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KR-20260063661-A - Pellet manufacturing method for analyzing powdered natural dyestuffs and color pellets produced by the same

KR20260063661AKR 20260063661 AKR20260063661 AKR 20260063661AKR-20260063661-A

Abstract

The present invention relates to a method for manufacturing standard natural dye pellets for determining the origin of plant-based natural dyes and tracking color changes due to degradation. It can provide a practical form of color pellet that resolves the problem of liquid sample deterioration and increases the reliability of color measurement, and is useful for tracking color changes and determining the origin of natural dyes.

Inventors

  • 최태호
  • 이상현
  • 이유주
  • 오종섭
  • 현수운

Assignees

  • 충북대학교 산학협력단

Dates

Publication Date
20260507
Application Date
20241030

Claims (20)

  1. A method for manufacturing standard natural dye pellets for determining the origin of plant-based natural dyes and tracking color changes due to deterioration, 1) A step of extracting dye from a plant sample; 2) A step of concentrating the extracted dye and then vacuum drying it to produce a powdered dye; 3) a step of treating the powdered dye with accelerated degradation; and 4) A step of compression molding the above-mentioned degradation-accelerated powder dye into a pellet form by applying a pressure of 20 to 80 MPa; A method for manufacturing standard natural dye pellets, comprising
  2. In paragraph 1, A method for manufacturing standard natural dye pellets, characterized in that the above plant sample is obtained from a plant selected from the group consisting of persimmon juice, madder, rhododendron, acorn cap, wild grape, ash tree, chestnut burr, fresh indigo, pomegranate peel, Styrax japonica, lotus seed shell, gallnut, Lithospermum erythrorhizon, red pine bark, clamweed, indigo, walnut bark, and Polygonum multiflorum.
  3. In paragraph 2, A method for manufacturing standard natural dye pellets, characterized in that the plant sample selected from the group consisting of persimmon juice, wild grape, pomegranate peel, lotus seed shell, and walnut peel is obtained by extracting a dye from the fruit.
  4. In paragraph 2, A method for manufacturing standard natural dye pellets, characterized in that the plant sample selected from the group consisting of madder, scutellaria root, gromwell, and knotweed is obtained by extracting a dye from the roots.
  5. In paragraph 2, A method for manufacturing standard natural dye pellets, characterized in that the plant sample selected from the group consisting of the acorn cup, ash tree, chestnut burr, and red pine bark is obtained by extracting dye from the wood and bark.
  6. In paragraph 2, A method for manufacturing standard natural dye pellets, characterized in that the above-mentioned gallnut plant sample is obtained by extracting a dye from a gall produced by a gallworm parasitizing the leaves of Rhus javanica.
  7. In paragraph 2, A method for manufacturing standard natural dye pellets, characterized in that the plant sample selected from the group consisting of the above-mentioned fresh indigo, Styrax japonica, and clamweed is obtained by extracting a dye from the leaves or stems.
  8. In paragraph 2, A method for manufacturing standard natural dye pellets, characterized in that the above-mentioned indigo plant sample is obtained by fermenting raw indigo.
  9. In paragraph 1, A method for producing standard natural dye pellets, characterized in that the dye extraction is performed using an extraction method selected from the group consisting of hot water extraction, solvent extraction, and pressurized extraction.
  10. In Paragraph 9, A method for producing standard natural dye pellets, characterized in that the above hot water extraction is performed on a plant selected from the group consisting of madder, rhododendron, acorn cap, wild grape, ash, chestnut burr, pomegranate peel, Styrax japonica, lotus seed shell, gallnut, red pine bark, clamweed, green walnut bark, and Polygonum multiflorum.
  11. In Paragraph 9, A method for manufacturing standard natural dye pellets, characterized in that the above solvent extraction is performed on a Lithospermum plant.
  12. In Paragraph 9, A method for manufacturing standard natural dye pellets, characterized in that the above-mentioned pressurized extraction is performed on a plant selected from the group consisting of persimmon and fresh indigo.
  13. In paragraph 1, A method for manufacturing standard natural dye pellets, characterized in that, in step 3) above, the degradation acceleration is performed by a method selected from the group consisting of photodegradation, dry degradation, and wet degradation.
  14. In Paragraph 13, A method for manufacturing standard natural dye pellets, characterized in that the above-mentioned degradation acceleration causes a dye derived from a plant selected from the group consisting of persimmon juice, madder, rhododendron, wild grape, ash tree, pomegranate peel, gromwell, and clamweed to gel.
  15. In Paragraph 14, A method for manufacturing standard natural dye pellets, characterized by additionally including a step of vacuum drying the dye for 70 to 100 hours to prevent the powdered dye from gelling.
  16. In Paragraph 14, A method for manufacturing standard natural dye pellets, characterized by including an additional processing step to powderize the gelled dye.
  17. In Paragraph 16, A method for manufacturing standard natural dye pellets, characterized in that the above additional processing step involves cooling a gelled dye derived from a plant selected from the group consisting of persimmon dye, madder, rhododendron, ash, and pomegranate peel at -20℃ and then vacuum drying it to powder.
  18. In Paragraph 16, A method for manufacturing standard natural dye pellets, characterized in that the above additional processing step involves diluting a gelled dye derived from a plant selected from the group consisting of wild grapes, gromwell, and clamweed in distilled water, then freeze-drying it to powder.
  19. In paragraph 1, A method for manufacturing standard natural dye pellets, characterized by compressing the powdered dye at a preset pressure according to the sugar content of the dye in step 4) above.
  20. In Paragraph 19, A method for manufacturing standard natural dye pellets, characterized in that the powdered dye with a high sugar content is a plant-derived dye selected from the group consisting of persimmon extract, madder, rhododendron, wild grape, ash, pomegranate peel, gromwell, and clamweed, and the powdered dye is compressed into a pellet form by applying a pressure of 60 to 80 MPa.

