Helix NP™ Blue

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Other Names
Sytox™ Blue
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1_HelixNP_Blue_FC_1_051617
One-day-old C57BL/6 mouse splenocytes were stained with Helix NP™ Blue (filled histogram) at 5nM. Cells alone, without Helix NP™ Blue staining, are also shown (open histogram).
  • 1_HelixNP_Blue_FC_1_051617
    One-day-old C57BL/6 mouse splenocytes were stained with Helix NP™ Blue (filled histogram) at 5nM. Cells alone, without Helix NP™ Blue staining, are also shown (open histogram).
  • 2_Helix_NP_Blue_IF_092517
    HeLa cells were fixed with 1% paraformaldehyde (PFA) for 10 minutes, permeabilized with 0.5% Triton X-100 for 10 minutes, and blocked with 5% FBS for 30 minutes. Then the cells were intracellularly stained with 5 µg/mL of Alexa Fluor® 647 anti-Cytokeratin (pan reactive) (clone C-11) antibody (red) in blocking buffer overnight followed by 25 µM of Helix NP™ Blue (green) and Flash Phalloidin™ Red 594 (blue) staining for 15 minutes at room temperature. The image was captured with a 60X objective using the Alexa Fluor® 488 filter.
  • 3_Helix_NP_Blue_IHC-F_092517
    Mouse frozen cerebellum tissue was fixed with 4% paraformaldehyde (PFA) for 10 minutes, permeabilized with 0.5% Triton X-100 for 10 minutes, and blocked with 5% FBS for one hour. Then the tissue was intracellularly stained with 5 µM of Helix NP™ Blue (blue) 15 minutes at room temperature and co-stained with Flash Phalloidin™ Red (red). The image was captured with a 10X objective using the Alexa Fluor® 488 filter.
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Cat # Size Price Quantity Avail. Save
425305 250 µl $180
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Description

Helix NP™ Blue is a blue-emitting nucleic acid stain. It is impermeant to live cells and thus can be used for the discrimination of live and dead cells. In fixed and permeabilized cells, it can be used to assess cell cycle status.  In immunofluorescence microscopy, it can be used as a nuclear counterstain in cells and tissue. It is optimally excited at 430 nm with an emission at 470 nm, which can be detected in the Brilliant Violet 421™ or Pacific Blue™ channel.

Product Details
Technical data sheet

Product Details

Preparation
Helix NP™ Blue is supplied at 250 µl per vial.
Concentration
5.0 mM
Storage & Handling
Upon receipt, store at -20°C.
Application

FC - Quality tested
ICC, IHC-F - Validated

Recommended Usage

For flow cytometric viability staining, the suggested use of this reagent is 20-200nM. For flow cytometric fixed cell cycle analysis, the suggested use of this reagent is 0.2-20nM. For immunofluorescence microscopy and immunohistochemical staining on frozen tissue sections, the suggested use of this reagent is 2.5-50 μM. It is recommended that the reagent be titrated for optimal performance for each application.

Application Notes

Helix NP™ Blue is a cell-impermeant nucleic acid probe suitable for use as a viability dye and for assessing DNA content and cell cycle status following cell fixation and permeabilization in flow cytometry.  It can also be used for viability in microscopy on live cells or as a nuclear counterstain on fixed and permeabilized cells and tissues. It is a blue-emitting dye with an excitation/emission max of 430 nm/470 nm that can be detected in the Brilliant Violet 421™ or Pacific Blue™ channel.
 

Protocol for viability staining using Helix NP™ Blue: 

  1. Isolate cells following protocol of choice.
  2. Dilute Helix NP™ Blue to required concentration. We recommend titrating the reagent to determine optimal concentration for cells of interest. We have observed good results in flow cytometry at 20-200nM.
  3. Following the addition of Helix NP™ Blue to cells, do not wash, cells are ready for acquisition.
  4. Analyze cells on a cytometer equipped with the 405nm violet laser.


Protocol for fixed cell cycle analysis using Helix NP™ Blue: 

  1. Isolate cells following protocol of choice.
  2. Wash cells twice with phosphate buffered saline (PBS). Using 70% ethanol (EtOH) chilled to -20°C, slowly add to desired cells while vortexing. Following the addition of 70% EtOH, continue vortexing for an additional 30 seconds. Incubate fixed cells in -20°C for a minimum of 1 hour. Prior to staining, wash cells once with phosphate buffered saline (PBS), followed by another wash with Cell Staining Buffer (Cat. No. 420201).
  3. Dilute Helix NP™ Blue to required concentration. We recommend titrating the reagent to determine optimal concentration for cells of interest. We have observed good results in the 0.2-20nM range.
  4. Following the addition of Helix NP™ Blue to cells, do not wash. Cells are ready for acquisition.
  5. Analyze cells on a cytometer equipped with the 405nm laser.


Protocol for nuclear counterstaining fixed and permeabilized cell /tissue specimens using Helix NP™ Blue: 
 

  1. Fix specimens with 1%-4% Paraformaldehyde (PFA) for 10 minutes at room temperature.
    • 1% for cultured cells
    • 4% for frozen tissue
  2. Wash the cells/tissue two times with 1X PBS.
  3. Permeabilize the cells/tissue with 0.5% Triton X-100 for 10 minutes at room temperature.
  4. Wash the cells/tissue two times with 1X PBS.
  5. Block cells with 5% fetal bovine serum for 30 minutes at room temperature.
  6. Complete any additional blocking steps, antibody staining and washes prior to the addition of the Helix NP™ Blue counterstaining.
  7. Prepare the working solution.
    • In initial experiment, it may be the best to try a range of dye concentration to determine optimal concentration for cells/tissues of interest in order to achieve the best image (suggesting range: 2.5 μM -50 μM for IHC-F and 2.5μM -25 μM for IF/ICC).
  8. Stain the cells/tissues with working solution for 20 minutes at 4°C or room temperature in dark.
    • Make sure to protect from light prior to imaging.
    • No wash step needed after staining.
  9. Mount the slides with an antifade medium.
  10. Image slides with a filter ideal for ex/em max of 430nm/470nm (either Alexa 488 or BV510 filter)

Antigen Details

Biology Area
Apoptosis/Tumor Suppressors/Cell Death, Cell Biology, Cell Cycle/DNA Replication, Cell Proliferation and Viability
Gene ID
NA

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Go To Top Version: 1    Revision Date: 05/17/2017

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