Supercritical fluid extraction combined with microcolumn liquid chromatography for the analysis of polymer additives

Abstract

Abstract. Polymer additives were extracted with supercritical carbon dioxide and collected in a microtrap. The collected samples were separated by microcolumn liquid chromatography. Polymer samples down to the sub-milligram level were handled without loss of extract. Information about the distribution of additives was also obtained.

Purification of post-consumer polyolefins via supercritical CO2 extraction for the recycling in food contact applications

“…These results are in accordance with the literature [31,32]. Extraction from films is more effective in the present study than in that of Nerin et al [31] who could extract no more than 90% of pesticides from films of 90 m thickness of recycled plastics used as agricultural soil covers (mixture of low density polyethylene (∼90%w/w) and ethylene-vinyl acetate copolymer (∼10%w/w)) at 75 • C, 200 bar and 10 min of extraction.…”

“…Extraction from films is more effective in the present study than in that of Nerin et al [31] who could extract no more than 90% of pesticides from films of 90 m thickness of recycled plastics used as agricultural soil covers (mixture of low density polyethylene (∼90%w/w) and ethylene-vinyl acetate copolymer (∼10%w/w)) at 75 • C, 200 bar and 10 min of extraction. Hirata and Okamoto [32] found that additives could be extracted at 90% of yield from polyethylene films at 35 • C and 254 bar within 2 h.…”

“…Obviously, it is important to confirm that the results obtained by SCCO 2 extraction method are the most promising ones. In their works on extraction of additives from polymers, Vandenburg et al [10] and Hirata and Okamoto [32] found that the SCCO 2 extraction has great potential for extraction from polymers, less time-consuming and represents an excellent alternative to conventional solvent extraction. Recently, in their study, Arias et al [9] compared several methods for extraction of antioxidants from low-density and high-density Fig.…”

Approaches for on-line coupling of extraction and chromatography

“…The solvating properties of the fluid are also decreased substantially during the depressurisation. Many SFE-GC applications have been published [128,129,130,131,132,133,134,135,136,137,138,139,140,141], and a few SFE-SFC [143,144,145,146] and numerous SFE-LC [147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173] applications have been reported. SFE-SFC applications are not covered in this review.…”

“…The most common interface in SFE-LC coupling is solidphase trapping, although a few other types of interfaces have been developed as well [143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173]. These include the impactor interface, open-tubular trapping, and the sample loop interface.…”