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BTA-1 [2-(4'-(methylamino)phenyl)benzothiazole]

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Physical properties
Molecular weight240.32
Spectral properties
Excitation (nm)349
Emission (nm)421
Storage, safety and handling
H-phraseH303, H313, H333
Hazard symbolXN
Intended useResearch Use Only (RUO)
R-phraseR20, R21, R22
StorageFreeze (< -15 °C); Minimize light exposure


Molecular weight
Excitation (nm)
Emission (nm)
BTA-1 is a fluorescent Thioflavin-T derivative that exhibits high affinity for amyloid deposits (Ki = 11 nM for Ab 40). It crosses the blood brain barrier and displays up to 50-fold higher affinity than Thioflavin-T, and used for selectively staining cerebral plaques and cerebrovascular amyloid deposits in the brains of PS1/APP transgenic mice.


Common stock solution preparation

Table 1. Volume of DMSO needed to reconstitute specific mass of BTA-1 [2-(4'-(methylamino)phenyl)benzothiazole] to given concentration. Note that volume is only for preparing stock solution. Refer to sample experimental protocol for appropriate experimental/physiological buffers.

0.1 mg0.5 mg1 mg5 mg10 mg
1 mM416.112 µL2.081 mL4.161 mL20.806 mL41.611 mL
5 mM83.222 µL416.112 µL832.224 µL4.161 mL8.322 mL
10 mM41.611 µL208.056 µL416.112 µL2.081 mL4.161 mL

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Spectral properties

Excitation (nm)349
Emission (nm)421



View all 7 references: Citation Explorer
Mechanism of A beta(1-40) fibril-induced fluorescence of (trans,trans)-1-bromo-2,5-bis(4-hydroxystyryl)benzene (K114)
Authors: LeVine H, 3rd.
Journal: Biochemistry (2005): 15937
Multiple ligand binding sites on A beta(1-40) fibrils
Authors: LeVine H, 3rd.
Journal: Amyloid (2005): 5
Efficient radiosynthesis of carbon-11 labelled uncharged Thioflavin T derivatives using [11C]methyl triflate for beta-amyloid imaging in Alzheimer's Disease with PET
Authors: Solbach C, Uebele M, Reischl G, Machulla HJ.
Journal: Appl Radiat Isot (2005): 591
Amyloid imaging probes are useful for detection of prion plaques and treatment of transmissible spongiform encephalopathies
Authors: Ishikawa K, Doh-ura K, Kudo Y, Nishida N, Murakami-Kubo I, Ando Y, Sawada T, Iwaki T.
Journal: J Gen Virol (2004): 1785
Development of a PET/SPECT agent for amyloid imaging in Alzheimer's disease
Authors: Wang Y, Klunk WE, Debnath ML, Huang GF, Holt DP, Shao L, Mathis CA.
Journal: J Mol Neurosci (2004): 55
In-vivo imaging of Alzheimer disease beta-amyloid with [11C]SB-13 PET
Authors: Verhoeff NP, Wilson AA, Takeshita S, Trop L, Hussey D, Singh K, Kung HF, Kung MP, Houle S.
Journal: Am J Geriatr Psychiatry (2004): 584
The binding of 2-(4'-methylaminophenyl)benzothiazole to postmortem brain homogenates is dominated by the amyloid component
Authors: Klunk WE, Wang Y, Huang GF, Debnath ML, Holt DP, Shao L, Hamilton RL, Ikonomovic MD, DeKosky ST, Mathis CA.
Journal: J Neurosci (2003): 2086