High Sensitivity Bacillus thuringiensis Cry1Ac Protein Detections Using Fluorescein Diacetate Nanoparticles

Area of Science:

• Biotechnology
• Analytical Chemistry
• Materials Science

Background:

• Transgenic protein analysis is crucial for various applications.
• Existing methods like ELISA have limitations in sensitivity.
• Development of novel, highly sensitive detection techniques is needed.

Purpose of the Study:

• To develop a highly sensitive transgenic protein analysis method.
• To utilize fluorescein diacetate (FDA) nanoparticles for enhanced detection.
• To evaluate the performance of the proposed immunoassay.

Main Methods:

• Preparation of nano-sized fluorescein diacetate (FDA) particles using ball milling.
• Control of FDA particle size through centrifugation speed.
• Immobilization of antibodies onto FDA particles to maintain protein bioactivity.
• Development of an immunoassay using FDA nanoparticles and Cry1Ac antibody.

Main Results:

• Successfully prepared well-distributed nano-sized FDA particles.
• Demonstrated that proteins retain bioactivity after attachment to FDA particles.
• Achieved a linear detection range of 0.01 ng/L–30 μg/mL for Cry1Ac antibody with 150 nm FDA particles.
• Established a lower detection limit of 0.01 ng/L, representing a 100-fold increase in sensitivity compared to ELISA.

Conclusions:

• Fluorescein diacetate (FDA) nanoparticles offer a highly sensitive platform for protein analysis.
• FDA-based immunoassays are a promising approach for transgenic protein detection.
• The developed method significantly outperforms traditional ELISA in terms of sensitivity.