Forchlorfenuron is a low-toxic phenylurea plant growth regulator. Excessive intake of forchlorfenuron can lead to metabolic disorders of the matrix and be harmful to human health. The chemiluminescence intensity of the KIO 4 –K 2 CO 3 –Mn 2+ reaction decreased in the presence of forchlorfenuron. Based on this result, a rapid and sensitive chemiluminescence method was established to determine forchlorfenuron by combining it with a batch injection static device. The injection speed, injection volume and reagent concentration of the forchlorfenuron–KIO 4 –K 2 CO 3 –Mn 2+ chemiluminescence reaction were optimized. Under these optimized conditions, the linear range of the method was 1.0–200.0 μg/L, and the limit of detection was 0.29 μg/L (S/N = 3). The chemiluminescence method for the determination of forchlorfenuron could be completed in 10 s. The method was applied to detect the residual forchlorfenuron in dried fruit samples, and the results are consistent with high-performance liquid chromatography-mass spectrometry. This method has the advantages of high sensitivity, rapid response, less reagent consumption, and convenient operation. It will provide a new perspective for chemiluminescence for the rapid and sensitive determination of forchlorfenuron in various complex samples.
The Indian meal moth, Plodia interpunctella , is a globally important pest of dried fruits and nuts; however, little is known about its oviposition preferences among different dried fruits and nuts. The oviposition preference of Plodia interpunctella was measured on goji berry, fig, walnut, hazelnut, normal-oleic, and high-oleic peanut. Differential volatile organic compounds (VOCs) were identified using gas chromatography–electroantennographic detection (GC–EAD) and further validated using electrophysiological recordings, Y-tube olfactometer assays, and oviposition preference bioassays. Females laid significantly more eggs on goji berry, fig, walnut, hazelnut, and normal-oleic peanut than on high-oleic peanut. Nine active VOCs were identified using GC–EAD with undecane, eicosane, hexadecane, nonanal, ethyl caproate, 2-ethyl-1-hexanol, and octane, eliciting a dose response EAG activity. The Y-tube and oviposition bioassays further demonstrated that females were significantly attracted to nonanal and octane, which were abundant in the more preferred nuts and fruits. In contrast, females were repelled by 2-ethyl-1-hexanol, which was more abundant in high-oleic peanut. These findings provide insights into the chemical ecology of P. interpunctella and support the development of volatile-based attractants and repellents for the management of stored products pest.
危险品化学品经营许可证（带存储）