulate coconut oil crystallization behavior and stability of whipped-frozen emulsions. Food Hydrocoll 2021. [DOI: 10.1016/j.foodhyd.2020.106580] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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23
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Wakui R, Kamigaki T, Nishino Y, Ito Y, Miyazawa A, Shiota M. Effect of Sucrose Esterified Fatty Acid Moieties on the Crystal Nanostructure and Physical Properties of Water-in-oil Palm-based Fat Blends. J Oleo Sci 2021; 70:479-490. [PMID: 33692235 DOI: 10.5650/jos.ess20210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The effects of sucrose ester of fatty acid (SEF) on the nanostructure and the physical properties of water-in-oil (W/O)-type emulsified semisolid fats were investigated. Model emulsions including palm-based semisolid fats and fully hydrogenated rapeseed oils with 0.5% SEF or fractionated lecithin, were prepared by rapidly cooling crystallization using 0.5% monoacylglycerol as an emulsifier. The SEFs used in this study were functionalized with various fatty acids, namely, lauric, palmitic, stearic, oleic, and erucic acids. Cryogenic transmission electron microscopy (cryo-TEM) was used to observe the sizes of the solvent- extracted nanoplatelets. The solid fat content (SFC), oil migration value, and storage elastic modulus were also determined. The average crystal size, which was measured in length, of the fat blends with SEFs containing saturated fatty acids (namely, palmitic and stearic acids) was smaller than that of the SEFs containing unsaturated fatty acids (namely, oleic and erucic acids). The effects exerted by these fatty acid moieties on the spherulite size in the corresponding bulk fat blends were observed via polarized microscopy (PLM). The results suggest that nanostructure formation upon the addition of SEF ultimately influenced these aggregated microstructures. Generally, smaller platelets resulted in higher SFC in the fat phase, and a high correlation between the SFC and the G' values in W/O emulsion fats was observed (R2 = 0.884) at 30°C. In contrast, the correlation was low at 10℃. Furthermore, samples with larger nanocrystals had a higher propensity for oil migration. Thus, the addition of SEF regulated the fat crystal nanostructure during nucleation and crystal growth, which could ultimately influence the physical properties of commercially manufactured fat products such as margarine.
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Affiliation(s)
- Ryota Wakui
- Milk Science Institute, Megmilk Snow Brand, Co., Ltd
| | | | - Yuri Nishino
- Graduate School of Life Science, University of Hyogo
| | - Yoshiko Ito
- Graduate School of Life Science, University of Hyogo
| | | | - Makoto Shiota
- Milk Science Institute, Megmilk Snow Brand, Co., Ltd
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24
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The effect of triacylglycerol and fatty acid composition on the rheological properties of butter. Int Dairy J 2021. [DOI: 10.1016/j.idairyj.2020.104913] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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25
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Al-Maqtari QA, Ghaleb ADS, Mahdi AA, Al-Ansi W, Noman AE, Wei M, Al-Adeeb A, Yao W. Stabilization of water-in-oil emulsion of Pulicaria jaubertii extract by ultrasonication: Fabrication, characterization, and storage stability. Food Chem 2021; 350:129249. [PMID: 33610840 DOI: 10.1016/j.foodchem.2021.129249] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 01/24/2021] [Accepted: 01/28/2021] [Indexed: 12/01/2022]
Abstract
This study investigated the effect of ultrasonic treatments on the properties and stability of the water-in-oil (W/O) emulsion of Pulicaria jaubertii (PJ) extract. The study used different ultrasound powers (0, 100, 200, 400, and 600 W) at two storage degrees (4 and 25 °C) for 28 days. The findings showed that the emulsifying properties were improved to different extents after ultrasonic treatments. The treatment at 600 W showed optimum particle size, polydispersity index, emulsifying property, viscosity properties, and release of total phenolic content than the other powers. However, the ultrasonic power of 400 W gave positive effects on creaming index and antioxidant release compared to 600 W. The emulsion stored at 4 °C presented higher stability than that stored at 25 °C during the 28 days of storage. Microscopically, the increase in sonication power up to 600 W reduced particle size and decreased flocculation, thus resulted in stable emulsions, which is desirable for its applications in food systems.
