【作者】 刘玉洁；

【导师】 尹红； 陈志荣；

【作者基本信息】 浙江大学 ， 应用化学， 2010， 硕士

【摘要】 β-胡萝卜素是一种重要的食用天然色素,具有较强的着色能力,广泛用作食品和药品等行业的营养强化和着色,研究β-胡萝卜素水性分散体系的研磨制备工艺参数对分散体系特征参数的影响及后者对β-胡萝卜素分散体系颜色的影响具有重要意义。本文首次较系统地研究了研磨工艺条件对β-胡萝卜素颗粒粒径及其分布的影响。结果表明β-胡萝卜素颗粒粒径及跨距随改性淀粉用量或研磨转速增加呈先减小后增大的变化趋势;研磨时间延长,分散体系颗粒粒径及跨距减小。分散体系中抗氧化剂抗坏血酸钠盐用量增加,β-胡萝卜素浓度增大。本文首次较系统地研究了β-胡萝卜素分散体系颜色的影响因素。对低浓度β-胡萝卜素分散体系颜色影响因素的研究结果表明β-胡萝卜素浓度增大或颗粒平均粒径减小,分散体系明度L~*降低,色度值a~*和b~*、饱和度c~*升高,β-胡萝卜素浓度增大,色相角h°变化幅度不大,颗粒平均粒径减小,色相角h°升高;β-胡萝卜素全反式异构体含量降低或辛癸酸甘油酯用量增加,分散体系明度L~*、色度值b~*、饱和度c~*和色相角h°升高,色度值a~*降低。对高浓度β-胡萝卜素分散体系颜色影响因素的研究结果表明β-胡萝卜素浓度或辛癸酸甘油酯用量对高浓度分散体系颜色的影响较小;β-胡萝卜素颗粒平均粒径减小或全反式异构体含量降低,高浓度分散体系明度L~*、色度值b~*、饱和度c~*和色相角h°升高,颗粒平均粒径减小,色度值a~*升高,全反式异构体含量降低,色度值a~*降低。更多还原

【Abstract】 β-carotene is an important edible natural pigment and has strong coloring ability. It is widely used as nutrition enhancer and colorant in foods and medicines. The preparation process ofβ-carotene dispersions by milling was investigated in an aqueous medium in the presence of a hydrocolloid. Effects of factors on the color ofβ-carotene dispersions were also studied.The effects of process conditions onβ-carotene particle size and its distribution were first systematically discussed in this paper. The results show that the particle size and span decreased first, and then increased with the increase of modified starch content or milling rotational speed. The particle size and span decreased with the increase of milling time. With the increase in the amount of sodium ascorbate in dispersions,β-carotene concentration increased.The effects of factors on the color of diluteβ-carotene dispersions were first systematically researched. The results show that with either increasing the particle concentration or decreasing the mean particle size, L* value decreased, but a* and b* values and chroma increased. The hue-angle increased with decreasing the mean particle size, but did not change significantly with increasing the particle concentration. When all-trans-isomer content decreased or octyl and decyl glycerate content increased, L*, b*, chroma and hue-angle values increased, but a* value decreased.The effects of factors on the color of high concentration ofβ-carotene dispersions were also studied. The results show that the effect of the particle concentration or octyl and decyl glycerate content on the color was unremarkable. L*, b*, chroma and hue-angle values increased when the mean particle size or all-trans-isomer content decreased respectively. a* value increased with decreasing the mean particle size, but decreased with decreasing all-trans-isomer content.更多还原