Table 1.
Information on the vegetable oils used in this study1)
| Vegetable oils (Abbr., n) | Raw materials | Raw material origin | Bottle materials |
|---|---|---|---|
| Soybean oil (SO, 7) | Soybean 100% | Imported | Polyethylene terephthalate or polyethylene |
| Corn oil (CO, 4) | Germ of corn (maize) 100% | Imported | Polyethylene terephthalate or polyethylene |
| Olive oil (OvO, 16) | Olive 100% | Imported | Polyethylene terephthalate or glass (amber or transparent) bottle |
| Canola oil (CaO, 4) | Canolar (rapeseed) seed 100% | Imported | Polyethylene terephthalate |
| Grapeseed oil (GsO, 11) | Grapeseed 100% | Imported | Polyethylene terephthalate or glass (amber or transparent) bottle |
| Red pepper flavored oil (RpO, 1) | Soybean oil (93%), red pepper powder, red pepper seed | Imported | Glass transparent bottle |
| Hazelnut oil (HO, 1) | Hazelnut 99.9% | Imported | Glass transparent bottle |
| Functional oil (FO, 2) | Esterified canola oil with medium chain fatty acids (MCFA) | Imported | Polyethylene terephthalate |
| Sesame oil (SeO, 26) | |||
| Industrialized (14) | Sesame seed 100% | Domestic (n=2)/Imported (n=12) | Glass (amber) bottle |
| Traditional (12) | Sesame seed 100% | Domestic (n=3)/Imported (n=9) | Glass (amber) bottle |
| Perilla oil (PO, 25) | |||
| Industrialized (7) | Perilla seed 100% | Domestic (n=1)/Imported (n=6) | Glass (amber) bottle |
| Traditional (18) | Perilla seed 100% | Domestic (n=9)/Imported (n=9) | Glass (amber) bottle |
1)
Among the various contents written on the ‘product label’ of the vegetable oils, the information that might be related to the lipid oxidation of the oils was extracted and listed. The vegetable oils produced in an industrialized manner were purchased after checking their ‘best by’ dates, thus there were no oil samples whose ‘best by’ dates passed by.