Utilizing enzymatic digestion procedures in the bioanalytical laboratory.

Area of Science:

• Analytical Chemistry
• Biochemistry
• Biotechnology

Background:

• Liquid chromatography-mass spectrometry (LC-MS) is gaining prominence in bioanalytical laboratories for quantifying peptide/protein biomarkers and biotherapeutics.
• Improvements in mass spectrometry (MS) sensitivity and the ability to overcome immunoassay limitations (selectivity, reagent availability) drive this trend.
• Large proteins (>10 kDa) present challenges in chromatography and ionization.

Purpose of the Study:

• To address the challenges of quantifying large proteins using LC-MS/MS.
• To provide recommendations for enzymatic digestion techniques for large proteins.
• To suggest suitable internal standards for surrogate peptide quantitation.

Main Methods:

• Review and summarization of enzymatic digestion techniques applicable to large proteins for LC-MS/MS analysis.
• Identification and discussion of potential internal standards for quantifying surrogate peptides.
• Focus on LC-MS/MS workflows for proteins exceeding 10 kDa.

Main Results:

• Enzymatic digestion is a key strategy to enable LC-MS/MS quantitation of large proteins by analyzing surrogate peptides.
• Specific digestion methods and appropriate internal standards are crucial for accurate and reliable quantification.
• The summarized recommendations aim to optimize workflows for large protein analysis.

Conclusions:

• LC-MS/MS workflows employing enzymatic digestion and surrogate peptide quantitation are effective for analyzing large proteins (>10 kDa).
• Careful selection of digestion techniques and internal standards is vital for successful bioanalytical applications.
• These strategies enhance the utility of LC-MS in biopharmaceutical analysis and biomarker discovery.