Question

__________ is widely used for the analysis of small molecules and ions, such as sugars and amino acids, and is applied to the separation and purification of macromolecules, such as protein and polysaccharides.

• A. GC-MS
• B. SFC
• C. HPLC
• D. IR spectroscopy

Hint:

HPLC is the premier chromatographic tool for non-volatile, polar, and macromolecular food components (like proteins, sugars, and polysaccharides) that cannot be analyzed by Gas Chromatography.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Chromatographic techniques are highly sophisticated analytical tools used in food science to separate, identify, and quantify various chemical constituents in food matrices.
The choice of chromatographic technique depends on the molecular weight, volatility, thermal stability, and ionic nature of the target compounds.

Step 2: Detailed Explanation:
High-Performance Liquid Chromatography (HPLC) is a highly versatile liquid chromatographic technique that utilizes liquid mobile phases under high pressure to separate mixtures.
It is exceptionally suited for the following applications:
1. Small Molecules and Ions: Highly polar, non-volatile, or thermally unstable small molecules such as monosaccharides, oligosaccharides, amino acids, and organic acids can be easily separated and quantified using HPLC coupled with appropriate detectors (such as refractive index, UV-Vis, or fluorescence detectors).
2. Macromolecules: Size-Exclusion Chromatography (SEC) and Ion-Exchange Chromatography (IEC), which are major modes of HPLC, are widely used for the separation, purification, and molecular weight determination of large biomacromolecules like proteins, enzymes, and complex polysaccharides.
Let us compare this with the other options:
- GC-MS (Gas Chromatography-Mass Spectrometry): Requires analytes to be volatile and thermally stable. It cannot be used directly for large macromolecules like proteins or polysaccharides without intensive destructive degradation.
- SFC (Supercritical Fluid Chromatography): Primarily useful for non-polar, lipid-soluble compounds and chiral separations.
- IR Spectroscopy: An analytical spectroscopy tool used for functional group identification, not a physical separation and purification technique.

Step 3: Final Answer:
Thus, HPLC is widely used for the analysis of small molecules and macromolecules.