Uematsu, Y., Hirata, K., Suzuki, K., Iida, K., & Kamata, K. 2002 Survey of residual solvents in natural food additives by standard addition head-space GC.. Food Additives and Contaminants 19: 4, 335-342.

Notes: Residual levels of 12 solvents in 87 natural food additives (66 samples of food colours including cochineal, 19 samples of natural antioxidants and 2 natural preservatives) collected between 1997 and 1999 were determined by automated head-space GC using FID (flame ionization detector), with a porous-polymer (PLOT) column. Calibration curves were prepared by the method of standard addition. Confirmation was by manually injected head-space GC using mass spectrometric detection.