{"title":"Glycation influencing lubrication: Tribology principles derived from nature to inspire future food colloid design","authors":"Anwesha Sarkar , Khalid Gul","doi":"10.1016/j.cocis.2023.101782","DOIUrl":"10.1016/j.cocis.2023.101782","url":null,"abstract":"<div><p>Glycation, <em>i.e.</em>, the covalent reaction between reactive carbonyl groups of sugar with biomolecules such as protein, lipid, or DNA, is integral to many physiological functions, including biolubrication. Although glycation, also commonly termed as “Maillard reaction”, has been used extensively to modify flavors and stabilize food colloids, its applications for achieving desired oral lubrication performance of food are in its infancy. This review discusses glycation as a biolubrication tool to provide stimulus to future designing of food colloids. Specifically, we examine how glycation drives biolubrication of soft tissues with examples of lubricin and mucin as “brush-like”, nature-engineered, high performance, aqueous lubricants. Recent advances in Maillard conjugation to modify tribology, rheology, adsorption, or surface hydrophobicity of dietary proteins are covered. Lastly, we transfer molecular rules from polymer physics to food colloid science to inspire repurposing glycation of dietary proteins to rationally design the next-generation of lubricious alternative protein-based foods that are often delubricating.</p></div>","PeriodicalId":293,"journal":{"name":"Current Opinion in Colloid & Interface Science","volume":"69 ","pages":"Article 101782"},"PeriodicalIF":8.9,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1359029423001073/pdfft?md5=29f21841f17655ef44ae9b4bd98f5e3a&pid=1-s2.0-S1359029423001073-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138556076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Mechanical properties and microstructure of (emul)gels formed by mixtures of proteins and polysaccharides","authors":"Christophe Chassenieux, Taco Nicolai","doi":"10.1016/j.cocis.2023.101781","DOIUrl":"10.1016/j.cocis.2023.101781","url":null,"abstract":"<div><p>It is now well established that the combination of proteins and polysaccharides<span><span><span> makes it possible to obtain textures that can be used by the food industry. However, consumer demand for more environmentally friendly and healthier foods is leading to the development of new ingredients (particularly plant proteins) for which the know-how acquired on animal proteins cannot be directly transposed. The aim of this review is to take stock of the work published between 2021 and 2023 on gelation of polysaccharide/protein mixtures on their own or in the presence of oil. The emphasis is on the structural and rheological studies of these (emul)gels. In addition to the </span>composition and variability of the ingredients, there are a multitude of formulation parameters (pH, salt, temperature, etc.) and shaping parameters (pressure, </span>homogenisation, etc.), which makes it difficult to compare the different studies in order to conclude on general structure/properties relationships.</span></p></div>","PeriodicalId":293,"journal":{"name":"Current Opinion in Colloid & Interface Science","volume":"70 ","pages":"Article 101781"},"PeriodicalIF":8.9,"publicationDate":"2023-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138556188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Eduardo Guzmán , Francisco Ortega , Ramón G. Rubio
{"title":"Exploring the world of rhamnolipids: A critical review of their production, interfacial properties, and potential application","authors":"Eduardo Guzmán , Francisco Ortega , Ramón G. Rubio","doi":"10.1016/j.cocis.2023.101780","DOIUrl":"10.1016/j.cocis.2023.101780","url":null,"abstract":"<div><p><span>Rhamnolipids are very promising sugar-based biosurfactants, generally produced by bacteria, with a wide range of properties that can be exploited at an industrial and technological level, e.g. in cosmetics, food science, or oil recovery, to provide benefits for human health and the environment. This has led to intensive research into optimizing their production to increase yields and minimize costs, which is challenging because biotechnological methods for rhamnolipid production result in complex product mixtures and require the introduction of complex separation strategies to ensure the purity of the rhamnolipid obtained. This is an important issue for the introduction of rhamnolipids to the market due to the differences that exist between the properties of the different congeners. This review attempts to provide an overview of the </span>interfacial properties, potential applications, and recent advances in understanding the molecular mechanisms that govern the adsorption to interfaces and assembly in solution of rhamnolipids. In addition, the review also discusses some general aspects related to the production and purification methods of rhamnolipids, highlighting the need for further research to fully exploit their potential. It is hoped that this review will contribute to the growing body of knowledge about rhamnolipids and stimulate further research in this field.