Explain the Occurrence of Vitamin B1
Vitamin B1 occurs widely in the vegetable kingdom. The richest sources for vitamin B1, as you may already know, are yeast, grain germs and rice polish. Whole grain bread and potatoes are vitamin B1 sources of considerable dietary importance. Animal tissues rich in vitamin B1 are liver, kidney, brain and heart. Aqueous solutions of thiamine hydrochloride are unstable in the presence of alkalis and substances with alkaline reactions, atmospheric oxygen, metal ions and UV light. Moreover, the solutions are affected by reducing and oxidizing agents, especially in the neutral and alkaline ranges.