ArticleActa parasitologica2024
Improvement of the Diagnostic Method for the Detection of Parasite Eggs Using the Formalin Ethyl Acetate Concentration Technique.
Article in Acta parasitologica, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
purposeThe formalin-ethyl acetate (FEA) concentration method is commonly used in routine clinical practice to detect parasite eggs in feces. This procedure involves extraction of oil with the organic solvent ethyl acetate (EA), which reduces fecal sediment and provides a cleaner background for microscopic analysis. However, clinically, some sediment failed to float after EA treatment.
methodsHexane, commonly used in the food oil extraction from oilseeds did not float the feces. Gas chromatography-mass spectrometry (GC-MS) analysis showed that neither the amount of the oil nor the classes of the oil determined was differed whether hexane or EA was used to float the feces. Oil red, Bodipy and Calcofluor staining showed that the unabsorbed oil droplets in the fecal sediment were trapped within the leaf structure. HCl or acetic acid was added to see if the acid residue could dissolve the cellulose of the leaf to promote the bulk float.
resultsOur result showed that the fecal bulk contained the loosened mesophyll cell wall. The addition of acid residues improved fecal bulk float. The proximity of cellulose fiber to EA, but not hexane, may enhance the efficacy of oil extraction from cellulose.
conclusionThis is the first report that the interaction of cellulose with ethyl acetate in fecal solution has an effect on bulk float. This study improves the understanding of fecal bulk flotation and may assist in the visualization of parasite eggs in clinical practice with non-floating fecal samples in the FEA concentration method.
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