What technique differentiates among several amino acids?

What technique differentiates among several amino acids?

• A. Electrophoresis
• B. Microbiological analysis
• C. Enzyme immunoassay
• D. Chromatography

Answer: (D)

Differentiating among amino acids relies on their chemical differences, and chromatography uses that by separating compounds according to how they interact with a stationary phase versus a moving solvent. Each amino acid has a unique affinity for the stationary phase based on polarity, charge, and side-chain properties, so they travel through the system at different rates. In practice, you can use various chromatography setups (such as ion-exchange, reversed-phase, or HPLC) and tune the pH and solvent to maximize those differences, yielding distinct retention times or elution positions for each amino acid. This allows identification and quantification of multiple amino acids in a mixture in a single analysis. Electrophoresis separates primarily by charge under an electric field and can distinguish some amino acids under specific conditions, but chromatography generally provides higher resolution for many amino acids simultaneously. Immunoassays and microbiological analyses are not used for differentiating amino acids in a mixture.

Differentiating among amino acids relies on their chemical differences, and chromatography uses that by separating compounds according to how they interact with a stationary phase versus a moving solvent. Each amino acid has a unique affinity for the stationary phase based on polarity, charge, and side-chain properties, so they travel through the system at different rates. In practice, you can use various chromatography setups (such as ion-exchange, reversed-phase, or HPLC) and tune the pH and solvent to maximize those differences, yielding distinct retention times or elution positions for each amino acid. This allows identification and quantification of multiple amino acids in a mixture in a single analysis.

Electrophoresis separates primarily by charge under an electric field and can distinguish some amino acids under specific conditions, but chromatography generally provides higher resolution for many amino acids simultaneously. Immunoassays and microbiological analyses are not used for differentiating amino acids in a mixture.