Fig. 2

DLS diagram of a NN in the optimum percentage, b FN in the optimum percentage, c NN after 30 days at 24 °C, d NN after 30 days at 4 °C, e NN after 30 days at − 4 °C, f NN after 30 days at − 20 °C, g FN after 30 days at 24 °C, h FN after 30 days at 4 °C, i FN after 30 days at − 4 °C, j FN after 30 days at − 20 °C, k NN after 90 days at 24 °C, l NE after 90 days at 24 °C, m NN after freeze-drying, and n FN after freeze-drying