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Helixyte™ Green Fluorimetric dsDNA Quantitation Kit *Optimized for Microplate Readers*

Comparison of dsDNA dose response using the Helixyte Green™ (blue ) with Invitrogen<sup>TM</sup> Quant-iT™ PicoGreen® dsDNA Reagent (red ). dsNDA standards were incubated in cuvettes and measured using varian cary eclipse fluorescence spectrophotometer. 
Comparison of dsDNA dose response using the Helixyte Green™ (blue ) with Invitrogen<sup>TM</sup> Quant-iT™ PicoGreen® dsDNA Reagent (red ). dsNDA standards were incubated in cuvettes and measured using varian cary eclipse fluorescence spectrophotometer. 
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Catalog Number17650
Unit Size
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Additional ordering information
InternationalSee distributors
ShippingStandard overnight for United States, inquire for international
Spectral properties
Excitation (nm)502
Emission (nm)522
Storage, safety and handling
H-phraseH303, H313, H340
Hazard symbolT
Intended useResearch Use Only (RUO)
R-phraseR20, R21, R68


Excitation (nm)
Emission (nm)
Helixyte™ Green dsDNA Quantitation Assay Kit can be used for selectively detecting as little as 25 pg/ml of dsDNA in the presence of ssDNA, RNA, and free nucleotides. Helixyte™ Green exhibits large fluorescence enhancement upon binding to dsDNA. The assay is linear over three orders of magnitude and has little sequence dependence, allowing you to accurately measure DNA from many sources, including genomic DNA, viral DNA, miniprep DNA, or PCR amplification products. Helixyte™ Green dsDNA Quantitation Assay Kit is a few magnitudes more sensitive than UV absorbance readings. It is specific for dsDNA in the presence of equimolar amounts of RNA. The kit is robust with a mix and read format compatible with 96- and 384-well fluorescence-based microplate readers. It can also be used with a bench top fluorometer or a hand-held fluorescence meter (e.g., Qubit fluorometer).


Fluorescence microplate reader

Excitation490 nm
Emission525 nm
Cutoff515 nm
Recommended plateSolid black


Component A: Helixyte Green™1 vial (100 µL, 200X in DMSO)
Component B: Assay Buffer1 bottle (50 mL)
Component C: Calf thymus DNA Standard1 vial (200 µL, 100 µg/mL)

Example protocol


Protocol summary

  1. Add 100 µL dsDNA standards or test samples
  2. Add 100 µL Helixyte Green™ working solution
  3. Incubate at RT for 5-10 minutes
  4. Monitor the fluorescence at Ex/Em=490/525 nm

Important notes
The following protocol is an example for quantifying dsDNA with Helixyte Green™. Allow all the components to warm to room temperature before opening. No data are available addressing the mutagenicity or toxicity of Helixyte Green™dsDNA stain. Because this reagent binds to nucleic acids, it should be treated as a potential mutagen and handled with appropriate care. The DMSO stock solution should be handled with particular caution as DMSO is known to facilitate the entry of organic molecules into tissues.


dsDNA standard

For convenience, use the Serial Dilution Planner:

Add 10 µL of 100 µg/mL dsDNA stock solution (Component C) to 190 µL of Assay buffer (Component B) to have 5 µg/mL dsDNA solution, and then perform 1:3 serial dilutions to get serially diluted dsDNA standard (DS7 - DS1).


Prepare Helixyte Green™ working solution by adding 50 μL of Helixyte Green™ (Component A) into 10 mL of Assay Buffer (Component B). Protect the working solution from light by covering it with foil or placing it in the dark. Note: We recommend preparing this solution in a plastic container rather than glass, as the dye may adsorb to glass surfaces. For best results, this solution should be used within a few hours of its preparation.


Table 1. Layout of dsDNA standards and test samples in a solid black 96-well microplate. DS= dsDNA Standards (DS1 - DS7, 2.3 to 1667 ng/mL); BL=Blank Control; TS=Test Samples.

