What is the purpose of propidium iodide?
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.
What is the wavelength of propidium iodide?
Propidium Iodide Spectrum On a flow cytometer PI is typically excited by 488 or 561 nm and can be detected in a 610/20 bandpass.
Is propidium iodide cell permeable?
Both DAPI and Hoechst are living cell-permeable DNA stains, while PI is impermeable to cells with an intact plasma membrane and thus it can be used to distinguish between dead cells and living cells.
What is the principle of FACS?
The basic principle of flow cytometry is the passage of cells in single file in front of a laser so they can be detected, counted and sorted. Cell components are fluorescently labelled and then excited by the laser to emit light at varying wavelengths.
What is FSC a measure of?
The measurement of forward scatter allows for the discrimination of cells by size. FSC intensity is proportional to the diameter of the cell, and is primarily due to light diffraction around the cell. Forward scatter is detected by a photodiode, which converts the light into an electrical signal.
What is propidium iodide staining used for?
Propidium iodide staining of cells for cell cycle analysis. This method provides a general procedure for DNA staining for cell cycle analysis using propidium iodide (PI). These are guidelines only and the incubation times may need to be adjusted for different cell types.
Can I use propidium iodide staining with 70% ethanol overnight for FACs?
I want to analyze cell cycle (apoptosis specifically) using FACS with propidium iodide staining. After collecting cell sample (control as well as treated), i fix it with 70% ethanol overnight. But i am afraid that cell may die during this interval, giving false results then.
What is propidium iodide flow cytometry?
Propidium Iodide Cell Viability Flow Cytometry Protocol Flow Cytometry Cell Viability Overview Flow cytometry is a quick and reliable method to quantify viable cells. Determining cell viability is an important step when evaluating a cells response to drug treatments or other environmental factors.
Is propidium iodide safe for FACs?
Note: Propidium iodide is a suspected carcinogen and should be handled with care. The dye must be disposed of safely and in accordance with applicable local regulations. Harvest cells and aliquot up to 1 x 10 6 cells/100 μL into FACS tubes.