Crack patterns induced by auto-stratification in drying sessile droplets of dairy proteins

IF 5.4 2区医学 Q1 BIOPHYSICS

Colloids and Surfaces B: Biointerfaces Pub Date : 2025-05-07 DOI:10.1016/j.colsurfb.2025.114761

C. Le Floch-Fouéré , M. Yu , F. Boissel , R. Jeantet , L. Pauchard , L. Lanotte

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引用次数: 0

Abstract

Exploring the interfacial mechanisms involved in the evaporation of colloidal solutions is currently an open question with potential biomedical and industrial applications. In biological systems, unraveling evidence of self-arrangement is even more challenging due to the different size, structure and charge of their multi-components. In this work, we study the evaporation dynamics in mixes of dairy proteins, i.e., whey proteins and casein micelles. Combining the observation of crack formation in drying droplets and the evaluation of the elastic response in films during the evaporation, we highlight interfacial stratification resulting in the external accumulation of whey proteins. We also relate such preferential segregation to the mechanical properties of the dry matrices, showing that whey protein overrepresentation confers a brittle behavior to the mixes. These experimental results enable the development of a first predictive model of the elastic modulus for biocolloid binary mixes, taking into account their deformability and different ratio in the samples. Unraveling the link between colloid self-arrangement and the evolution of skin properties during the evaporation is a first step towards controlling structure and use properties of the dry particles composing dairy powders.

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乳蛋白固结液滴干燥过程中自分层诱导的裂纹模式

探索胶体溶液蒸发的界面机制目前是一个具有潜在生物医学和工业应用的开放性问题。在生物系统中，由于其多组分的大小、结构和电荷不同，揭示自排列的证据更具挑战性。在这项工作中，我们研究了乳蛋白混合物中的蒸发动力学，即乳清蛋白和酪蛋白胶束。结合对干燥液滴裂纹形成的观察和薄膜在蒸发过程中弹性响应的评估，我们强调了导致乳清蛋白外部积累的界面分层。我们还将这种优先分离与干基质的机械性能联系起来，表明乳清蛋白的过度代表赋予混合物脆性行为。这些实验结果使我们能够建立第一个生物胶体二元混合物弹性模量的预测模型，该模型考虑了它们的可变形性和样品中的不同比例。揭示胶体自排列与蒸发过程中皮肤特性演变之间的联系是控制构成乳粉的干燥颗粒的结构和使用特性的第一步。

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来源期刊

Colloids and Surfaces B: Biointerfaces 生物-材料科学：生物材料

CiteScore

11.10

自引率

3.40%

发文量

730

审稿时长

42 days

期刊介绍： Colloids and Surfaces B: Biointerfaces is an international journal devoted to fundamental and applied research on colloid and interfacial phenomena in relation to systems of biological origin, having particular relevance to the medical, pharmaceutical, biotechnological, food and cosmetic fields. Submissions that: (1) deal solely with biological phenomena and do not describe the physico-chemical or colloid-chemical background and/or mechanism of the phenomena, and (2) deal solely with colloid/interfacial phenomena and do not have appropriate biological content or relevance, are outside the scope of the journal and will not be considered for publication. The journal publishes regular research papers, reviews, short communications and invited perspective articles, called BioInterface Perspectives. The BioInterface Perspective provide researchers the opportunity to review their own work, as well as provide insight into the work of others that inspired and influenced the author. Regular articles should have a maximum total length of 6,000 words. In addition, a (combined) maximum of 8 normal-sized figures and/or tables is allowed (so for instance 3 tables and 5 figures). For multiple-panel figures each set of two panels equates to one figure. Short communications should not exceed half of the above. It is required to give on the article cover page a short statistical summary of the article listing the total number of words and tables/figures.