quite a number of techniques available like storing at -20C for shorter duration. or at -40 or -80C for longer periods. even you can lyophilize your cultures, which can be stored for years with out affecting the cell activity... so you can choose the most feasible method as per your lab facilities.....
glycerol, sucrose and freezing helpful to increase the viability but stability of syrup liquid can not be handle with this solution. Can anyone help me to stabilize liquid syrup media.