After column chromatographic separation, re-crystallization treatment and supercritical fluid precipitation treatment, the purity of lutein is improved.

粗提物经柱层析分离，重结晶，再经过超临界流体沉淀处理后，可提高叶黄素的纯度。

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The co precipitation behavior and the effects of impurity ions on the crystallization properties of yttrium base heavy rare earth carbonate were investigated.

本文对钇基重稀土碳酸盐沉淀过程中杂质铁、铝离子的共沉淀行为以及对碳酸稀土的结晶性能和结晶效果的影响进行了研究。

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No crystallization or precipitation occurred in the product, and the acidity and shelf-life were satisfactory. The drink was featured by dark brown colour, pleasant taste and long after-smell.

实验表明该配方生产的双歧保健醋饮料不会引起结晶、沉淀，也不会影响酸度及保存期，颜色呈深红褐色、质地醇厚、滋味酸甜、气味绵长。

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