Introductory Food Technology

• Bancroft's Rule of Emulsion Formulation:
• Theoretical Axiom:
• 'The phase in which an emulsifier is preferentially soluble constitutes the continuous (external) phase of the emulsion.'
• Application:
• If a surfactant has low Hydrophile-Lipophile Balance (HLB $3 - 6$) and is soluble in the oil phase, it stabilizes Water-in-Oil (W/O) emulsions (e.g., butter, margarine).
• Hydrophilic surfactants (HLB $8 - 18$) soluble in water form Oil-in-Water (O/W) emulsions (e.g., milk, mayonnaise).
• Conclusion: Water-in-oil emulsions (Option 2).

Correct option: (2) Water-in-oil emulsions

• Use of Ice / Chilled Water in Emulsion Meat Products (Sausages):
• Thermal Control in High-Speed Bowl Chopping:
• Extreme friction during high-speed bowl chopping generates intense heat.
• Adding flake ice or chilled water ($0 - 4^\circ\text{C}$) keeps the meat batter below critical temperature ($\lt 15 - 18^\circ\text{C}$ for pork, $\lt 20^\circ\text{C}$ for beef), preventing the breakdown of the meat protein-fat emulsion and avoiding fat oiling-out.
• Conclusion: It helps in preventing the break-down of emulsion (Option 3).

Correct option: (3) It helps in preventing the break-down of emulsion

Evaluating the Assertion and Reason concerning Other convenience foods from fruits and vegetables:

The correct answer is Option 4: (A) is false but (R) is true..

• Delayed Bitterness in Citrus (Mandarin) Juices:
• Biochemical Origin:
• Intact fruit albedo contains the non-bitter precursor limonoate A-ring lactone.
• Upon juicing and cellular disruption, acidic pH ($\lt 4.5$) and endogenous limonin D-ring lactone hydrolase catalyze lactonization, closing the D-ring to generate intensely bitter limonin (a triterpenoid dilactone, printed as Limonene in OCR).
• Conclusion: Limonene (Option 1).

Correct option: (1) Limonene