Microbiology Procedure
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Index >> Staining Methods in Microbiology >> Staining Method of Gohar

Staining Method of Gohar

Staining Method of Gohar
In this procedure (6), Loeffler's methylene blue is used to stain both metachromatic granule and cytoplasm. Differentiation of these two is made by selective decolourization of cytoplasm. Methylene blue in the granule is fixed in place with iodine and colourless cytoplasm is stained differentially with eosin during the subsequent step.

Prepare the smear and fix it by heat. Stain with Loeffler's methylene blue (S18) for 5 minutes and wash. Decolourize with 0.1 % H2SO4 for few seconds and wash. Treat with Gram's iodine (824) for 1 minute and wash. Counterstain with 1% eosin-Y for 1 minute. Wash, blot dry and examine under oil-immersion objective. Methachromatic granule appears black while cytoplasm as pink

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