This paper (open access) describes the development of a new sorbent to extract tartrazine from fake saffron in a 1-step procedure. Extraction was by dispersive micro- Solid Phase Extraction using a novel metal–organic framework containing iron single atoms doped on electrospun carbon nanofibers. Tartrazine could then be measured by HPLC with Photo Diode Array detection; a widely available and relatively cheap technique.
The authors optimised the extraction conditions and reported that the calibration curve was linear in the range of 5–1000 ng/mL, with a correlation coefficient of 0.992. The LOD and LOQ values ranged 0.38–0.74 and 1.34–2.42 ng/ml, respectively. They concluded that advantages of this method included high extraction recovery (98%), and accuracy (RSDs < 0.75 to 3.6%). with enrichment factors in the range of 80.6–86.4 with preconcentration factor of 22.3.
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