Parboiling improved oxidative stability of milled white rice during one-year storage

Parboiling improved oxidative stability of milled white rice during one-year storage

Parboiling was investigated to improve the long-term oxidative stability of milled white rice beyond its current application to paddy brown rice. White rice was steamed at $105^{\circ}C$ for 20 min, $120^{\circ}C$ for 5 min, or $120^{\circ}C$ for 20 min without soaking in water, followed by drying at $70^{\circ}C$ for 3 h. During one-year storage at 25 and $4^{\circ}C$, acid value as an index of oxidative deterioration of rice remained relatively constant in parboiled rice samples, while significant increases were observed in raw rice with higher acid values at $25^{\circ}C$ compared with $4^{\circ}C$. This indicates that the parboiling improved the oxidative stability of white rice over the long period of time even at room temperature, therefore it can be an efficient alternative to retard the oxidative deterioration of white rice.