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Q.
Maximum amount of energy/ATP is liberated on oxidation of:
Jharkhand CECEJharkhand CECE 2004
Solution:
Fat is a triglyceride made of a molecule of glycerol and three molecules of fatty acid. Glycerol forms glyceraldehyde phosphate which yields $18-19$ ATP molecules. Fatty acid undergo $\beta$ - oxidation and forms acetyl $Co - A , NADH _{2}$ and $FADH _{2}$. Acetyl Co-A enters Krebs cycle and yields $12$ ATP. Therefore, fats provides more energy per gram as compared to carbohydrate. For example Palmitic acid $\left( C _{6} H _{32} O _{2}\right)$ yields 8 acetyl Co-A and $7\left( NADH _{2}+F A D H_{2}\right)$ i.e., $129$ ATP.