期刊论文

中文

中南林业科技大学学报

1673-923X

2009

29

3

95-99

10.3969/j.issn.1673-923X.2009.03.026

中南林业科技大学***项目（104-0071）；

本校为第一机构

采用盐析法从柚皮果胶提取液中盐析沉淀果胶.研究了盐析剂种类对果胶沉淀得率及盐折过程中pH值对果胶沉淀得率和果胶灰分含量的影响,并探索了适宜盐析条件和盐析机理.实验结果表明:以硫酸铝钾为柚皮果胶盐析剂,适宜盐析条件为:pH值5.8.盐析温度25℃,盐析时间30 min,果胶沉淀得率可达91.4%,采用三氯化铁盐析果胶,则pH值宜控制在4.0,于60℃下盐析60 min,果胶沉淀得率达95.8%.两种盐析方法所得果胶灰分均低于5.0%.铝盐盐析的果胶为白色,铁盐盐析的果胶颜色呈浅黄色,加入脱铁助剂Aid-4后可以获得较好的脱色效果.铁盐和铝盐盐析果胶的机理相似,都是果胶中的羧基离子取代金属水合物中的羟基,与金属离子...

Salting-out processes were applied to precipitate shaddock-peel pectin from shaddock-peel pectin extracts. Effects of salting-out agents and pH value on pectin precipitation yield and pectin ash content were investigated; suitable salting-out conditions and mechanism were also discussed. Results from experiments show that if aluminum potassium sulfate is used as salting-out agent, the suitable conditions are pH value 5.8, temperature 25℃ and salting-out time 30 minutes, which ensure the precipitation of white pectin with a 91. 4 % yield; that ...