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Affiliation(s)
- Qais Ali Al-Maqtari
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi 214122, Jiangsu Province, China; International Joint Laboratory on Food Safety, Jiangnan University, 1800 Lihu Avenue, Wuxi 214122, Jiangsu Province, China; Department of Biology, Faculty of Science, Sana'a University, Sana'a, Yemen; Department of Food Science and Technology, Faculty of Agriculture, Sana'a University, Sana'a, Yemen
| | - Abduljalil D S Ghaleb
- Department of Food Science and Technology, Faculty of Agriculture, Sana'a University, Sana'a, Yemen; Faculty of Applied and Medical Science, Al-Razi University, Al-Rebatt St., Sana'a, Yemen
| | - Amer Ali Mahdi
- Department of Food Science and Technology, Faculty of Agriculture, Sana'a University, Sana'a, Yemen; School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Waleed Al-Ansi
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi 214122, Jiangsu Province, China; Department of Food Science and Technology, Faculty of Agriculture, Sana'a University, Sana'a, Yemen
| | - Abeer Essam Noman
- Department of Food Science and Technology, Faculty of Agriculture, Sana'a University, Sana'a, Yemen; College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Minping Wei
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi 214122, Jiangsu Province, China; International Joint Laboratory on Food Safety, Jiangnan University, 1800 Lihu Avenue, Wuxi 214122, Jiangsu Province, China
| | - Abdulqader Al-Adeeb
- Laboratory of Industrial Microbiology, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China
| | - Weirong Yao
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi 214122, Jiangsu Province, China; International Joint Laboratory on Food Safety, Jiangnan University, 1800 Lihu Avenue, Wuxi 214122, Jiangsu Province, China.
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26
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The stability of aerated emulsions: Effects of emulsifier synergy on partial coalescence and crystallization of milk fat. J FOOD ENG 2021. [DOI: 10.1016/j.jfoodeng.2020.110257] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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27
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Foams of vegetable oils containing long-chain triglycerides. J Colloid Interface Sci 2021; 583:522-534. [DOI: 10.1016/j.jcis.2020.09.043] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 09/11/2020] [Accepted: 09/12/2020] [Indexed: 01/09/2023]
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28
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Liu C, Zheng Z, Xi C, Liu Y. Exploration of the natural waxes-tuned crystallization behavior, droplet shape and rheology properties of O/W emulsions. J Colloid Interface Sci 2020; 587:417-428. [PMID: 33370663 DOI: 10.1016/j.jcis.2020.12.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 09/28/2020] [Accepted: 12/08/2020] [Indexed: 10/22/2022]
Abstract
Lipid crystallization in O/W emulsions is essential to control the release of nutrients and to food structuring. While few information is involved in adjusting and controlling the performance of emulsions by adjusting oil phase crystallization behavior. We herein developed a novel strategy for designing lipid crystallization inside oil droplets by natural waxes to modify the O/W emulsion properties. Natural waxes, the bio-based and sustainable materials, displayed a high efficiency in modifying the crystallization behavior, droplet surface and shape, as well as the overall performance of emulsions. Specifically, waxes induced the formation of a new hydrocarbon chain distances of 3.70 and 4.15 Å and slightly decreased the lamellar distance (d001) of the single crystallites, thus forming the large and rigid crystals in droplets. Interestingly, these large and rigid crystals in droplets tended to penetrate the interface film, forming the crystal bumps on the droplet surface and facilitating non-spherical shape transformation. The presence of rice bran wax (RW) and carnauba wax (CW) induced the droplet shape into ellipsoid and polyhedron shape, respectively. Furthermore, the uneven interface and non-spherical shape transformation promoted the crystalline droplet-droplet interaction, fabricating a three-dimensional network structure in O/W emulsions. Finally, both linear and nonlinear rheology strongly supported that waxes enhanced the crystalline droplet-droplet interaction and strengthened the network in O/W emulsions. Our findings give a clear insight into the effects of adding natural waxes into oil phase on the crystalline and physical behavior of emulsions, which provides a direction for the design and control of emulsion performance.
