求翻译：天然色素因安全无毒、色泽自然、营养价值高、药理功效好等优点，而得到广泛应用和快速发展。文章介绍了天然色素的几种提取、纯化方法及原理，比较了各种方法的优缺点，并对天然色素的研究与开发做了一定的展望。是什么意思？

Natural pigments for safe non-toxic, natural color, nutritional value, high pharmacological effect, advantages, and are widely used and rapid development. The article describes several of the natural pigment extraction, purification method and principle, compare the advantages and disadvantages of v

Because of the security against non-toxic natural pigments, color natural, high nutritional value, pharmacological efficacy advantages such as good, and are widely used and fast development. article describes a few of the natural pigment extraction, purification methods and theory, comparative advan

Natural light disposition safe non-toxic, luster nature, nutritional value high, pharmacology effect good and so on merits, but obtains the widespread application and the fast development.The article introduced natural pigment several kind of extractions, the purification method and the principle, c

Safe non-toxic, natural color, natural pigment pharmacological effect of high nutritional value, as well as good, and widely and rapidly. Article describes several methods for extraction and purification of natural pigments and principle, comparative advantages and disadvantages of a variety of meth

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