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231225s2018 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.8b01438
|2 doi
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|a pubmed24n0957.xml
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|a DE-627
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|a eng
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| 100 |
1 |
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|a Zembyla, Morfo
|e verfasserin
|4 aut
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| 245 |
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|a Water-In-Oil Pickering Emulsions Stabilized by Water-Insoluble Polyphenol Crystals
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|c 2018
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|a Text
|b txt
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|a ƒaComputermedien
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|a Date Completed 23.10.2018
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|a Date Revised 23.10.2018
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a In recent years, there has been a resurgence of interest in Pickering emulsions because of the recognition of the unique high steric stabilization provided by particles at interfaces. This interest is particularly keen for water-in-oil (W/O) emulsions because of the limited range of suitable Pickering stabilizers available. We demonstrate for the first time that W/O emulsions can be stabilized by using crystals from naturally occurring polyphenols (curcumin and quercetin particles). These particles were assessed based on their size, microstructure, contact angle, interfacial tension, and ζ-potential measurements in an attempt to predict the way that they act as Pickering stabilizers. Static light-scattering results and microstructural analysis at various length scales [optical microscopy, confocal laser scanning microscopy (CLSM), and scanning electron microscopy (SEM)] confirmed that the quercetin particles has a nearly perfect crystalline rod shape with a high aspect ratio; that is, the ratio of length to diameter ( L/ D) was ca. 2.5:1-7:1. On the other hand, the curcumin particles ( d3,2 = 0.2 μm) had a polyhedral shape. Droplet sizing and CLSM revealed that there was an optimum concentration (0.14 and 0.25 wt % for quercetin and curcumin, respectively) where smaller water droplets were formed ( d3,2 ≈ 6 μm). Interfacial shear viscosity (η i) measurements confirmed that a stronger film was formed at the interface with quercetin particles (η i ≈ 25 N s m-1) rather than with curcumin particles (η i ≈ 1.2 N s m-1) possibly because of the difference in the shape and size of the two crystals. This study provides new insights into the creation of Pickering W/O emulsions with polyphenol crystals and may lead to various soft matter applications where Pickering stabilization using biocompatible particles is a necessity
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Murray, Brent S
|e verfasserin
|4 aut
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|a Sarkar, Anwesha
|e verfasserin
|4 aut
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 34(2018), 34 vom: 28. Aug., Seite 10001-10011
|w (DE-627)NLM098181009
|x 1520-5827
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| 773 |
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|g volume:34
|g year:2018
|g number:34
|g day:28
|g month:08
|g pages:10001-10011
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|u http://dx.doi.org/10.1021/acs.langmuir.8b01438
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