0000000000095471
AUTHOR
Thanh Dat Nguyen
Protection of yeast cells in micro-organized shells of natural polyelectrolytes during drying process
The encapsulation techniques are applied in various fields and for various applications. The layer-by-layer self-assembly (LbL), one of the encapsulation techniques, is built by the electrostatic attraction between oppositely charged polyelectrolytes, and the topmost layer determines essentially the sur-face properties of the edifice. This technique offers several advantages (low cost, simplicity of process and equipment, biocompatibility and biodegra-dation, etc.). In this present paper, results of the protection of Saccharomyces cerevisiae yeast cells in microorganized shell of natural polyelectrolytes during dehydration process are reported. To apply the LbL method to individually encaps…
Protection of living yeast cells by micro-organized shells of natural polyelectrolytes
International audience; Saccharomyces cerevisiae, a eukaryotic model organism, plays a key role in the oxidative stability of fermented products. In order to protect cells against environmental stresses, we report a method of modifying the cell surface architecture while maintaining the internal working properties of the system. The objective was to encapsulate living yeast cells in micro-organized polyelectrolyte shells using layer-by-layer (LbL) assembly. For the first time, the natural polyelectrolytes, β-lactoglobulin and sodium alginate, were alternately deposited on the surface of S. cerevisiae. Transmission electron microscopy coupled with immune-cytochemistry and scanning electron m…
Environmentally eco-reasoned design process for functional yeast production and stabilization
Environmentally eco-reasoned design process for functional yeast production and stabilization. 3. European Congress of Applied Biotechnology (ECAB 3)
Partition of volatile compounds in pea globulin–maltodextrin aqueous two-phase system
International audience; This study is based on the assumption that the off-flavour of pea proteins might be decreased using the retention of volatile compounds by a mixture with another biopolymer. The partition of volatile compounds in an aqueous system containing pea protein and maltodextrins was followed under thermodynamic incompatibility conditions. Firstly, the phase diagram of the system was established. Then, the partition of aroma compounds between the phase rich in protein and the phase rich in maltodextrin was measured by SPME–GC–MS. There was a transfer of volatile compounds during phase separation. Variations of pH were also used to vary the retention of volatile compounds by p…
Design of new sensitive α,β-unsaturated carbonyl 1,8-naphtalimide fluorescent probes for thiol bioimaging
International audience; We report herein an efficient synthesis of news naphtalimide-based fluorescent derivatives functionalized with an a,(3-unsaturated carbonyl group. Probes were synthesized from reaction of an amino-naphtalimide precursor with maleic anhydride. Photophysical study of fluorescent probes and cells labelling were performed, and showed that the reactive derivatives exhibit rich turn on fluorescence properties in presence of different biological thiol (Glutathione and Cysteine) making these systems a very promising way for thiol bioimaging.
Protection of Saccharomyces cerevisiae by a layer-by-layer system : effect on yeast metabolic activity in response to environmental conditions
In order to protect the Saccharomyces cerevisiae yeast during dehydration, two strategies were used to improve cell survival. Strengthening cell resistance (internal protection) was performed by improving the concentration of intracellular glutathione in yeast. Encapsulation was performed by layer-by-layer method using two biopolymers β-lactoglobulin and alginate for the external protection of the yeast. The adequate medium culture and favorable growing conditions for glutathione enhancement were determined. The composition of the culture medium is rich in nutrients and glutathione precursors consisting in 30 g/L glucose, 30 g/L yeast extract, 0.6 g/L KH2PO4 and 0.6 g/L cysteine. The succes…
CCDC 1054357: Experimental Crystal Structure Determination
Related Article: Nicolas Sok, Maria Nikolantonaki, Stephane Guyot, Thanh Dat Nguyen, Anne-Sophie Viaux, Franck Bagala, Yoann Rousselin, Florence Husson, Régis Gougeon, Rémi Saurel|2017|Sens.Actuators,B|242|865|doi:10.1016/j.snb.2016.09.171
CCDC 1054356: Experimental Crystal Structure Determination
Related Article: Nicolas Sok, Maria Nikolantonaki, Stephane Guyot, Thanh Dat Nguyen, Anne-Sophie Viaux, Franck Bagala, Yoann Rousselin, Florence Husson, Régis Gougeon, Rémi Saurel|2017|Sens.Actuators,B|242|865|doi:10.1016/j.snb.2016.09.171