STUDYING THE EFFECT OF STATIC MAGNETIC FIELDS TO FREEZING TIME FOR VIETNAMESE CATFISH (PANGASIUS) FILLETS

Abstract

The main objective of paper is to study the effect of static magnetic fields to the freezing time for the Vietnameses catfish (Pangasius) fillets. In this study, the catfish fillets were considered with an average size of 210x80x15mm (length x width x thickness). They were frozen from 12°C to -18°C (center temperature) in a medium temperature of -40°C, -35°C and -30°C with air velocity of 5m/s in two different methods: the conventional air blast freezing (ABF) and the innovation air blast freezing assisted static magnetic fields (SMF) with 431, 453, 499 and 528 Gauss to study the influence of static magnetic fields to freezing time. At the same air freezing temperature, the freezing time with SMF decrease from 34% to 56% compared to the ABF when the magnetic density increases from 431 Gauss to 528 Gauss. This shows the innovation freezing assisted static magnetic fields may influence positively the decreasing of freezing time to save energy as well as the improving of quality for the Vietnamese catfish fillets.