</p></div>","PeriodicalId":293,"journal":{"name":"Current Opinion in Colloid & Interface Science","volume":"69 ","pages":"Article 101780"},"PeriodicalIF":8.9,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138536644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Liquid crystalline behavior of concentrated aqueous solutions of biosurfactants","authors":"Patrick Davidson","doi":"10.1016/j.cocis.2023.101777","DOIUrl":"10.1016/j.cocis.2023.101777","url":null,"abstract":"<div><p><span>In the current global context of the search for renewable resources, bioamphiphiles appear as a promising alternative to conventional oil-based surfactants. However, to commercialize these compounds, all their structural and physical properties should be known. Although their self-assembly and </span>interfacial properties at low concentrations are currently an active research topic, their self-organization into liquid crystalline (LC) phases at high concentrations has yet hardly been addressed. This article reviews the few studies devoted to the identification of LC properties of bioamphiphiles. It highlights the fact that only two bioamphiphile families (mannosylerythritol lipids, sophorolipids) have been investigated in some detail and that much more structural and thermodynamic knowledge is still needed to reach the level of understanding achieved with conventional surfactants.</p></div>","PeriodicalId":293,"journal":{"name":"Current Opinion in Colloid & Interface Science","volume":"69 ","pages":"Article 101777"},"PeriodicalIF":8.9,"publicationDate":"2023-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138536625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ramsia Geisler , Mohammad A. Hormozi , Regine von Klitzing
{"title":"Unveiling the nanoscale world: Exploring surface tension measurements with atomic force nanoindenters","authors":"Ramsia Geisler , Mohammad A. Hormozi , Regine von Klitzing","doi":"10.1016/j.cocis.2023.101769","DOIUrl":"10.1016/j.cocis.2023.101769","url":null,"abstract":"<div><p>This review summarises state-of-the-art AFM<span> experiments measuring surface tension in various liquid systems with cylinder shaped AFM probes (nanoindenters). AFM has emerged as a powerful technique, offering precise force measurements and advantages such as reduced sample contamination, analysis of small sample amounts, and access to nanoscale features such as the measurement of the single particle surface tension. These contribute to advancing our understanding of liquid systems and interfacial phenomena. However, the limited number of published studies may be attributed to challenges in AFM-based measurements using the micro-Wilhelmy method or the complexity of the perceived importance of surface tension research. Further investigation is needed to elucidate these factors. In recent years, the possibilities for producing nanoindenters have become increasingly precise which gives a new momentum to the AFM technique to measure surface tensions on a micro and nanoscale.</span></p></div>","PeriodicalId":293,"journal":{"name":"Current Opinion in Colloid & Interface Science","volume":"69 ","pages":"Article 101769"},"PeriodicalIF":8.9,"publicationDate":"2023-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138536624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xiaoyi Jiang , Kathryn A. Whitehead , Nils Arneborg , Yong Fang , Jens Risbo
{"title":"Understanding bacterial surface and adhesion properties and the implications for Pickering stabilization of colloidal structures","authors":"Xiaoyi Jiang , Kathryn A. Whitehead , Nils Arneborg , Yong Fang , Jens Risbo","doi":"10.1016/j.cocis.2023.101767","DOIUrl":"10.1016/j.cocis.2023.101767","url":null,"abstract":"<div><p><span>Gram-positive bacteria can be considered as structural building blocks adhering to interfaces and taking part in the formation of colloidal structures depending on their surface chemistry and properties. The chemical composition and spatial conformation of the Gram-positive bacterial cell wall, particularly of the species </span><em>Lactobacillus</em><span><span><span>, determine their surface properties and adhesion behaviors. One application of bacterial adhesion can be the stabilization of colloidal structures via a Pickering mechanism. The natural composition of Gram-positive bacteria renders abundant hydrophilic surface </span>polysaccharides due to the presence of a thick </span>peptidoglycan layer, making it unfavorable for their adsorption at interfaces, however, this property provides sufficient binding sites to allow surface modification. Understanding the fundamental physicochemical forces governing bacterial adhesion helps to reveal their potential applications as Pickering particles. The novelty of this work is that this review summarizes the major non-specific interactions occurring between bacteria approaching a surface, the commonalities and differences of bacteria to Pickering particles, and how a series of simple and advanced colloidal structures can be stabilized by natural and surface-modified bacteria.</span></p></div>","PeriodicalId":293,"journal":{"name":"Current Opinion in Colloid & Interface Science","volume":"69 ","pages":"Article 101767"},"PeriodicalIF":8.9,"publicationDate":"2023-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138536643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The underlying order: Isomerism as a blueprint to control the behavior of sugar-based (bio)surfactants","authors":"Adrian Sanchez-Fernandez , Jia-Fei Poon","doi":"10.1016/j.cocis.2023.101768","DOIUrl":"10.1016/j.cocis.2023.101768","url":null,"abstract":"<div><p>Surfactants are ubiquitous in formulated products and technologies. As one of the most important commodity chemicals, their remarkable consumption leads to the necessity of finding sustainable alternatives. Although the use of renewable sources limits the available chemical space for a “Green” production, the great variety of naturally occurring precursors, i.e., fatty acids and sugars, opens a myriad of possibilities to create biosurfactants capable of replacing the fatigued fossil-derived amphiphiles. Here, we visit the concept of isomer-directed assembly applied to sugar-based surfactants, wherein amphiphile assembly and function are fine-tuned through changes in the stereochemical and regiochemical configuration of the molecule. As such, we show how isomerism defines directional interactions and solvation, ultimately dictating the assembly of surfactants. However, a general framework to understand the structure-function relationship for these is still missing, which is key to realizing this divergent set of tools for the design of new surfactants.