TH15809U - The process of extracting pigments from teak leaves by boiling. - Google Patents

Abstract

Page 1 of 1. Summary of the Invention: This document describes the process of extracting pigments from teak leaves using a decoction method. It begins with harvesting teak leaves by pruning the lower branches of the trunk and selecting fully grown leaves. These leaves are then dried at 50-60 degrees Celsius for 24 hours. The leaves are then ground into a powder and extracted using a decoction method with water, or a methanol mixture in a ratio of 1:0.25-5 parts, or an ethanol mixture in a ratio of 1:0.25-5 parts, or a solution of acid or alkali with a pH range of 1-12. The ratio is 1 kilogram of dry teak leaf powder to 5-20 liters of solvent. The extract is filtered to obtain a clear solution, which is then dried. This extracted pigment is then used to produce natural dyes from teak leaves. The resulting teak leaf pigments will have several shades, including brown, reddish-brown, and reddish-brown.

Claims (2)

Revised 17/10/2018. Claims 1. The process of extracting pigments from teak leaves by boiling consists of the following steps: a. Teak leaf harvesting: Teak leaves are harvested by pruning branches at the lower part of the trunk (1/3 of the trunk height). b. Teak leaf powder preparation: Teak leaves are washed and cleaned, then dried in the dark at a temperature of 50-60 degrees Celsius for 24 hours. The leaves are then ground into powder. c. Pigment extraction from teak leaf powder: Using a ratio of 1 kilogram of dry teak leaf powder to 5-20 liters of solvent, the powder is extracted by boiling with a solvent such as water, water mixed with methanol in a ratio of 1:0.25-5 parts, water mixed with ethanol in a ratio of 1:0.25-5 parts, water mixed with acid, or water mixed with alkali. To obtain a pH range of 1-12, continuously stir while boiling, maintaining the temperature between 70-90 degrees Celsius, and boil for 1-3 hours. Then let it cool. D. Filtration step for the color extract obtained from step C to obtain a clear extract. E. Re-extracting step for the remaining teak leaf powder from step D according to step C. Filter out the residue and combine the color extract obtained in this step with the color extract obtained from step D. F. Drying step for the color extract obtained from step E. If the solvent is water, water mixed with methanol, or water mixed with ethanol, evaporate the solvent from the color extract using a rotary evaporator under vacuum and dry it into a powder using a freeze dryer. If the extraction is by boiling with water, water mixed with acid, or water mixed with alkali, dry it into a powder using a freeze dryer. 2. Process for extracting pigments from teak leaves by boiling according to claim 1, where the teak leaves are obtained by selecting leaves that are 1) young teak leaves with a light green to reddish-brown color. And mature teak leaves that are dark green and have soft hairs on the underside. ----------- Page 1 of 1 page. Claims. 1. The process of extracting pigments from teak leaves by boiling consists of the following steps: a. Leaf harvesting: Harvest teak leaves by pruning branches at the lower part of the trunk (1/3 of the trunk height). Select young teak leaves that are light green with a reddish-brown tint, and mature leaves that are dark green and have soft hairs on the underside. b. Powder preparation: Wash the teak leaves thoroughly, dry them in the dark at 50-60 degrees Celsius for 24 hours, and then grind them into a powder. c. Pigment extraction: Use a ratio of 1 kilogram of dry teak leaf powder to 5-20 liters of solvent. Extract the pigments by boiling the powder with a solvent such as water, water mixed with methanol in a ratio of 1:0.25-5 parts, water mixed with ethanol in a ratio of 1:0.25-5 parts, water mixed with acid, or water mixed with alkali. To obtain a pH range of 1-12, continuously stir while boiling, maintaining the temperature between 70-90 degrees Celsius, and boil for 1-3 hours. Then let it cool. D. Filtration step: Filter the color extract obtained from step C to obtain a clear extract. E. Re-extracting step: Remove the remaining teak leaf powder from step D using step C. Filter to separate the solids and combine the color extract obtained from step D. F. Drying step: If the solvent is water, water mixed with methanol, or water mixed with ethanol, evaporate the solvent from the color extract using a rotary evaporator under vacuum and dry it into a powder using a freeze dryer. If the extraction was done by boiling with water, water mixed with acid, or water mixed with alkali, dry it into a powder using a freeze dryer. 2. The process of extracting pigments from teak leaves by boiling, as per claim 1, where the teak leaves are obtained through a selection process that includes: young teak leaves with a light green to reddish-brown color, and mature teak leaves with a dark green color and soft hairs on the underside.