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Food Lipids: Chemistry, Nutrition, and Biotechnology

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Figure 28 Structures of some vitamin A compounds.<br />

Table 8 Approximate Biological Activity<br />

Relationships of Vitamin A Compounds<br />

Compound<br />

All-trans retinol<br />

9-cis Retinol<br />

11-cis Retinol<br />

13-cis Retinol<br />

9,13-di-cis Retinol<br />

11,13-di-cis Retinol<br />

�-Carotene<br />

�-Carotene<br />

Copyright 2002 by Marcel Dekker, Inc. All Rights Reserved.<br />

Activity of<br />

all-trans retinol (%)<br />

100<br />

21<br />

24<br />

75<br />

24<br />

15<br />

8.4<br />

16.7

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