Highly sensitive and selective electrochemical biosensor using odorant-binding protein to detect aldehydes

• 全文链接

利用气味结合蛋白检测醛类的高灵敏度和选择性电化学生物传感器

关键词：

来源：

Analytica Chimica Acta 期刊

全文链接：

//agri.nais.net.cn/topic/downloadFile/339f4bcc-7cb3-42b3-a92b-ca3b6f0c96a9

来源地址：

https://www.sciencedirect.com/science/article/pii/S0003267024007335

资源所属：

茶学研究专题

类型：

学术文献

语种：

英语

原文发布日期：

2024-08-22

摘要：

Recently, various biosensors based on odorant-binding proteins (OBPs) were developed for the detection of odorants and pheromones. However, important data gaps exist regarding the sensitive and selective detection of aldehydes with various carbon numbers. In this work, an OBP2a-based electrochemical impedance spectroscopy (EIS) biosensor was developed by immobilizing OBP2a on a gold interdigital electrode, and was characterized by EIS and atomic force microscopy. EIS responses showed the OBP2a-based biosensor was highly sensitive to citronellal, lily aldehyde, octanal, and decanal (detection limit of 10−11mol/L), and was selective towards aldehydes compared with interfering odorants such as small-molecule alcohols and fatty acids (selectivity coefficients lower than 0.15). Moreover, the OBP2a-based biosensor exhibited high repeatability (relative standard deviation: 1.6%–9.1%, n = 3 for each odorant), stability (NIC declined by 3.6% on 6th day), and recovery (91.2%–96.6% on three real samples). More specifically, the sensitivity of the biosensor to aldehydes was positively correlated to the molecular weight and the heterocyclic molecule structure of the odorants. These results proved the availability and the potential usage of the OBP2a-based EIS biosensor for the rapid and sensitive detection of aldehydes in aspects such as medical diagnostics, food and favor analysis, and environmental monitoring.