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{{chembox {{chembox
| Verifiedfields = changed
| verifiedrevid = 397993112
| Watchedfields = changed
|ImageFile=Resazurin.PNG
| verifiedrevid = 442478011
|ImageSize=200px
| Name =
|IUPACName=7-hydroxy-10-oxidophenoxazin-10-ium-3-one
| ImageFile = Resazurin.PNG
|OtherNames=
| ImageSize =
|Section1= {{Chembox Identifiers
| IUPACName = 7-hydroxy-10-oxidophenoxazin-10-ium-3-one
| CASNo=550-82-3
| OtherNames = Alamar Blue, Vybrant, UptiBlue, diazo-resorcinol, azoresorcin, resazoin, resazurine
| CASOther = <br> (sodium salt)
| SystematicName =
| PubChem=11077
| Section1 = {{Chembox Identifiers
| SMILES=C1=CC2=C(C=C1O)OC3=CC(=O)C=CC3=2
| CASNo_Ref = {{cascite|correct|??}}
| MeSHName=
| CASNo=550-82-3
| CASNo2_Ref = {{cascite|changed|??}}
| CASNo2 = 62758-13-8
| CASNo2_Comment = (sodium salt)
| UNII_Ref = {{fdacite|correct|FDA}}
| UNII = 1FN9YD6968
| PubChem=11077
| ChEMBL_Ref = {{ebicite|changed|EBI}}
| ChEMBL = 1616414
| SMILES=C1=CC2=C(C=C1O)OC3=CC(=O)C=CC3=2
| SMILES_Comment = <ref>{{Cite web | url=http://www.chemspider.com/Chemical-Structure.10606.html | title=Resazurin &#124; C12H7NO4 &#124; ChemSpider}}</ref>
| ChemSpiderID_Ref = {{chemspidercite|changed|chemspider}}
| ChemSpiderID = 10606
| InChI = 1/C12H7NO4/c14-7-1-3-9-11(5-7)17-12-6-8(15)2-4-10(12)13(9)16/h1-6,14H
| InChIKey = PLXBWHJQWKZRKG-UHFFFAOYAB
| StdInChI_Ref = {{stdinchicite|changed|chemspider}}
| StdInChI = 1S/C12H7NO4/c14-7-1-3-9-11(5-7)17-12-6-8(15)2-4-10(12)13(9)16/h1-6,14H
| StdInChIKey_Ref = {{stdinchicite|changed|chemspider}}
| StdInChIKey = PLXBWHJQWKZRKG-UHFFFAOYSA-N
}} }}
|Section2= {{Chembox Properties | Section2 = {{Chembox Properties
| C = 12 | H = 7 | N = 1 | O = 4 | C=12 | H=7 | N=1 | O=4
| Appearance= | Appearance=
| Density= | Density=
| MeltingPt= | MeltingPt=
| BoilingPt= | BoilingPt=
| Solubility = soluble | Solubility = soluble
| Solvent = | Solvent =
| SolubleOther = | SolubleOther =
}} }}
|Section3= {{Chembox Hazards | Section3 = {{Chembox Hazards
| GHSPictograms = {{GHS exclamation mark}}
| MainHazards=
| GHSSignalWord = '''Warning'''
| FlashPt=
| HPhrases = {{H-phrases|315|319|335}}
| Autoignition=
| RPhrases = {{R22}} {{R36/37/38}} | PPhrases = {{P-phrases|261|305+351+338}}
| MainHazards =
| FlashPt =
| AutoignitionPt =
| NFPA-H = 2
| NFPA-F = 1
| NFPA-R = 0
| NFPA-S =
}} }}
| Section4 =
| Section5 =
| Section6 =
}} }}
] assay for cell viability]]
'''Resazurin''' (7-Hydroxy-3''H''-phenoxazin-3-one 10-oxide) is a blue dye, itself nonfluorescent until it is reduced to the pink colored and highly red fluorescent ]. It is used mainly as an oxidation-reduction indicator in cell ]s for bacteria and mammalian cells. Usually it is available commercially as the sodium ].


