| Popis: |
According to the Report of Drug Situation in China (2020), the growth rate of the number of drug abusers in China has decreased, but the number of drug abusers is still large. An efficient screening method is necessary for controlling drug abuse. As an important type of biological sample, urine is widely used for the rapid screening of drug addicts. However, because of the complex composition, low content, and strong interference from the body's metabolism, the detection of drugs in urine remains a challenge. Traditional rapid screening techniques such as immunocolloidal gold analysis have a high false positive rate and insufficient quantitative capability. In addition, laboratory mass spectrometry methods require complicated time-consuming sample pre-processing and strict environmental conditions, and hence, are unsuitable for on-site rapid analysis. In recent years, various direct ionization mass spectrometry techniques such as direct analysis in real time (DART), desorption electrospray ionization (DESI), and dielectric barrier discharge ionization (DBDI) have advanced rapidly. These techniques have been applied to public safety, food safety, environmental detection, etc. In contrast to traditional ionization mass spectrometry methods, these direct ionization techniques allow for the |
