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Chapter 26: Problem 46

Draw the structural formula of a lecithin containing one molecule each of palmitic acid and linoleic acid.

Short Answer

Expert verified
Answer: CH3-(CH2)14-COO-CH2-CH(-O-phosphate-choline)-CH2-OOC-CH3-(CH2)4-CH=CH-CH2-CH=CH-(CH2)7-COOH

Step by step solution

01

Identify the structure of palmitic acid

Palmitic acid is a saturated fatty acid with the molecular formula C16H32O2. Its structure is a straight carbon chain with 16 carbons and a carboxyl group (-COOH) at one end. The structure is: CH3-(CH2)14-COOH
02

Identify the structure of linoleic acid

Linoleic acid is an unsaturated fatty acid with the molecular formula C18H32O2. Its structure contains two double bonds between carbon atoms which makes it a polyunsaturated fatty acid. The structure is: CH3-(CH2)4-CH=CH-CH2-CH=CH-(CH2)7-COOH
03

Identify the structure of lecithin

Lecithin is a phospholipid that contains two fatty acid molecules, a glycerol molecule, and a phosphate group attached to a choline headgroup. The general structure of lecithin is: R1COO-CH2-CH(-O-phosphate-choline)-CH2-OOCR2 Where R1 and R2 are fatty acid chains.
04

Combine the fatty acids with the lecithin structure

Now, it's time to integrate the structures of palmitic acid and linoleic acid into the lecithin structure. We need to replace R1 and R2 with the corresponding fatty acids to create a lecithin molecule that contains one molecule each of palmitic acid and linoleic acid. For this, we can use the following structure: PalmiticAcidCOO-CH2-CH(-O-phosphate-choline)-CH2-OOC-LinoleicAcid
05

Simplify the structural formula

Now, we can replace the names of the fatty acids with their structures to get the final structural formula of the lecithin molecule containing one molecule each of palmitic acid and linoleic acid. CH3-(CH2)14-COO-CH2-CH(-O-phosphate-choline)-CH2-OOC-CH3-(CH2)4-CH=CH-CH2-CH=CH-(CH2)7-COOH This is the final structural formula of a lecithin molecule containing one molecule each of palmitic acid and linoleic acid.

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Most popular questions from this chapter

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