天然栀子黄色素的低温真空干燥研究  

Low-temperature Vacuum Drying of Natural Gardenia Yellow Pigments

作　　者：刘伟[1,2,3,4,5] 黄立新[1,2,3,4,5] 张彩虹[1,2,3,4,5] 

机构地区：[1]中国林业科学研究院林产化学工业研究所 [2]生物质化学利用国家工程实验室 [3]国家林业局林产化学工程重点开放性实验室 [4]江苏省生物质能源与材料重点实验室,江苏南京210042 [5]中国林业科学研究院林业新技术研究所,北京100091

出　　处：《林产化学与工业》2011年第1期57-62,共6页Chemistry and Industry of Forest Products

基　　金：国家林业局重点科研项目(2011-02);中国林科院林业新技术研究所基本科研业务费专项基金(CAFINT2010K05)

摘　　要：以加热板温度、干燥箱内真空度、料液的质量分数和料层厚度为影响因素,研究了天然栀子黄色素低温真空干燥制粉的优化工艺,设计了L9(34)的正交试验。当干燥产品达到一致的含水量时,对其色价(CV)、色差(CD)等指标以及干燥时间进行了分析。结果表明:加热板温度对产品的色价、色差以及干燥时间影响最大;料层厚度对栀子黄色素的色价有较大影响。在真空度0.09 MPa,料液质量分数20%以及料层厚度7 mm的单因素对比实验中,加热板温度为55℃时的干燥时间较35℃时缩短了21.05%,可见加热板温度对干燥时间影响很大;而料液质量分数和真空度对产品品质以及干燥时间影响相对较小。得到的栀子黄色素低温真空干燥制粉的最佳工艺条件为:加热板温度45℃,料液质量分数为20%,料层厚度为5 mm,真空度为0.09 MPa,验证试验得到的栀子黄色素粉末品质为:含水量4.35%,色价87.8,色差74.12,干燥过程耗时1 360 min。The low-temperature vacuum drying of natural Gardenia yellow pigment was in vestigated in this paper. Parameters of heating temperature, vacuum, sample concentration and sample thickness were taken as affecting factors. L9 （ 3^4 ） orthogonal experimental design was used to optimized the process. After the dried products reached the homogeneous moisture content, color value（CV） , color difference（CD） of the product and drying time were analyzed. It was found that color value, color difference and drying time were significantly aftected by the heating temperature. Color value were affected greatly by the sample thickness. Form the comparison experiment of single-factor, drying time for heating temperature at 55 ~C was 21.05 % shorter than that at 35 ℃. Sample concentration and the vacuum had relatively less impact on product quality and drying time. The optimal conditions were obtained as follows： heating temperature 45 ℃, sample concentration 20 %, sample thickness 5 mm and the vacuum of 0.09 MPa. Under these conditions, the properties of Gardenia yellow pigment powder were： moisture content of 4.35 % , color value of 87.8, and color difference of 74.12. The whole diving time was 1 360 rain.

关 键 词：低温真空干燥 栀子黄色素 色价 

分 类 号：TQ351.0[化学工程] TQ02