Method for extracting red pigment from green pin needles

A technology of red pigment and pine needles, which is applied in tea treatment before extraction, chemical instruments and methods, azo dyes, etc., can solve the problems of less pine bark resources, inconvenience, unreported technology, etc., and improve the quality of pine needle tea , increase soup color, low cost effect

Active Publication Date: 2014-12-03
SHANDONG FOREST SCI RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with pine needles, the amount of pine bark resources is relatively small, especially it is inconvenient to peel the bark from standing trees
Although there are report

Method used

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  • Method for extracting red pigment from green pin needles
  • Method for extracting red pigment from green pin needles
  • Method for extracting red pigment from green pin needles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The influence of the water content of embodiment 1 extraction time and extracting liquid etc. on extraction effect

[0029] The invention adopts 1% hydrochloric acid methanol to extract the red pigment of black pine (Pinus thunbergii Parl.). Studies have found that when leaching black pine needles with methanol hydrochloric acid, the initial extract is dominated by green pigments, and almost no red pigments are extracted (within 5 hours) ( figure 1 d). With the prolongation of the extraction time, the hydrochloric acid methanol solution gradually changed from blue-green to yellow-green. On the surface of pine needles ( figure 1 a) and endothelial cells ( figure 1 b) Red pigments gradually appear in the skin, and most of the red pigments produced at this time are adsorbed on the macromolecular fatty acid esters of the stratum corneum. As the extraction time continues to prolong, along with the decomposition of the extracted chlorophyll components under light (Feng et...

Embodiment 2

[0032] The influence of embodiment 2 pine needle moisture content on extraction effect

[0033] The influence of the moisture content of pine needles on the extraction effect is shown in Figure 4 and Figure 5 , Figure 4 The data showed that the amount of red pigment extracted from dehydration treatment increased significantly, and there was an obvious linear correlation between the water content of pine needles and the absorbance of red pigment in the extract ( Figure 4 a). After the dried pine needles were rehydrated, compared with the control pine needles without drying treatment, there was no statistically significant difference in the red pigment extract ( Figure 4 b).

[0034] This test shows that the process of extracting pine needle red pigment with hydrochloric acid methanol is a process of gradual oxidation and polymerization, and the drying treatment of pine needles is beneficial to increase the extraction amount of pine needle red pigment. In addition, in ...

Embodiment 3

[0035] Embodiment 3 pine needle red pigment component analysis

[0036] Studies have shown that the red solution produced by continuous extraction of green pine needles in acidic methanol solution turns blue-purple after alkaline precipitation ( Figure 6 a-Ld, Figure 6 b-Ld), although the alkaline precipitate of the bark extract has a tendency to become lavender, its degree is much lower than that of pine needles ( Figure 6 a-Pd, Figure 6 b-Pd). This indirectly suggested that anthocyanins or anthocyanins were formed during the extraction of pine needles. Moreover, proanthocyanidins are easily converted into anthocyanins under acidic environmental conditions.

[0037] At the same time, the process of extracting pine needle red pigment with methanol hydrochloride in the present invention is a gradual oxidative polymerization process, and the colorless oligomeric proanthocyanidins are converted into reddish-brown high-polymeric proanthocyanidins through oxidative polymeri...

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PUM

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Abstract

The invention discloses a method for extracting a red pigment from green pin needles. The method comprises the following steps: extracting green pin needles with 1% hydrochloric acid methanol solution or 1% hydrochloric acid ethanol solution to obtain red-brown extract liquid, then precipitating by adding alkali, and then performing centrifugation and drying to obtain purplish-red powder which is the crude red pigment of pin needles. Experiments prove that the red pigment extracted from pin needles according to the method is a mixture of high-polymeric procyanidine and anthocyanidin as well as derivatives thereof; the invention proves that red procyanidine and anthocyanidin are produced during extraction, thereby greatly improving the yield of the red pigment of pin needles, and simultaneously large-scale production of the red pigment of pin needles provides a feasible choice for improving the color of pin needle tea and improving the quality of pin needle tea; and the method is simple, practical and low in cost, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a pigment extraction method, in particular to a method for extracting red pigment from green pine needles. Background technique [0002] Various pigments, such as anthocyanins, widely exist in plant organs, especially petals, fruit peels, young leaves and autumn leaves (Chalker-Scott, 2002; Field et al., 2001; Gould et al., 1995; Zhang and Wang, 2008). Moreover, the red pigments in many plant fruits often become raw materials and additives in the food processing industry and the pharmaceutical industry. Among related products, thearubigin has been invented and reported in China (Xiao Weixiang et al., 1987, 1997). Pine needle tea has been sold as a special health drink, but the soup color is relatively light. The evergreen needles of pine trees, especially the green pine needles during the growing season, contain very little red pigment, while the content of colorless proanthocyanidins (catechin and its derivatives) is relati...

Claims

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Application Information

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IPC IPC(8): C09B61/00A23F3/14A23L1/275
Inventor 王斐王静邢尚军
Owner SHANDONG FOREST SCI RES INST
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