Surface properties of adsorption layers formed from triterpenoid and steroid saponins

Pagureva, Nevena; Tcholakova, Slavka; Golemanov, Konstantin; Denkov, Nikolai D.; Pelan, Eddie G.; Stoyanov, Simeon D.

doi:10.1016/j.colsurfa.2015.12.001

Cited by 69 publications

(83 citation statements)

References 33 publications

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“…The surface dilational viscoelastic properties of the present soapwort extracts are superior to all steroid saponins described so far, which show generally very poor viscoelastic properties (e.g., from Tribulus terrestris, Yucca schidigera, or Trigonella foenum-graecum (Golemanov et al, 2013;Mustan et al, 2017). Interestingly, in the study of Pagureva et al (2016), the crude plant extracts showed generally low values of surface dilational elastic moduli: for Aesculus hippocastanum (horse chestnuts), Sapindus triofilatus (soapnuts) and Acacia concinna, E' did not exceed 60 mN m −1 , which is significantly lower than the crude soapwort extracts described in the present study. In this respect, the latter is closer to Q. saponins, where the crude and purified extracts showed comparable E' values (Pagureva et al, 2016;Wojciechowski, 2013).…”

Section: Discussioncontrasting

confidence: 78%

“…Interestingly, in the study of Pagureva et al (2016), the crude plant extracts showed generally low values of surface dilational elastic moduli: for Aesculus hippocastanum (horse chestnuts), Sapindus triofilatus (soapnuts) and Acacia concinna, E' did not exceed 60 mN m −1 , which is significantly lower than the crude soapwort extracts described in the present study. In this respect, the latter is closer to Q. saponins, where the crude and purified extracts showed comparable E' values (Pagureva et al, 2016;Wojciechowski, 2013).…”

Section: Discussioncontrasting

confidence: 78%

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How Does the Surface Activity of Soapwort (Saponaria officinalis L.) Extracts Depend on the Plant Organ?

Góral

Jurek

Wojciechowski

2018

J Surfact & Detergents

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Soapwort (Saponaria officinalis, L) extracts from different plant organs (roots/rhizomes, stems, leaves, and flowers/fruits) were tested because of their ability to lower surface tension at the water/air interface and because of their foaming ability. In addition, surface dilational rheology of the adsorbed layers was assessed. The plant material was collected from May to October 2016 to enable analysis of temporal changes in surface activity of the extracts throughout the same vegetation period. Each organ sample at the given development stage was extracted both fresh (immediately after collecting) and after air drying, to compare the effect of postharvest treatment on surface activity of the extracts. The results show that the latter depends strongly on the development stage, the plant organ, and even the postharvest treatment. During the plant lifecycle, the surface activity of extracts from individual organs varies, probably following the saponin content alterations related to their production and storage for the next season.

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Section: Discussioncontrasting

confidence: 78%

Section: Discussioncontrasting

confidence: 78%

How Does the Surface Activity of Soapwort (Saponaria officinalis L.) Extracts Depend on the Plant Organ?

Góral

Jurek

Wojciechowski

2018

J Surfact & Detergents

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“…To clarify the origin of various effects observed for saponin-containing systems and to optimize the applications of the latter, better understanding is needed for the relationship between the molecular structure, on the one hand, and the structure and properties of their micellar aggregates and adsorption layers, on the other hand [12,13]. Such an understanding can be significantly improved using the method of molecular dynamics (MD).…”

Section: Introductionmentioning

confidence: 99%

“…This compound is also a surfactant with some unusual adsorption characteristics. Escin adsorption layers feature extremely high surface elastic modulus and very low gas permittivity, which is important for the properties of foams and emulsions stabilized by this natural surfactant [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…These properties are sensitive to the pH of the water phase, because the sugar residue, attached to the aglycone, contains an ionizable carboxyl group, see Figure 1. For example, the surface elasticity decreases significantly upon pH increase, i.e., the adsorption layer formed from ionized escin molecules is less elastic than that composed of neutral ones [12]. The origin of this unusual surface behavior has not been clarified at the molecular level.…”

Section: Introductionmentioning

confidence: 99%

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Self-Assembly of Escin Molecules at the Air–Water Interface as Studied by Molecular Dynamics

2017

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Escin belongs to a large class of natural biosurfactants, called saponins, that are present in more than 500 plant species. Saponins are applied in the pharmaceutical, cosmetics, and food and beverage industries due to their variously expressed bioactivity and surface activity. In particular, escin adsorption layers at the air-water interface exhibit an unusually high surface elastic modulus (>1100 mN/m) and a high surface viscosity (ca. 130 N·s/m). The molecular origin of these unusual surface rheological properties is still unclear. We performed classical atomistic dynamics simulations of adsorbed neutral and ionized escin molecules to clarify their orientation and interactions on the water surface. The orientation and position of the escin molecules with respect to the interface, the intermolecular interactions, and the kinetics of molecular aggregation into surface clusters are characterized in detail. Significant differences in the behavior of the neutral and the charged escin molecules are observed. The neutral escin rapidly assembles in a compact and stable surface cluster. This process is explained by the action of long-range attraction between the hydrophobic aglycones, combined with intermediate dipole-dipole attraction and short-range hydrogen bonds between the sugar residues in escin molecules. The same interactions are expected to control the viscoelastic properties of escin adsorption layers.

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Development of structured W/O emulsions with the use of only candelilla wax

de la Peña‐Gil,

Charo‐Alonso,

Toro‐Vazquez

2023

J Americ Oil Chem Soc

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We investigated the development of water‐in‐oil (W/O) emulsions using only candelilla wax (CW), evaluating the effects of different water to CW oleogel ratios (40:60, 50:50, 60:40) and the CW concentration (0.75% to 3%). The emulsions were developed by shearing the systems with an ultra‐turrax type homogenizer (60 s at 25°C) at the different water to CW oleogel ratios. After 0 and 20 days of storage (25°C) the emulsions were evaluated through microscopy, rheology, water droplet diameter, emulsion stability, and x‐ray diffraction measurements. The results showed that at all water to CW oleogel ratios the surface‐active components of the CW (i.e., triterpenic alcohols, aliphatic alcohols, and fatty acids) stabilized the oil–water interface, while the n‐alkanes and long chain esters formed an oleogel in the oil phase. Independent of the storage time, all the CW emulsions showed frequency independent rheological behavior. However, after applying a strain within the plastic region the 40:60 and 50:50 emulsions formulated with 1.5% to 3% CW provided the higher elasticity and emulsion stability, even after two freeze‐thaw cycles. In particular, the 40:60 and 50:50 emulsions with 1.5% CW had a recovery profile similar to commercial mayonnaise. In contrast, independent of the CW concentration, the 60:40 emulsions showed the lowest recovery profile and highest emulsion instability. These results showed the CW as a multifunctional material capable to develop structured W/O emulsions at room temperature without adding surfactants. The structured W/O emulsions developed by CW could be useful in the formulation of trans‐free, stable low‐fat edible spreads.

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Surface properties of adsorption layers formed from triterpenoid and steroid saponins

Cited by 69 publications

References 33 publications

How Does the Surface Activity of Soapwort (Saponaria officinalis L.) Extracts Depend on the Plant Organ?

How Does the Surface Activity of Soapwort (Saponaria officinalis L.) Extracts Depend on the Plant Organ?

Self-Assembly of Escin Molecules at the Air–Water Interface as Studied by Molecular Dynamics

Development of structured W/O emulsions with the use of only candelilla wax

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