思茅松树皮原花青素的化学降度提取工艺

以云南思茅松树皮为原料，以亚硫酸为降度试剂，探讨提取次数、提取时间、提取温度、料液比、降度试剂用量等对思茅松原花青素降解效果的影响，结果表明：提取次数、提取时间、提取温度、料液比、降度试剂用量均对花青素提取有不同程度的影响；综合分析得出最佳降解工艺条件为：提取温度90℃，提取时阊100min，料液比1：10，亚硫酸用量22％，共提取3次；在该提取条件下，原花青素的提取率为7．52％，原花青素的平均聚合度为3．40。

Sulfurous Acid Based Degradation of Proanthocyanidins of Pinus kesiya var. langbianensis Bark

Taking the tree bark of Pinus kesiya var. langbianensis as raw material, sulfurous acid as chemical reagent to degrade procyanidins from the bark to proanthocyanidins, the influence of the extraction times, the dura- tion, temperature, solid-liquid ratio and the reagent dosage for the extraction upon the proanthocyanidins degrada- tion was studied. The results showed that each factor had a certain effect on the proanthocyanidins extraction. The comprehensive analyses indicated that the optimal parameters for the extraction of proanthocyanidins from the tree bark were 3 times of extraction under 90℃ with l：10（g/mL） of solid-liquid ratio, 22% of sulfite in total liquid, and each extraction time duration was 100 min. With such technology, the extraction rate of proanthocyanidins reached 7.52%, and their average polymerization degree was redueed to 3.40.