Stability of folic acid in the presence of other water soluble vitamins

The stability of folic acid in water at pH 7.5 was studied in the presence of other vitamins such as ascorbic acid, pyridoxine hydrochloride, riboflavin and thiamine hydrochloride. The two component mixtures contained 1:1 folic acid and another vitamin and concentration of each outs 0.002%. Sunlight, heat and oxygen have adverse effects on the stability of such preparations. The half and self lives of folic acid in the preparations were calculated