Which of the following is NOT listed as a lipid stain for lipoprotein visualization?

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Multiple Choice

Which of the following is NOT listed as a lipid stain for lipoprotein visualization?

Explanation:
Visualizing lipids relies on dyes that dissolve in fats and partition into lipid-rich regions. Oil Red O is a fat-soluble dye that stains neutral lipids in frozen sections, making them appear red. Sudan Black B and Sudan III are lysochrome dyes that also partition into lipids, highlighting lipid-rich structures and lipoproteins. Congo red, however, is not a lipid stain; it binds to amyloid fibrils and shows apple-green birefringence under polarized light, which is used to identify amyloid deposits, not lipids. So Congo red does not belong with the lipid stains used for lipoprotein visualization.

Visualizing lipids relies on dyes that dissolve in fats and partition into lipid-rich regions. Oil Red O is a fat-soluble dye that stains neutral lipids in frozen sections, making them appear red. Sudan Black B and Sudan III are lysochrome dyes that also partition into lipids, highlighting lipid-rich structures and lipoproteins. Congo red, however, is not a lipid stain; it binds to amyloid fibrils and shows apple-green birefringence under polarized light, which is used to identify amyloid deposits, not lipids. So Congo red does not belong with the lipid stains used for lipoprotein visualization.

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