Biochemistry
Biochemistry
9th Edition
ISBN: 9781319114671
Author: Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher: W. H. Freeman
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Question
Part A: Explain solubility of vitamins Food additive E307 (alpha-tocopherol, vit. E), and ascorbic acid (vit. C) are essential nutrients in human diet due to their antioxidant properties. They have very different solubilities. In contrast to vit. A, vit. E is insoluble in water. It is recommended that foods rich in vitamin E be taken with fatty ingredients (think salad dressing etc). • Draw the structures of both vitamins and explain their different solubilities in water. • Draw the picture illustrating solvation of vit. C in water and describe intermolecular interactions that facilitate this process. What type of intermolecular interactions help vitamin E be soluble in oils (fatty acids such as linoleic acid)? Part B: Explain observed boiling point The two molecules shown in Fig. 1 are constitutional isomers but have drastically different boiling point. Using a drawing and no more than 5 sentences explain how why compound B (butyramide) has higher boiling point. A O во NH2 153 °C 216 °C Figure 1: Isomeric amides
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Transcribed Image Text:Part A: Explain solubility of vitamins Food additive E307 (alpha-tocopherol, vit. E), and ascorbic acid (vit. C) are essential nutrients in human diet due to their antioxidant properties. They have very different solubilities. In contrast to vit. A, vit. E is insoluble in water. It is recommended that foods rich in vitamin E be taken with fatty ingredients (think salad dressing etc). • Draw the structures of both vitamins and explain their different solubilities in water. • Draw the picture illustrating solvation of vit. C in water and describe intermolecular interactions that facilitate this process. What type of intermolecular interactions help vitamin E be soluble in oils (fatty acids such as linoleic acid)? Part B: Explain observed boiling point The two molecules shown in Fig. 1 are constitutional isomers but have drastically different boiling point. Using a drawing and no more than 5 sentences explain how why compound B (butyramide) has higher boiling point. A O во NH2 153 °C 216 °C Figure 1: Isomeric amides
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