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In Situ Cell Death Detection Kit, Fluorescein

sufficient for ≤50 tests, suitable for detection


sufficient for ≤50 tests

Quality Level





shipped in

dry ice

storage temp.


General description

Kit for the detection and quantification of apoptosis at the single-cell level, based on labeling of DNA strand breaks (TUNEL technology); analysis by fluorescence microscopy or flow cytometry.
Widely used methods to determine apoptosis include the analysis of the genomic DNA by agarose-gel electrophoresis and DNA fragmentation assays based on 3H-thymidine and, alternatively, 5-Bromo-2′-deoxy-uridine. The methods involve the separation of fragmented, low molecular weight DNA from unfragmented, high molecular weight DNA in a given cell population. Thus, these methods do not provide information about the fate of an individual cell in a given cell population, or particularly, in tissue sections. Alternatively, individual apoptotic cells may be microscopically recognized because of the characteristic appearance of nuclear chromatin condensation and fragmentation, but this method is subjective and limited to a relatively narrow time window when the morphological changes are at a maximum.
The hallmark of apoptosis is DNA degradation, which in early stages, is selective to the internucleosomal DNA linker regions. The DNA cleavage may yield double-stranded and single-stranded DNA breaks (nicks). Both types of breaks can be detected by labeling the free 3′-OH termini with modified nucleotides (e.g., biotin-dUTP, DIG-dUTP, fluorescein-dUTP) in an enzymatic reaction. The enzyme terminal deoxynucleotidyl transferase (TdT) catalyzes the template-independent polymerization of deoxyribonucleotides to the 3′-end of single- and double-stranded DNA. This method has also been termed TUNEL (TdT-mediated dUTP-X nick end labeling). Alternatively, free 3′-OH groups may be labeled using DNA polymerases by the template-dependent mechanism called nick translation. However, the TUNEL method is considered to be more sensitive and faster.


The TUNEL reaction preferentially labels DNA strand breaks generated during apoptosis. This allows discrimination of apoptosis from necrosis and from primary DNA strand breaks induced by cytostatic drugs or irradiation.


The In Situ Cell Death Detection Kit, Fluorescein,  is a precise, fast, and simple nonradioactive technique to detect and quantify apoptotic cell death at the single-cell level by fluorescence microscopy and quantitative detection by flow cytometry in cells and tissues. Thus, the In Situ Cell Death Detection Kit can be used in many different assay systems.
Examples are:
  • Detection of individual apoptotic cells in frozen and formalin-fixed tissue sections in basic research
  • Determination of sensitivity of malignant cells to drug-induced apoptosis in cancer research
  • Typing of cells undergoing cell death in heterogeneous populations by double staining procedures

Features and Benefits

  • Sensitive: The direct labeling procedure using fluorescein-dUTP reduces background labeling
  • Fast: The use of fluorescein-dUTP allows analysis of the samples directly after the TUNEL reaction
  • Convenient: No secondary detection system required
  • Accurate: Identification of apoptosis at a molecular level (DNA-strand breaks) and identification of cells at the very early stages of apoptosis


1 kit containing 2 components.

Preparation Note

Working solution: Add total volume (50 μl) of Enzyme Solution to the remaining 450 μl Label Solution to obtain 500 μl TUNEL reaction mixture.
Mix well to equilibrate components.

Other Notes

For life science research only. Not for use in diagnostic procedures.

Kit Components Only

Product No.

  • Enzyme Solution (TdT)

  • Label Solution (fluorescein-dUTP)


Health hazardEnvironment

Signal Word


Hazard Statements

Hazard Classifications

Aquatic Chronic 2 - Carc. 1B Inhalation

Storage Class Code

6.1D - Non-combustible, acute toxic Cat.3 / toxic hazardous materials or hazardous materials causing chronic effects



Flash Point(F)

does not flash

Flash Point(C)

does not flash

Certificate of Analysis

Certificate of Origin

Quotes and Ordering

Zengxia Li et al.
Biologics : targets & therapy, 1(4), 455-463 (2007-12-01)
Medullary thyroid carcinoma (MTC), a neuroendocrine tumor arising from the thyroid gland, is known to be poorly responsive to conventional chemotherapy. The root of Stemona tuberosa Lour, also called Bai Bu, is a commonly used traditional Chinese anti-tussive medicine. The
Gerald A Matchett et al.
Brain research, 1136(1), 200-207 (2007-01-11)
Granulocyte-colony stimulating factor (G-CSF) is an endogenous peptide hormone of the hematopoietic system that has entered Phase I/II clinical trials for treatment of ischemic stroke. Severe intraoperative hypotension can lead to global cerebral ischemia and apoptotic neuron loss within the
A García-Peiró et al.
International journal of andrology, 34(6 Pt 2), e546-e553 (2011-05-04)
This investigation was conducted to assess the baseline level of sperm DNA fragmentation (SDF) in a cohort of patients presenting chromosomal rearrangements (nine reciprocal translocations and two inversions). In a separate experiment, a dynamic analysis to calculate the rate of
Mónica Ramírez et al.
Molecular vision, 15, 713-721 (2009-04-15)
Postnatal retinal Müller glia are considered to be retinal progenitors as they retain the ability to dedifferentiate, proliferate, and differentiate to new retinal glia and neurons after injury. The proliferation and differentiation processes are coordinated by several extrinsic factors and
Duncan B Sparrow et al.
Journal of the American Society of Nephrology : JASN, 20(4), 777-786 (2009-03-20)
A number of studies have shown that placental insufficiency affects embryonic patterning of the kidney and leads to a decreased number of functioning nephrons in adulthood; however, there is circumstantial evidence that placental insufficiency may also affect renal medullary growth


Apoptosis Assays

Cellular apoptosis assays to detect programmed cell death using Annexin V, Caspase and TUNEL DNA fragmentation assays.

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

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