Biotechnological routes towards bio-based surfactants : state of the art and future challenges / Ulrich Schörken in SOFW JOURNAL, Vol. 143, N° 5 (05/2017)  

[article]  inSOFW JOURNAL > Vol. 143, N° 5 (05/2017) . - p. 18-30 Titre : Biotechnological routes towards bio-based surfactants : state of the art and future challenges Type de document : texte imprimé Auteurs : Ulrich Schörken, Auteur ; Stéphan Barbe, Auteur ; Thomas Hahn, Auteur ; Susanne Zibek, Auteur Année de publication : 2017 Article en page(s) : p. 18-30 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biocatalyse Biosurfactants Biotechnologie Chimie écologique Composés organiques -- Synthèse Lipides Microbiologie industrielle Index. décimale : 668.5 Parfums et cosmétiques Résumé : Bio-based surfactants and biosurfactants on the basis of renewable resources are green alternatives for the cosmetic and detergent industry. Consumer trends towards sustainability and the need for CO2, reduction to achieve future climate goals wifl certainly increase interest in these bio-based products. Opportunities for biotechnological production by Combining naturally derived polar head groups with a lipid tail are manifold. In combination with appropriate reaction engineering immobilized hydrolases can be exploited for surfactant synthesis. In their reverse reactions, glycosidases are able to form glyosidic bonds, aùinoacylases were shown to catalyze amide bond formation and several lipases synthesize sugar esters in solvent systems under nearly water free conditions. The microbial synthesis of natural biosurfactants widens the spectrum of accessible molecules and several species of bacteria and fungi were shown to secrete amphiphilic molecules not easily accessible by chemical synthesis. The fermentative production of lipopeptides and glycolipids is feasible in large scale, and several of these microbial biosurfactants have been commercialized already for specialties application. Thus, biocatalytic processes and microbial biotransformations utilizing renewable resources add new sustainable technologies and new bio-based molecules to the surfactant market. The review, including some own results, is a summary of the 2016 EDC congress lectures "Assessment of biotechnological processes towards bio-based surfactants" and "Microbial synthesis of mannosylerythritol- and cellobioselipids" Note de contenu : - INTRODUCTION TO BIO-BASED SURFACTANTS : MARKET, STRUCTURES AND CHEMICAL MANUFACTURING OF BENCHMARK COMPOUNDS - BIOCATALYTIC SYNTHESIS OF BIO-BASED SURFACTANTS IN REVERSE HYDROLYSIS REACTIONS : Alkyl glycosides bia glycosidase reactions - Biocatalysts for acylamino acid coupling - Lipase catalyzed sugar ester synthesis - MICROBIAL PRODUCTION OF BIOSURFACTANTS : Celliobiose lipids - Mannosylerythritol lipids - Rhamnolipids - Sophorolipids - FUTURE CHALLENGES AND RESEARCH NEEDS : Bio-based surfactants via biocatalysis - Microbial surfactants En ligne : https://drive.google.com/file/d/1dYHM82RcLFh9Z6aiXDPQuFW8L39GoQly/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28683 [article]

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Mannosylerythritol and cellobiose lipids - Versatile biosurfactants / Thomas Hahn in SOFW JOURNAL, Vol. 143, N° 1-2 (01-02/2017)  

[article]  inSOFW JOURNAL > Vol. 143, N° 1-2 (01-02/2017) . - p. 18-23 Titre : Mannosylerythritol and cellobiose lipids - Versatile biosurfactants Type de document : texte imprimé Auteurs : Thomas Hahn, Auteur ; Fabian Haitz, Auteur ; Nancy Schäper, Auteur ; Paula Carrillo-Riveros, Auteur ; Michael Günther, Auteur ; Susanne Zibek, Auteur Année de publication : 2017 Article en page(s) : p. 18-23 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biosurfactants Cellobiose Le cellobiose est le produit de la dégradation de la cellulose. Mannosylérythritol Index. décimale : 668.5 Parfums et cosmétiques Résumé : Mannosylerythritol and cellobiose lipids are biosurfactants produced by microorganisms from renewable resources as plant oils or sugars. Both are known as promising biosurfactants for the use in cosmetics or in cleaning and laundry agents. One of the greatest strengths of microbially produced biosurfactants in their structural variety. Different mannosylerythritol lipid structures could be produced by variation of Pseudozyma strains in combination with different plant oils tuning their properties towards the required application. Furthermore, post-processing methods with enzymes or alkaline treatment were shown to be applied successfully e.g. to increase hydrophilicity of mannosylerythritol and cellobiose lipids resulting in a widening of the application fields. Potential applications of both biosurfactants are reasoned on their auspicious properties in application-specific investigations. In contrast to these findings, the number of commercial products is yet marginal. Note de contenu : - MOLECULE STRUCTURE OF MANNOSYLERYTHRITOL AND CELLOBIOSE LIPIDS - VARIATION OF MANNOSYLERYTHRITOL LIPIDS : MEL pattern variation by the use of different microorganisms - MEL pattern variation by the use of different plant oils - Enzymatic modification of the MEL structures - CELLOBIOSE LIPIDS : Enzymatic modification and alkaline treatment of CLs - PROPERTIES AND POTENTIAL APPLICATIONS FOR MEL AND CL En ligne : https://drive.google.com/file/d/1HsFnb9916GHLNnpX7iWWmRux6f2VLqaJ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28132 [article]

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