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You are watching: What part of the bacterial cell is most involved with gram staining and why

StatPearls . Treasure Island (FL): StatPearls Publishing; 2021 Jan-.



The Gram staining is just one of the most an important staining methods in microbiology. It it s okay its name from the Danish bacteriologist Hans Christian Gram who an initial introduced it in 1882, mostly to identify organisms causing pneumonia.<1> Often the first test performed, gram staining involves the use of decision violet or methylene blue as the main color.<2> The term for organisms that retain the major color and also appear purple-brown under a microscopic lense is Gram-positive organisms. The organisms that carry out not take it up main stain show up red under a microscope and are Gram-negative organisms.

 The very first step in gram staining is the usage of decision violet dye for the slide"s initial staining. The next step, additionally known as solving the dye, requires using iodine to form crystal violet- iodine complicated to stop easy remove of dye. Subsequently, a decolorizer, regularly solvent the ethanol and also acetone, is used to eliminate the dye. The simple principle that gram staining involves the capacity of the bacterial cell wall surface to retain the crystal violet dye during solvent treatment.<3> Gram-positive microbe have greater peptidoglycan content, vice versa, gram-negative organisms have higher lipid content.<4> 

Initially, all bacteria take it up decision violet dye; however, through the usage of solvent, the lipid layer indigenous gram-negative organisms is dissolved. Through the dissolution of the lipid layer, gram negatives shed the primary stain. In contrast, solvent dehydrates the gram-positive cell walls through the closure that pores avoiding diffusion the violet-iodine complex, and also thus, bacteria stay stained.<5> The size of decolorization is a an essential step in gram staining as an extensive exposure to a decolorizing agent deserve to remove every the stains indigenous both varieties of bacteria.<6>

The last step in gram staining is to use straightforward fuchsin stain to offer decolorized gram-negative bacteria pink shade for easier identification. It is also known as counterstain. Some laboratories usage safranin as a counterstain; however, an easy fuchsin stains gram-negative organisms more intensely 보다 safranin. Similarly, Hemophilus spp., Legionella app, and some anaerobic bacteria stain poorly through safranin.

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Specimen Collection

Various clinical specimens have the right to be provided to do Gram staining. Several of the generally used specimens are sputum, blood, cerebrospinal fluid, ascitic fluid, synovial fluid, pleural fluid, and urine, etc. Swabs native nostrils, throat, rectum, wound, and cervix, etc. Can also be used. The repertoire of specimens should constantly be in sterile containers.