2. Materials and methods
2.1. Samples preparation
A total of 51 green bacon belly pieces with an average weight of 1.2 ± 0.3 kg from commercially available Taihu × Duroc × York crossbreed pigs weighting 90–110 kg were purchased from a local supermarket. After 24 h of chilling at 4 °C in a refrigerator, three of them were randomly sampled and analysed as a control of the raw material, the remaining green bacons were divided into four groups, each containing 12 pieces. Group-1 (LT&LS) samples were salted with 1.0% salt and ripened at an initial temperature (the drying–ripening temperature on first day) of 16 °C; group-2 (LT&HS) samples were salted with 5.0% salt and ripened at an initial temperature of 16 °C; group-3 (HT&LS) samples were salted with 1.0% salt and ripened at an initial temperature of 20 °C; group-4 (HT&HS) samples were salted with 5.0% salt and ripened at an initial temperature of 20 °C. For all these four groups, the samples were salted for 3 days at 4 °C and 85–90% relative humidity (RH), and during drying–ripening period, drying–ripening temperature was increased at 1.5 °C/day, RH gradually reduced from 85% to 79% at 0.5%/day.
The central fraction muscle of the bacons at four process points (end of salting, drying–ripening 3, 6 and 9 days), which were trimmed off intermuscular fat, were taken as samples for analysis. Three replicated samples were sampled at every process point. Samples after sampling were vacuum-packaged and stored at −40 °C until analysis.
2. Materials and methods2.1. Samples preparationA total of 51 green bacon belly pieces with an average weight of 1.2 ± 0.3 kg from commercially available Taihu × Duroc × York crossbreed pigs weighting 90–110 kg were purchased from a local supermarket. After 24 h of chilling at 4 °C in a refrigerator, three of them were randomly sampled and analysed as a control of the raw material, the remaining green bacons were divided into four groups, each containing 12 pieces. Group-1 (LT&LS) samples were salted with 1.0% salt and ripened at an initial temperature (the drying–ripening temperature on first day) of 16 °C; group-2 (LT&HS) samples were salted with 5.0% salt and ripened at an initial temperature of 16 °C; group-3 (HT&LS) samples were salted with 1.0% salt and ripened at an initial temperature of 20 °C; group-4 (HT&HS) samples were salted with 5.0% salt and ripened at an initial temperature of 20 °C. For all these four groups, the samples were salted for 3 days at 4 °C and 85–90% relative humidity (RH), and during drying–ripening period, drying–ripening temperature was increased at 1.5 °C/day, RH gradually reduced from 85% to 79% at 0.5%/day.The central fraction muscle of the bacons at four process points (end of salting, drying–ripening 3, 6 and 9 days), which were trimmed off intermuscular fat, were taken as samples for analysis. Three replicated samples were sampled at every process point. Samples after sampling were vacuum-packaged and stored at −40 °C until analysis.
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