Neutral Red Solution Extra Pure

Neutral Red Solution Extra Pure

Primary Uses

1. Vital Stain in Cell Biology and Microbiology
   • Used as a vital stain to distinguish between living and dead cells in cultures. Living cells actively take up the dye and accumulate it in lysosomes, appearing red, while dead cells do not sequester the stain effectively. It is also used to visualize phagocytosis and lysosomal activity.
2. pH Indicator in Biochemical and Microbiological Media
   • Functions as a pH indicator, changing color from red (at pH 6.8 and below) to yellow (at pH 8.0 and above). This property is utilized in culture media to indicate acid production by microorganisms, such as in the Neutral Red Broth test for differentiating enteric bacteria.
3. Endpoint Indicator in Titration Analysis
   • Employed as a visual endpoint indicator in acid-base titrations within its specific pH transition range. Its clear color change is useful in analytical chemistry procedures where a sharp visual cue is needed for neutralization points in slightly acidic to basic transitions.
4. Assay Reagent for Cytotoxicity and Cell Viability
   • Used in the Neutral Red Uptake (NRU) assay, a standard in vitromethod to assess cell viability and cytotoxicity. The amount of dye incorporated by healthy, viable cells is quantified spectrophotometrically, providing a measure of the toxic effects of chemicals or environmental samples.

Secondary Uses

1. Stain for Histological and Microscopic Observation
   • Used as a supravital stain for temporary staining of blood samples and other tissues to highlight specific cellular structures, such as granules or organelles, under a light microscope for educational or preliminary diagnostic purposes.
2. Marker in Soil Science and Ecotoxicology Studies
   • Applied in soil science experiments to stain and visualize microbial colonies directly on soil particles. It is also used as a bioindicator in ecotoxicology to assess the health of invertebrate or microbial communities exposed to pollutants.
3. Photosensitizer in Photodynamic Studies
   • Investigated for use in photodynamic therapy (PDT) research and related studies. When taken up by cells and exposed to specific light wavelengths, Neutral Red can generate reactive oxygen species, leading to targeted cell death in experimental models.
4. Teaching Tool for Membrane Permeability and Transport
   • An ideal reagent for classroom demonstrations and student laboratories to study concepts of membrane permeability, active transport (as its uptake is energy-dependent), and lysosomal function in eukaryotic cells.