Cat. No.: HY-D0259

Erythrosine B

Name: Erythrosine B
Brand: MedChemExpress
SKU: HY-D0259
Price: 60.00 USD
Availability: InStock
Rating: 5 (1 reviews)

(Synonyms: Erythrosin extra bluish; Tetraiodofluorescein disodium)

Customer Review

Based on 1 Customer Validation

Erythrosine B (Erythrosin extra bluish; Tetraiodofluorescein) is a visible red dye and insecticide with colorimetric and fluorescent properties. Erythrosine B serves as a membrane-impermeant live-cell dye for Gram-positive and Gram-negative bacteria, primarily staining dead cells with damaged plasma membranes. Erythrosine B exhibits photosensitive larvicidal toxicity against Culex pipiens quinquefasciatus larvae. Erythrosine B is used in live/dead bacterial assays in colorimetric and fluorescent measurements for low-, medium-, and high-throughput experiments, as well as in research related to mosquito-borne diseases and food coloring.

For research use only. We do not sell to patients.

Purity : 98.0%
CAS No.: 16423-68-0
Formula: C₂₀H₆I₄Na₂O₅
Molecular Weight:879.86

Storage:

4°C, sealed storage, away from moisture and light

* In solvent : -80°C, 6 months; -20°C, 1 month (sealed storage, away from moisture and light)

Erythrosine B Chemical Structure

CAS No.: 16423-68-0

Size

Price

Stock

Quantity

Amount: USD 0.00

* Please select Quantity before adding items.

Top Publications Citing

Use of MCE Products

Fluorescent Dye

Strong Fluorescence Signal / Multi-Disciplinary Applications / High Fluorescence Specificity

Biological Activity
- Description
- In Vitro
- In Vivo
Chemical Information
Solvent & Solubility
- In Vitro
Purity & Documentation
References
Help & FAQs
Classifications
Bioz

Biological Activity

Description

In Vitro

Erythrosine B (0.8%; 5 min) is a membrane-impermeant live-cell dye that selectively stains dead or membrane-damaged Gram-positive and Gram-negative bacteria^[2].
Erythrosine B shows a linear correlation between its absorbance at 530 nm and the proportion of dead cells in E. coli, K. pneumoniae, and P. mirabilis populations, enabling microplate-based quantitative colorimetric viability detection^[2].
Erythrosine B (5 min) is a fluorescent viability dye detectable by flow cytometry that distinguishes live from dead cells across multiple bacterial species and tracks the time-dependent increase in cell death in sodium azide-treated cultures of S. marcescens^[2].
Erythrosine B preferentially binds to the N-terminus of Aβ₄₀ monomer (PDB 1BA4) with a binding free energy of 20.15 kcal mol^-1, disrupts the Asp23-Lys28 salt bridge, and preserves the α-helical structure of residues 13-16 in the PDB 2LFM conformation. At a 2:1 ratio to Aβ₄₀, it further stabilizes the C-terminal α-helix by excluding water molecules, thereby inhibiting the conformational transition to the aggregation-prone β-sheet structure^[4].

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

In Vivo

Erythrosine B (0.25-12 ppm; added to rearing water for larval ingestion; fed approximately 15 min before light exposure; light exposure up to 24 h) exhibits concentration-dependent and light duration-dependent larvicidal activity against fourth-instar Culex pipiens quinquefasciatus, with a 24 h LC₅₀ of 2.45 ppm, while the addition of 8% SDS enhances toxicity approximately 3-fold, reducing the LC₅₀to 0.66 ppm^[3].
Erythrosine B (0.25-4 ppm; added to rearing water for larval ingestion; 24-h dark feeding period prior to light exposure; light exposure duration up to 24 h) exhibits approximately 16-fold greater larvicidal efficacy against fourth-instar Culex pipiens quinquefasciatus compared with conditions without dark pre-incubation^[3].

