Underground storage protect the quality of vegetable oil more than
aboveground storage
Abstract
Abstract: Peanut and soybean oils were placed in stainless steel storage
tanks in natural environment, static atmosphere tanks, added tertiary
butyl hydroquinone (TBHQ) tanks, nitrogen-filled tanks and underground
tanks were stored for 18 months. Acid value, peroxide value, fatty acid
composition, tocopherols, phytosterols and the volatile flavor compounds
were detected. The results indicated that underground storage (no
nitrogen adjustment and no antioxidant added) was found to be the most
appropriate method for maintaining the quality of peanut and soybean
oils over time. Static atmosphere tanks caused the most pronounced
losses of tocopherols, phytosterols, and the volatile flavor compounds
in peanut and soybean oils. The acid value of the four peanut oils and
four soybean oils did not exceed the Chinese GB/T 1534-2017 and GB
2716-2018 standard limit of 1.5 and 3.0 mg KOH/g. However, the peroxide
value of peanut oil in static atmosphere tank, nitrogen-filled tank and
underground tank exceeded the Chinese GB/T 1534-2017 standard limit of
12 meq O2/kg at 5 months, 11 months and 13 months respectively, but the
peroxide value of peanut oil added TBHQ did not exceed the national
standard limit. The peroxide value of soybean oil in static atmosphere
tank and nitrogen-filled tank exceeded the Chinese GB 2716-2018 standard
limit of 20 meq O2/kg at 7 months and 18 months respectively, but the
soybean oil added TBHQ and underground did not exceed the national
standard limit.