Fate of oxidized triglycerides during refining of seed oils.
The evolution of oxidized triglycerides (ox-TG) during industrial refining was studied in soybean, sunflower, peanut, and corn oils. The analytical techniques used were silica gel column chromatography and high-performance size exclusion chromatography. The decrease in ox-TG during refining (42.3% on average) was accompanied by an increase in triglyceride oligopolymers (TGP). The inverse correlation between the two lipid groups suggests that the decrease in ox-TG during refining was due in part to the occurrence of polymerization reactions. An inverse correlation was also found between the percentage sum of ox-TG + TGP and percent TGP, indicating that a part of the ox-TG also underwent degradation or transformation reactions. On average, almost 58% of the ox-TG remained unchanged during refining and, of the rest, about half was involved in polymerization reactions and half in degradation or transformation reactions.
Gomes
Tommaso
T
Dipartimento di Progettazione e Gestione dei Sistemi Agro-Zootecnici e Forestali, Università degli Studi di Bari, Via Amendola 165/a, I-70126 Bari, Italy. tommaso.gomes@agr.uniba.it
Caponio
Francesco
F
Delcuratolo
Debora
D
D003314:Corn Oil / Q000737:chemistry; D005511:Food Handling / Q000379:methods*; D010084:Oxidation-Reduction; D000074241:Peanut Oil; D010938:Plant Oils / Q000737:chemistry*; D011108:Polymers / Q000032:analysis; D012639:Seeds / Q000737:chemistry*; D013024:Soybean Oil / Q000737:chemistry; D000074242:Sunflower Oil; D014280:Triglycerides / Q000032:analysis / Q000737:chemistry*
D000074241:Peanut Oil; D010938:Plant Oils; D011108:Polymers; D000074242:Sunflower Oil; D014280:Triglycerides; D013024:Soybean Oil; D003314:Corn Oil