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

Animal Model:

fourth-instar larvae (laboratory colony)^[3]
Dosage:

0.25 ppm, 0.5 ppm, 1 ppm, 2 ppm, 4 ppm, 8 ppm, 12 ppm
Administration:

added to rearing water for larval ingestion; ~15 min feeding before light exposure; up to 24 h light exposure
Result:

Showed LC₅₀ values of 9.05 ppm at 3 h, 7.81 ppm at 4 h, 6.61 ppm at 5 h, 5.89 ppm at 6 h, 5.44 ppm at 7 h, and 2.45 ppm at 24 h of light exposure.
Exhibited LT₅₀ values of 7.76 h at 4 ppm, 6.73 h at 8 ppm, and 2.50 h at 12 ppm.
Demonstrated greater toxicity and faster action than fluorescein and both 1:1 and 1:3 nondispersible coprecipitated combinations.
When 8% SDS was added, the results showed LC₅₀ values of 6.86 ppm at 0.5 h, 3.89 ppm at 1 h, 2.52 ppm at 2 h, 2.06 ppm at 3 h, 1.84 ppm at 4 h, 1.66 ppm at 5 h, 1.59 ppm at 6 h, 1.48 ppm at 7 h, and 0.66 ppm at 24 h of light exposure; LT₅₀ values of 25.05 h at 0.5 ppm, 13.87 h at 1 ppm, 5.65 h at 2 ppm, 2.15 h at 4 ppm, 1.02 h at 5 ppm, and 0.49 h at 6 ppm; and approximately 3-fold greater toxicity than the nondispersible formulation after 24 h of light exposure.

Animal Model:

fourth-instar larvae (laboratory colony)^[3]
Dosage:

0.25 ppm, 0.50 ppm, 1 ppm, 2 ppm, 4 ppm
Administration:

added to rearing water for larval ingestion; 24-h dark feeding period before light exposure; up to 24 h light exposure
Result:

Showed LC₅₀ values of 1.69 ppm at 0.75 h, 1.19 ppm at 1 h, 0.27 ppm at 2 h, 0.20 ppm at 3 h, and 0.14 ppm at 4 h of light exposure.
Exhibited LT₅₀ values of 2.54 h at 0.25 ppm, 1.95 h at 0.50 ppm, 1.08 h at 1 ppm, 0.76 h at 2 ppm, and 0.66 h at 4 ppm.
Increased toxic effect by about 16-fold relative to the dispersible formulation without dark preincubation.
Shortened the time required to kill 50% of test larvae.

Chemical Information

CAS No. 16423-68-0
Appearance Solid
Molecular Weight 879.86
Formula C₂₀H₆I₄Na₂O₅
Color Pink to red
SMILES

O=C1OC2(C3=C(OC4=C2C=C(I)C(O[Na])=C4I)C(I)=C(O[Na])C(I)=C3)C5=C1C=CC=C5
Synonyms

Erythrosin extra bluish; Tetraiodofluorescein disodium
Shipping

Room temperature in continental US; may vary elsewhere.
Storage

4°C, sealed storage, away from moisture and light

* In solvent : -80°C, 6 months; -20°C, 1 month (sealed storage, away from moisture and light)

Solvent & Solubility

In Vitro:

H₂O : 33.33 mg/mL (37.88 mM; Need ultrasonic)

DMSO : 33.33 mg/mL (37.88 mM; Need ultrasonic; Hygroscopic DMSO has a significant impact on the solubility of product, please use newly opened DMSO)

View the Complete Stock Solution Preparation Table

Preparing Stock Solutions

View the Complete Stock Solution Preparation Table

Concentration Solvent Mass

1 mg

5 mg

10 mg

Concentration

Solvent

Mass

1 mM

1.1365 mL

5.6827 mL

11.3654 mL

5 mM

0.2273 mL

1.1365 mL

2.2731 mL

10 mM

0.1137 mL

0.5683 mL

1.1365 mL

Please refer to the solubility information to select the appropriate solvent. Once prepared, please aliquot and store the solution to prevent product inactivation from repeated freeze-thaw cycles.

