Acetyl Value (AcV)

• Definition of Acetyl Value (AcV):

  • The acetyl value is the number of milligrams of potassium hydroxide (KOH) required to neutralize the acetic acid liberated from 1 gram of acetylated fat or oil.

• Significance of Acetyl Value (AcV):

  • Provides information about the hydroxyl groups present in the fat or oil, which are acetylated during the process.
  • Important for identifying the presence of hydroxylated fatty acids or alcohols within the fat.

• Principle:

  • The fat or oil is acetylated (reacted with acetic anhydride), and the acetylated product is hydrolyzed.
  • The liberated acetic acid is then titrated with KOH to determine the acetyl value.

• Equation:

  • $\text{Acetyl Value (AcV)} = \frac{\text{Volume of KOH (mL)} \times \text{Normality of KOH} \times 56.1}{\text{Weight of sample (g)}}$

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