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Method for processing instant tea powder without pesticide residue

A technology for instant tea powder and pesticide residues, which is applied to tea, pre-extraction tea treatment, food science and other directions, can solve problems such as affecting the quality of finished products, pesticide residues failing to meet standard requirements, loss of tea flavor substances, etc. The effect of quality, thorough removal of pesticide residues, and reduced flavor loss

Active Publication Date: 2008-05-14
DAMIN FOODSTUFF ZHANGZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the residual pesticides in tea include water-soluble pesticides and fat-soluble pesticides, only most of the water-soluble pesticides and a small part of fat-soluble pesticides can be removed by washing method, and the pesticide residues in the finished product cannot meet the standard requirements, and the washing method will cause some tea flavor substances loss, affecting the quality of the finished product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Take 1 kg of green tea raw materials and add it to 10 kg of hot water at 80°C, soak and extract for 20 minutes, and filter with a 160-mesh filter cloth to prepare a tea filtrate. After the tea filtrate was cooled to 40°C, 1.5 g of tannase was added, stirred, and allowed to stand for 30 minutes for enzymatic hydrolysis to prepare a tea enzymatic hydrolysate. After concentrating the tea enzymatic hydrolysate through a reverse osmosis membrane to 20-25 percent, add dichloromethane for extraction, stand still for stratification, remove the water phase, recover the dichloromethane, and then pass the gas-liquid mixing pump to reduce the concentration of 5ppm The ozone is passed into the tea extract and degrades for 30 minutes. Finally, the degraded tea extract is spray-dried, the air inlet temperature is 180°C-185°C, the outlet air temperature is 80°C-85°C, and the feed amount is set according to the liquid concentration to obtain 100 grams of instant tea powder. The residue is n...

Embodiment 2

[0015] Take 1 kilogram of oolong tea raw material into 10 kilograms of 85°C hot water, soak and extract for 20 minutes, and filter with a 160-mesh filter cloth to prepare a tea filtrate. After the tea filtrate was cooled to 40°C, 1.5 g of tannase was added, stirred, and allowed to stand for 30 minutes for enzymatic hydrolysis to prepare a tea enzymatic hydrolysate. After concentrating the tea enzymatic hydrolysate through a reverse osmosis membrane to 20-25 percent, add an equal amount of ethyl acetate for extraction, stand still for stratification, remove the water phase, recover ethyl acetate, and then pass through a gas-liquid mixing pump. The ozone at a concentration of 5 ppm was passed into the tea extract for 30 minutes to degrade. Finally, the degraded tea extract is spray-dried, the inlet air temperature is 185°C-190°C, the outlet air temperature is 85°C-90°C, and the feed amount is set according to the liquid concentration to obtain 100 grams of instant tea powder. The re...

Embodiment 3

[0017] Take 1 kg of black tea raw materials and add it to 10 kg of hot water at 90°C, soak and extract for 20 minutes, and filter with a 160-mesh filter cloth to prepare a tea filtrate. After the tea filtrate was cooled to 40°C, 1.5 g of tannase was added, stirred, and allowed to stand for 30 minutes for enzymatic hydrolysis to prepare a tea enzymatic hydrolysate. After the reverse osmosis membrane is concentrated and the chloroform is extracted, the ozone with a concentration of 5 ppm is passed into the tea extract through a gas-liquid mixing pump and degraded for 120 minutes. Finally, the degraded tea extract is spray-dried, the inlet air temperature is 190℃-200℃, the outlet air temperature is 90℃-98℃, and the feed amount is set according to the liquid concentration to obtain 100 grams of instant tea powder. The residue is not more than 0.01 mg / kg. Certain auxiliary materials can be added according to specific requirements and packaged into finished products.

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Abstract

The invention relates to a processing method of instant tea powder without pesticide residues, which uses tea leaves as raw materials and is completed through processes such as extraction, filtration, concentration, extraction, ozone treatment, and drying. Due to the use of ozone degradation and organic solvent extraction to remove most of the residual water-soluble and fat-soluble pesticides, compared with the traditional washing method, the loss of flavor is reduced, the yield and quality of the product are improved, and the removal of pesticide residues is more thorough. the health of the drinker.

Description

Technical field [0001] The invention relates to a processing method of instant tea powder, in particular to a processing method of instant tea powder without pesticide residues. Background technique [0002] The well-known method of removing pesticide residues in the production of instant tea powder mainly adopts the water washing method, that is, adding an appropriate amount of water to the raw tea to remove the pesticides, and then making instant tea powder after extraction, concentration, spray drying or freeze drying . Since the pesticide residues in tea include water-soluble pesticides and fat-soluble pesticides, the water washing method can only remove most of the water-soluble pesticides and a small part of the fat-soluble pesticides. The pesticide residues of the finished products cannot meet the standard requirements, and the water washing method will cause some tea flavor substances Loss affects the quality of the finished product. Summary of the invention [0003] The...

Claims

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Application Information

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IPC IPC(8): A23F3/22A23F3/10
Inventor 欧阳晓江岳鹏翔蒋艾青
Owner DAMIN FOODSTUFF ZHANGZHOU CO LTD
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