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Affiliation(s)
- Chunhuan Liu
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, National Engineering Research Center for Functional Food, National Engineering Laboratory for Cereal Fermentation Technology, Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, Jiangnan University, 1800 Lihu Road, Wuxi 214122, Jiangsu, People's Republic of China
| | - Zhaojun Zheng
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, National Engineering Research Center for Functional Food, National Engineering Laboratory for Cereal Fermentation Technology, Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, Jiangnan University, 1800 Lihu Road, Wuxi 214122, Jiangsu, People's Republic of China
| | - Chang Xi
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, National Engineering Research Center for Functional Food, National Engineering Laboratory for Cereal Fermentation Technology, Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, Jiangnan University, 1800 Lihu Road, Wuxi 214122, Jiangsu, People's Republic of China
| | - Yuanfa Liu
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, National Engineering Research Center for Functional Food, National Engineering Laboratory for Cereal Fermentation Technology, Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, Jiangnan University, 1800 Lihu Road, Wuxi 214122, Jiangsu, People's Republic of China.
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29
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Effect of water content, droplet size, and gelation on fat phase transition and water mobility in water-in-milk fat emulsions. Food Chem 2020; 333:127538. [DOI: 10.1016/j.foodchem.2020.127538] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Revised: 06/02/2020] [Accepted: 07/07/2020] [Indexed: 11/22/2022]
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30
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Kuroiwa T, Ito M, Okuyama Y, Yamashita K, Kanazawa A. Protein-Stabilized Palm-Oil-in-Water Emulsification Using Microchannel Array Devices under Controlled Temperature. Molecules 2020; 25:molecules25204805. [PMID: 33086710 PMCID: PMC7587966 DOI: 10.3390/molecules25204805] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 10/13/2020] [Accepted: 10/16/2020] [Indexed: 11/16/2022] Open
Abstract
Microchannel (MC) emulsification for the preparation of monodisperse oil-in-water (O/W) and water-in-oil-in-water (W/O/W) emulsions containing palm oil as the oil phase was investigated for application as basic material solid/semi-solid lipid microspheres for delivery carriers of nutrients and drugs. Emulsification was characterized by direct observation of droplet generation under various operation conditions, as such, the effects of type and concentration of emulsifiers, emulsification temperature, MC structure, and flow rate of to-be-dispersed phase on droplet generation via MC were investigated. Sodium caseinate (SC) was confirmed as the most suitable emulsifier among the examined emulsifiers, and monodisperse O/W and W/O/W emulsions stabilized by it were successfully obtained with 20 to 40 µm mean diameter (dm) using different types of MCs.
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Affiliation(s)
- Takashi Kuroiwa
- Department of Chemistry and Energy Engineering, Faculty of Science and Engineering, Tokyo City University, 1-28-1 Tamazutsumi, Setagaya, Tokyo 158-8557, Japan; (M.I.); (Y.O.); (K.Y.); (A.K.)
- Advanced Research Laboratories, Tokyo City University, 8-15-1 Todoroki, Setagaya, Tokyo 158-0082, Japan
- Correspondence: ; Tel.: +81-3-5707-0104
| | - Miki Ito
- Department of Chemistry and Energy Engineering, Faculty of Science and Engineering, Tokyo City University, 1-28-1 Tamazutsumi, Setagaya, Tokyo 158-8557, Japan; (M.I.); (Y.O.); (K.Y.); (A.K.)
| | - Yaeko Okuyama
- Department of Chemistry and Energy Engineering, Faculty of Science and Engineering, Tokyo City University, 1-28-1 Tamazutsumi, Setagaya, Tokyo 158-8557, Japan; (M.I.); (Y.O.); (K.Y.); (A.K.)
| | - Kanna Yamashita
- Department of Chemistry and Energy Engineering, Faculty of Science and Engineering, Tokyo City University, 1-28-1 Tamazutsumi, Setagaya, Tokyo 158-8557, Japan; (M.I.); (Y.O.); (K.Y.); (A.K.)
| | - Akihiko Kanazawa
- Department of Chemistry and Energy Engineering, Faculty of Science and Engineering, Tokyo City University, 1-28-1 Tamazutsumi, Setagaya, Tokyo 158-8557, Japan; (M.I.); (Y.O.); (K.Y.); (A.K.)
