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63184

Sigma-Aldrich

5-Maleimido-eosin

for fluorescence, ≥93% (HPLC)

Synonym(s):

EMA, Eosin-5-maleimide

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About This Item

Empirical Formula (Hill Notation):
C24H9Br4NO7
CAS Number:
150322-02-4
Molecular Weight:
742.95
MDL number:
MFCD07437936
UNSPSC Code:
12352207
PubChem Substance ID:
329759808
NACRES:
NA.32

grade

for fluorescence

Quality Level

100

Assay

≥93% (HPLC)

fluorescence

λex 524 nm; λem 545 nm (after derivatization with 2-mercaptoethanol)

storage temp.

2-8°C

SMILES string

Oc1c(Br)cc2c(Oc3c(Br)c(O)c(Br)cc3C24OC(=O)c5cc(ccc45)N6C(=O)C=CC6=O)c1Br

InChI

1S/C24H9Br4NO7/c25-13-6-11-21(17(27)19(13)32)35-22-12(7-14(26)20(33)18(22)28)24(11)10-2-1-8(5-9(10)23(34)36-24)29-15(30)3-4-16(29)31/h1-7,32-33H

InChI key

YRCLWXRIEYQTAV-UHFFFAOYSA-N

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General description

5-Maleimido-eosin, also known as EMA or Eosin-5-maleimide, is a fluorescent binding agent. The 5-Maleimido-eosin binding test measures the EMA-labeled cells reduced mean channel fluorescence (MCF) reading.

Application

Eosin-5-maleimide has been used as a fluorescent probe for the human erythrocyte band 3 protein. It is widely used as a diagnostic probe for the laboratory detection of hereditary spherocytosis (HS) by flow cytometry. The eosin-5-maleimide binding test was done to analyze the effect of alectinib (first line of treatment) for anaplastic lymphoma kinase (ALK).

Other Notes

Triplet probe. Measurement of rotational diffusion of protein in solution and in membranes, including myosin and pyruvate dehydrogenase

related product

Product No.
Description
Pricing

Storage Class Code

11 - Combustible Solids

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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Certificates of Analysis (COA)

Lot/Batch Number
BCCM3049
BCCL1128
BCCJ4780
BCCG9639
BCCF3538

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S Ishiwata et al.
The Journal of biological chemistry, 262(17), 8314-8317 (1987-06-15)
We studied the rotational Brownian motions of myosin heads, of which the sulfhydryl group was selectively labeled with the triplet probe 5-eosinylmaleimide, in myofibril by using flash-induced phosphorescence anisotropy decay measurements. The anisotropy decay curve under relaxing conditions consisted of
Renée L Crisp et al.
Pediatric blood & cancer, 59(7), 1299-1301 (2012-04-11)
We studied 31 children with hemolytic anemia, or with positive family history for hereditary spherocytosis (HS), to assess the reliability of capillary blood samples for the diagnosis. HS was diagnosed in 20 patients. Cryohemolysis (CH) was positive in 94% and
Linda Hunt et al.
Cytometry. Part B, Clinical cytometry, 88(1), 50-57 (2014-09-18)
The eosin-5'-maleimide (EMA) Binding test measures reduced mean channel fluorescence (MCF) reading of EMA-labeled red cells (EMA-RBCs) from patients with hereditary spherocytosis (HS). Reporting test results can be either in the actual MCF reading or as a ratio by normalization
P A Knauf et al.
The American journal of physiology, 264(5 Pt 1), C1144-C1154 (1993-05-11)
Eosin-5-maleimide (EM) has been used as a fluorescent probe for the external-facing transport site of the human erythrocyte band 3 protein. Changes in chloride concentration at both sides of the membrane have no significant effect on the inhibitory potency of
Paola Bianchi et al.
Haematologica, 97(4), 516-523 (2011-11-08)
The laboratory diagnosis of hereditary spherocytosis commonly relies on NaCl-based or glycerol-based red cell osmotic fragility tests; more recently, an assay directly targeting the hereditary spherocytosis molecular defect (eosin-5'-maleimide-binding test) has been proposed. None of the available tests identifies all
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