'''Resazurin''' (7-Hydroxy-3''H''-phenoxazin-3-one 10-oxide) is a ] ] that is weakly ], ], cell-permeable, and redox‐sensitive.<ref>{{cite journal |doi=10.1562/0031-8655(2002)0760385TESIOR2.0.CO2 |title=The Excited-State Interaction of Resazurin and Resorufin with Aminesin Aqueous Solutions. Photophysics and Photochemical Reaction |year=2002 |last1=Bueno |first1=C. |last2=Villegas |first2=M. L. |last3=Bertolotti |first3=S. G. |last4=Previtali |first4=C. M. |last5=Neumann |first5=M. G. |last6=Encinas |first6=M. V. |journal=Photochemistry and Photobiology |volume=76 |issue=4 |pages=385–90 |pmid=12405144|s2cid=222102027 }}</ref><ref>{{Cite journal|last1=Haggerty|first1=Roy|last2=Martí|first2=Eugènia|last3=Argerich|first3=Alba|last4=Schiller|first4=Daniel von|last5=Grimm|first5=Nancy B.|date=2009|title=Resazurin as a "smart" tracer for quantifying metabolically active transient storage in stream ecosystems|journal=Journal of Geophysical Research: Biogeosciences|language=en|volume=114|issue=G3|doi=10.1029/2008JG000942|bibcode=2009JGRG..114.3014H |issn=2156-2202|hdl=10261/38263|hdl-access=free}}</ref> Resazurin has a ] to ] ] above ] 6.5 and an orange color below pH 3.8.<ref>{{Cite web |title=Resazurin, sodium salt |url=https://www.thomassci.com//www.thomassci.com/Chemicals/Substrates/_/Resazurin-sodium-salt4 |access-date=2023-12-10 |website=www.thomassci.com |language=en}}</ref> It is used in ], ], and ] assays because it can be irreversibly ] to the ]-colored and highly fluorescent ] (7-Hydroxy-3''H''-phenoxazin-3-one). At circum-neutral pH, resorufin can be detected by visual observation of its pink color or by ], with an excitation maximum at 530-570&nbsp;nm and an emission maximum at 580-590&nbsp;nm.<ref>Chen, J. L., Steele, T. W., & Stuckey, D. C. (2015). Modeling and application of a rapid fluorescence-based assay for biotoxicity in anaerobic digestion. Environmental science & technology, 49(22), 13463-13471.http://pubs.acs.org/doi/10.1021/acs.est.5b03050</ref>
Resazurin solution has one of the highest values known of Kreft's ] index.<ref>{{cite journal
| author=Kreft S, Kreft M.
| title=
| journal=Journal of the Optical Society of America A
| volume=26
| pages=1576–1581
| year=2009
| doi = 10.1364/JOSAA.26.001576
| bibcode=2009JOSAA..26.1576K
}}</ref> This means that it has a large change in perceived color ] when the thickness or concentration of observed sample increases or decreases.
] assay for cell viability - '''Resazurin''' does not fluoresce when exposed to green light]]
] assay for cell viability - '''Resorufin''' fluoresces when exposed to green light]]


When a solution containing resorufin is submitted to reducing conditions (E<sub>h</sub> < -110 mV), almost all resorufin is reversibly reduced to the ] non-fluorescent ] (also known as hydroresorufin) and the solution becomes translucid (the ] of the resorufin/dihydroresorufin pair is -51 mV vs. ] at pH 7.0). When the E<sub>h</sub> of this same solution is increased, dihydroresorufin is oxidized back to resorufin, and this reversible reaction can be used to monitor if the redox potential of a ] remains at a sufficiently low level for ]s.
==Cell Viability applications==
{{pH_indicator_template
Resazurin was first used to quantify bacterial content in milk by Pesch and Simmert in 1929.<ref>Pesch K. L., Simmert U. (1929). ''Milchw. Forsch''. '''8''', 551</ref>
| indicator_name = Resazurin
It is also used as an indicator for cell viability in mammalian cell cultures.<ref>{{cite journal
| low_pH = 3.8
| author=Anoopkumar-Dukie
| title= | high_pH = 6.5
| low_pH_color = orange
| journal=Br J Radiol
| high_pH_color = #8000FF
| volume=78
| high_pH_text = white
| pages=945–947
}}
| year=2005
| doi = 10.1259/bjr/54004230
| pmid=16177019
| last2=Carey
| first2=JB
| last3=Conere
| first3=T
| last4=O'Sullivan
| first4=E
| last5=Van Pelt
| first5=FN
| last6=Allshire
| first6=A
| issue=934
}}</ref>
It was introduced commercially initially under Alamar Blue trademark (Trek Diagnostic Systems, Inc), and now also available under other names such as AB assay, Vybrant (]) and UptiBlue (]).