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31
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Macridachis-González J, Bayés-García L, Calvet T. An Insight into the Solid-State Miscibility of Triacylglycerol Crystals. Molecules 2020; 25:E4562. [PMID: 33036267 PMCID: PMC7583920 DOI: 10.3390/molecules25194562] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 10/02/2020] [Accepted: 10/04/2020] [Indexed: 11/28/2022] Open
Abstract
The crystallization properties of triacylglycerols (TAGs) strongly determine the functional properties of natural lipids. The polymorphic and mixing phase behavior of TAG molecules have long been, and still are, a hot topic of research with special relevance for the cosmetic, pharmaceutical, and food industry. To avoid the difficulties arising from the study of whole real fats, studies at the molecular level on mixtures of a limited number of TAGs has become an indispensable tool to identify the underlying causes of the physical properties in lipid systems. In particular, phase diagrams of binary mixtures of TAGs exhibiting a different degree of heterogeneity (monoacid or mixed fatty acids; molecular symmetry; the presence of cis or trans double bonds) have resulted in a significant breakthrough in our knowledge about structure-interaction-function relationships. The present work aims to provide an overview of the main reports regarding binary and ternary TAG systems, from the early studies to the most recent developments.
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Affiliation(s)
- Jorge Macridachis-González
- Departament de Mineralogia, Petrologia i Geología Aplicada, Facultat de Ciències de la Terra, Universitat de Barcelona, 08028 Barcelona, Spain; (L.B.-G.); (T.C.)
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32
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33
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Adhikari BM, Truong T, Bansal N, Bhandari B. Effect of CO
2
Bubbles on Crystallization Behavior of Anhydrous Milk Fat. J AM OIL CHEM SOC 2020. [DOI: 10.1002/aocs.12343] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Bhaskar Mani Adhikari
- School of Agriculture and Food SciencesThe University of Queensland Brisbane Queenland 4072 Australia
| | - Tuyen Truong
- School of Agriculture and Food SciencesThe University of Queensland Brisbane Queenland 4072 Australia
- School of ScienceRMIT University Melbourne Victoria 3083 Australia
| | - Nidhi Bansal
- School of Agriculture and Food SciencesThe University of Queensland Brisbane Queenland 4072 Australia
| | - Bhesh Bhandari
- School of Agriculture and Food SciencesThe University of Queensland Brisbane Queenland 4072 Australia
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34
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Leão K, Reis L, Speranza P, Rodrigues A, Ribeiro A, Macedo J, Macedo G. Physicochemical characterization and antimicrobial activity in novel systems containing buriti oil and structured lipids nanoemulsions. BIOTECHNOLOGY REPORTS (AMSTERDAM, NETHERLANDS) 2019; 24:e00365. [PMID: 31463206 PMCID: PMC6709151 DOI: 10.1016/j.btre.2019.e00365] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Revised: 07/29/2019] [Accepted: 07/30/2019] [Indexed: 12/20/2022]
Abstract
Buriti oil nanoemulsions were prepared using non-interesterified buriti oil or buriti oil interesterified for 6 or 24 h (NBO, NBO6h, and NBO24 h), respectively. The aim was to investigate the effects of interesterified oils on the physicochemical and biological properties of nanoemulsions. Samples were stored at 4 and 25 °C for 30 days, and their physicochemical properties and biological activities were evaluated. The mean droplet diameter of nanoemulsions ranged from 196 to 270 nm. NBO24 h had the smallest droplet size and was the most stable during the storage period. Furthermore, NBO24 h demonstrating the good oxidative stability, had a high antioxidant capacity, and was less susceptible to droplet aggregation. NBO and NBO24 h had similar biological activity against Gram-negative bacteria (Escherichia coli O157: H7); bacterial growth was inhibited by at least 60% at 3.12 mg mL-1. The nanoemulsions have interesting properties for the production of pharmaceutical, cosmetic, and food formulations with antimicrobial activity.
