Abstract:

In this study, the changes of fatty acid oxidation in nut kernel of Korea pine (Pinus koraiensis Sieb. et Zucc.) which were stored in air or air-tight container containing 2%±1%, 5%±1% or 10%±1% O2 for 180 days at ambient temperature (20 to 30 ℃) were investigated. The results showed that total fat, iodine value of Korea pine nut kernel decrease but the acid value, peroxide value, saponification value increase during storage. Low O2 concentration is effective to slow down the decrease of fat content. After 180 days of storage, the Korea pine nut kernel stored in low O2 environment has lower acid value and peroxide value but higher iodine value compared with that stored in air. Furthermore, 2% O2 can inhibit the rise of saponification value of Korea pine nut kernel effectively. All these indicated that low O2 storage can inhibit fat acid oxidation of Korea pine nut kernel, and is beneficial to its storage quality. 2% O2 storage has the best effect.

Key words: pine nut, low O2, ambient-temperature, storage, fatty acid oxidation