Hybrid separation technique A combination of paper chromatography with electrophoresis separates analytes based on which principles?

Introduction / Context:Some analytical methods intentionally blend mechanisms to increase resolution. Coupling paper chromatography (partition-based) with electrophoresis (field-driven migration) is a classic example used for amino acids, peptides, and small metabolites.

Given Data / Assumptions:

• Paper acts as a hydrophilic support containing immobilized water.
• A solvent front can induce partitioning; an electric field can simultaneously or sequentially drive ionic movement.
• Analytes may differ in both polarity and charge.

Concept / Approach:Paper chromatography relies on partitioning between water held in cellulose fibers (stationary) and a moving organic/aqueous solvent (mobile). Electrophoresis adds a second dimension: separation by electrophoretic mobility, which depends on charge and size in the buffer.

Step-by-Step Solution:Identify partition component: distribution between immobilized water and mobile phase.Identify electrophoresis component: migration under electric field based on net charge.Select the option acknowledging both mechanisms.

Verification / Alternative check:Two-dimensional separations (first electrophoresis, then chromatography, or vice versa) produce orthogonal patterns consistent with the two distinct principles.

Why Other Options Are Wrong:Option a ignores the electrophoretic contribution.Option b ignores the chromatographic partitioning.Option d is wrong because a combined mechanism is indeed correct.

Common Pitfalls:Assuming a single mechanism explains complex separations; overlooking the impact of pH on electrophoretic mobility.

Final Answer:Both partition chromatography and electrical mobility of ionic species.