Question

Physical agents responsible for denaturation of food proteins are

• A. UV light
• B. Heat
• C. High Pressure Processing
• D. Ultrasound

Hint:

Physical denaturation agents in food processing include thermal energy (Heat), mechanical sound energy (Ultrasound), light energy (UV), and hydrostatic forces (High Pressure).

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Denaturation is a process in which the native tertiary and quaternary structures of proteins are disrupted without breaking covalent peptide bonds.
This conformational change alters the functional, physical, and chemical properties of the proteins.
Denaturation can be caused by chemical agents (such as acids, bases, and organic solvents) or physical agents.

Step 2: Detailed Explanation:
Physical agents disrupt the non-covalent interactions (such as hydrogen bonds, hydrophobic interactions, and ionic bonds) that stabilize the folded state of proteins.
Let us analyze the listed physical agents:
UV light (A) carries high energy that can cleave weak bonds and disrupt the hydrophobic core of proteins.
Heat (B) is the most common physical agent; it increases thermal vibration, disrupting hydrogen bonding and causing unfolding.
High Pressure Processing (C) applies hydrostatic pressure that destabilizes hydrophobic interactions and electrostatic forces in proteins.
Ultrasound (D) causes acoustic cavitation, generating intense local shear stress and heat that denatures proteins.
Agitation (E) is generally classified as a mechanical or physical-shear agent that primarily induces surface-tension denaturation at interfaces.
Standard food chemistry classifications group UV light, Heat, High Pressure, and Ultrasound as the primary physical processing and irradiation agents responsible for protein denaturation.
Therefore, the option containing A, B, C, and D is the most appropriate choice.

Step 3: Final Answer
The physical agents responsible for the denaturation of food proteins are UV light, Heat, High Pressure Processing, and Ultrasound.