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Article ; Online: Evaluating the Impact of Hydrophobic Silicon Dioxide in the Interfacial Properties of Lung Surfactant Films.

Guzmán, Eduardo / Santini, Eva / Ferrari, Michele / Liggieri, Libero / Ravera, Francesca

Environmental science & technology

2022 Volume 56, Issue 11, Page(s) 7308–7318

Abstract: The interaction of hydrophobic silicon dioxide particles (fumed silicon dioxide), as model air pollutants, and Langmuir monolayers of a porcine lung surfactant extract has been studied in order to try to shed light on the physicochemical bases underlying ...

Abstract	The interaction of hydrophobic silicon dioxide particles (fumed silicon dioxide), as model air pollutants, and Langmuir monolayers of a porcine lung surfactant extract has been studied in order to try to shed light on the physicochemical bases underlying the potential adverse effects associated with pollutant inhalation. The surface pressure-area isotherms of lung surfactant (LS) films including increasing amounts of particles revealed that particle incorporation into LS monolayers modifies the organization of the molecules at the water/vapor interface, which alters the mechanical resistance of the interfacial films, hindering the ability of LS layers for reducing the surface tension, and reestablishing the interface upon compression. This influences the normal physiological function of LS as is inferred from the analysis of the response of the Langmuir films upon the incorporation of particles against harmonic changes of the interfacial area (successive compression-expansion cycles). These experiments evidenced that particles alter the relaxation mechanisms of LS films, which may be correlated to a modification of the transport of material within the interface and between the interface and the adjacent fluid during the respiratory cycle.
MeSH term(s)	Animals ; Lung ; Pressure ; Pulmonary Surfactants/chemistry ; Pulmonary Surfactants/metabolism ; Silicon Dioxide ; Surface Properties ; Surface Tension ; Surface-Active Agents/metabolism ; Swine
Chemical Substances	Pulmonary Surfactants ; Surface-Active Agents ; Silicon Dioxide (7631-86-9)
Language	English
Publishing date	2022-01-25
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ISSN	1520-5851
ISSN (online)	1520-5851
DOI	10.1021/acs.est.1c06885
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Article: Lung surfactant-particles at fluid interfaces for toxicity assessments

Guzmán, Eduardo / Santini, Eva

Current opinion in colloid & interface science. 2019 Feb., v. 39

2019

Abstract: Lung surfactant is a complex mixture of lipids and proteins which plays a major role in the respiratory cycle. This makes necessary to understand the effects of different external factors or agents, for example, inhaled particles, as a potential source ... ...

Abstract	Lung surfactant is a complex mixture of lipids and proteins which plays a major role in the respiratory cycle. This makes necessary to understand the effects of different external factors or agents, for example, inhaled particles, as a potential source of alteration of the normal physiological response of lung surfactant. However, in most cases, in vivo studies are difficult to perform, and preliminary studies based in model systems are required. Films of lipids or mixtures of lipids and proteins at the water–vapor interface are accounted as one of the most useful methodologies for initial assessments of the potential toxicity of inhaled particles. Thus, the study of the modifications induced by the incorporation of colloidal particles in the interfacial properties of layers mimicking some of the physicochemical features of lung surfactant might provide a first evaluation of the risks and hazards associated with the inhalation of particulate matter. Considering the importance of particles in technology and industry, it is mandatory to develop strategies providing information about toxicological aspects of these widespread materials. This review focuses its interest on the recent advancements on the application of studied bases on monolayers at the fluid interface as preliminary assay for deepening on a complex situation with biological interest.
Keywords	breathing ; colloids ; in vivo studies ; industry ; lipids ; lungs ; models ; particulates ; physiological response ; proteins ; risk assessment ; surfactants ; toxicity ; toxicology ; water vapor
Language	English
Dates of publication	2019-02
Size	p. 24-39.
Publishing place	Elsevier Ltd
Document type	Article
ZDB-ID	2019683-0
ISSN	1359-0294
ISSN	1359-0294
DOI	10.1016/j.cocis.2019.01.003
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Article: Evaluating the Impact of Hydrophobic Silicon Dioxide in the Interfacial Properties of Lung Surfactant Films

Guzmán, Eduardo / Santini, Eva / Ferrari, Michele / Liggieri, Libero / Ravera, Francesca

