Preparation of electrospun polyacrylonitrile/ϒ-cyclodextrin metal-organic framework nanofibers for extraction of
Mahshid Majd1, Saeed Nojavan1, Majid Maghsoudi1
1Department of Analytical Chemistry and Pollutants, Shahid Beheshti University, G. C., Evin, Tehran 1983969411, Iran.
Abstract:
This study employed thin-film solid-phase microextraction procedure as a simple, sensitive, green, and solvent-free method for the co-extraction of multi-classes herbicides from cereal samples before HPLC-UV analysis. To provide an efficient sorbent, electrospun nanofibers of the crosslinked polyacrilonitril/ϒ-cyclodextrin-metal-organic framework (PAN/ϒ-CD-MOF) were successfully fabricated and assessed as a new thin-film adsorbent. Under the optimal conditions (desorption solvent: acetonitrile, desorption time: 5 min, sample solution pH: 7.0, salt concentration: 15% (w/w), and extraction time: 15 min), good linearity in the range of 2.5-1250.0 ng/mL (r2 ≥ 0.992) was obtained. The detection limits were 0.75-2.50 ng/mL. The extraction recoveries and relative recoveries were 64.9-75.7% and 92.9-106.1%, respectively. The method showed good precision as the relative standard deviations were ≤ 6.3%. Finally, the developed method was applied efficiently for trace analysis of the herbicides in wheat, rice, and barley samples. Generally, the proposed method provided a simple, sensitive, environmentally friendly, and relatively fast approach.