</p></div>","PeriodicalId":293,"journal":{"name":"Current Opinion in Colloid & Interface Science","volume":"69 ","pages":"Article 101768"},"PeriodicalIF":8.9,"publicationDate":"2023-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1359029423000936/pdfft?md5=30a9b10052fed3f0e41db631e41ead25&pid=1-s2.0-S1359029423000936-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138536623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The adsorption and self-assembly of biosurfactants and biosurfactant / surfactant mixtures using neutron scattering techniques","authors":"Jeffrey Penfold , Robert K. Thomas","doi":"10.1016/j.cocis.2023.101766","DOIUrl":"10.1016/j.cocis.2023.101766","url":null,"abstract":"<div><p><span>The neutron and X-ray scattering techniques of small-angle scattering and reflectivity<span><span> are important tools for the characterisation of the key properties of surfactants<span>, their adsorption at interfaces, and their self-assembly in solution. The increasing trend towards biosustainable and biocompatible surfactant-based formulations highlights the increasing importance of understanding the properties of biosurfactants. This review focuses on some relatively recent contributions of the use of primarily </span></span>neutron scattering techniques to the understanding of surface adsorption and self-assembly of some specific microbial derived biosurfactants, rhamnolipids and </span></span>sophorolipids. The review also focuses on the behaviour of their mixtures with other surfactants and shows how a detailed thermodynamical analysis is possible from the scattering data.</p></div>","PeriodicalId":293,"journal":{"name":"Current Opinion in Colloid & Interface Science","volume":"68 ","pages":"Article 101766"},"PeriodicalIF":8.9,"publicationDate":"2023-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135455058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Multi-component phase behavior of biosurfactants","authors":"Janine Birnbach , Peter Schmiedel , Matthias Karg","doi":"10.1016/j.cocis.2023.101765","DOIUrl":"10.1016/j.cocis.2023.101765","url":null,"abstract":"<div><p>The public increasingly requests green formulations as a consequence of growing sustainability awareness. This may include glycolipid<span><span> and lipopeptide<span><span> biosurfactants (BS), which are considered renewable, biodegradable, and mild alternatives to conventional fossil-based </span>surfactants. For developing green formulations, it is crucial to understand the phase behavior and the resulting physico-chemical characteristics of systems with BS. This is not only necessary for binary systems of BS in water, which have already been frequently studied and reviewed. But it is also important to study combinations with other surfactants and oils due to their higher relevance for applications. For this reason, we review in this article the different types of phase behavior of systems comprising BS, in particular systems with rhamnolipid, </span></span>sophorolipid<span><span>, mannosylerythritol lipid, cellobiose lipid, and </span>surfactin.</span></span></p></div>","PeriodicalId":293,"journal":{"name":"Current Opinion in Colloid & Interface Science","volume":"68 ","pages":"Article 101765"},"PeriodicalIF":8.9,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136153513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Marcos López Hernández , Jan Skov Pedersen , Daniel E. Otzen
{"title":"Proteins and biosurfactants: Structures, functions, and recent applications","authors":"Marcos López Hernández , Jan Skov Pedersen , Daniel E. Otzen","doi":"10.1016/j.cocis.2023.101746","DOIUrl":"https://doi.org/10.1016/j.cocis.2023.101746","url":null,"abstract":"<div><p>Synergies between surfactants and proteins are found everywhere in everyday life. Beneficial interactions are exploited in fields such as food processing, pharmaceutical production, and laundry, leading to better products and lower energy consumption. Nevertheless, there is still room for improvement regarding sustainability. Here, biosurfactants (BS) are an attractive alternative to petrochemical surfactants. Insights into BS-protein interactions can help replacing traditional surfactants with BS and uncover new opportunities. Here, we review recent work on proteins' interactions with BS, with focus on the self-assembly of protein:BS complexes and BS’ effects on enzymatic activity. Generally, interactions are milder than those with traditional ionic surfactants, leading to modest effects on protein structure and self-assembly, while enzymatic inhibition is generally observed above BS' critical micelle concentration. Mild interactions between proteins and BS show promise in forming functional complexes with proteins, however, further studies are required to understand and minimize the detrimental effects that do occur.</p></div>","PeriodicalId":293,"journal":{"name":"Current Opinion in Colloid & Interface Science","volume":"68 ","pages":"Article 101746"},"PeriodicalIF":8.9,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1359029423000717/pdfft?md5=2e02444c749f52c0c1e08337cc23b1a7&pid=1-s2.0-S1359029423000717-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92039987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}