Method for separating and preparing instant tea by use of multilayer membranes
A technology of instant tea and multi-layer film, applied in the directions of tea, application, tea extraction, etc., can solve problems such as damage to beneficial components of tea, inability to effectively remove impurities and residues of tea concentrate, to ensure consistency and overcome solvent residues and aroma loss, removal of pesticide residues
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[0027] Example 1
[0028] (1) Choose 1kg of Pu'er tea, soak it in 20L cold water at 10°C for two hours, and obtain a tea concentrate after preliminary clarification.
[0029] (2) Use a 0.1μm pore size microfiltration membrane to filter to obtain a clear solution of the tea concentrate. In this embodiment, in order to increase the speed, a pressure of 0.2 MPa can be increased during filtration.
[0030] (3) Use an ultrafiltration membrane with a molecular weight of 100,000 for the second filtration to obtain an ultrafiltrate of the tea concentrate. The main purpose of this step is to further improve the clarity of the tea concentrate, while removing macromolecular impurities, including colloids, starch, fiber, and protein. In order to speed up the filtration, the pressure of 0.2MPa can be increased during filtration. In this method, the purpose of ultrafiltration is to remove macromolecular impurities and retain beneficial components as much as possible, so a higher molecular weig...
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[0035] Example 2
[0036] Sensory evaluation results
[0037] 100 people were randomly selected to drink the Dahongpao instant tea prepared by the patent application method. After calculating the average number, the following table 1:
[0038]
Example Embodiment
[0039] Example 3
[0040] The physical and chemical indexes of green tea instant tea prepared by the patent application method are shown in Table 2:
[0041] Table 2
[0042]
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