Question Bank • QB_APE_EXP_046
MSQ • 2 Marks
Section 6: Agricultural Process Engineering
Processing of Agriculture Produce
Subtopic: Processing of seeds, spices, fruits and vegetables
Question Statement:
Which of the following thermal/physical pre-treatments facilitate oil recovery from oilseeds prior to mechanical expression?
Options:
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(A) Cracking and flaking of seeds to rupture cellular lipid vacuoles
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(B) Conditioning/cooking with moisture and heat to coalesce oil droplets and adjust plasticity
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(C) Dehulling to reduce fiber and improve cake protein quality
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(D) Deep freezing to $-40^\circ\text{C}$ to solidify lipid triglycerides
Step-by-Step Solution & Explanation
Pre-treatments for mechanical expression:
• Flaking reduces path length and ruptures seed cell walls (A).
• Cooking/conditioning ($85 - 100^\circ\text{C}$) denatures proteins, coalesces microscopic oil droplets, and lowers oil viscosity (B).
• Dehulling prevents wax extraction into the oil and minimizes oil absorption into husk fibers (C).
Freezing solidifies lipids, preventing liquid flow.
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