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Extraction and quantification of antioxidants from low-density polyethylene by microwave energy and liquid chromatography

2004; Elsevier BV; Volume: 521; Issue: 2 Linguagem: Inglês

10.1016/j.aca.2004.05.087

1873-4324

Sonia Dopico, J. Manuel López, Rebeca Bouza, M. J. Abad, Elena González Soto, M. Victoria González‐Rodríguez,

Analytical Chemistry and Chromatography

In this paper a experimental design is applied to optimize the quantification of hindered phenol Irganox 1076, phosphite antioxidant Irgafos 168 and their oxidized product tri[2,4-di-tert-butylphenyl]phosphate from low-density polyethylene (LDPE). The developed analytical method consists of two steps: microwave-assisted extraction and reversed-phase liquid chromatography (LC) coupled with ultraviolet diode-array detector. A Plackett–Burman design was carried out in order to find the significant experimental parameters affecting the antioxidants extraction by microwave energy. These parameters were subsequently optimized by a central composite design. The performed method allows extracting the studied antioxidants at low temperature in a short time without degradation of phosphite antioxidant Irgafos 168.