Which of the following statements about liposomes are true?

Question

BlackTom AI · Accepted Answer

First, let's restate the question and list the options to ensure clarity about what's being evaluated.
Question: Which of the following statements about liposomes are true?
Options:
- a. Liposomes are smaller than micelles, but larger than cyclodextrin
- b. Cholesterol is added to liposomal formulations to rigidify the lipid membrane and prevent drug leakage
- c. Passive loading of hydrophilic drugs is highly efficient in liposomes
- d. Hydrophilic, hydrophobic and amphiphilic drugs can be loaded into liposomes

Now, evaluate each option one by one:
Option a: 'Liposomes are smaller than micelles, but larger than cyclodextrin.' Liposomes are phospholipid bilayer vesicles with an aqueous core and typically range from tens to hundreds of nanometers, whereas micelles are usually 5–20 nm in size and cyclodextrins are small cyclic oligosaccharides that are even smaller. Therefore, the claim that liposomes are smaller than micelles and larger than cyclodextrin contradicts established size ranges. This makes option a incorrect.
Option b: 'Cholesterol is added to liposomal formulations to rigidify the lipid membrane and prevent drug leakage.' Cholesterol is indeed commonly incorporated into liposome formulations. It intercalates among phospholipid tails, reducing membrane permeability and enhancing stability, which helps reduce drug leakage. This statement is accurate. Note that while cholesterol can also affect fluidity and phase behavior, the core idea—rigidifying the membrane to reduce leakage—is consistent with liposome design principles.
Option c: 'Passive loading of hydrophilic drugs is highly efficient in liposomes.' In practice, passive loading of hydrophilic drugs into the aqueous core of pre-formed liposomes is often inefficient and yields variable encapsulation. Active or remote loading methods (e.g., using a pH or ion gradient) are typically employed to achieve higher loading efficiency for many hydrophilic compounds. Therefore, this claim is generally incorrect.
Option d: 'Hydrophilic, hydrophobic and amphiphilic drugs can be loaded into liposomes.' Liposomes have dual compatibility: hydrophilic drugs can be encapsulated in the aqueous core, hydrophobic drugs can partition into the lipid bilayer, and amphiphilic drugs can associate with both regions depending on their balance of hydrophilicity and hydrophobicity. This statement accurately reflects the versatility of liposome loading capabilities. Hence, option d is correct.

In summary, option a is inaccurate due to size comparisons, option c overstated passive loading efficiency for hydrophilic drugs, while options b and d correctly reflect well-established features of liposome design and loading capability.

Which of the following statements about liposomes are true?多项选择题

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