蔷薇红景天色素的提取及稳定性的研究

Study on Extraction and Stability of Natural Edible Red Pigment from Rhodiola Rosea

本文对蔷薇红景天色素的提取方法和色素的基本性质进行了研究。通过研究发现,红景天色素提取时95%(pH=3)的乙醇水溶液提取效果最佳,色素的最大吸收峰在314nm处;日光,温度和大多数金属离子Ca2+,Mg2+,M n2+,Z n2+等对红景天色素的稳定性影响不大,但是N a+,Fe2+,K+对红景天色素有增色的趋势。这种色素不仅耐光性好,而它的耐糖性也很好。虽然在碱性环境下,红景天色素p H稳定性较差,但在酸性条件下,其p H稳定性较好。通过初步研究发现该色素具有一定的开发利用价值。

The technology of extracting natural edible red pigment from Rhodiola and the characteristics of the pigment have been studied in this paper. It was clear from the results that among the several chemicals tested for the extraction of the red pigments, 95% ethanol (pH3) was optimum for the extraction of Rhodiola pigment with λmax of the Rhodiola pigment was 314nm. This Rhodiola pigment was stable when they were affected by the sunshine and temperature. Most of the metal ions(Ca2+, Mg2+,Mn2+, Zn2+) could not interfere the stability of the pigment except Fe3+. Rhodiola pigment was stable only under acid condition. The results showed that the pigment was worth of exploiting and utilizing. It might be used as one of the resources of naturale diblep igments.