CFC Flavor Extraction & Isolation Techniques 2

Question 1

The Simultaneous Distillation Extraction (SDE) technique, also known as the Likens-Nickerson apparatus, combines:

Accepted Answer

Steam distillation and solvent extraction in a single continuous step

Answer

The Likens-Nickerson apparatus simultaneously distills volatiles from a heated aqueous sample while continuously extracting them into a small volume of organic solvent, improving sensitivity and throughput.

Question 2

Molecular distillation (short-path distillation) is specifically advantageous for flavor concentrate processing because it:

Accepted Answer

Operates at very low pressures allowing distillation at temperatures below normal boiling points

Answer

Molecular distillation operates at high vacuum (0.001–1 mmHg) with an extremely short path between evaporator and condenser, enabling distillation of heat-sensitive flavor compounds at temperatures far below their atmospheric boiling points.

Question 3

Vacuum distillation of flavor concentrates compared to atmospheric distillation primarily offers the advantage of:

Accepted Answer

Reducing the boiling point of volatile components to prevent thermal degradation

Answer

Reducing system pressure lowers the boiling point of volatile flavor compounds, minimizing thermal stress and preserving thermolabile aroma chemicals that would degrade at atmospheric distillation temperatures.

Question 4

Solvent-Assisted Flavor Evaporation (SAFE) distillation is designed to:

Accepted Answer

Gently isolate volatiles from lipid-rich matrices under high vacuum without emulsification problems

Answer

SAFE uses high vacuum (~10⁻⁴ mbar) to distill an organic extract at room temperature, cleanly separating volatiles from non-volatile lipids that would otherwise co-elute and interfere with GC analysis.

Question 5

In fractional distillation of a flavor mixture, the key parameter that determines separation efficiency between two components is:

Accepted Answer

The relative volatility (α) between the components

Answer

Relative volatility (α = P₁*/P₂*) expresses the ratio of vapor pressures of the two components; values significantly greater than 1 indicate good separation potential in fractional distillation.

CFC - Certified Flavor Chemist Practice Test

CFC - Certified Flavor Chemist Practice Test

CFC Flavor Extraction & Isolation Techniques 2