Strategies for Overcoming the Single-Molecule Concentration Barrier

Area of Science:

• Chemistry
• Biochemistry
• Physical Chemistry

Background:

• Single-molecule fluorescence (SMF) revolutionized understanding of chemical and biological mechanisms.
• SMF is typically limited to low concentrations, restricting applications to high-affinity interactions.
• Most biological and chemical processes occur at much higher reactant concentrations than SMF traditionally allows.

Purpose of the Study:

• To discuss challenges of performing SMF at high concentrations.
• To present applications of high-concentration SMF in biology and chemistry.
• To highlight key advancements enabling SMF beyond the concentration barrier.

Main Methods:

• Review of recent methodological advances in single-molecule fluorescence.
• Analysis of techniques overcoming the low-concentration limitation.
• Discussion of strategies for resolving single molecules at high reactant concentrations.

Main Results:

• Methodological advances have enabled SMF techniques to operate at concentrations up to 1 mM.
• The concentration barrier, previously limiting SMF applications, has been overcome.
• New physical phenomena at high concentrations are now accessible for study.

Conclusions:

• High-concentration SMF techniques expand the scope of molecular studies.
• These advanced methods offer new insights into biological and chemical processes.
• Further exploration of phenomena beyond the concentration barrier is anticipated.