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Position: Home > Articles > Effect of Freeze Condensation on Quality of Litchi Juice FOOD SCIENCE 2010,31 (3) 91-93

冷冻浓缩处理对荔枝汁品质的影响

作  者:
曾杨;曾新安
单  位:
华南理工大学轻工与食品学院
关键词:
冷冻浓缩;荔枝汁;营养成分
摘  要:
为了研究冷冻浓缩处理对荔枝果汁品质的影响,采用华南理工大学自主研制的冷冻浓缩处理装置,将荔枝原汁经过多级浓缩得到不同可溶性固形物含量的浓缩汁,复原后测定其理化特性及营养成分,包括pH值、总酸、还原糖、蛋白质、VC等指标。结果表明:随着浓缩级数的增加荔枝汁浓度不断提高,3级浓缩汁可溶性固形物含量达45.3°Brix;复原后pH值、总酸、还原糖和蛋白质没有显著的变化,VC含量略有下降,保留率为85%,远远小于热处理损失。冷冻浓缩处理对荔枝汁有很好的浓缩效果,并且能很好地保存荔枝汁原有的营养物质,是一种很有前景的冷加工技术。
译  名:
Effect of Freeze Condensation on Quality of Litchi Juice
作  者:
ZENG Yang,ZENG Xin-an(College of Light Industry and Food Sciences,South China University of Technology,Guangzhou 510640,China)
关键词:
freeze condensation;litchi juice;nutrient content
摘  要:
In order to investigate the effect of freeze condensation on quality of litchi juice,the concentrated litchi juice obtained through multiple-step freeze condensation with various soluble solid content was used to analyze nutrient content,pH,total acids,reducing sugar,protein as well as vitamin C after the recovery.Results showed that soluble solid content in the concentrated juice reached up to 45.3°Brix through a three-step condensation;while,no obvious change of nutrient content in recovered juice was observed.Although vitamin C exhibited a decreasing trend,retention rate of vitamin C in recovered juice was up to 85%.These investigations suggest that freeze condensation is an effective strategy to concentrate litchi juice with intact original quality.

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