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Foodborne Pathogen Screening Using Magneto-fluorescent Nanosensor: Rapid Detection of E. Coli O157:H7

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Detection of bacterial spores with lanthanide-macrocycle binary complexes.

Morgan L Cable¹, James P Kirby, Dana J Levine

¹Planetary Science Section, Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, California 91109, USA.

Journal of the American Chemical Society

|June 23, 2009

Summary

Lanthanide-macrocycle binary complexes significantly enhance bacterial spore detection. The terbium-DO2A complex offers superior dipicolinic acid binding, stability, and reduced interference for improved spore identification.

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Area of Science:

Analytical Chemistry
Biochemistry
Materials Science

Background:

Bacterial spore detection is crucial for safety and diagnostics.
Dipicolinic acid (DPA) is a key biomarker for bacterial spores.
Lanthanide luminescence offers sensitive detection methods.

Purpose of the Study:

To improve bacterial spore detection using lanthanide-macrocycle binary complexes.
To compare the efficacy of Sm, Eu, Tb, and Dy complexes with DO2A.
To identify the optimal complex for enhanced spore detection.

Main Methods:

Synthesis and characterization of lanthanide-DO2A binary complexes.
Comparison of DPA binding affinities of binary complexes versus aquo ions.
Evaluation of luminescence properties and stability across varying pH and interfering ions (Ca2+, PO43-).
Assessment of bacterial spore (Bacillus atrophaeus) detection using the Tb(DO2A)(+) complex.

Main Results:

Lanthanide-DO2A binary complexes exhibit enhanced DPA binding affinity and improved bacterial spore detection.
The terbium complex, Tb(DO2A)(+), showed the highest DPA binding affinity and quantum yield.
Tb(DO2A)(+) demonstrated extended pH stability, reduced Ca2+ interference (5-fold), and mitigated phosphate interference (1000-fold).
Detection of Bacillus atrophaeus spores using Tb(DO2A)(+) resulted in a 3-fold increase in signal-to-noise ratio.

Conclusions:

Lanthanide-macrocycle binary complexes, particularly Tb(DO2A)(+), represent a significant advancement in bacterial spore detection.
The enhanced properties of Tb(DO2A)(+) address limitations of previous methods, including stability and interference.
Tb(DO2A)(+) is identified as the optimal binary complex for sensitive and reliable bacterial spore detection.