The excitation spectra are different from the absorption spectra and all the samples have absorption extended to 200 nm or even shorter. So, the excitation at 200–300 nm range can produce luminescence.
Is cell Titer Glo light sensitive?
The CellTiter-Glo® 2.0 Reagent can be thawed and stored at 2–10°C for up to 2 months with >85% light output remaining when measuring 1µM ATP in a standard reaction. Functional performance of the product is stable at these temperatures for longer, although light output will decline over time.
How does CellTiter Glo work?
The CellTiter-Glo™ Luminescent Cell Viability Assay(a) uses ATP, a required co-factor of the luciferase reaction, as an indicator of metabolically active cells (1–3). The enzyme luciferase acts on luciferin in the presence of Mg2+ and ATP to produce oxyluciferin and to release energy in the form of luminescence (4).
Does phenol red interfere with luminescence?
The luminescence signal also can be affected by changes in temperature or the presence of phenol red and organic solvents (Section 5.B).
How do you measure luminescence?
When a luminescence reaction is set up in a microplate, a luminometer (or luminescence microplate reader), is used to measure the amount of light produced. The microplate is placed in a light-tight read chamber, and light from each well is detected in turn by a PMT. The luminescence readings are expressed as RLU.
How is luminescence calculated?
It states that the intensity of luminescent emission is equal to an exponential value of minus the time of decay divided by the decay time, or L = L0 exp (−t/τ), in which L is the intensity of emission at a time t after an initial intensity L0, and τ is the decay time of the luminescence; that is, the time in which the …
What cellular chemical does the CellTiter Glo assay quantify?
The CellTiter-Glo® 2.0 Assay determines the number of viable cells in culture by quantifying ATP, which indicates the presence of metabolically active cells.
How do I do an MTT assay?
Assay protocol
- Discard media from cell cultures.
- Add 50 µL of serum-free media and 50 µL of MTT solution into each well.
- Incubate the plate at 37°C for 3 hours.
- After incubation, add 150 µL of MTT solvent into each well.
- Wrap plate in foil and shake on an orbital shaker for 15 minutes.
- Read absorbance at OD=590 nm.
Is phenol red the same as phenolphthalein?
I hope that helps! Answer 2: Phenolpthalein is very similar to phenol red. In fact, most of the molecule is identical, except for a small group that dangles off the side of the main structure.
What is luminescence signal?
Luminescence is the emission of light by a substance as a result of a chemical reaction (chemiluminescence) or an enzymatic reaction (bioluminescence). Luminescence detection is optically simpler than fluorescence detection as it does not require a light source or specific optics for excitation.
What is celltiter-Glo® luminescent cell viability assay?
The CellTiter-Glo® Luminescent Cell Viability Assay is a homogeneous method to determine the number of viable cells in culture based on quantitation of the ATP present, which signals the presence of metabolically active cells.
How does the amount of ATP produced by the celltiter-Glo® assay depend on cells?
The amount of ATP is directly proportional to the number of cells present in culture, in agreement with previous reports. The CellTiter-Glo® Assay generates a “glow-type” luminescent signal, produced by the luciferase reaction, which has a half-life of greater than five hours.
How do you measure relative cell growth in DMSO?
Relative cell growth was determined using the Cell Titer Glo assay and is expressed as a percentage of DMSO-treated cells (averages of 3 independent experiments and error bars denote standard deviation). (B) Parental HBL1 and engineered HBL1-CARD11 mutant cells were treated for 5 days with the IKKβ inhibitor AFN700.
