Highly-sensitive CD40L protein discrimination via label-free fiber sensing technologies

The recombinant Cluster of Differentiation 40 Ligand (CD40L) can be expressed in various cells and is closely related to various types of cancer. This association underscores the critical need for expedited and precise measurement of CD40L levels in clinical fluid specimen. A novel optical fiber biosensor has been devised, employing single-mode fibers that are sandwiched around a coreless fiber, with the diameter refined by etching with hydrogen fluoride. This innovative configuration allows for light transmission through the evanescent field, thereby enhancing the sensor's sensitivity to changes in the surrounding refractive index. Employing chemical binding techniques, CD40 was securely immobilized onto the fiber’s surface, facilitating the detection of CD40L. The sensor exhibited a sensitivity of 1.126 nm/(μg/mL) and a detection limit of 0.68 nM. Furthermore, the sensor’s specificity for CD40L was validated using authentic clinical serum samples spiked with artificial analytes. In addition, the specificity of CD40L of the proposed sensor was proved by using natural clinical serum samples with artificial analyte addition, by ELISA method assisted, the results ideally conformed with detection of standard samples. With the aid of the ELISA method, the outcomes were found to be in excellent agreement with those from standard sample detections. Consequently, the findings indicate that this sensor provides a specific, label-free, and highly sensitive method for CD40L detection, showcasing its significant potential for applications in molecular biology research.

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