Oxidative Rancidity in Refined Sunflower Oil with Respect to Storage Variation

✍ Scribed by Nasirullah, ;Nagaraja, K. V.

• Book ID: 102462073
• Publisher: John Wiley and Sons
• Year: 1989
• Weight: 315 KB
• Volume: 91
• Category: Article
• ISSN: 0931-5985
• DOI: 10.1002/lipi.19890910208

✦ Synopsis

By N a s i r u l l a h a n d K . K N a g a r a j a "

Refined sunflower oil was stored in brown and colorless glass bottles at ambient temperature (18-32' C) and 37' C to assess the effect oflight, heat and air on the stability of the oil and to record the progress of oxidative rancidity especially the secondary stages with respect to storage variation and time. Oil sample stored in brown color bottle was found to be superior (FFA 0.1.5 to 0.53; PV 0.5 to 80; H V 3 to 12; oxirane oxygen0.2 to2.3) over oil stored in colorless bottle (FFA 0.15 to 0.60; PV 0.5 to 91; HV 3 to 8; oxirane oxygen 0.1 to 2.8) at ambient temperature. Samples stored at 3 i o C deteriorated very fast. Silver nitrate test, oxidised fatty acid formation, urea adduct formation, picric acid-TLC test, Kreh test, DNP-TLC test, DNP-precipitation test have been devised to detect and follow oxidative rancidity.

These tests worked well even at the lower levels of oxycompounds. No conjugation was detected in any of the oil.