Why is Edman degradation preferred over mass spectrometry for differentiating isomeric amino acids like Leucine and Isoleucine?

• A. Edman degradation is faster than mass spectrometry.
• B. Edman degradation can differentiate isomers based on their sequence, while mass spectrometry cannot.
• C. Edman degradation is less expensive than mass spectrometry.
• D. Edman degradation requires less sample preparation than mass spectrometry.

Answer: (B)