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Affiliation(s)
- K.M.M. Leão
- Department of Food and Nutrition, Faculty of Food Engineering, University of Campinas, Campinas, SP, 13083-970, Brazil
| | - L.V.C. Reis
- Department of Food and Nutrition, Faculty of Food Engineering, University of Campinas, Campinas, SP, 13083-970, Brazil
| | - P Speranza
- Department of Food and Nutrition, Faculty of Food Engineering, University of Campinas, Campinas, SP, 13083-970, Brazil
| | - A.P. Rodrigues
- Department of Food Science, Faculty of Food Engineering, University of Campinas, Campinas, SP, 13083-970, Brazil
| | - A.P.B. Ribeiro
- Department of Food Technology, Faculty of Food Engineering, University of Campinas, Campinas, SP, 13083-970, Brazil
| | - J.A. Macedo
- Department of Food and Nutrition, Faculty of Food Engineering, University of Campinas, Campinas, SP, 13083-970, Brazil
| | - G.A. Macedo
- Department of Food and Nutrition, Faculty of Food Engineering, University of Campinas, Campinas, SP, 13083-970, Brazil
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35
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Jiang J, Song Z, Wang Q, Xu X, Liu Y, Xiong YL. Ultrasound-mediated interfacial protein adsorption and fat crystallization in cholesterol-reduced lard emulsion. ULTRASONICS SONOCHEMISTRY 2019; 58:104641. [PMID: 31450308 DOI: 10.1016/j.ultsonch.2019.104641] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Revised: 06/08/2019] [Accepted: 06/14/2019] [Indexed: 05/23/2023]
Abstract
Lard with a substantially reduced cholesterol content through aqueous enzyme extraction is an attractive source of lipid in healthy and nutritious emulsion food product development. The objective of this study was to elucidate the crystallization behavior (4-20 °C) of emulsions prepared from low-cholesterol lard in relation to protein emulsifier (2 and 4% whey protein isolate, WPI) and ultrasound (475 w, 5 min) treatments. The physicochemical properties and fat crystallization pattern of the emulsions were investigated. Emulsions with 4% WPI were superior to those with 2% WPI on interfacial adsorption and crystal size reduction. Ultrasonic treatment of prepared emulsions further decreased fat crystal size, promoted small and uniform crystal distribution, and slightly destabilized emulsions. Protein concentration and ultrasonic treatment had no obvious effect on crystal transition from β' to the more stable β-form based on X-ray diffraction. The melting properties determined by differential scanning calorimetry indicated that emulsified lard had a lower onset melting temperature than bulk lard, and with ultrasound treatment, the melting enthalpy increased remarkably. The ultrasound-induced change in fat crystalline structure and emulsion meta-stability may be valuable to the manufacture of healthy, emulsion-incorporated food products.
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Affiliation(s)
- Jiang Jiang
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, China
| | - Ziye Song
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, China
| | - Qingling Wang
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, China
| | - Xiaonan Xu
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, China
| | - Yuanfa Liu
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, China.
