Process for extracting natural pigment from rehmannia root

Abstract

The invention relates to a method for preparation of natural colouring matter from the rehmannia root, which can effectively solves the problem that using the rehmannia root to prepare the natural colouring matter as food additives. The concrete technical project includes: washing, airing the hydrosphere of the rehmannia root, chopping, adding absolute ethyl alcohol to soak or ultrasonic shock to extract, filtering, depressing to recover alcohol, depressing to dry to yellow powder and immediately hermetically packing. The method is of simple craft and easy to operate, the extracted pigment is emerald yellow and the nature is stable, which can be used for lagging cover for tablet and food and preparation of health products, which improves the utilization value of the fresh rehmannia root and also provides a new source for exploitation of natural colouring matter.

Description

1. Technical field [0001] The invention relates to a method for preparing natural pigments, in particular to a method for preparing natural pigments from rehmannia glutinosa. 2. Background technology [0002] With the improvement of people's quality of life, people pay more and more attention to their health, and the requirements for food additives are becoming more and more healthy. Returning to nature and advocating green health care have become the trend of development. However, food pigments are widely used in food, daily chemical and pharmaceutical industries. With the progress of medical toxicology and biological experiments, it has been found that many varieties of chemically synthesized pigments have serious chronic toxicity and carcinogenicity, and gradually Replaced by natural coloring. As food additives and medical excipients, natural pigments have the characteristics of high safety and natural and bright colors, and some natural pigments also have therapeutic, p...

AI Technical Summary

Problems solved by technology

Scientific research shows that when rehmannia was developed as a medicine, it was found that the yellow pigment in rehmannia can be extracted, which can not only be widely used in the pharmaceutical industry, but also be used as a pigment (additive) in food, especially finely ground rehmannia cannot be used as processed raw rehmannia The raw materials of Rehmannia glutinosa, except for the next year's seeds, have low medicinal value and are often treated as waste, which not only causes waste of resources, but also brings difficulties to waste disposal. Finely crushing Rehmannia glutinosa, developing and extracting fresh rehmannia pigment, not only has high application value, but also has extremely low cost. Then, how to develop and eat rehmannia glutinosa is a new topic under study and is also a concern of the public.