Fluorescent detection of cholesterol using β-cyclodextrin functionalized graphene

Area of Science:

• Biochemistry
• Analytical Chemistry
• Materials Science

Background:

• Cholesterol detection is crucial for diagnosing various health conditions.
• Existing methods may lack sensitivity or require complex procedures.
• Fluorescence-based assays offer potential for rapid and sensitive detection.

Purpose of the Study:

• To develop a novel, sensitive fluorescence-based method for cholesterol detection.
• To utilize the host-guest interaction between β-cyclodextrin and cholesterol for signal generation.
• To leverage graphene's properties for signal modulation in the assay.

Main Methods:

• A graphene-based platform functionalized with β-cyclodextrin (β-CD) was synthesized.
• Rhodamine 6G (R6G) was incorporated into the β-CD host, leading to fluorescence quenching by graphene.
• The competitive binding of cholesterol to β-CD was investigated, displacing R6G and restoring fluorescence.

Main Results:

• The developed system exhibited a 'turn-on' fluorescence response in the presence of cholesterol.
• Cholesterol successfully competed with R6G for binding to the β-CD cavity.
• The fluorescence signal intensity correlated with cholesterol concentration, indicating a quantitative detection capability.

Conclusions:

• A sensitive and selective fluorescence sensor for cholesterol detection has been successfully developed.
• The method relies on a competitive host-guest interaction mechanism modulated by graphene.
• This approach offers a promising alternative for cholesterol monitoring in various applications.