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Normal temperature fresh-keeping processing method of green tea

A processing method and technology of green tea, which are applied in the processing field of green tea fresh-keeping at room temperature, can solve problems such as unsolved storage problems of green tea, failure to achieve green tea storage at room temperature, and unsatisfactory fresh-keeping effect, so as to improve green tea grade and social and economic efficiency, avoid Dissipation and odor, the effect of convenient source of raw materials

Inactive Publication Date: 2005-12-14
江苏省无锡江大大学科技园有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned traditional tea preservation method has high preservation costs, does not achieve the purpose of green tea preservation at room temperature, and does not solve the storage problems of green tea shelves and home conditions, and the preservation effect is not very satisfactory
After the refrigeration method is adopted, the tea leaves will quickly oxidize and deteriorate due to moisture absorption after being taken out of the cold storage; the drying method will cause the moisture content of the green tea to be too low and the brittleness will increase. If vacuum is added, the tea leaves will be very fragile and brittle

Method used

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  • Normal temperature fresh-keeping processing method of green tea

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Effect test

Embodiment 1

[0020] In this embodiment, 120 kg of Biluochun Mingqian tea is taken and packed into a packaging bag made of 0.07mm aluminum foil. Then the mixed gas with a volume percentage of 10 parts of nitrogen and a volume percentage of 90 parts of carbon dioxide is filled into an aluminum foil packaging bag through a pipeline for modified atmosphere treatment, and the oxygen content of the modified atmosphere treatment is 0.4%. This not only reduces the nitrogen content, but also maintains the integrity of the tea. After the modified atmosphere treatment, the packaging bag is sealed with a heat-sealing packaging machine, thereby realizing the oxygen barrier packaging and isolating the contact between the tea and oxygen. After the packaging bag is sealed, the electromagnetic waves generated by the pulse electromagnetic wave generator are used to irradiate the packaged green tea raw materials for 30 minutes, thereby inhibiting the activities of various oxidases in the green tea. The puls...

Embodiment 2

[0023] Take 300 kilograms of Wuxi Haocha Mingqian tea, the thickness of the aluminum foil packaging bag is 0.07mm, the volume percentage of nitrogen gas is 20 parts, the volume percentage of carbon dioxide is 80 parts during the controlled atmosphere treatment, and the oxygen content of the controlled atmosphere treatment is 0.3%; use pulsed electromagnetic waves Irradiate for 30 minutes with a voltage of 187V, a field strength of 20V / cm, a frequency of 300Hz, and a pulse width of 50ns. After 12 months of green tea made by the processing method in Example 1, the retention rate of chlorophyll reached 91%, the retention rate of vitamin C was 93.5%, the retention rate of tea polyphenols was 96.2%, the retention rate of free amino acids was 99%, and the aroma The retention rate was 91.9%.

Embodiment 3

[0025] Take 80 kg of Biluochun Mingqian tea, the thickness of the aluminum foil packaging bag is 0.07mm, the volume percentage of argon in the inert gas is 100 parts, and the oxygen content of the modified atmosphere is 0.3%; the pulse electromagnetic wave is irradiated for 30 minutes, the voltage is 187V, the field strength 20V / cm, frequency 300Hz, pulse width 50ns. After 12 months, the green tea made by the processing method in Example 1 and Example 2 had a chlorophyll retention rate of 89.1%, a vitamin C retention rate of 93.2%, a tea polyphenol retention rate of 96.9%, and a free amino acid retention rate of 96.9%. 99.4%, and the aroma retention rate is 92.5%.

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Abstract

The invention relates to a processing method for keeping green tea fresh at room temperature, and belongs to the technical field of processing human daily necessities. It mainly uses green tea to be packed in packaging bags for modified atmosphere treatment and oxygen barrier packaging. The modified atmosphere treatment uses a mixed gas of nitrogen and carbon dioxide to fill the packaging bag, and then uses pulsed electromagnetic waves to irradiate the packaged green tea. storage. The invention has simple production process and low production cost, can inhibit the activity of various oxidases in green tea, and prevent the oxidation of various active ingredients in green tea; because the oxygen-resistant packaging is used to avoid the loss and odor of green tea aroma components; no additives are used, It achieves the effect of keeping green tea fresh at room temperature, and realizes keeping green tea fresh under home conditions; it can preserve the flavor, trace elements and vitamins of new tea for a long time, thereby greatly improving the quality of green tea and social and economic benefits.

Description

Technical field: [0001] The invention relates to a processing method for keeping green tea fresh at room temperature, and belongs to the technical field of processing human daily necessities. Background technique: [0002] The main reason for the quality deterioration of tea during storage is the oxidation reaction of the active ingredients in it. Before the present invention was made, traditional green tea preservation was mainly carried out by reducing temperature, reducing water content and reducing oxygen content in the environment. This traditional green tea preservation method is described in "Hubei Agricultural Science", 200(3), 70-72, "Freshkeeping and Processing" 2002, 2(1) 16-18, "Tea Newsletter" 2002, 24(1)37 All have been reported in articles such as -39, and its common feature is to prepare the activity of various oxidases in green tea, prevent the oxidation of various active ingredients in green tea, and reach the fresh-keeping purpose. In summary, the main m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A23F3/06
Inventor 毛忠贵陈国安彭昌亚卢泽民
Owner 江苏省无锡江大大学科技园有限公司
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