| | - Youling L Xiong
- Department of Animal and Food Sciences, University of Kentucky, Lexington, KY 40546, United States
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36
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Wijarnprecha K, de Vries A, Santiwattana P, Sonwai S, Rousseau D. Microstructure and rheology of oleogel-stabilized water-in-oil emulsions containing crystal-stabilized droplets as active fillers. Lebensm Wiss Technol 2019. [DOI: 10.1016/j.lwt.2019.04.059] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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37
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Insights into the behavior of six rationally designed peptides based on Escherichia coli's OmpA at the water-dodecane interface. PLoS One 2019; 14:e0223670. [PMID: 31600354 PMCID: PMC6786535 DOI: 10.1371/journal.pone.0223670] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Accepted: 09/25/2019] [Indexed: 11/19/2022] Open
Abstract
The Escherichia coli's membrane protein OmpA has been identified as a potential biosurfactant due to their amphiphilic nature, and their capacity to stabilize emulsions of dodecane in water. In this study, the influence of surfactant type, concentration, preservation time and droplet size on the crystallization of n-dodecane and water, in oil-in-water emulsions stabilized with six rationally designed Escherichia coli's OmpA-based peptides was investigated. A differential scanning calorimetry (DSC) protocol was established using emulsions stabilized with Tween 20® and Tween 80®. A relationship between the surfactant concentration and the crystallization temperatures of n-dodecane and water was observed, where the crystallization temperatures seem to be dependent on the preservation time. A deconvolution analysis shows that the peak morphology possibly depends on the interactions at the interface because the enthalpic contributions of each Gaussian peak remained similar in emulsions stabilized with the same peptide. Adsorption results show that the main driver for adsorption and thus stabilization of emulsions is polar interactions (e.g. H-bonding) through the hydrophilic parts of the peptides. Those peptides with a preponderance of polar interaction groups distribution (i.e. NH2, COOH, imidazole) showed the highest interfacial activity under favorable pH conditions. This suggests that custom-made peptides whose hydrophilic/hydrophobic regions can be fine-tuned depending on the application can be easily produced with the additional advantage of their biodegradable nature.
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Moens K, Tzompa-Sosa DA, Van de Walle D, Van der Meeren P, Dewettinck K. Influence of cooling rate on partial coalescence in natural dairy cream. Food Res Int 2019; 120:819-828. [DOI: 10.1016/j.foodres.2018.11.044] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Revised: 10/17/2018] [Accepted: 11/19/2018] [Indexed: 11/25/2022]
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Ren Q, Li L, Dudu OE, Ma Y. Thermal and structural changes of pasteurized milk fat globules during storage. FOOD BIOSCI 2019. [DOI: 10.1016/j.fbio.2018.12.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Rafanan R, Rousseau D. Dispersed droplets as tunable fillers in water-in-oil emulsions stabilized with fat crystals. J FOOD ENG 2019. [DOI: 10.1016/j.jfoodeng.2018.09.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Preparation of camellia oil-based W/O emulsions stabilized by tea polyphenol palmitate: Structuring camellia oil as a potential solid fat replacer. Food Chem 2019; 276:209-217. [DOI: 10.1016/j.foodchem.2018.09.161] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2018] [Revised: 08/29/2018] [Accepted: 09/26/2018] [Indexed: 02/03/2023]
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Jiang J, Jing W, Xiong YL, Liu Y. Interfacial competitive adsorption of different amphipathicity emulsifiers and milk protein affect fat crystallization, physical properties, and morphology of frozen aerated emulsion. Food Hydrocoll 2019. [DOI: 10.1016/j.foodhyd.2018.09.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Jiao W, Li L, Yu A, Zhao D, Sheng B, Aikelamu M, Li B, Zhang X. In Vitro Gastrointestinal Digestibility of Crystalline Oil-in-Water Emulsions: Influence of Fat Crystal Structure. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2019; 67:927-934. [PMID: 30608158 DOI: 10.1021/acs.jafc.8b04287] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
To investigate how the fat crystal structure affects lipid in vitro digestibility, 30% palm stearin-in-water emulsions were prepared after storage at different temperatures (4, 25, and 37 °C) for 1 h, which consisted of different polymorphic forms, sizes, and quantities of fat crystals. The variation of particle size ( d4,3), zeta potential, and microstructure during the gastrointestinal digestion and the free fatty acid (FFA) released in small intestine phase were investigated. After oral and gastric digestion, all of the emulsions underwent partial or complete coalescence and flocculation. During intestinal digestion, the d4,3 and zeta potentials did not notably affect lipid digestion. The FFA-released assay results indicated that the lipid digestion extent decreased as the fat crystal size and content of the β polymorph increased, and there was no obvious relationship between FFA release and fat crystal quantity or solid fat content (SFC). This study highlighted the crucial roles of fat crystal size and polymorphic form in regulating the digestion behavior of lipid-based O/W emulsions.