Resazurin solution has one of the highest values known of ].<ref>{{cite journal |bibcode=2009JOSAA..26.1576K |title=Quantification of dichromatism: A characteristic of color in transparent materials |last1=Kreft |first1=Samo |last2=Kreft |first2=Marko |volume=26 |year=2009 |pages=1576–81 |journal=Journal of the Optical Society of America A |doi=10.1364/JOSAA.26.001576 |issue=7 |pmid=19568292}}</ref> This means that it has a large change in perceived color ] when the thickness or concentration of observed sample increases or decreases.
Resazurin based assays show excellent correlation to reference viability assays such as ]-based assays (]/XTT) and tritiated thymidine based techniques, while being much easier and safer to use for the user.<ref name=UptiBlue> technical manual</ref> It also allows for longer studies (minimally toxic to living cells), works for adherents cells and bacteria/fungi.<ref name=UptiBlue /> Besides standard applications as ] (cell counting, ] assays) and cytotoxicity testing, it also can be multiplexed with several chemiluminescent assays, such as cytokine assays, caspase assays to measure apoptosis, or reporter assays to measure a gene or a protein expression.<ref name=UptiBlue />

Usually, resazurin is available commercially as the ] ].

==Cell viability applications==
Resazurin is reduced to resorufin by ] of metabolically active cells, and it can be used as an indicator of cell viability. It was first used to quantify bacterial content in milk by Pesch and Simmert in 1929.<ref>{{cite journal |last1=Pesch |first1=K. L. |last2=Simmert |first2=U. |year=1929 |title=Combined assays for lactose and galactose by enzymatic reactions |journal=Milchw. Forsch |volume=8 |pages=551}}</ref> It can be used to detect the presence of viable cells in mammalian cell cultures.<ref>{{cite journal |doi=10.1259/bjr/54004230 |title=Resazurin assay of radiation response in cultured cells |year=2005 |last1=Anoopkumar-Dukie |first1=S |journal=British Journal of Radiology |volume=78 |issue=934 |pages=945–7 |pmid=16177019 |last2=Carey |first2=JB |last3=Conere |first3=T |last4=O'Sullivan |first4=E |last5=Van Pelt |first5=FN |last6=Allshire |first6=A}}</ref> It was introduced commercially initially under Alamar Blue trademark (Trek Diagnostic Systems, Inc), and now also available under other names such as AB assay, Vybrant (]) and UptiBlue (]).

Resazurin based assays show excellent correlation to reference viability assays such as ]-based assays (]/XTT) and tritiated thymidine based techniques.<ref>{{cite journal |vauthors=Gavanji S, Bakhtari A, Famurewa AC, Othman EM |title=Cytotoxic Activity of Herbal Medicines as Assessed in Vitro: A Review |journal=Chemistry & Biodiversity |volume=20 |pages=3–27 |date=January 2023 |issue=2 |pmid=36595710 |doi=10.1002/cbdv.202201098|s2cid=255473013 |doi-access=free }}</ref><ref name=UptiBlue> technical manual</ref> The low toxicity makes it suitable for longer studies, and it has been applied for animal cells, bacteria, and fungi <ref name=UptiBlue /> for ] such as cell counting, cell survival, and ].<ref>{{cite journal |doi=10.1055/s-0031-1298440 |title=Synergy Study of the Inhibitory Potential of Red Wine Polyphenols on Vascular Smooth Muscle Cell Proliferation |year=2012 |last1=Kurin |first1=Elena |last2=Atanasov |first2=Atanas |last3=Donath |first3=Oliver |last4=Heiss |first4=Elke |last5=Dirsch |first5=Verena |last6=Nagy |first6=Milan |journal=Planta Medica |volume=78 |issue=8 |pages=772–8 |pmid=22499559|s2cid=206328057 }}</ref> In antimicrobial assays, resazurin is commonly utilized to assess the ] (MIC) or ] (MBC) of ] agents. <ref>{{cite journal | vauthors = Hossain TJ | title = Methods for screening and evaluation of antimicrobial activity: a review of protocols, advantages and limitations | date = July 2023 | url=https://ssrn.com/abstract=4512752 | journal = Preprint | doi = 10.13140/RG.2.2.33198.48965/1}}</ref>

