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Abstract

The photocatalytic effect of ZnO particles was developed for the detection of standard flunitrazepam and Rohypnol tablets in coloured spirit solution by a UV-Vis spectrophotometer. It is a screening technique for qualitative detection and quantitative estimating flunitrazepam concentration before getting the precise values by other high performance techniques. In an alcoholic solution with ZnO particles, the flunitrazepam is changed to 7-amino-flunitrazepam after irradiation. The absorption band shifts to a longer wavelength (309 nm to 345 nm). The photocatalytic parameters such as the reaction temperature, ZnO concentration, and irradiation time were studied in this work. With the optimum condition, the detection limits of standard flunitrazepam and Rohypnol are 0.024 mg/l and 0.092 mg/l in a solution mixture of ethanol and soda water (1:25). The method was applied to detect the flunitrazepam in coloured spirit brands in Thailand.

Synthesis and Application of the Magnetic Nanocomposite GO-Chm for the Extraction of Benzodiazepines from Surface Water Samples Prior to HPLC-PDA Analysis

“…The peaks at the first 6 min are due to the matrix of the adsorbent. The UV spectra of the two BZs were also taken for the identification and verification of the peaks in the real samples, which are comparable and identical to those reported in the literature (Figure 3) [22,23].…”