**4. Conclusions**

 In this chapter, two kinds of analysis methods for common additives are introduced. One is HPLC, and the other is 2DLC. Poly-Sery HLB cartridge was confirmed as the most appropriate material for HPLC because of the higher recovery. As to 2DLC, the sample preparation method is much easier, time-saving, and efficient, and this method possesses much higher recovery of food additives by avoiding the sample loss; and the analysis process was performed on an automated instrument within 30 mins. Therefore, it is simpler, faster, and more accurate than current standard methods.

## **Acknowledgements**

 This work was supported by the Independent Innovation Ability Promotion Program of Xi'an Jiaotong University (PY3A012), the Fundamental Research Funds for the Central University (xjj2013119), and the National Natural Science Foundation of Shaanxi Province (2017JQ8024).

The figures in this chapter were taken from my previously published papers [6, 23], and I have got the permission to reuse it.