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Affiliation(s)
- Wenjuan Jiao
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety , South China University of Technology , Guangzhou 510640 , China
| | - Lin Li
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety , South China University of Technology , Guangzhou 510640 , China
- School of Chemical Engineering and Energy Technology , Dongguan University of Technology , College Road 1 , Dongguan 523808 , China
| | - Anling Yu
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety , South China University of Technology , Guangzhou 510640 , China
| | - Di Zhao
- Key Laboratory of Meat Processing and Quality Control, MOE; Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control; Key Laboratory of Meat Products Processing, MOA ; Nanjing Agricultural University ; Nanjing 210095 , People's Republic of China
| | - Bulei Sheng
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety , South China University of Technology , Guangzhou 510640 , China
| | - Medinu Aikelamu
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety , South China University of Technology , Guangzhou 510640 , China
| | - Bing Li
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety , South China University of Technology , Guangzhou 510640 , China
| | - Xia Zhang
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety , South China University of Technology , Guangzhou 510640 , China
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Sebben DA, Gao N, Gillies G, Beattie DA, Krasowska M. Fractionation and characterisation of hard milk fat crystals using atomic force microscopy. Food Chem 2018; 279:98-104. [PMID: 30611517 DOI: 10.1016/j.foodchem.2018.11.136] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Revised: 11/22/2018] [Accepted: 11/26/2018] [Indexed: 10/27/2022]
Abstract
The hard milk fat (HMF) fraction of milk fat was isolated via dry, thermal fractionation, followed by a solvent washing process. The resulting HMF crystals were visibly free of entrapped liquid fat, and subsequently characterised by thermal analysis, X-ray diffraction, and electron microscopy. The HMF crystals were found to be mostly β' and β'2 crystalline structures, with a lamellar thickness of 42.7-44.1 Å. Additionally, crystal size was determined to be ≥1 μm in length and 0.4-1 μm in width. Atomic force microscopy (AFM) was used to further characterise the HMF crystals. AFM enabled 3D mapping and visualisation of crystal layering, as well as simple determination of layer thickness (∼4.2 ± 0.8 nm); a value in close agreement with the results obtained via X-ray analysis. The AFM characterisation approach provides a simple method of characterising HMF crystals, without suffering the limitations of other widely used techniques.
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Affiliation(s)
- Damien A Sebben
- Future Industries Institute, University of South Australia, Mawson Lakes Campus, Mawson Lakes, SA 5095, Australia.
| | - Nan Gao
- Future Industries Institute, University of South Australia, Mawson Lakes Campus, Mawson Lakes, SA 5095, Australia
| | - Graeme Gillies
- Fonterra Research and Development Centre, Dairy Farm Road, Fitzherbert, Palmerston North 4442, New Zealand
| | - David A Beattie
- Future Industries Institute, University of South Australia, Mawson Lakes Campus, Mawson Lakes, SA 5095, Australia; School of Information Technology & Mathematical Sciences, University of South Australia, Mawson Lakes Campus, Mawson Lakes, SA 5095, Australia
| | - Marta Krasowska
- Future Industries Institute, University of South Australia, Mawson Lakes Campus, Mawson Lakes, SA 5095, Australia; School of Information Technology & Mathematical Sciences, University of South Australia, Mawson Lakes Campus, Mawson Lakes, SA 5095, Australia.