To take the place of a standard live/dead assay, resazurin also be multiplexed with chemiluminescent assays, such as cytokine assays, caspase assays to measure apoptosis, or reporter assays to measure a gene or a protein expression.<ref name=UptiBlue />

The irreversible reaction of resazurin to ] is proportional to aerobic respiration.<ref>{{cite journal |doi=10.1029/2012JG001965 |title=Measuring aerobic respiration in stream ecosystems using the resazurin-resorufin system |year=2012 |last1=González-Pinzón |first1=Ricardo |last2=Haggerty |first2=Roy |last3=Myrold |first3=David D. |journal=Journal of Geophysical Research |volume=117 |issue=G3 |pages=G00N06|bibcode = 2012JGRG..117.0N06G |url=http://ir.library.oregonstate.edu/xmlui/bitstream/1957/32879/1/GonzalezPinzonRicardoCEOASMeasuringAerobicRespiration.pdf |doi-access=free }}</ref>

{{Gallery
|Image:Resazurin assay for mammalian cell viability.JPG|Resazurin as a ] assay for cell viability
|Image:Resazurin assay - Resazurin does not fluoresce.JPG|Resazurin used as a ] assay for cell viability - '''Resazurin''' does not fluoresce when exposed to green light
|Image:Resazurin assay - Resorufin fluoresces.JPG|Resazurin as a ] assay for cell viability - '''Resorufin''' fluoresces when exposed to green light
}}

=== Resazurin reduction test ===
Resazurin can be used as one of a series of rapid tests to determine the quality of a milk sample. In this test, resazurin is added as a violet redox dye which turns mauvish-pink due to conversion to resorufin and then to colourless dihydroresorufin. This happens due to lowering of the ] in the milk sample caused by presence of bacteria which utilize available oxygen present in the milk for ]. The rate of the colour change is used as an index for the number of bacteria present in the milk sample.<ref>{{Cite book|first=Batt, Carl A.|last=Tortorello, Mary Lou|url=http://worldcat.org/oclc/1049639465|title=Encyclopedia of food microbiology|date=2 April 2014 |publisher=Academic Press |isbn=978-0-12-384733-1|oclc=1049639465}}</ref>


==Other applications== ==Other applications==
]
Resazurin is effectively reduced in ], making it useful also to assess ''']l ] activity'''.
Resazurin is effectively reduced in ], making it useful also to assess ]l ] activity.


Usually, in the presence of ] or ] as the enzyme, ] or ] is the reductant that converts resazurin to resorufin. Hence the resazurin/diaphorase/NADPH system can be used to detect NADH, NADPH, or diaphorase level, and any biochemical or enzyme activity that is involved in a biochemical reaction generating NADH or NADPH.<ref>{{cite journal |doi=10.1093/jat/8.6.273 |title=An Enzymatic Method for the Analysis of Formate in Human Plasma |year=1984 |last1=Shahangian |first1=S. |last2=Ash |first2=K. O. |last3=Rollins |first3=D. E. |journal=Journal of Analytical Toxicology |volume=8 |issue=6 |pages=273–6 |pmid=6549198}}</ref><ref>{{cite journal |pmid=6571720 |year=1983 |last1=Hanson |first1=NQ |last2=Freier |first2=EF |title=Effect of protein on the determination of total bile acids in serum |volume=29 |issue=1 |pages=171–5 |journal=Clinical Chemistry |doi=10.1093/clinchem/29.1.171 |url=http://www.clinchem.org/cgi/pmidlookup?view=long&pmid=6571720|doi-access=free }}</ref><ref>{{cite journal |doi=10.1016/0005-2744(77)90081-X |title=Fluorimetric assay of tobacco leaf dehydrogenases with resazurin |year=1977 |last1=De Jong |first1=Donald W. |last2=Woodlief |first2=William G. |journal=Biochimica et Biophysica Acta (BBA) - Enzymology |volume=484 |issue=2 |pages=249–59 |pmid=20957}}</ref><ref>{{cite journal |doi=10.1016/0009-8981(80)90442-8 |title=Stoichiometry of the nadh-oxidoreductase reaction for dehydrogenase determinations |year=1980 |last1=Barnes |first1=Stephen |last2=Spenney |first2=Jerry G. |journal=Clinica Chimica Acta |volume=107 |issue=3 |pages=149–54 |pmid=6893684}}</ref><ref>{{cite journal |pmid=6894889 |year=1980 |last1=Winartasaputra |first1=H |last2=Mallet |first2=VN |last3=Kuan |first3=SS |last4=Guilbault |first4=GG |title=Fluorometric and colorimetric enzymic determination of triglycerides (triacylglycerols) in serum |volume=26 |issue=5 |pages=613–7 |journal=Clinical Chemistry |doi=10.1093/clinchem/26.5.613 |url=http://www.clinchem.org/cgi/pmidlookup?view=long&pmid=6894889|doi-access=free }}</ref>
Usually, in the presence of ] as the enzyme, ] or ] is the reductant that converts resazurin to resorufin. Hence the '''resazurin/diaphorase/NADPH system''' can be used to detect NADH, NADPH, or diaphorase level, and any biochemical or enzyme activity that is involved in a biochemical reaction generating NADH or NADPH.<ref>J. Anal. Toxicol. 8, 273(1984); Clin. Chem. 29, 171(1983); Biochem. Biophys. Acta 484, 249(1977); Clin. Chim. Acta 107, 149(1980); Clin. Chem. 26, 613(1980)</ref>


