Nicotinamide. Polarised light micrograph of crystals of nicotinamide,or niacinamide. This is the amide of nicotinic acid. The acid and amide are both B vitamins,and are equally active. Nicotinamide is a component of two vital coenzymes,NAD (nicotinamide adenine dinucleotide) and its phosphate NADP,which are responsible for electron transport in cellular respiration. A deficiency of these and other B vitamins may lead to pellagra,shown by severe dermatitis,diarrhoea and depression. Sources of niacinamide include vegetables,lean meat,milk and some cereals (but not maize). Magnification x16 at 6x7cm size. Magnification: x27 at 5x4 inch size | |
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