胆盐在空气-水和油水界面的吸附与解吸

IF 2.5 Q3 CHEMISTRY, PHYSICAL Colloids and Interfaces Pub Date : 2023-04-11 DOI:10.3390/colloids7020031
T. del Castillo-Santaella, J. Maldonado-Valderrama
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引用次数: 0

摘要

胆汁盐(BS)吸附在乳化的油滴上,促进脂解,然后解吸,溶解脂解产物,这一过程在脂质消化中起着至关重要的作用。因此,研究BS在油水界面上的吸附和解吸机制对于理解和控制BS的功能具有重要意义。这可能会对具有定制消化率的产品的合理设计产生影响。本研究显示了通过悬滴张力计获得的BS在空气-水和油-水界面的吸附和解吸曲线。选择了三种具有不同共轭和羟基的BS:牛磺酸钠(NaTC)、甘脱氧胆酸盐(NaGDC)和甘脱氧胆酸钠(NaGCDC)。实验结果表明,BS的类型和界面(空气/油-水)的性质之间存在重要差异。在空气-水界面,甘氨酸缀合物(NaGDC和NaGCDC)比牛磺酸(NaTC)更具表面活性,并且它们还显示出较低的饱和膜表面张力。甘氨酸偶联物中羟基的位置可能有利于BS在表面的更垂直的取向和改进的横向堆积。由于BS与油的疏水相互作用,阻止了分子间缔合,这些差异在油水界面减少。解吸研究表明,在所有情况下,油水界面都存在不可逆吸附层,而在空气-水界面,吸附的可逆性在很大程度上取决于BS的类型。最后,膨胀流变学表明,BS的膨胀响应再次受到BS与油的疏水相互作用的影响;因此,不同BS在油水界面上的吸附膜非常相似,而在空气-水界面上吸附的BS之间出现了更大的差异。本文的结果突出了BS在油-水界面上的吸附层特征的新特征,与BS在空气-水界面吸附的特征相比,这些特征与脂质消化更相关。
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Adsorption and Desorption of Bile Salts at Air–Water and Oil–Water Interfaces
Bile Salts (BS) adsorb onto emulsified oil droplets to promote lipolysis and then desorb, solubilizing lipolytic products, a process which plays a crucial role in lipid digestion. Hence, investigating the mechanism of adsorption and desorption of BS onto the oil–water interface is of major importance to understand and control BS functionality. This can have implications in the rational design of products with tailored digestibility. This study shows the adsorption and desorption curves of BS at air–water and oil–water interfaces obtained by pendant drop tensiometry. Three BS have been chosen with different conjugation and hydroxyl groups: Sodium Taurocholate (NaTC), Glycodeoxycholate (NaGDC) and Sodium Glycochenodeoxycholate (NaGCDC). Experimental results show important differences between the type of BS and the nature of the interface (air/oil–water). At the air–water interface, Glycine conjugates (NaGDC and NaGCDC) are more surface active than Taurine (NaTC), and they also display lower surface tension of saturated films. The position of hydroxyl groups in Glycine conjugates, possibly favors a more vertical orientation of BS at the surface and an improved lateral packing. These differences diminish at the oil–water interface owing to hydrophobic interactions of BS with the oil, preventing intermolecular associations. Desorption studies reveal the presence of irreversibly adsorbed layers at the oil–water interface in all cases, while at the air–water interface, the reversibility of adsorption depends strongly on the type of BS. Finally, dilatational rheology shows that the dilatational response of BS is again influenced by hydrophobic interactions of BS with the oil; thus, adsorbed films of different BS at the oil–water interface are very similar, while larger differences arise between BS adsorbed at the air–water interface. Results presented here highlight new features of the characteristics of adsorption layers of BS on the oil–water interface, which are more relevant to lipid digestion than characteristics of BS adsorbed at air–water interfaces.
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来源期刊
Colloids and Interfaces
Colloids and Interfaces CHEMISTRY, PHYSICAL-
CiteScore
3.90
自引率
4.20%
发文量
64
审稿时长
10 weeks
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