Non-destructive detection of trans-caryophyllene in early sweetpotato black spot disease using a QCM gas sensor based on modified CAU-1@ZIF-8 composite

• Published in: Microchemical journal 2024-07, Vol.202, p.110782, Article 110782
• Main Authors: Liu, Suqi, Pang, Linjiang, Wu, Xiaowei, Chen, Shihao, Yang, Mingyi, Cheng, Jiyu, Lu, Guoquan, Wang, Zhenhe, Chen, Wei, Guan, Yuge, Lu, Xinghua
• Format: Article
• Language: English
• Subjects: Metal organic framework; Quartz crystal microbalance; Sweetpotato; Trans-caryophyllene
• ISSN: 0026-265X; 1095-9149
• DOI: 10.1016/j.microc.2024.110782

[Display omitted] •QCM gas sensors based on the composite of modified CAU-1@ZIF-8 was fabricated.•Adsorption of modified CAU-1 on trans-caryophyllene increased 2.8 times.•The sensor has better selectivity and sensitivity to trans-caryophyllene.•The early infestation sweetpotato can be nondestructively detected by the sensor. Changes in the content of trans-caryophyllene could identify whether sweetpotatoes are infected with black spot disease. Therefore, in this study, a quartz crystal microbalance (QCM) sensor based on modified CAU-1@ZIF-8 was used for non-destructive detection of sweetpotato black spot. The experimental results showed that the constructed sensor performed best when both modified CAU-1 and ZIF-8 were present. The sensor showed a linear trend (R2 = 0.996, limit of detection (LOD) = 0.55 ppm) in response to trans-caryophyllene in the concentration range of 20–340 ppm with a sensitivity of −0.489 Hz (ppm)−1. The developed gas sensor was successfully used for the detection of trans-caryophyllene in real samples of sweetpotato. The experimental data showed a significant correlation with the results of gas chromatography-mass spectrometry (GC–MS) with a correlation coefficient of 0.970 (p