Boron-11 (11B)

Boron-11 is a stable, non-radioactive isotope of boron that accounts for approximately 80.1% of the element's natural abundance [Wikipedia, 2024]. In a clinical and biotechnological context, Boron-11 is not a therapeutic target such as a receptor or enzyme; instead, it serves as a critical imaging surrogate in the development and application of Boron Neutron Capture Therapy (BNCT). Due to its nuclear magnetic properties (spin 3/2), Boron-11 can be detected using Magnetic Resonance Imaging (MRI) and Nuclear Magnetic Resonance (NMR) spectroscopy, allowing for the real-time tracking of boron-containing compounds like Boronophenylalanine (BPA) in vivo [Sauerwein et al., 2012]. This imaging capability is essential for determining the optimal timing of neutron irradiation and ensuring that therapeutic concentrations of boron have reached the target tumor cells. While Boron-10 is the isotope responsible for the therapeutic capture of neutrons, Boron-11 provides the necessary pharmacokinetic data to guide treatment planning and dosimetry [Barth et al., 2018].

Other names

11BBoron isotope 11Stable boron-11

Boron-11 acts as a diagnostic probe rather than a therapeutic target. It possesses a nuclear spin of 3/2, which makes it NMR-active and allows for Boron-11 Magnetic Resonance Imaging (11B-MRI). This enables the non-invasive visualization and quantification of boron-containing drug distribution within tissues [Barth et al., 2018; PubChem, 2024].