CountBright™ Absolute Counting Beads, for flow cytometry
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CountBright™ Absolute Counting Beads, for flow cytometry
Invitrogen™

CountBright™ Absolute Counting Beads, for flow cytometry

CountBright™ absolute counting beads are a calibrated suspension of microspheres that are brightly fluorescent across a wide range of excitationRead more
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Catalog NumberQuantity
C369505 mL
Catalog number C36950
Price (CNY)
3,860.00
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Ends: 31-Dec-2025
5,078.00
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Each
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Quantity:
5 mL
Price (CNY)
3,860.00
Online Exclusive
Ends: 31-Dec-2025
5,078.00
Save 1,218.00 (24%)
Each
Add to cart
CountBright™ absolute counting beads are a calibrated suspension of microspheres that are brightly fluorescent across a wide range of excitation and emission wavelengths (UV to 635 nm excitation and 385-800 nm emission). CountBright™ absolute counting beads are mixed with the cell sample and assayed via flow cytometry. By comparing the ratio of bead events to cell events, absolute numbers of cells in the sample can be calculated. Because CountBright™ beads are mixed in the test sample, absolute cell counts using this single-platform method are more accurate and less complicated than cell concentration determined using multiple-platform testing. CountBright™ absolute counting beads can be used with any sample type, including no-wash/lysed whole blood.

View information about all flow cytometry cell counting beads.
For Research Use Only. Not for use in diagnostic procedures.
Specifications
Detection MethodFluorescence
Diameter (Metric)7 μm
Emissionany lasers (UV to 633/635)
Excitation Wavelength RangeUV to 635/385 to 800 nm
For Use With (Equipment)Flow Cytometer
FormatSolution
No. of Tests100
Quantity5 mL
Shipping ConditionRoom Temperature
Product LineCountBright™
Product TypeCell Counting Bead
Unit SizeEach
Contents & Storage
Contains 1 bottle of CountBright™ absolute counting beads (5 mL). Store in refrigerator (2°C to 8°C) and protect from light.

Frequently asked questions (FAQs)

With the CountBright Plus Absolute Counting Beads/CountBright Absolute Counting Beads, instead of a tight cluster of beads on the scatter plot, I am seeing the beads cover a broad area. What is causing this?

Prior to taking an aliquot, make certain to thoroughly mix the beads. This may also be caused if the beads were ever frozen or the stock solution has any microbial contamination.

Find additional tips, troubleshooting help, and resources within our Cell Analysis Support Center.

Which buffers can I use with the CountBright Plus Absolute Counting Beads and CountBright Absolute Counting Beads?

You may use any physiological buffer or media in a pH range from pH 4 to 10. Avoid extremes of pH and high salt concentrations.

Find additional tips, troubleshooting help, and resources within our Cell Analysis Support Center.

How are CountBright Plus Absolute Counting Beads different from CountBright Absolute Counting Beads?

Here are the differences:

CountBright Plus Absolute Counting Beads:
Bead Size: 4 µm
Excitation Range: 385 - 810 nm
Emission Range: 385 - 860 nm

CountBright Absolute Counting Beads:
Bead Size: 7 µm
Excitation Range: 350 - 635 nm
Emission Range: 350 - 810 nm

Find additional tips, troubleshooting help, and resources within our Cell Analysis Support Center.

When using the Live/Dead BacLight Bacterial Viability and Counting Kit, for flow cytometry, some cells seem to have both red and green signal. Are these cells dead or alive or dying?

The green dye in the kit will label all the cells as it is a cell-permeant nucleic acid stain. The red dye is not cell permeant, and will only stain the cells with compromised membranes (dead cells). Therefore, any cells with red signal will be considered dead. It is possible that you will have some cells that are only red, some that are red and green, and some that are only green. Sometimes the red dye will displace the green dye. In any case, any red cells are dead.

Also, the green dye emission may bleed through into the red channel. Do a single-color staining and examine under both green and red filter sets to determine the level of bleedthrough. To avoid this bleedthrough, use a lower concentration of dye, and, if possible, use narrow bandpass filters.

Find additional tips, troubleshooting help, and resources within our Cell Analysis Support Center.

How can I count my bacteria by flow cytometry?

There are several options. We have two fluorescence based kits that are useful for bacterial counting: Live/Dead BacLight Bacterial Viability and Counting Kit, for flow cytometry (Cat. No. L34856) and Bacteria Counting kit, for flow cytometry (Cat. No. B7277). Another option is the Flow Cytometry Sub-micron Particle Size Reference Kit (Cat. No. F13839).

Find additional tips, troubleshooting help, and resources within our Cell Analysis Support Center.

View all CountBright™ Absolute Counting Beads, for flow cytometry FAQs