Propidium iodide (PI) is a popular red-fluorescent nuclear and chromosome counterstain. Since propidium iodide is not permeant to live cells,Read more
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Catalog number P3566
Price (USD)
103.00
Each
Add to cart
Price (USD)
103.00
Each
Add to cart
Propidium iodide (PI) is a popular red-fluorescent nuclear and chromosome counterstain. Since propidium iodide is not permeant to live cells, it is also commonly used to detect dead cells in a population.
PI binds to DNA by intercalating between the bases with little or no sequence preference. In aqueous solution, the dye has excitation/emission maxima of 493/636 nm. Once the dye is bound, its fluorescence is enhanced 20- to 30-fold, the fluorescence excitation maximum is shifted ∼30–40 nm to the red and the fluorescence emission maximum is shifted ∼15 nm to the blue, resulting in an excitation maximum at 535 nm and fluorescence emission maximum at 617 nm.
PI is widely used in fluorescence microscopy, confocal laser scanning microscopy, flow cytometry, and fluorometry.
For Research Use Only. Not for use in diagnostic procedures.
Specifications
Detection MethodFluorescence
For Use With (Application)Viability Assay
For Use With (Equipment)Fluorescence Microscope, Flow Cytometer
Product TypePropidium Iodide
Dye Typepropidium iodide
Emission533⁄617
FormSolution
Quantity10 mL
Shipping ConditionRoom Temperature
Sub Cellular LocalizationCytoplasm & Cytosol
Unit SizeEach
Contents & Storage
Contains 1 bottle of propidium iodide(1.0 mg/mL solution in water). Store in refrigerator (2–8°C) and protect from light.
Frequently asked questions (FAQs)
I have a LIVE/DEAD BacLight Bacterial Viability kit that has SYTO 9 and propidium iodide in it. Will I be able to stain eukaryotic cells that have engulfed bacteria and determine if the bacteria are alive or dead using this kit?
Unfortunately, no. SYTO 9 will label the nuclei of live or dead cells, including the eukaryotic cells. Propidium iodide is cell impermeant, and will only enter dead cells. If the eukaryotic cells are dead, they will label with propidium iodide as well. If the eukaryotic cells are alive, propidium iodide will not be able to enter and thus will not label the bacteria inside, whether the bacteria are alive or dead. We are not aware of any way to do a viability assay of bacteria once they have been engulfed by cells.
Is propidium iodide (PI) fixable with glutaraldehyde or paraformaldehyde (PFA)?
PI is not fixable with glutaraldehyde or PFA. Both reagents fix by crosslinking amines. PI and other nucleic acid stains do not inherently bind covalently to nucleic acids and these fixatives do not crosslink the dyes to nucleic acids.
The one fixable nucleic acid stain is Ethidium Monoazide Bromide (EMA), Cat no. E1374); it covalently binds to nucleic acids upon activation by exposure to light.