Storage method and period of stock solution: -80°C, 6 months; -20°C, 1 month (sealed storage, away from moisture and light). When stored at -80°C, please use it within 6 months. When stored at -20°C, please use it within 1 month.

* Note: If you choose water as the stock solution, please dilute it to the working solution, then filter and sterilize it with a 0.22 μm filter before use.

Molarity Calculator

Mass (g) = Concentration (mol/L) × Volume (L) × Molecular Weight (g/mol)

Mass Mass

Concentration Concentration

Volume Volume

Molecular Weight Molecular Weight

Dilution Calculator

Concentration _(start) × Volume _(start) = Concentration _(final) × Volume _(final)

Concentration _(start) Concentration _(start)

Volume _(start) Volume _(start)

Concentration _(final) Concentration _(final)

Volume _(final) Volume _(final)

Purity & Documentation

Select Batch:

Purity: 99.98%

Assay: 99.98%

ee.: 99.98%

Data Sheet (296 KB)
SDS (393 KB)
- English - EN (393 KB)
- Français - FR (393 KB)
- Deutsch - DE (393 KB)
- Norwegian - NO (393 KB)
- Español - ES (393 KB)
- Swedish - SV (393 KB)
- Italian - IT (393 KB)
- Korean - KR (393 KB)
- Portuguese - PT (393 KB)
COA (2659 KB)
Elemental Analysis Report (2659 KB)
HNMR (2659 KB)
CNMR (2659 KB)
RP-HPLC (2659 KB)
NP-HPLC (2659 KB)
MS (2659 KB)
LCMS (2659 KB)
IR (2659 KB)
GC (2659 KB)
OR (2659 KB)
SDS-PAGE (2659 KB)
SEC-HPLC (2659 KB)
Other Report (2659 KB)
Handling Instructions (2659 KB)

References

[1]. Andersen C J, et al. False elevation of serum protein-bound-iodine caused by red colored drugs or foods[J]. Scandinavian Journal of Clinical and Laboratory Investigation, 1964, 16(2): 249-249.

[2]. Franke JD, et al. Erythrosin B: a versatile colorimetric and fluorescent vital dye for bacteria. BioTechniques. 2020 Jan;68(1):7-13. [Content Brief]

[3]. Respicio NC, et al. The joint action of coprecipitated free-acid formulations of erythrosin B and fluorescein against the larvae of Culex pipiens quinquefasciatus Say (Diptera: Culicidae). J Econ Entomol. 1985 Feb;78(1):30-4.

[4]. Lee J, et al. Investigation of the effect of erythrosine B on amyloid beta peptide using molecular modeling. Journal of molecular modeling. 2016 Apr;22(4):92.

Help & FAQs

How should lyophilized recombinant proteins be reconstituted and stored?

1. Before opening the cap, centrifuge the vial at 13000 rpm for 20-30 seconds. This step will ensure that any lyophilized powder that may have adhered to the cap or walls is collected at the bottom of the vial, minimizing the risk of product loss.

Complete Stock Solution Preparation Table

Optional Solvent	Concentration Solvent Mass	1 mg	5 mg	10 mg	25 mg
H₂O / DMSO	1 mM	1.1365 mL	5.6827 mL	11.3654 mL	28.4136 mL
	5 mM	0.2273 mL	1.1365 mL	2.2731 mL	5.6827 mL
	10 mM	0.1137 mL	0.5683 mL	1.1365 mL	2.8414 mL
	15 mM	0.0758 mL	0.3788 mL	0.7577 mL	1.8942 mL
	20 mM	0.0568 mL	0.2841 mL	0.5683 mL	1.4207 mL
	25 mM	0.0455 mL	0.2273 mL	0.4546 mL	1.1365 mL
	30 mM	0.0379 mL	0.1894 mL	0.3788 mL	0.9471 mL

* Note: If you choose water as the stock solution, please dilute it to the working solution, then filter and sterilize it with a 0.22 μm filter before use.

Product Name:
Cat. No.:
Quantity:
MCE Japan Authorized Agent:

Product Name:
CAS No.:
Species:
Purity:
Quantity:

Erythrosine B