True or False? Pre-beta (VLDL) lipoproteins migrate further toward the anode on polyacrylamide gel than they do on cellulose acetate or agarose.

True or False? Pre-beta (VLDL) lipoproteins migrate further toward the anode on polyacrylamide gel than they do on cellulose acetate or agarose.

• A. True
• B. False
• C. Cannot be determined
• D. Not applicable

Answer: (A)

Electrophoretic mobility depends on the particle’s net charge and the friction it experiences from the gel matrix. Pre-beta lipoproteins, or VLDL, carry a relatively high surface charge and are large particles, so their movement toward the anode is influenced by how the gel matrix interacts with them. Cellulose acetate and agarose gels have different interaction profiles and can retard lipoprotein movement through nonspecific binding or less optimal pore environments for these large complexes. Polyacrylamide, with its tighter, more uniform pore structure and generally weaker nonspecific interactions with lipoproteins, presents a different frictional environment. This tends to allow VLDL to migrate farther toward the anode than they do in cellulose acetate or agarose, making them appear more anodally displaced on a polyacrylamide gel. Therefore, the statement is true.

Electrophoretic mobility depends on the particle’s net charge and the friction it experiences from the gel matrix. Pre-beta lipoproteins, or VLDL, carry a relatively high surface charge and are large particles, so their movement toward the anode is influenced by how the gel matrix interacts with them. Cellulose acetate and agarose gels have different interaction profiles and can retard lipoprotein movement through nonspecific binding or less optimal pore environments for these large complexes. Polyacrylamide, with its tighter, more uniform pore structure and generally weaker nonspecific interactions with lipoproteins, presents a different frictional environment. This tends to allow VLDL to migrate farther toward the anode than they do in cellulose acetate or agarose, making them appear more anodally displaced on a polyacrylamide gel. Therefore, the statement is true.