Why some bacteria turn purple and others turn pink
In short: The Gram stain is a fundamental diagnostic tool in microbiology. This video explains how the physical structure of bacterial cell walls determines their reaction to specific dyes, allowing scientists to categorize pathogens.
Bacteria are classified into two main groups based on their cell wall composition: Gram-positive and Gram-negative. During the staining process, Gram-positive bacteria retain the crystal violet dye and appear purple, while Gram-negative organisms take on a pink color known as fuscin.
The distinction lies in complex structural components. Gram-positive walls contain peptidoglycan along with lipoteichoic acid and teichoic acid. In contrast, Gram-negative structures involve different arrangements of peptidoglycan and lipopolysaccharide (LPS), the latter of which is associated with endotoxins.
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Sources
- Summary by Intellect · source: The Gram Stain (Gram-Positive vs Gram-Negative) and Bacterial Structure | Microbiology 🧫
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