Analysis of formaldehyde, acetaldehyde and oligomers in recycled polyethylene terephthalate

Yuka Ohkado, Yoko Kawamura, Motoh Mutsuga, Hiro Omi Tamura, Kenichi Tanamoto

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Formaldehyde (FA), acetaldehyde (AA) and oligomers in recycled polyethylene terephthalate (PET) were analyzed by HPLC. All of the physically recycled PET contained detectable levels of FA, AA and oligomers, and the levels were almost the same as in used bottles. Most superclean-like and chemically recycled PET contained lower levels than new pellets. These compounds showed no decrease upon physical recycling, but showed a marked decrease upon superclean-like recycling. In PET sheets made using physically recycled PET, FA was decreased, though AA was increased by the sheeting process as same as new one. FA, AA and oligomers originated from PET resin and their levels in recycled products were almost equivalent to those in new products. It was concluded that there is no particular safety concern about their presence in recycled PET.

Original languageEnglish
Pages (from-to)218-223
Number of pages6
JournalJournal of the Food Hygienic Society of Japan
Volume46
Issue number5
DOIs
Publication statusPublished - 2005 Oct

Keywords

  • Acetaldehyde
  • Chemical recycling
  • Formaldehyde
  • Oligomer
  • Physical recycling
  • Polyethylene terephthalate (PET)
  • Super-clean

ASJC Scopus subject areas

  • Food Science
  • Public Health, Environmental and Occupational Health

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