Monitoring of infection volatile markers using CMOS-based luminescent bioreporters

文献类型： 外文期刊

第一作者： Ma, Junning

作者： Ma, Junning;Veltman, Boris;Eltzov, Evgeni;Ma, Junning;Veltman, Boris;Liu, Yang;Eltzov, Evgeni;Veltman, Boris;Tietel, Zipora;Tsror, Leah

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关键词： Whole-cell biosensors; Calcium alginate immobilization; Post-harvest infections; Volatile organic compounds; CMOS; Bioluminescent bacteria

期刊名称：TALANTA （ 影响因子：6.057； 五年影响因子：5.386 ）

ISSN： 0039-9140

年卷期： 2020 年 219 卷

页码：

收录情况： SCI

摘要： Over the past two decades, whole-cell biosensors (WCBs) have been widely used in the environmental field, with only few applications proposed for use in agricultural. This study describes the development and optimization of a WCB for the detection of volatile organic compounds (VOCs) that is produced specifically by infected potato tubers. First, the effect of calcium-alginate matrix formation (beads vs. tablets) on the membrane uniformity and sensing efficiency was evaluated. Then, important parameters in the immobilization process were examined for their effect on the sensitivity to the presence of VOCs. The highest sensitivity to the target VOC was obtained by 20 min polymerization of bacterial suspension with optical density of 0.2 at 600 nm, dissolved in low-viscosity sodium alginate (1.5% w/v) and exposure to VOC at 4 degrees C. After optimization, the lowest limit of detection for three infection-sourced VOCs (nonanal, 3-methyl-1-butanol, and 1-octen-3-ol) was 0.17-, 2.03-, and 2.09-mg/L, respectively, and the sensor sensitivity was improved by 8.9-, 3.1- and 2-fold, respectively. Then, the new optimized immobilization protocol was implemented for the CMOS-based application, which increased the sensor sensitivity to VOC by 3-fold during real-time measurement. This is the first step in creating a sensor for real-time monitoring of crop quality by identifying changes in VOC patterns.

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