Multiple choice

Which of the following is responsible for thickening of tomato paste with duration of time?

  1. Pectin methyl esterase

  2. Pectin ethyl esterase

  3. Pectin methyl peroxidase

  4. Pectin ethyl peroxidase
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A Correct answer
Explanation

Pectin methyl esterase (PME) is the enzyme responsible for the thickening of tomato paste over time. PME demethylates pectin, allowing calcium ions to cross-link pectin chains and form a gel network, increasing viscosity. The other options list non-existent enzymes.

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