气体射流冲击北京烤鸭鸭皮的色泽和酥脆性

研究加工条件和保藏条件对北京烤鸭鸭皮色泽和酥脆性的影响.以气体射流冲击的北京烤鸭为研究对象,研究了烤制温度、烤制时间和饴糖溶液浓度等加工条件对烤鸭鸭皮色泽的影响,以及温度和含水率等对烤鸭鸭皮酥脆性的影响.结果表明,烤制温度、烤制时间和饴糖溶液浓度对北京烤鸭色泽影响显著.在实验条件范围内,随着烤制温度的上升,烤制时间的延长,烤鸭鸭皮色泽亮度值(L*)逐渐下降,红绿值(a*)上升,黄蓝值(b*)上升,在烤制温度190℃、烤制时间45min、水和饴糖比为12∶1 (m/m)时鸭皮色泽较佳.鸭皮的酥脆性与鸭皮的温度和含水率相关,温度低于鸭油凝固温度时,鸭皮的色泽变浅,酥脆性降低;随着含水率的增大,鸭皮酥脆降低.

Effect of Different Processing and Storage Conditions on the Color and Crispness of Beijing Roast Duck Skin

The effects of the concentration of maltose sprinkled onto duck carcasses and air-jet impingement roasting conditions （temperature and time） on the color of Beijing roast duck skin were studied as well as the effects of storage temperature and moisture content on the crispness. The results showed that all roasting temperature and time as well as maltose concentration had significant effects on the color of roast duck skin. As the roasting temperature increased and roasting time was extended, the brightness value L＊ decreased, whereas redness value a＊ and yellowness value b＊ increased. In the range of experimental conditions investigated, maltose concentration of 12：1 （water/maltose ratio, m/m） and roasting at 190 ℃ for 45 min provided the best color of roast duck skin. The crispness of roast duck skin was related to storage temperature and moisture content. When the storage temperature was lower than the freezing point, the color of roast duck skin became lighter gradually, and the crispness reduced. The higher the moisture content, the crispness of roast duck skin got worse.