红枣色素提取工艺及稳定性研究
毕业论文关键词： 红枣色素；稳定性；微波辅助法；超声波辅助法
Study on the extraction and stability of red pigment from Jujube
Abstract:This paper is a study on the extraction process and stability of jujube pigment. By with jujube and jujube powder as raw material, using the solvent extraction, ultrasonic assisted and microwave-assisted method for extracting red pigment from red jujube, effect comparison of different extraction methods on red pigment extraction, the extraction process of red jujube pigment were preliminary research. Through the single factor experiment, the extraction agent concentration, extraction temperature, ratio of solid to liquid ratio, extraction time, pH value, jujube skin and jujube meat 6 single factor of red jujube pigment extraction effect influence, and on this basis arranged orthogonal test, to determine the optimum condition is: extracting agent NaOH concentration is 0.3mol/L, extraction temperature of 70 ℃, the ratio of material to liquid 1:35 (g ：mL), extraction time is 4h. The stability of red pigment was studied by the strong oxidant and reducing agent. The results showed that the stability of the red pigment was better for reducing agent, but the stability of the strong oxidant was poor.
Key Words: Jujube pigment；Stability；Microwave assisted method；Ultrasonic assisted method
目 录
1 前言 1
1.1 红枣简介 1
1.2 红枣的功效及作用 1
1.3 食用天然色素 2
1.4 天然色素的研究方法 3
1.5 食用天然色素的研究现状 4
1.6 本实验研究意义及内容 4
2 材料与方法 5
2.1材料与仪器设备 5
2.1.1 试验原料 5
2.1.2 试验试剂 5
2.1.3 主要仪器和设备 5
2.2 实验方法 6
2.2.1 最佳提取剂的选择 6
2.2.2 最佳实验原料的选择 6
2.2.3 提取剂浓度对红枣色素提取的选择 6
2.2.4 提取温度对红枣色素提取的选择 6
2.2.5 料液比对红枣色素提取的选择 7
2.2.6 提取时间对红枣色素提取的选择 7
2.2.7 pH值对红枣色素提取的选择 7
2.2.8 枣皮和枣肉对红枣色素提取的选择 7
2.2.9 设计正交试验 8
2.2.10 还原剂对红枣色素稳定性的影响 8
2.2.11 强氧化剂对红枣色素稳定性的影响 8
2.2.12 超声波辅助法提取红枣色素 8
2.2.13 微波辅助法提取红枣色素 8
3 结果与分析 9
3.1 单因素实验 9
3.1.1 最适吸收波长的选择 9
3.1.2 最佳提取剂的选择 9
3.1.3 最适试验原料选择 10