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Solid lipid nanoparticles and nanostructured lipid carriers: A review emphasizing on particle structure and drug release. Eur J Pharm Biopharm 2018; 133:285-308. [DOI: 10.1016/j.ejpb.2018.10.017] [Citation(s) in RCA: 199] [Impact Index Per Article: 33.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Revised: 10/17/2018] [Accepted: 10/22/2018] [Indexed: 12/11/2022]
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Moens K, Tavernier I, Dewettinck K. Crystallization behavior of emulsified fats influences shear-induced partial coalescence. Food Res Int 2018; 113:362-370. [DOI: 10.1016/j.foodres.2018.07.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Revised: 06/14/2018] [Accepted: 07/03/2018] [Indexed: 11/28/2022]
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47
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Thilakarathna SH, Wright AJ. Attenuation of Palm Stearin Emulsion Droplet in Vitro Lipolysis with Crystallinity and Gastric Aggregation. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:10292-10299. [PMID: 30247885 DOI: 10.1021/acs.jafc.8b02636] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Emulsions with partially crystalline solid (SE) and undercooled-liquid (LE) droplets with equivalent droplet sizes (centering ∼416 nm), surface charges (∼-56 mV), and spherical morphologies were prepared by hot microfluidization based on 10% palm stearin and 0.4% Span 60. Lipid crystallinity attenuated early gastroduodenal lipolysis in vitro ( p < 0.05), both with and without inclusion of a gastric phase ( p < 0.05). Gastric exposure, in particular acidic pH, led to partial coalescence of SE and flocculation and partial crystallization of LE, and it attenuated the rate and extent of lipolysis in both samples. In vitro shear conditions further impacted colloidal stability, particularly for SE, with implications for digestibility. Although lipid crystallinity consistently attenuated early lipolysis, gastric-phase SE partial coalescence had a relatively greater impact on digestibility than did droplet physical state. These findings show that a complex interplay exists among a droplet's physical state, colloidal properties, and digestion conditions, which combine to impact emulsion in vitro lipolysis.
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Affiliation(s)
- Surangi H Thilakarathna
- Department of Human Health and Nutritional Sciences , University of Guelph , Guelph , Ontario N1G 2W1 , Canada
| | - Amanda J Wright
- Department of Human Health and Nutritional Sciences , University of Guelph , Guelph , Ontario N1G 2W1 , Canada
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Glorieux S, Steen L, Van de Walle D, Dewettinck K, Foubert I, Fraeye I. Effect of Meat Type, Animal Fat Type, and Cooking Temperature on Microstructural and Macroscopic Properties of Cooked Sausages. FOOD BIOPROCESS TECH 2018. [DOI: 10.1007/s11947-018-2190-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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50
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Dyett B, Zychowski L, Bao L, Meikle TG, Peng S, Yu H, Li M, Strachan J, Kirby N, Logan A, Conn CE, Zhang X. Crystallization of Femtoliter Surface Droplet Arrays Revealed by Synchrotron Small-Angle X-ray Scattering. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:9470-9476. [PMID: 30021434 DOI: 10.1021/acs.langmuir.8b01252] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The crystallization of oil droplets is critical in the processing and storage of lipid-based food and pharmaceutical products. Arrays of femtoliter droplets on a surface offer a unique opportunity to study surfactant-free colloidlike systems. In this work, the crystal growth process in these confined droplets was followed by cooling a model lipid (trimyristin) from a liquid state utilizing synchrotron small-angle X-ray scattering (SAXS). The measurements by SAXS demonstrated a reduced crystallization rate and a greater degree of supercooling required to trigger lipid crystallization in droplets compared to those of bulk lipids. These results suggest that surface droplets crystallize in a stochastic manner. Interestingly, the crystallization rate is slower for larger femtoliter droplets, which may be explained by the onset of crystallization from the three-phase contact line. The larger surface nanodroplets exhibit a smaller ratio of droplet volume to the length of three-phase contact line and hence a slower crystallization rate.
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Affiliation(s)
| | - Lisa Zychowski
- CSIRO Agriculture and Food , Werribee , Victoria 3030 , Australia
| | | | | | | | | | | | | | - Nigel Kirby
- Australian Synchrotron , 800 Blackburn Road , Clayton , Victoria 3169 , Australia
| | - Amy Logan
- CSIRO Agriculture and Food , Werribee , Victoria 3030 , Australia
| | | | - Xuehua Zhang
- Department of Chemical and Materials Engineering , University of Alberta , Edmonton , T6G1H9 Alberta , Canada
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