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Sudan dyes have high affinity to fats, therefore they are used to demonstrate triglycerides, lipids, and lipoproteins. Alcoholic solutions of Sudan dyes are usually used, however pyridine solutions can be used in some situations as well. Sudan stain test is often used to determine the level of fecal fat to diagnose steatorrhea.
Sudan IV (C 24 H 20 N 4 O) is a lysochrome (fat-soluble dye) diazo dye used for the staining of lipids, triglycerides and lipoproteins on frozen paraffin sections. It has the appearance of reddish brown crystals with melting point 199 °C and maximum absorption at 520(357) nm. Sudan IV is one of the dyes used for Sudan staining.
Sudan III is a dye used for Sudan staining. Similar dyes include Oil Red O, Sudan IV, and Sudan Black B. They are used for staining of triglycerides in frozen sections, and some protein bound lipids and lipoproteins on paraffin sections. It has the appearance of reddish brown crystals and a maximum absorption at 507(304) nm. [6]
In the simplest form of the fecal fat test, a random fecal specimen is submitted to the hospital laboratory and examined under a microscope after staining with a Sudan III or Sudan IV dye ("Sudan staining"). Visible amounts of fat indicate some degree of fat malabsorption.
This can all mess with your blood pressure, cholesterol levels, and waistline,” says Dr. Klodas. “We all have time constraints and need to order out from time to time. Just make this the ...
Intracellular lipids (Burdon's method) Lipids are stained with fat soluble dyes like Sudan black. On application of Sudan black-B dyes move into lipids and are retained there while cytoplasm is counter stained with safranin. To detect the presence of lipids in cell wall, cell membrane or fat globules (PHB in cytoplasm) Lipid granules: Deep blue,