Environmental science & technology. 2022 Jan. 26, v. 56, no. 11

2022

Abstract	The interaction of hydrophobic silicon dioxide particles (fumed silicon dioxide), as model air pollutants, and Langmuir monolayers of a porcine lung surfactant extract has been studied in order to try to shed light on the physicochemical bases underlying the potential adverse effects associated with pollutant inhalation. The surface pressure–area isotherms of lung surfactant (LS) films including increasing amounts of particles revealed that particle incorporation into LS monolayers modifies the organization of the molecules at the water/vapor interface, which alters the mechanical resistance of the interfacial films, hindering the ability of LS layers for reducing the surface tension, and reestablishing the interface upon compression. This influences the normal physiological function of LS as is inferred from the analysis of the response of the Langmuir films upon the incorporation of particles against harmonic changes of the interfacial area (successive compression–expansion cycles). These experiments evidenced that particles alter the relaxation mechanisms of LS films, which may be correlated to a modification of the transport of material within the interface and between the interface and the adjacent fluid during the respiratory cycle.
Keywords	air ; breathing ; hydrophobicity ; lungs ; mechanical properties ; silica ; surface tension ; surfactants ; swine ; technology ; vapors
Language	English
Dates of publication	2022-0126
Size	p. 7308-7318.
Publishing place	American Chemical Society
Document type	Article
ISSN	1520-5851
DOI	10.1021/acs.est.1c06885
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Article: Evaluation of the impact of carbonaceous particles in the mechanical performance of lipid Langmuir monolayers

Guzmán, Eduardo / Santini, Eva / Ferrari, Michele / Liggieri, Libero / Ravera, Francesca

Colloids and surfaces. 2022 Feb. 05, v. 634

2022

Abstract: Carbonaceous particles are accounted among the most common environmental pollutants. This makes necessary a careful examination of their potential impact on the physico-chemical properties of different biological films, e.g. tear film, skin, or lung ... ...

Abstract	Carbonaceous particles are accounted among the most common environmental pollutants. This makes necessary a careful examination of their potential impact on the physico-chemical properties of different biological films, e.g. tear film, skin, or lung surfactant. This work analyzes the interaction of three different types of carbonaceous particles with Langmuir monolayers of 1,2-Dipalmitoyl-sn-glycerol-3-phosphocholine (DPPC) spread at the water/vapor interface. This type of studies can be exploited as preliminary in vitro tests for evaluating the potential risks and hazards of this type of pollutants for human health, which requires to study the effect of the particles on the ability of lipid layers for reducing the surface tension under static and dynamics conditions. The obtained results have shown that the insertion of particles into lipid films leads to the emergence of excluded area-like effects which modify the interfacial cohesion and packing. This hinders partially the ability of the lipid films for reducing the surface tension, which may present important adverse effects for the normal physiological performance of lipid membranes, and in particular for the performance of lung surfactant layers. Furthermore, the analysis of the response of lipid layers including carbonaceous particles against mechanical stresses also evidenced that particle incorporation worsens the mechanical performance of lipid layers, which may alter both their functional and structural roles.
Keywords	cohesion ; human health ; lipids ; lungs ; surface tension ; surfactants ; vapors
Language	English
Dates of publication	2022-0205
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	1500517-3
ISSN	0927-7757
ISSN	0927-7757
DOI	10.1016/j.colsurfa.2021.127974
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Article ; Online: Emulsification and emulsion stability: The role of the interfacial properties.

Ravera, Francesca / Dziza, Katarzyna / Santini, Eva / Cristofolini, Luigi / Liggieri, Libero

Advances in colloid and interface science

2020 Volume 288, Page(s) 102344

Abstract: In this review, we highlight and discuss the effects of interfacial properties on the major mechanisms governing the aging of emulsions: flocculation, coalescence and Ostwald ripening. The process of emulsification is also addressed, as it is well ... ...

Abstract	In this review, we highlight and discuss the effects of interfacial properties on the major mechanisms governing the aging of emulsions: flocculation, coalescence and Ostwald ripening. The process of emulsification is also addressed, as it is well recognized that the adsorption properties of emulsifiers play an important role on it. The consolidated background on these phenomena is briefly summarised based on selected literature, reporting relevant findings and results, and discussing some criticalities. The typical experimental approaches adopted to investigate the above effects are also summarised, underlining in particular the role of adsorption at the droplet interface. Attention is paid to different types of surface-active species involved with emulsion production, including solid particles. The latter being of increasing interest in a wide variety of emulsions-related products and technologies in various fields. The possibility to stop the long term aging caused by Ostwald ripening in emulsions is also discussed, quantifying under which conditions it may occur in practice.
Language	English
Publishing date	2020-12-14
Publishing country	Netherlands
Document type	Journal Article ; Review
ZDB-ID	210507-x
ISSN	1873-3727 ; 0001-8686
ISSN (online)	1873-3727
ISSN	0001-8686
DOI	10.1016/j.cis.2020.102344
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Article ; Online: Physico-chemical foundations of particle-laden fluid interfaces.

