An example of a solvent used in the Oil Red O and Sudan Black B methods that prevents the loss of lipids during fat staining is:

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Multiple Choice

An example of a solvent used in the Oil Red O and Sudan Black B methods that prevents the loss of lipids during fat staining is:

Explanation:
Preserving lipids during fat staining hinges on using a solvent that carries the dye into the tissue without dissolving the lipids themselves. Propylene glycol serves this role well because it dissolves the lipid-soluble dyes (like Oil Red O and Sudan Black B) while remaining gentler on lipids than common organic solvents. Ethanol, acetone, or xylene are more likely to extract or wash out lipids, which can lead to reduced or faded lipid staining. By using propylene glycol, the lipids stay in place long enough for the dye to bind, producing clear, reliable staining of fat within frozen sections.

Preserving lipids during fat staining hinges on using a solvent that carries the dye into the tissue without dissolving the lipids themselves. Propylene glycol serves this role well because it dissolves the lipid-soluble dyes (like Oil Red O and Sudan Black B) while remaining gentler on lipids than common organic solvents. Ethanol, acetone, or xylene are more likely to extract or wash out lipids, which can lead to reduced or faded lipid staining. By using propylene glycol, the lipids stay in place long enough for the dye to bind, producing clear, reliable staining of fat within frozen sections.

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