Phosphorus content was determined by a method modified from standard methods described in the AOAC,1984.Sodium carbonate (1.5 g) was dissolved in 5 ml of distilled water in crucible. 2.5 g of sample was added and mixed well. The mixture was boiled until dryness and did not provide any fume. Ignite it at 550 12 h in the furnace. The finished product was cooled to room temperature and 2 ml of 25% conc. HCI with 10 ml of distilled water were added. The solution was transferred to beaker contained 20 ml distilled water and made up the volume to 50 ml by adding distilled water. Mix well then filter through glass funnel with filter paper NO.1. The solution was again diluted into 250 ml by the addition of distilled water in the volumetric flask.Pipette 10 ml of diluted solution and mixed well with 2 ml of vanadate-molybdate reagent and left the solution at the room temperature for 45 min. Measure the absorbance of the sample at 435 nm with a spectrophotometer model Beckman, DU65. The phosphorus content was obtained from the standard curve. The DS of mono and distarch phosphates are calculated as follows (Wongsagonsup,Shobsngob,Oonkhanond, and Varavinit, 2005):