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2009_Book_FoodChemistry

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230 3 Lipids

Fig. 3.42. Photochemical conversions of provitamin D 3

ring D and the side chain) show these differences

(Formulas 3.104–3.107):

(3.104)

Stigmasterol (double bond at C-22) (3.106)

β-Sitosterol (24-α-ethyl-cholesterol) (3.105)

Campesterol (24-α-methyl-cholesterol) (3.107)

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