Maestro, Armando / Santini, Eva / Guzmán, Eduardo

The European physical journal. E, Soft matter

2018 Volume 41, Issue 8, Page(s) 97

Abstract: Particle-laden interfaces are ubiquitous nowadays. The understanding of their properties and structure is essential for solving different problems of technological and industrial relevance; e.g. stabilization of foams, emulsions and thin films. These ... ...

Abstract	Particle-laden interfaces are ubiquitous nowadays. The understanding of their properties and structure is essential for solving different problems of technological and industrial relevance; e.g. stabilization of foams, emulsions and thin films. These rely on the response of the interface to mechanical perturbations. The complex mechanical response appearing in particle-laden interfaces requires deepening on the understanding of physico-chemical mechanisms underlying the assembly of particles at interface which plays a central role in the distribution of particles at the interface, and in the complex interfacial dynamics appearing in these systems. Therefore, the study of particle-laden interfaces deserves attention to provide a comprehensive explanation on the complex relaxation mechanisms involved in the stabilization of fluid interfaces.
Language	English
Publishing date	2018-08-28
Publishing country	France
Document type	Journal Article ; Review
ZDB-ID	2004003-9
ISSN	1292-895X ; 1292-8941
ISSN (online)	1292-895X
ISSN	1292-8941
DOI	10.1140/epje/i2018-11708-6
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Article ; Online: Hydrophobisation of Silica Nanoparticles Using Lauroyl Ethyl Arginate and Chitosan Mixtures to Induce the Foaming Process.

Krzan, Marcel / Jarek, Ewelina / Petkova, Hristina / Santini, Eva / Szyk-Warszynska, Lilianna / Ravera, Francesca / Liggieri, Libero / Mileva, Elena / Warszynski, Piotr

Polymers

2022 Volume 14, Issue 19

Abstract: We studied silica suspensions with chitosan and biodegradable synthetic surfactant lauroyl ethyl arginate (LAE). Hydrophilic and negatively charged silica nanoparticles were neutralised due to the coating with chitosan. That presence of LAE led to the ... ...

Abstract	We studied silica suspensions with chitosan and biodegradable synthetic surfactant lauroyl ethyl arginate (LAE). Hydrophilic and negatively charged silica nanoparticles were neutralised due to the coating with chitosan. That presence of LAE led to the partial hydrophobisation of their surface, which favoured their attachment to the surface of a thin foam film. It was found that the presence of small and medium-sized (6-9 nm) hydrophobic particles in the interfacial layer of lamella foam film inhibited the coalescence and coarsening processes, which prolonged the life of the foam. Furthermore, hydrophobising of 30 nm particles allowed the formation of large aggregates precipitating from the mixture under steady-state conditions. These aggregates, however, under the conditions of the dynamic froth flotation process in the foam column, were floated into the foam layer. As a result, they were trapped in the foam film and Plateau borders, effectively preventing liquid leakage out of the foam. These results demonstrate the efficiency of using chitosan-LAE mixtures to remove silica nanoparticles from aqueous phase by foaming and flotation.
Language	English
Publishing date	2022-09-28
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2527146-5
ISSN	2073-4360 ; 2073-4360
ISSN (online)	2073-4360
ISSN	2073-4360
DOI	10.3390/polym14194076
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Article ; Online: Surface Properties of Saponin-Chitosan Mixtures.

Krzan, Marcel / Rey, Natalia García / Jarek, Ewelina / Czakaj, Agnieszka / Santini, Eva / Ravera, Francesca / Liggieri, Libero / Warszynski, Piotr / Braunschweig, Björn

Molecules (Basel, Switzerland)

2022 Volume 27, Issue 21

Abstract: The surface properties of saponin and saponin-chitosan mixtures were analysed as a function of their bulk mixing ratio using vibrational sum-frequency generation (SFG), surface tensiometry and dilational rheology measurements. Our experiments show that ... ...

Abstract	The surface properties of saponin and saponin-chitosan mixtures were analysed as a function of their bulk mixing ratio using vibrational sum-frequency generation (SFG), surface tensiometry and dilational rheology measurements. Our experiments show that saponin-chitosan mixtures present some remarkable properties, such as a strong amphiphilicity of the saponin and high dilational viscoelasticity. We believe this points to the presence of chitosan in the adsorption layer, despite its complete lack of surface activity. We explain this phenomenon by electrostatic interactions between the saponin as an anionic surfactant and chitosan as a polycation, leading to surface-active saponin-chitosan complexes and aggregates. Analysing the SFG intensity of the O-H stretching bands from interfacial water molecules, we found that in the case of pH 3.4 for a mixture consisting of 0.1 g/L saponin and 0.001 g/L chitosan, the adsorption layer was electrically neutral. This conclusion from SFG spectra is corroborated by results from surface tensiometry showing a significant reduction in surface tension and effects on the dilational surface elasticity strictly at saponin/chitosan ratios, where SFG spectra indicate zero net charge at the air-water interface.
MeSH term(s)	Chitosan ; Saponins/chemistry ; Surface Tension ; Surface Properties ; Surface-Active Agents/chemistry ; Adsorption ; Water/chemistry
Chemical Substances	Chitosan (9012-76-4) ; Saponins ; Surface-Active Agents ; Water (059QF0KO0R)
Language	English
Publishing date	2022-11-03
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	1413402-0
ISSN	1420-3049 ; 1431-5165 ; 1420-3049
ISSN (online)	1420-3049
ISSN	1431-5165 ; 1420-3049
DOI	10.3390/molecules27217505
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Article: Surface properties of binary TiO2 - SiO2 nanoparticle dispersions relevant for foams stabilization

