2D-fluorescence sensor array for protein identification under various osmolyte and pH conditions

Area of Science:

• Biochemistry
• Analytical Chemistry
• Materials Science

Background:

• Traditional chemical sensor arrays are complex and expensive due to multiple sensing elements.
• Developing simple, sensitive, and cost-effective protein identification methods is crucial.

Purpose of the Study:

• To design and validate a simple, sensitive, two-dimensional fluorescence sensor array for protein identification.
• To explore the use of quantum dots (QDs) and specific buffer solutions for protein discrimination.

Main Methods:

• Fabrication of a two-dimensional fluorescence sensor array using six pH buffer solutions and two osmolytes.
• Utilizing CdSe/ZnS quantum dots (QDs) as fluorescent probes to detect protein-QD interactions.
• Employing linear discriminant analysis (LDA) for data analysis and protein classification.

Main Results:

• Distinct fluorescence response patterns were observed for different proteins due to variations in surface charge and conformation, amplified by osmolytes.
• Accurate classification of 13 individual proteins was achieved using LDA.
• The sensor array successfully discriminated between protein mixtures and proteins at varying concentrations.

Conclusions:

• The proposed fluorescence sensor array offers a simple, rapid, and cost-effective strategy for protein identification.
• This approach shows significant promise for applications in clinical diagnostics and proteomics.
• The sensor's ability to leverage differential protein-QD interactions provides a novel analytical tool.