Thus the overall retention from the initially added vitamin B1 is about 0.762*0.899=0.685 or 68.5% for white rice,58.5% for parboiled rice and 54.3% for brown rice,which is a rather high retention efficiency.Vitamins B1,B3,B5 and B6 seemsed to have a higher retention after cooking using spraying method, while using soaking method all vitamins (Except B12 using excess of cooking water) appeared a retention after cooking over 75%.