Sodium alginate hygroscopic, and contained in the equilibrium amount of water depends on the relative humidity. The dried alginate in a well sealed container at 25 ° C and below the temperature storage quite stable. The alginate solution stability at pH5 ~ 9. Degree of polymerization (DP) and the molecular weight and the viscosity of the alginate solution is directly related to the viscosity reduction during storage can be used to measure the sodium alginate to the degree of polymerization.The high degree of polymerization less Sodium alginate stability than the low degree of sodium alginate. Reportedly alginate by proton catalyzed hydrolysis, the hydrolysis depends on time, pH and temperature. Propylene glycol alginate solution at room temperature, pH3 to 4 pm stability; pH of less than 2 or greater than 6:00, the viscosity even at room temperature will soon be reduced.
The concentration of sodium alginate, glycerol concentration and cinnamon oils, dry temperature and time are determined according to mechanical properties and antibacterial properties of the film.
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