Resazurin can be used to '''assay ]''', achieving a sensitivity of 2.0 pmol per well.<ref>Analytica Chimica Acta, Volume 402, Issues 1-2, 3 December 1999, Pages 47-52. </ref> Resazurin can be used to assay ], achieving a sensitivity of 2.0 pmol per well in a 96 well plate.<ref>{{cite journal |doi=10.1016/S0003-2670(99)00533-4 |title=Microplate-based fluorometric methods for the enzymatic determination of l-glutamate: application in measuring l-glutamate in food samples |year=1999 |last1=Chapman |first1=Justin |last2=Zhou |first2=Mingjie |journal=Analytica Chimica Acta |volume=402 |issue=1–2 |pages=47–52|bibcode=1999AcAC..402...47C }}</ref>


Resazurin can also be used to measure the aerobic biodegradation of organic matter found in effluents.<ref>{{cite journal|last1=Jouanneau|first1=S.|last2=Recoules|first2=L.|last3=Durand|first3=M.J|last4=Boukabache|first4=A.|last5=Picot|first5=V.|last6=Primault|first6=Y.|last7=Lakel|first7=A.|last8=Sengelin|first8=M.|last9=Barillon|first9=B.|last10=Thouand|first10=G.|title=Methods for assessing biochemical oxygen demand (BOD): A review|journal=Water Research|date=2014|volume=49|pages=62–82|doi=10.1016/j.watres.2013.10.066|pmid=24316182|bibcode=2014WatRe..49...62J |url=https://hal.science/hal-01929273/file/Methods%20for%20assessing%20biochemical%20oxygen%20demand.pdf }}</ref>
==Close dyes==
'''10-acetyl-3,7-dihydroxyphenoxazine''' (also known as Amplex Red), structurally related to resazurin, reacts with H2O2 in a 1:1 stoichiometry to produce the same by-product resorufin (used in many assays combining for example ] (HRP), or NADH, NADPH using enzymes).


Resazurin is used to measure the amount of aerobic respiration in streams.<ref>{{cite journal |doi=10.1029/2008JG000942 |title=Resazurin as a 'smart' tracer for quantifying metabolically active transient storage in stream ecosystems |year=2009 |last1=Haggerty |first1=Roy |last2=Martí |first2=Eugènia |last3=Argerich |first3=Alba |last4=Von Schiller |first4=Daniel |last5=Grimm |first5=Nancy B. |authorlink5=Nancy Grimm|journal=Journal of Geophysical Research |volume=114 |issue=G3 |pages=G03014|bibcode = 2009JGRG..114.3014H |hdl=10261/38263 |hdl-access=free }}</ref> Since most aerobic respiration occurs in the stream bed, the conversion of resazurin to resorufin is also a measure of the amount of exchange between the water column and the stream bed.
'''7-ethoxyresorufin''', is a compound used as the substrate in the measurement of ] (]) induction using the ] (EROD) assay system in cell culture and environmental samples, produced in response to exposure to ]. The compound is catalysed by the enzyme to produce the same fluorescent product, resorufin.

