Mito-targeted "turn-on" fluorescent probe for nickel (II) detection

Area of Science:

• Analytical Chemistry
• Biochemistry
• Cell Biology

Background:

• Nickel ions (Ni²⁺) play crucial roles in biological systems.
• Accurate detection of intracellular Ni²⁺ is essential for understanding its biological functions.
• Existing detection methods often lack selectivity or require complex procedures.

Purpose of the Study:

• To develop a novel fluorescent probe for highly selective and sensitive detection of Ni²⁺.
• To evaluate the probe's performance in detecting Ni²⁺ within the mitochondria of living cells.

Main Methods:

• Synthesis and characterization of a new mito-tracker probe (NiP).
• Spectroscopic analysis to determine selectivity and limit of detection for Ni²⁺.
• Application of NiP for real-time imaging of Ni²⁺ in living cells.

Main Results:

• NiP exhibits very weak intrinsic fluorescence, enhancing signal-to-noise ratio.
• NiP demonstrates high selectivity (≥160-fold) for Ni²⁺ over other metal ions.
• The limit of detection for Ni²⁺ was determined to be 21.6 nmol.
• Successful application of NiP for rapid determination of Ni²⁺ in living cell mitochondria.

Conclusions:

• NiP is a highly selective and sensitive fluorescent probe for Ni²⁺ detection.
• NiP provides a fast, simple, and low-cost method for assessing Ni²⁺ levels in cellular mitochondria.
• This probe has practical applications in biological research and diagnostics.