Current and Future Applications of Bacterial Extracellular Polysaccharides

Rheology and bioactivity of high molecular weight dextrans synthesised by lactic acid bacteria

“…mesenteroides strains are dextran with the structure depicted in Fig. 1C, very similar to that of the dextrans produced by MN1 Previous analysis of the dextran from MN1 and RTF1 by 2D-DOSY revealed that they possess a molecular mass higher than that of the commercial T2000 dextran which has a theoretical molecular mass of 2.0 x 10 6 Da (Nácher-Vázquez et al, 2015). Thus, to get a more precise estimation of the molecular mass of the five dextrans they were subjected to a SEC-MALLS analysis.…”

“…They can also produce iron dextrans, which are used in solution for treatment of human and veterinary anaemic deficiency. In addition, dextran sulphate has also shown an antiviral effect against the human immunodeficiency virus (Piret et al, 2000), and we have recently demonstrated that dextrans synthesized by LAB have potential as antivirals and immunomodulatory agents in trout (Nácher-Vázquez et al, 2015). Thus, dextrans can be used in the future for the manufacture of functional food and feed.…”

“…mesenteroides RTF10 and Lb. sakei MN1 isolated from Spanish fermented meat (Notararigo et al, 2013;Nácher-Vázquez et al, 2015;Nácher-Vázquez et al, 2017). LAB were grown in CDM defined medium instead of a rich medium in order to avoid, or diminish, the co-precipitation of interfering compounds during EPS quantification and further purification (Montersino, Prieto, Muñoz, & Rivas, 2008;Notararigo et al, 2013).…”

“…The HoPS can be -D-glucans, -D-glucans or -D-fructans and they are respectively synthesized by glucansucrases, glycosyltransferases or fructansucrases (Werning et al 2012;Pérez-Ramos et al 2015). HoPS are able to modulate rheological properties of materials (Welman & Maddox, 2003), and several studies have shown that they can replace or reduce the use of more expensive hydrocolloids and could find applications such as texturizing agents (Bounaix et al, 2009).…”

“…Dextrans of high molecular mass are used for petroleum recovery; those of average molecular masses are employed in the chemical industry; whereas low-molecular mass dextrans find applications in the pharmaceutical and photographic industries (Vettori, Blanco, Cortezi, de Lima, & Contiero, 2012). In cosmetics, they are used as moisturizers and thickeners (Vu, Chen, Crawford, & Ivanova, 2009), and in the food industry, they are added to bakery products and confectionery to improve softness or moisture retention, to prevent crystallisation, and to increase viscosity, rheology, texture and volume (Pérez-Ramos et al, 2015). These HoPS also play an important role in stabilisation of frozen foods and can be used as films, to preserve the surface of fish, meat, vegetables or cheese from oxidation and other chemical changes (Harutoshi, 2013).…”