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Sudan dyes are synthetic azo dyes which are widely used in industry.
Although they are not allowed in foodstuffs, they have been found
contaminating in different food products and their presence is regularly reported. It
is assumed that these appearances are due to cross-contamination or
adulteration. In this paper, we present a newly developed fast and sensitive
method for the quantification of eight Sudan dyes, using liquid-liquid
extraction and UPLC-MS/MS analysis. The calibration curves were linear over the
range of 0.1-25 mg/kg. Mean recovery for the eight Sudan dyes ranged from
80.7% to 104.4%, and with the inter-day and intra-day precisions
ranged from 2.24% to 12.2%. The method was successfully applied in the determination
of Sudan dyes in chili powder of 10 samples.
It has theoretical significance and practical value to synthetize and modify amorphous carbon films by liquid electro-deposition technique due to its low cost, simple equipment, and better operability in uniform deposition of the films with large-area and complex shape work pieces. This article introduces the research situation of the carbon films prepared by liquid phase electrochemical deposition according to the applied voltage, discusses the influence of experimental parameters on the film properties, and describes possible reaction mechanisms. It summarizes the research progress of amorphous carbon films doped with metal and nonmetals. Finally, existing problems have been demonstrated and suggestions on research hotspots in the future are given.