Question

The enzyme preferred for desizing is

• A. \(\alpha\)-Amylase
• B. \(\beta\)-Amylase
• C. \(\gamma\)-Amylase
• D. Lipase

Hint:

\( \alpha \)-Amylase is the preferred enzyme for desizing because it rapidly and randomly breaks down starch, the most common sizing agent.

Answer 1

The Correct Option is A

Step 1: Understanding Desizing: Desizing is the process of removing the size material applied to warp yarns before weaving. Size is typically a starch-based coating that adds strength and abrasion resistance to the yarn, allowing it to withstand the stresses of weaving. After weaving, the size must be removed to allow for proper dyeing and finishing.
Step 2: Enzymes for Desizing: Enzymes are often used for desizing, particularly for starch-based sizes. Enzymes are biocatalysts that break down specific substances.
Step 3: Types of Amylases: \(\alpha\)-Amylase: Breaks down starch molecules randomly along the chain, producing shorter chains (dextrins) and some glucose. It works efficiently at high temperatures. \(\beta\)-Amylase: Breaks down starch from the non-reducing end of the chain, producing maltose (a disaccharide). \(\gamma\)-Amylase: Breaks down starch to glucose.
Step 4: \(\alpha\)-Amylase Preference: \(\alpha\)-Amylases are preferred for desizing because they rapidly and randomly break down the starch, making it easier to remove. \(\beta\)-Amylases are slower and produce maltose, which can be sticky. Lipases break down fats, not starch.