DS1 DS1 ... ...
DS2 DS2 ... ...
DS3 DS3    
DS4 DS4    
DS5 DS5    
DS6 DS6    
DS7 DS7    

Table 2. Reagent composition for each well.

Well Volume Reagent
DS1 - DS7 100 µL Serial Dilutions (2.3 to 1667 ng/mL)
BL 100 µL TE
TS 100 µL test sample
  1. Prepare dsDNA standards (DS), blank controls (BL), and test samples (TS) according to the layout provided in Tables 1 and 2. For a 384-well plate, use 25 µL of reagent per well instead of 100 µL.

  2. Add 100 µL of Helixyte Green™ working solution to each well of dsDNA standard, blank control, and test samples to make the total dsDNA assay volume of 200 µL/well. For a 384-well plate, add 25 µL of BLANK assay mixture into each well instead, for a total volume of 50 µL/well.

  3. Incubate the reaction at room temperature for 5 to 10 minutes, protected from light.

  4. Monitor the fluorescence increase with a fluorescence microplate reader at Ex/Em = 490/525 nm (cut off at 515 nm).


Open in Advanced Spectrum Viewer

Spectral properties

Excitation (nm)502
Emission (nm)522


View all 31 references: Citation Explorer
Inhibitors of Streptococcus pneumoniae surface endonuclease EndA discovered by high-throughput screening using a PicoGreen fluorescence assay
Authors: Peterson EJ, Kireev D, Moon AF, Midon M, Janzen WP, Pingoud A, Pedersen LC, Singleton SF.
Journal: J Biomol Screen (2013): 247
Validation of a PicoGreen-based DNA quantification integrated in an RNA extraction method for two-dimensional and three-dimensional cell cultures
Authors: Chen Y, Sonnaert M, Roberts SJ, Luyten FP, Schrooten J.
Journal: Tissue Eng Part C Methods (2012): 444
Characterization of PicoGreen interaction with dsDNA and the origin of its fluorescence enhancement upon binding
Authors: Dragan AI, Casas-Finet JR, Bishop ES, Strouse RJ, Schenerman MA, Geddes CD.
Journal: Biophys J (2010): 3010
Comparison of SYBR Green I-, PicoGreen-, and [3H]-hypoxanthine-based assays for in vitro antimalarial screening of plants from Nigerian ethnomedicine
Authors: Abiodun OO, Gbotosho GO, Ajaiyeoba EO, Happi CT, Hofer S, Wittlin S, Sowunmi A, Brun R, Oduola AM.
Journal: Parasitol Res (2010): 933
Metal-enhanced PicoGreen fluorescence: application to fast and ultra-sensitive pg/ml DNA quantitation
Authors: Dragan AI, Bishop ES, Casas-Finet JR, Strouse RJ, Schenerman MA, Geddes CD.
Journal: J Immunol Methods (2010): 95
Quantification of dsDNA using the Hitachi F-7000 Fluorescence Spectrophotometer and PicoGreen dye
Authors: Moreno LA, Cox KL.
Journal: J Vis Exp. (2010)
Factors affecting quantification of total DNA by UV spectroscopy and PicoGreen fluorescence
Authors: Holden MJ, Haynes RJ, Rabb SA, Satija N, Yang K, Blasic JR, Jr.
Journal: J Agric Food Chem (2009): 7221
Development and characterization of a novel host cell DNA assay using ultra-sensitive fluorescent nucleic acid stain "PicoGreen"
Authors: Ikeda Y, Iwakiri S, Yoshimori T.
Journal: J Pharm Biomed Anal (2009): 997
Enhanced DNA dynamics due to cationic reagents, topological states of dsDNA and high mobility group box 1 as probed by PicoGreen
Authors: Noothi SK, Kombrabail M, Kundu TK, Krishnamoorthy G, Rao BJ.
Journal: FEBS J (2009): 541
Label-free DNA sequence detection with enhanced sensitivity and selectivity using cationic conjugated polymers and PicoGreen
Authors: Ren X, Xu QH.
Journal: Langmuir (2009): 43