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70540

Sigma-Aldrich

Naphthol Yellow S

for microscopy (Hist.)

Synonym(s):

2,4-Dinitro-1-naphthol-7-sulfonic acid sodium salt, 5,7-Dinitro-8-hydroxy-2-naphthalenesulfonic acid sodium salt, Acid Yellow 1, Flavianic acid sodium salt

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About This Item

Empirical Formula (Hill Notation):
C10H4N2Na2O8S
CAS Number:
846-70-8
Molecular Weight:
358.19
Colour Index Number:
10316
Beilstein/REAXYS Number:
3839220
EC Number:
212-690-2
MDL number:
MFCD00003958
UNSPSC Code:
12171500
PubChem Substance ID:
329762555
NACRES:
NA.47

grade

for microscopy (Hist.)

Quality Level

200

form

powder

solubility

methanol: water (1:1): 0.5 g/10 mL, clear

εmax

≥275 at 423-433 nm in water
≥≥ 250 at 387-397 nm in water

application(s)

diagnostic assay manufacturing
hematology
histology

storage temp.

room temp

SMILES string

[Na+].[Na+].[O-]c1c(cc([N+]([O-])=O)c2ccc(cc12)S([O-])(=O)=O)[N+]([O-])=O

InChI

1S/C10H6N2O8S.2Na/c13-10-7-3-5(21(18,19)20)1-2-6(7)8(11(14)15)4-9(10)12(16)17;;/h1-4,13H,(H,18,19,20);;/q;2*+1/p-2

InChI key

CTIQLGJVGNGFEW-UHFFFAOYSA-L

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Application

Naphthol yellow S has been used as a staining agent in fixed human embryonic stem cell-derived cardiomyocytes.

Biochem/physiol Actions

Naphthol yellow S (NYS) is used as a stain for protein basic groups. It is an acidic dye and forms a NYS-protein complex at acidic pH. Combination of feulgen and NYS provides DNA to protein ratio.

Analysis Note

λmax. ∼428 nm/∼392 nm; E(1%,1 cm) ∼275-425/∼250-400 (H2O)

pictograms

Health hazardExclamation mark
GHS08,GHS07

signalword

Warning

hcodes

H317,H373

Hazard Classifications

Skin Sens. 1 - STOT RE 2

Storage Class

11 - Combustible Solids

wgk_germany

WGK 2

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Gloves, type N95 (US)

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Certificates of Analysis (COA)

Lot/Batch Number
276745/1

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Scholtissek C, et al.
Chemistry and Cytochemistry of Nucleic Acids and Nuclear Proteins (2012)
N W Schipper et al.
Laboratory investigation; a journal of technical methods and pathology, 61(2), 228-234 (1989-08-01)
The paper describes an improved segmentation method to measure the percentages of epithelium and stroma in ovarian (tumor) tissue with automated image analysis and evaluates its prognostic value. In the image processing method, a blue-yellow image pair is recorded from
Brodsky VYa et al.
European journal of histochemistry : EJH, 37(3), 199-206 (1993-01-01)
Two-wavelength scanning cytophotometry was performed for the measurement of DNA (Feulgen reaction) and total protein content (naphthol yellow S staining) in the same cardiac myocyte. A lack of proportionality between the DNA content (i.e, cell ploidy) and protein content has
Cell and Tissue Culture in Forestry (2012)
J Tas et al.
The Histochemical journal, 13(5), 711-716 (1981-09-01)
The 'total protein staining' of biological specimens with the electrostatically binding Naphthol Yellow S or the covalently binding dinitrofluorobenzene must be interpreted as methods which yield data on the specific amino acid pool of the proteins concerned. Both dyes bind
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