The Vitamin B Complex and Ascorbic Acid

نویسندگان

  • Robert Marcus
  • Ann M. Coulston
چکیده

This chapter provides a summary of physiological and therapeutic roles of members of the vitamin B complex and of vitamin C. The vitamin B complex comprises a large number of compounds that differ extensively in chemical structure and biological action. They were grouped in a single class because they originally were isolated from the same sources, notably liver and yeast. There are traditionally eleven members of the vitamin B complex— namely, thiamine, riboflavin, nicotinic acid, pyridoxine, pantothenic acid, biotin, folic acid, cyanocobalamin, choline, inositol, and paraaminobenzoic acid. Paraaminobenzoic acid is not considered in this chapter, as it is not a true vitamin for any mammalian species but is a growth factor for certain bacteria, where it is a precursor for folic acid synthesis. Although not a traditional member of the group, carnitine also is considered in this chapter because of its biosynthetic relationship to choline and the recent recognition of deficiency states. Folic acid and cyanocobalamin are considered in Chapter 54 because of their special function in hematopoiesis. Vitamin C is especially concentrated in citrus fruits and thus is obtained mostly from sources differing from those of members of the vitamin B complex.

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تاریخ انتشار 2007