Llamas, Sara / Liggieri, Libero / Ponce Torres, Alberto / Ravera, Francesca / Santini, Eva

Colloids and surfaces. 2019 Aug. 20, v. 575

2019

Abstract: This work focuses on the surface properties of binary dispersions of nanoparticles, namely Titania (TiO2) and amorphous silica (SiO2), associated to a short chain ionic surfactant (CTAB) which has the role of modifying their amphiphilicity, inducing the ... ...

Abstract	This work focuses on the surface properties of binary dispersions of nanoparticles, namely Titania (TiO2) and amorphous silica (SiO2), associated to a short chain ionic surfactant (CTAB) which has the role of modifying their amphiphilicity, inducing the segregation of particle-surfactant complexes at the liquid interface. The foams produced by these dispersions are also investigated. The adsorption of these complexes at water-air interfaces has been investigated by surface tension and dilational rheology measurements. The results obtained, discussed on the basis of the main characteristics of the two types of particles, allow us to understand the role of the dispersion composition and, especially, of the cationic surfactant in the determination of the surface activity of the different complexes and of the properties of the mixed NP layers at the water- air interfaces. In particular, important synergetic effects on the interfacial properties have been observed, when both types of particles are adsorbed. These effects reflect in an enhanced stability of the corresponding foams. In addition, the study evidences the possibility to formulate binary dispersions in order to drive selectively the adsorption of one type of particles at the liquid interface, which can be particularly significant for the formulation of particle-stabilized foams with tailored lamella and cell surface composition/structure.
Keywords	adsorption ; air ; cationic surfactants ; cetyltrimethylammonium bromide ; dispersions ; foams ; liquid-air interface ; liquids ; nanoparticles ; rheology ; silica ; surface tension ; titanium dioxide
Language	English
Dates of publication	2019-0820
Size	p. 299-309.
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	1500517-3
ISSN	0927-7757
ISSN	0927-7757
DOI	10.1016/j.colsurfa.2019.05.023
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Article: Surface properties and foamability of saponin and saponin-chitosan systems

Santini, Eva / Jarek, Ewelina / Krzan, Marcel / Liggieri, Libero / Ravera, Francesca / Warszynski, Piotr

Colloids and surfaces. 2019 Sept. 01, v. 181

2019

Abstract: In this work we investigate the surface properties and foamability of saponin and mixed saponin-chitosan solutions. These natural compounds are widely used in various cosmetic, pharmaceutical and food technologies because of their efficiency as bio- ... ...

Abstract	In this work we investigate the surface properties and foamability of saponin and mixed saponin-chitosan solutions. These natural compounds are widely used in various cosmetic, pharmaceutical and food technologies because of their efficiency as bio-active components and their biodegradability.These compounds and their mixture were investigated versus the composition by surface tension and dilational rheology measurements and the respective foams analysed at the formation and during their entire time evolution.The results show that these systems present peculiarities relevant for their utilisation as foam stabilisers, such as strong amphiphilicity of saponin and high values of dilational viscoelasticity. The behaviour of foams has been interpreted on the basis of the adsorption properties at liquid-air interface and the interfacial rheology. Specifically, we found a remarkable effect of the chitosan on the long-time stability of foams. This has been explained considering the changes of the bulk properties induced by chitosan, which influence also the dynamics of the saponin adsorption.This work aims to contribute to the development of new formulations of biodegradable and biocompatible foams for industrial applications, where it is advantageous to reduce the use of synthetic surfactants in commercial products.
Keywords	adsorption ; biodegradability ; chitosan ; foams ; industrial applications ; liquid-air interface ; rheology ; saponins ; surface tension ; surfactants ; viscoelasticity
Language	English
Dates of publication	2019-0901
Size	p. 198-206.
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	1500523-9
ISSN	1873-4367 ; 0927-7765
ISSN (online)	1873-4367
ISSN	0927-7765
DOI	10.1016/j.colsurfb.2019.05.035
Database	NAL-Catalogue (AGRICOLA)

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