High quality and unsurpassed reliability in Gram Staining from a name you trust
For over 100 years, the cornerstone of differential staining for positive and negative bacteria has been the Gram Stain. The Gram Stain procedure allows bacteria to be placed into two large groups, Gram Positive and Gram Negative, based on both chemical and physical properties of their cell walls. Gram-Positive Bacteria have a thick, meshy cell wall made up of peptidoglycan which stains purple. Gram-Negative Bacteria have a thinner layer, which stains pink, and an outer membrane, which contains lipds, while having periplasmic space between the membrane and cell wall.
American MasterTech has taken what Hans Christian Gram, a Danish scientist, created in 1882 and made it much safer to use. The McDonald's Gram Stain Kit stains bacteria in less than 5 minutes and is comparable to the Brown & Brenn and Modified Gram Methods. It differs from these methods since it uses Carbol Fuchsin instead of Saffranin, which intensifies the stains. The McDonald's Gram Stain Kit is also safer to use than the Brown & Hopps Method because it does not require the hazardous Gallegos Differentiating solution and picric acid/acetone. Both Gentian Violet and Carbol Fuchsin serve as the primary stains in the McDonald's Gram Stain Kit, producing blue gram-positive bacteria and red gram-negative bacteria against a yellow background, counterstained by Tartrazine.
American MasterTech offers over 50 Histology Special Stain Kits. Click here to see our entire line of Histology Stains Kits.
McDonald's Gram Stain Kit The McDonald's Gram Stain Kit is available in these sizes(s):
100ml Kit or Pint Kit
Click on the link above to view the current pricing on the McDonald's Gram Stain Kit.
Gram Positive/Gram Negative Control Slides Gram Positive/Gram Negative Control Slide is available in these sizes(s):
5 Pack, 25 Pack, or QC Pack (QC contains one stained slide and 24 unstained slides)
Click on the link above to view the current pricing on Gram Positive/Gram Negative Control Slide.