Development and Characterization of Biocompatible Cellulose Acetate Substrate for Flexible Electrochemical Biosensors

Karri Trinadha Rao;Rahul Gangwar;K. Aditya Bhagavathi;Sajmina Khatun;Pravat Kumar Sahu;Aravind Kumar Rengan;Challapalli Subrahmanyam;Suresh Kumar Garlapati;Siva Rama Krishna Vanjari
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Abstract

This article focuses on the development and characterization of flexible, biocompatible substrates using cellulose acetate (CA), a natural biopolymer known for its biocompatibility and adjustable biodegradability. As a proof of concept, the electrochemical detection of Staphylococcus aureus was carried out using Au-nanoparticle (NP)-modified flexible screen-printed electrode (FSPE) on the CA substrate. The key take away from the reliability studies is that the electrochemical performance is intact after multiple bendings. The tensile strength of 2.75±0.03 MPa is an indicative of the flexibility of the substrate. The substrate showed little degradation during the fabrication of screen-printed electrode (SPE) and the time-consuming surface functionalization protocols required for Au-NP deposition and bioreceptor immobilization. The selective and ultrasensitive detection of S.aureus (LOD: 0.13 CFU/mL) is a testimony for the robustness of the substrate in flexible electrochemical biosensor applications.
用于柔性电化学生物传感器的生物相容性醋酸纤维素基底的开发与表征
醋酸纤维素是一种天然生物聚合物,以其生物相容性和可调生物降解性而著称。作为概念验证,在 CA 基质上使用金纳米粒子(NP)修饰的柔性丝网印刷电极(FSPE)对金黄色葡萄球菌进行了电化学检测。可靠性研究的主要结论是,经过多次弯曲后,电化学性能依然完好。2.75±0.03 兆帕的拉伸强度表明了基底的柔韧性。在丝网印刷电极(SPE)的制作过程中,以及在 Au-NP 沉积和生物受体固定所需的耗时的表面功能化过程中,基底几乎没有降解。对金黄色葡萄球菌的选择性超灵敏检测(LOD:0.13 CFU/mL)证明了该基底在柔性电化学生物传感器应用中的稳健性。
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