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Beta-Amyloid (1-40), Ultra Pure, TFA is a full-length human amyloid-β peptide widely used in Alzheimer’s disease, amyloid aggregation, and cerebrovascular amyloid research. Aβ (1-40), together with Aβ (1-42), represents one of the major C-terminal isoforms generated from amyloid precursor protein (APP) processing.
Although Aβ (1-42) is generally more aggregation-prone and more commonly associated with rapid oligomer and fibril formation, Aβ (1-40) remains highly important in amyloid research because it is one of the dominant endogenous isoforms and is strongly associated with vascular amyloid deposition, including cerebral amyloid angiopathy (CAA). For this reason, Aβ (1-40) is widely used in comparative studies of amyloid isoform behavior, fibrillization kinetics, vascular amyloid mechanisms, and screening workflows involving amyloid-modulating compounds.
Why Researchers Use Aβ (1-40)
Aβ (1-40) is frequently selected when researchers need to compare amyloid isoforms under controlled experimental conditions. Relative to Aβ (1-42), this peptide typically shows lower aggregation propensity and different assembly behavior, making it useful for mechanistic studies of sequence-dependent amyloid formation.
- Isoform comparison with Aβ (1-42)
- Aggregation and fibrillization studies
- Cerebral amyloid angiopathy and vascular amyloid research
- Thioflavin T fibril assays
- Screening of aggregation inhibitors and modulators
Applications in Amyloid and Alzheimer’s Disease Research
Isoform Comparison Studies
Aβ (1-40) is commonly used alongside Aβ (1-42) to study how the two-residue C-terminal difference affects hydrophobicity, aggregation kinetics, oligomer formation, fibril morphology, and biological activity.
Vascular Amyloid Research
Aβ (1-40) has special importance in studies of cerebral amyloid angiopathy because this isoform is strongly associated with amyloid deposition in the cerebral vasculature. This makes the peptide useful in research focused on vascular amyloid mechanisms, blood vessel pathology, and neurovascular dysfunction.
Aggregation and Biophysical Assays
Like other amyloid peptides, Aβ (1-40) can be used in aggregation-focused workflows including Thioflavin T fluorescence assays, electron microscopy, circular dichroism, seeding studies, and fibril characterization experiments. Compared with Aβ (1-42), it provides a useful lower-aggregation reference in many assay systems.
Drug Discovery and Screening
Aβ (1-40) is also used in inhibitor screening and assay development programs aimed at modulating amyloid formation, fibril stability, and peptide self-association. Researchers often compare compound effects on both Aβ (1-40) and Aβ (1-42) to better understand isoform selectivity.
Handling and Solubilization
Amyloid peptides are sensitive to solvent history, concentration, and incubation conditions. Reproducible results depend strongly on standardized handling procedures, especially when comparing monomeric, oligomeric, and fibrillar preparations. For practical guidance on difficult amyloid sequences and peptide solubilization strategies, download the reference
here.
Thioflavin T (ThT) remains one of the most widely used dyes for monitoring amyloid fibril formation and is especially useful for fibril-rich samples. In amyloid assays, ThT fluorescence is commonly measured at approximately 450 nm excitation and 482 nm emission after binding to cross-β fibrillar structures.
Related Products and Resources
For broader background on amyloid aggregation, oligomer toxicity, Thioflavin T assays, and Alzheimer’s disease-related amyloid workflows, please also visit our dedicated page:
Amyloid Peptides for Alzheimer’s Disease Research.
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