Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for producing instant tea powder containing low content of caffeine and crude caffeine product by using fresh tea tree leaves

A low-caffeine, instant tea powder technology, applied in the field of tea processing and crude caffeine products, can solve the problems of non-guaranteed food hygiene quality, high cost, organic solvent residue, etc., so as to improve the decaffeinated effect and solve the problem of waste water. Emissions, the effect of reducing production energy consumption

Inactive Publication Date: 2009-12-23
ZHEJIANG UNIV
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the two methods, the former has no organic solvent residue, and the product quality is good, but the cost is high; the latter has serious organic solvent residue, and the food hygiene quality is not guaranteed.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for producing instant tea powder containing low content of caffeine and crude caffeine product by using fresh tea tree leaves
  • Method for producing instant tea powder containing low content of caffeine and crude caffeine product by using fresh tea tree leaves
  • Method for producing instant tea powder containing low content of caffeine and crude caffeine product by using fresh tea tree leaves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1, the method for directly producing low caffeine instant tea powder and natural caffeine crude product with the raw leaves of tea tree, technological process is as follows:

[0028] 1) Remove caffeine from tea tree leaves: add 0.5m of purified water treated by reverse osmosis into the interlayer extraction tank 3 , into the steam to heat the water to 100 ℃. Put the green leaves of the tea tree through 130°C steam for 17 seconds, add 0.125 kg of tea leaves per liter of water, put the green leaves of the tea tree into the hanging basket (40kg / time) and put them into the extraction tank and sink them into hot water. Inject steam to keep the water temperature at 100°C for 8-12 minutes. Remove the tea leaves and rinse with tap water. Continuously extract 20 times and process 800kg of tea tree leaves in total. After taking out the tea leaves each time, add an appropriate amount of pure water to keep the water level of the extraction tank constant. At the end of...

Embodiment 2

[0040] Embodiment 2, the method for directly producing low caffeine instant tea powder and natural caffeine crude product with the raw leaf of tea tree, carries out following technological process successively:

[0041] 1) Remove caffeine from tea tree leaves: add 0.5m of purified water treated by reverse osmosis into the interlayer extraction tank 3 , put in steam to heat the water to 100°C, add 0.2 kg per liter of water to the tea tree leaves that have been steamed at 135°C for 15 seconds, put them into the extraction tank using a hanging basket (25kg / time) and sink into the hot water. In water, treat at 100°C for 1-5 minutes. Remove the tea leaves and rinse with tap water. Continuously extract 30 times and process 750kg of tea leaves. After taking out the tea leaves each time, add an appropriate amount of pure water to keep the water level of the extraction tank constant. At the end of the treatment, the waste water in the extraction tank was filtered through a duplex fil...

Embodiment 3

[0051] Embodiment 3, the method for directly producing low-caffeine instant tea powder and natural caffeine crude product with the raw leaves of tea tree, carries out the following steps successively:

[0052] 1) Remove caffeine from tea tree leaves: add 0.5m of purified water treated by reverse osmosis into the interlayer extraction tank 3 , put in steam to heat the water to 100°C, multiply the tea leaves that have been steamed at 130°C for 17 seconds at a rate of 0.05 kg of tea leaves per liter of water (100 kg per time) into the hanging basket and put them into the extraction tank and sink into hot water , at 100°C for 10-15 minutes. Remove the tea leaves and rinse with tap water. Continuously process 5 batches of green leaves totaling 500kg. Other operations are the same as in Example 1. After the treatment, a total of 491L caffeine-containing filtrate was obtained, and its caffeine concentration was 6.1g / L.

[0053] 2), tea leaves are chopped: operation is the same as...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The method for preparing low-caffeine instant tea powder and natural caffeine crude product from tea tree leaves directly uses tea tree leaves as raw materials, undergoes steam killing at >125°C, and puts them in hot water at 100°C while hot for decaffeination. Minced, extracted, concentrated, spray-dried or freeze-dried to produce low-caffeine instant tea powder, and at the same time, use waste water with high caffeine concentration after processing tea leaves to filter, concentrate and spray-dry to obtain crude natural caffeine. The decaffeination process does not use organic solvents and other chemical substances, makes full use of tea resources, solves the problem of wastewater discharge generated by the hot water decaffeination process, reduces environmental pollution, and is suitable for large-scale use. The low-caffeine instant tea powder prepared by the technology of the invention has a total catechin content of more than 259 g / kg and a caffeine content of less than 14.2 g / kg. Utilize the method of the present invention, the by-product that obtains---the caffeine crude product, the caffeine content is more than 350g / kg.

Description

technical field [0001] The invention belongs to the field of light industry and chemical technology, and relates to tea processing technology, in particular to a method for directly preparing low-caffeine instant tea powder and natural caffeine crude product from tea tree leaves. Background technique [0002] Tea has multiple functions such as anti-oxidation, anti-cancer, anti-radiation, lowering cholesterol, preventing arteriosclerosis, etc. It is one of the most popular beverages among consumers. However, because tea contains caffeine, an alkaloid that excites the brain and the heart, for some people with neurasthenia, pregnant women, children, and people with weakened heart function, drinking tea with high caffeine content for a long time may cause physical discomfort or other side effects. Low-caffeine tea is a product that can not only meet the demand of these consumer groups for drinking tea, but also avoid the adverse effects of high caffeine content in ordinary tea,...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): A23F3/38
Inventor 梁月荣董俊杰林晨杜颖颖陆建良
Owner ZHEJIANG UNIV