Nicotinic acids are derivatives of pyridine which have a carboxy group.
Although the term niacin is sometimes used interchangeably with "nicotinic acid", it is more precise to only apply it to the 1-3 (meta) substituted form.
Nicotinic Acid is water soluble. This is quite important because it may be lost when you cook your food by boiling it in water! It is also important because it cannot be stored in the body and must therefore be present in your diet to replace that which is lost in urine. Don't worry about remembering the chemical structure for your "A" Level exams. It is more important for you to understand why a deficiency of this chemical causes pellagra.
Nicotinic acid is found in milk, yeast, eggs. Here is a table of average values for the Nicotinic Acid content of a variety of foods. I have always thought that the two at the bottom of the table were dead boring. (I prefer cream in my coffee.)
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Read more: Organic acids
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