Description

Pellet manufacturing method for analyzing powdered natural dyestuffs and color pellets produced by the same The present invention relates to a method for manufacturing pellets for the analysis of plant-derived natural dyes and the use thereof. Natural dyes are dyes made from substances derived from nature, such as plants, animals, and microorganisms, and are extracted from their natural state without undergoing chemical synthesis processes. They are widely used in various industrial fields, including food, cosmetics, and textiles, and have the advantage of having less impact on health and the environment compared to artificial dyes. Natural dyes are substances extracted from nature, such as plants, animals, and microorganisms, and are characterized by their ability to maintain color for a long time due to their inherent colors and chemical properties. In particular, natural dyes used in cultural heritage reflect the dyeing techniques, materials, and cultural symbolism of that era; therefore, various types exist in historical records and were used to dye fabrics or paper, or as coloring materials. Natural dyes are organic compounds based on the bonding of carbon and hydrogen, and they can be either animal- or plant-based. Traditionally used natural dyes, with the exception of the animal-based dye *Kerria lacca*, are mostly plant-based, extracted from the leaves, roots, fruits, or inner bark of trees. In the process of preserving and restoring cultural heritage, it is crucial to reproduce original natural dyes or develop new forms. Over time, natural dyes often discolor or fade due to external environmental factors such as ultraviolet (UV) radiation, temperature, and humidity. UV radiation alters the chemical structure of dyes, causing color changes, while temperature and humidity affect the physical stability of dyes, potentially accelerating fading. Consequently, the unique colors of cultural heritage disappear or fade, making it difficult to visually distinguish between the original materials and the original colors. Natural dyes undergo various changes in physical properties depending on the dyeing method, mordant, and type of substrate. The dyeing method affects color expression and durability; mordants can strengthen or alter the bond between the dye and the fiber, while the characteristics of the substrate also influence the dye's fixation and color expression. Due to these diverse variables, changes in the physical properties of natural dyes and the characteristics of mixed materials complicate the analysis and interpretation of natural dyes. Furthermore, to preserve the original form, the analysis of cultural heritage should, in principle, be conducted using non-destructive methods and trace samples, and analyses involving sample collection should be avoided. Therefore, there is a need for objective and systematic research to identify the origin of natural dyes remaining in artifacts, predict their degradation, and diagnose them while minimizing damage to the cultural heritage. Determining the origin of natural dyes and tracking color changes due to degradation is a crucial task that reveals their source and origin by precisely analyzing their chemical and physical components. Various analytical techniques are utilized to identify the origin of natural dyes. Chemical analysis methods include High Performance Liquid Chromatography (HPLC) and Gas Chromatography-Mass Spectrometry (GC-MS), which are used to precisely separate and identify the major components of dyes. HPLC traces raw materials by analyzing the pigments and chemical composition of dyes, while GC-MS aids in determining origin by analyzing volatile and organic compounds. Additionally, Infrared Spectroscopy (IR) and Ultraviolet-Visible Spectroscopy (UV-Vis) play important roles; IR spectroscopy identifies the functional groups and molecular structure of dyes, while UV-Vis spectroscopy analyzes their color and physical properties. Physical analysis methods include fluorescence microscopy and scanning electron microscopy (SEM). Fluorescence microscopy analyzes the physical distribution and characteristics of dyes by observing their fluorescence properties, while scanning electron microscopy (SEM) studies the deposition patterns and morphology of dyes by observing the surface of dye-dyed fibers at high resolution. These analytical methods provide important information for inferring the physical properties and raw materials of dyes. Since naturally dyed materials contain a mixture of various substances in addition to natural dyes, it is necessary to extract and use the dye in a liquid state to accurately analyze the raw materials. However, liquid samples are susceptible to color changes depending on extraction conditions, and issues such as liquid degradation and difficulties in color measurement may arise. Color measurement is particularly challenging in a liquid state because dye components can mix or deteriorate. Consequently, specialized equ