微电极
石墨烯
电化学
水杨酸
电化学气体传感器
多电极阵列
检出限
化学
材料科学
电极
分析化学(期刊)
纳米技术
色谱法
生物化学
物理化学
作者
Mingjie Zhang,Mingji Li,Cuiping Li,Mingjie Lyu,Xiuwei Xuan,Hongji Li
标识
DOI:10.1016/j.foodchem.2024.139264
摘要
In this study, a microelectrode array sensor based on boron and nitrogen co-doped vertical graphene (BNVG) was assembled to quantify salicylic acid (SA) in living plants. The influence of B and N contents on the electrochemical reaction kinetics and SA response signal was investigated. A microneedle sensor with three optimized BNVG microelectrodes (3.57 at.% B and 3.27 at.% N) was used to quantitatively analyze SA in the 0.5–100 μM concentration range and pH 4.0–9.0, with limits of detection of 0.14–0.18 μM. Additionally, a quantitative electrochemical model database based on the BNVG microelectrode sensor was constructed to monitor the growth of cucumbers and cauliflowers, which confirmed that the SA level and plant growth rate were positively correlated. Moreover, the SA levels in various vegetables and fruits purchased from the market were measured to demonstrate the practical application prospects for on-site inspection and evaluation.
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