purification

Reuse of a purified solution of cetyltrimethylammonium bromide for the synthesis of gold nanorods

Authors: Gudova Y. D., Kochubey V. I., Skaptsov A. A.

We investigate the possibility of reusing CTAB solutions for repeated synthesis of gold nanorods. Three tasks have been solved. The first task is to clean the growth solutions from gold nanorods. The second task is to develop a method using a purified cetyltrimethylammonium bromide solution for repeated synthesis of gold nanorods with the same optical properties as in the initial synthesis. The third task is to test the possibility of management of the optical properties of nanorods during repeated synthesis.

The Influence of Culture Conditions on Production of Exopolysaccharide of Streptococcus Thermophilus

Authors: Fokina N. A., Uryadova G. T., Karpunina L. V.

Isolated exopolysaccharide Streptococcus thermophilus. The conditions for the cultivation of bacteria for the maximum yield of the exopolysaccharide were selected. The bacterial culture of S. thermophilus was incubated for 48 hours in a liquid nutrient medium A. Welman at 38 °C, 180 rpm. on a thermostated shaker-incubator. As a source of carbon were used: sucrose, lactose and glucose. For the production of exopolysaccharide, the best source of carbon was sucrose. Isolation of the exopolysaccharide was carried out according to the J. Cerning method in our modification.