锁阳膳食纤维的制备及其物理性质

Preparation of Cynomorium songaricum Dietary Fibers and Investigation of Their Physical Properties

摘要:

以锁阳为原料，制备锁阳膳食纤维。锁阳粉碎成黄豆大小颗粒，由体积分数95%乙醇提取去除脂溶性物质，残渣分别由半胱氨酸加维生素C水溶液或纯水在60 ℃下浸泡提取48 h，清洗残渣、烘干粉碎过40目筛，测定制得的两种膳食纤维的物理特性。半胱氨酸酸溶液处理的膳食纤维其持水性为9.20 g/g、溶胀性为7.5 mL/g，水处理的膳食纤维这两种性质分别是5.83 g/g和4.4 mL/g；半胱氨酸酸溶液处理后所得膳食纤维的明显质量优于水处理所得膳食纤维。半胱氨酸酸溶液可将大分子缩合鞣质降解为可溶性的小分子，在水洗过程中被除去，得到更纯的膳食纤维。

Abstract:

Two kinds of dietary fibers were prepared from Cynomorium songaricum. Crushed stems of C. songaricum particles with diameters around 3 mm were defatted with ethanol. The defatted C. songaricum were divided into two portions. One portion was treated with cysteine and vitamin C solution and the other portion was treated with distilled water for 48 h at 60 ℃. Then the residues were collected by filtration and washed with distilled water. After being dried, physical properties of the dietary fibers were measured. The water retention capability and hydration capability of the dietary fibers pretreated with cysteine or without cysteine were 9.20, 5.83 gram and 7.5, 4.4 mL water per gram product, respectively. These data indicated that the dietary fiber pretreated with cysteine is better in quality than that pretreated without cysteine. High molecular weight condensed tannins could be degraded to small molecular derivatives by cysteine in acid solution. The small molecular derivatives could be washed out with water to obtain dietary fiber purer than the one prepared without cysteine.