Question CI.39: Butter is a fat that contains 80.% by mass triacylglycerols;...
Butter is a fat that contains 80.% by mass triacylglycerols; the rest is water. Assume the triacylglycerol in butter is glyceryl tripalmitate. (2.4, 2.5, 2.6, 7.2, 7.6, 14.4, 18.7)
a. Write the balanced chemical equation for the hydrolysis of glyceryl tripalmitate.
b. What is the molar mass of glyceryl tripalmitate, C_{51}H_{98}O_6 ?
c. Calculate the ATP yield from the complete oxidation of palmitic acid, the C_{19} saturated fatty acid.
d. How many kilocalories are released from the palmitic acid in a 0.50-oz pat of butter?
e. If running for 1 h uses 750 kcal, how many pats of butter would provide the energy (kcal) for a 45-min run?
a.\begin{array}{lllll} &O \\ &|| \\ \mathrm{CH}_{2}-\mathrm{O}- &\stackrel{}{\mathrm{C}}-\left(\mathrm{CH}_{2}\right)_{14}-\mathrm{CH}_{3} & \mathrm{CH}_{2}-\mathrm{OH}\\ |&O &| & O\\ |&|| & | & || \\ \mathrm{CH}-\mathrm{O}-&\stackrel{}{\mathrm{C}}-\left(\mathrm{CH}_{2}\right)_{14}-\mathrm{CH}_{3}+3 \mathrm{H}_{2} \mathrm{O} \longrightarrow & \mathrm{CH}-\mathrm{OH}+3 \mathrm{HO}-&\stackrel{}{\mathrm{C}}-\left(\mathrm{CH}_{2}\right)_{14}-\mathrm{CH}_{3}\\ |&O&| \\ |&|| & | \\ \mathrm{CH}_{2}-\mathrm{O}-&\stackrel{}{\mathrm{C}}-\left(\mathrm{CH}_{2}\right)_{14}-\mathrm{CH}_{3} & \mathrm{CH}_{2}-\mathrm{OH} \end{array}
b. glyceryl tripalmitate, 807 g/mole
c. 106 ATP
d. 33 kcal
e. 17 pats of butter