盐析法从原胶碱液中提取紫胶色酸  

Extraction of lacaic acid from lac alkaline solution by salt precipitation

作　　者：张弘[1,2] 房桂干[1] 李坤[2] 郑华[2] 张雯雯[2] 

机构地区：[1]中国林业科学研究院林产化学工业研究所,江苏南京210042 [2]中国林业科学研究院资源昆虫研究所,云南昆明650224

出　　处：《食品工业科技》2012年第24期290-295,299,共7页Science and Technology of Food Industry

基　　金：科技部农业科技成果转化项目(2010GB24320619)

摘　　要：研究了以原胶为原料,经碱溶除杂后的盐析工艺分离提取紫胶色酸的方法。通过对盐析过程影响因素的分析,建立了盐析法提取紫胶色酸的数学模型并确定了最佳工艺条件:氯化钠加入量9.64g、转速800r/min、盐析温度34.5℃、盐析时间25min、碱液浓度0.188mol/L,最佳工艺条件下原胶盐析溶液稀释后的吸光度值达到0.3508。在得到的紫胶色酸盐析溶液的基础上,研究了钙盐沉降方法对紫胶色酸产品的析出效果,结果表明,钙盐沉降中,氯化钙用量为3g/L时,提取率即达95.42%,色酸产品中蒽醌类化合物含量达到31.28%,pH为3.633。通过DSC、FTIR的分析发现紫胶色酸产品中所含有的杂质可能主要为钙盐沉降过程中所包裹的紫胶树脂。This approach was mainly concerned with the method for lacaic acid isolation and extraction by salt precipitation after alkaline soluting and impurities removal from raw lac. Factors which influenced the precipitation process were analysed. According to the analysis,a mathematical model for such extraction was set up,therefore the optimal technique conditions were found as follows：NaCI dosage 9.64g,stir rotational speed 800r/min,salt precipitation temperature 34.5% and time 25min,alkaline concentration 0.188mol/L. With such optimized treatment,the absorbence value of the diluted precipitating solution reached 0.3508. Another study was carried out based on such solution,aiming to find the precipitation effect on lacaic acid by adding calcium salt. Results showed that the appropriate dosage of CaCI2 was 3g/L during calcium salt precipitation treating,and it achieved 95.42% extraction rate 31.28% anthroquinones contents at pH3.633. The DSC and FTIR analysis also implied that impurities contained in lacaic acid products were probably capsulated lac resin from the processing period of calcium salt precipitation.

关 键 词：盐析 原胶 紫胶色酸 

分 类 号：TS202.3[轻工技术与工程—食品科学]