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Method for preparing indigo from fresh strobilanthes cusia leaves

A technology of indigo and fresh leaves, applied in the direction of bisindole indigo indigo dyes, etc., can solve the problem of low yield, achieve the effects of increasing yield, improving production efficiency, and simplifying the production process

Pending Publication Date: 2021-06-04
哈工大机器人南昌智能制造研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mix wood ash, lime and bran into the indigo, add water to mix, heat to 30-40°C, and expose to the air to become blue insoluble indigo with low yield

Method used

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  • Method for preparing indigo from fresh strobilanthes cusia leaves
  • Method for preparing indigo from fresh strobilanthes cusia leaves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The method for preparing indigo from the fresh leaves of horse blue

[0025] Weigh 1 kg of fresh leaves of Malan indigo and place them in tap water with a pH of 3.5, wherein the volume of water is 30 times the mass of the fresh leaves. At 20°C, cover and soak for 48 hours, then filter through a sieve to remove leaf residue. Add alkali to adjust the pH of the soaking solution to 10.0, heat the soaking solution to 60°C, ventilate and stir for 1 hour, and let it stand to cool. The soaking solution was concentrated by rotating at low temperature to collect the crude indigo. RP-HPLC detects that the indigo content is 15.46g / kg.

Embodiment 2

[0027] The method for preparing indigo from the fresh leaves of horse blue

[0028] Weigh 1 kg of fresh leaves of Malan indigo and place them in tap water with a pH of 3.5, in which the volume of water is 30 times the mass of fresh leaves, soak for 48 hours at 30 degrees, ventilate and stir once every 4 hours, and filter through a sieve to remove leaf residue. Add alkali to adjust the pH of the soaking solution to 10.0, heat the soaking solution to 60°C, ventilate and stir for 1 hour, and let it stand to cool. The soaking solution was concentrated by rotating at low temperature to collect the crude indigo. RP-HPLC detects that the indigo content is 16.28g / kg.

Embodiment 3

[0030] The method for preparing indigo from the fresh leaves of horse blue

[0031] Weigh 1 kg of fresh leaves of Malan indigo and place them in tap water with a pH of 3.5, where the volume of water is 10 times the mass of fresh leaves, cover and soak for 48 hours at 40°C, filter through a sieve to remove leaf residue. Add alkali to adjust the pH of the soaking solution to 10.0, ventilate and stir for 1 hour, and let it stand to cool. The soaking solution was concentrated by rotating at low temperature to collect the crude indigo. RP-HPLC detects that the indigo content is 13.97g / kg.

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PUM

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Abstract

The invention discloses a method for preparing indigo from fresh strobilanthes cusia leaves. The method comprises the following steps: (1) carrying out a soaking process for directionally generating indigo; (2) carrying out indigo synthesis; (3) concentrating and coarsely preparing indigo; (4) carrying out indigo purification; and (5) preparing a finished product. According to the invention, indigo precursor substances are promoted to be directionally converted into indigo by controlling soaking PH, soaking temperature, soaking liquid volume, oxygen content and the like of fresh strobilanthes cusia leaves to increase the yield of indigo, lime milk can be replaced by NaOH for adjusting PH so as to facilitate later-stage impurity removal and purification of indigo and improve the yield of indigo, and the indigo is extracted by adopting a low-temperature concentration method, so that the production process is simplified, and the indigo production efficiency is improved.

Description

technical field [0001] The invention belongs to the field of natural product extraction, and in particular relates to a method for preparing indigo from fresh leaves of horse indigo. Background technique [0002] Indigo, the main component of the traditional Chinese medicine Indigo Daisy, has anti-inflammatory and liver-protecting effects. Indigo pigment is one of the oldest pigments known to mankind. It was first extracted from bluegrass plants. It is a water-soluble non-azo colorant and is used as food coloring in its sodium sulfonate salt or its aluminized form. , Widely used in food, medicine and printing and dyeing industries. [0003] Indigo is an ancient dye, which was originally extracted from plants and later developed into chemical synthesis. The method of plant extraction is as follows: pile up the indigo leaves, water them frequently, and let them ferment for 2 to 3 months to form black soil lumps. After being compacted with a mortar, it is called spherical in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B7/02
CPCC09B7/02
Inventor 赵亮刘兆宇
Owner 哈工大机器人南昌智能制造研究院