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intracellular membrane-bound organelles, as described in a later section of this chapter.

Spent yeast is used as a nutritional supplement because it is an excellent source of vitamins. Yeast does not contain vitamin C or the lipophilic types A and D. Nevertheless, other vitamins, particularly those of the B complex, are present in relative abundance (Table 4.4).

The gross macromolecular constitution of brewing yeast is much influenced by the genotype of the organism and the conditions to which it is exposed during the brewing process. The method of expressing the relative concentrations of individual cellular components requires careful interpretation. It is common practice to use yeast dry (or wet) weight as the denominator in expressions of macromolecular concentration.

Table 4.4 Vitamin content of brewers' yeast (from Eddy, 1958).

Vitamin |xg/g dry yeast

Table 4.4 Vitamin content of brewers' yeast (from Eddy, 1958).

Vitamin |xg/g dry yeast

P-aminobenzoic acid

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