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不同贮藏条件对冻干荔枝色泽的影响

2012-09-11方长发黄略略张树飞

食品工业科技 2012年16期

方长发,乔 方,黄略略,张树飞

(深圳职业技术学院应用化学与生物技术学院,广东深圳518055)

不同贮藏条件对冻干荔枝色泽的影响

方长发,乔 方*,黄略略,张树飞

(深圳职业技术学院应用化学与生物技术学院,广东深圳518055)

以冷冻干燥后的怀枝荔枝干为研究对象,对不同贮藏条件下(光照、氧气、温度、湿度)冻干荔枝果肉的色泽变化进行了研究。结果表明,影响冻干荔枝色泽变化的主要因素为贮藏温度、表面湿度及氧气。密封贮藏的冻干荔枝在37℃下保存两周后,出现褐变及萎缩变形现象,而在有氧气(空气中)及相对湿度65%~70%的情况下,色泽变化更加明显。同样包装的冻干荔枝果肉在低温(4℃)及密封情况下,贮藏90d仍能较好地保持原有色泽基本不变,25℃贮藏两个月的冻干荔枝出现明显的变色现象。低温及干燥环境是保持冻干荔枝色泽的理想条件。

冻干荔枝,温度,贮藏,色泽

Abstract:The Freeze-dried Litchi of HuaiZhi was used to study the change of color in different storage conditions.The results showed that the main factors affecting color change to freeze-dried litchi was the storage temperature,surface humidity and oxygen concentration.The freeze-dried Litchi stored in a sealed container at 37℃occurred browning and shrinking after two weeks.The situation became worse when the freeze-dried Litchi stored in a opened container at 37℃,relative humidity 65%~70%.But the other groups stored in lowtemperature(4℃) and sealed container for 90d maintained the original color and crispness.But the color of freeze-dried Litchi stored in a sealed container at 25℃had significant change.The environment of low temperature and low humidity was the ideal storage conditions for protecting the color of freeze-dried Litchi.

Key words:freeze-dried litchi;temperature;storage;color

食品真空冷冻干燥(冻干)一直是研究的热点,国内外在果蔬冷冻干燥方面的应用也十分广泛,国外有报道对热带水果的真空冷冻干燥进行了比较详细的研究[1],国内对香蕉[2-3]、哈密瓜[4]、草莓[5-6]、火龙果[7]、柠檬[8]等进行了研究,国内对于荔枝的冷冻干燥早在1999年就有研究[9],近期也有研究对荔枝真空冷冻干燥工艺关键技术参数进行了摸索,主要都是集中在对冻干工艺参数、荔枝护色等的研究上[10],对于冻干荔枝的保藏研究却很少。冻干水果以其独特的口感及营养成分的保留近几年受到极大的青睐,但由于冻干水果含水量非常低,有吸湿性强的缺点,特别是冻干荔枝,其口感松脆,含糖量高,吸湿性在冻干荔枝上表现的尤为突出。……

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