==Synthesis==
Resazurin is prepared by acid-catalyzed condensation between ] and 4-nitrosoresorcinol followed by oxidation of the intermediate with ]:
]
Treatment of the crude reaction product with excess ] yields the sodium salt of resazurin, which is typically the commercial form of the dye. Running the condensation step in alcohols is possible but results in lower yields of the product; in pure water or acetic acid, the reaction does not proceed satisfactorily.<ref name=Resazurin_synthesis_patent>{{ cite patent |country=US |number=2376283 A |title=Dyestuffs suitable for use as indicators |pubdate=1945-05-15 |fdate=1943-04-06 |pridate=1942-04-03 |invent1=Frank Short Wallace |invent2=Peter Oxley |assign1= Boots Pure Drug Co Ltd}}</ref>

==Related dyes==
'''10-acetyl-3,7-dihydroxyphenoxazine''' (also known as Amplex Red), structurally related to resazurin, reacts with H<sub>2</sub>O<sub>2</sub> in a 1:1 stoichiometry to produce the same by-product resorufin (used in many assays combining for example ] (HRP), or NADH, NADPH using enzymes).<ref>{{cite journal | last1 = Zhou | first1 = M. | last2 = Diwu | first2 = Z. | last3 = Panchuk-Voloshina | first3 = N. | last4 = Haugland | first4 = R.P. | title = A stable nonfluorescent derivative of resorufin for the fluorometric determination of trace hydrogen peroxide: Applications in detecting the activity of phagocyte NADPH oxidase and other oxidases | journal = Anal Biochem | volume = 253 | issue = 2 | pages = 162–168 | date = 1997 | doi = 10.1006/abio.1997.2391 | pmid = 9367498}}</ref>

'''7-ethoxyresorufin''', a compound used as the substrate in the measurement of ] (]) induction using the ] (EROD) assay system in cell culture and environmental samples, produced in response to exposure to ]. The compound is catalysed by the enzyme to produce the same fluorescent product, resorufin.<ref>{{cite journal | title = Assay for quantitative determination of CYP1A1 enzyme activity using 7-Ethoxyresorufin as standard substrate (EROD assay) | last = Mohammadi-Bardbori | first = Afshin | doi = 10.1038/protex.2014.043 | date = 2014 | journal = Protocol Exchange | volume = 10 | number = 5 | publisher = Research Square| doi-access = free }}</ref><ref>{{cite book | chapter = Enzymatic Analysis of cDNA-Expressed Human CYP1A1, CYP1A2, and CYP1B1 With 7-Ethoxyresorufin as Substrate | title = Cytochrome P450 Protocols | edition = 2nd | editor-last1 = Phillips | editor-first1 = I.R. | editor-last2 = Shephard | editor-first2 = E.A. | isbn = 9781588294418 | date = 2005 | last1 = Chang | first1 = Thomas K.H. | last2 = Waxman | first2 = David J. | pages = 85–90 | pmid = 16719376 | doi = 10.1385/1-59259-998-2:85 | chapter-url = https://link.springer.com/protocol/10.1385%2F1-59259-998-2%3A85 | url = https://link.springer.com/book/10.1385/1592599982 | series = Methods in Molecular Biology | volume = 320}}</ref>

'''1,3-dichloro-7-hydroxy-9,9-dimethylacridin-2(9''H'')-one''' (DDAO dye), a fluorescent dye used for oligonucleotide labeling.<ref>{{cite journal | title = Extracellular DNA is abundant and important for microcolony strength in mixed microbial biofilms | last1 = Dominiak | first1 = D.M. | last2 = Nielsen | first2 = J.L. | last3 = Nielsen | first3 = P.H. | date = 2010 | journal = Environmental Microbiology | doi = 10.1111/j.1462-2920.2010.02375.x | volume = 13 | issue = 3 | pages = 710–721 | pmid = 21118344 | url = https://sfamjournals.onlinelibrary.wiley.com/doi/full/10.1111/j.1462-2920.2010.02375.x}}</ref>


== References == == References ==
{{reflist}}
<references/>


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