Method for preparing centifolia rose scented tea by vacuum freezing and drying

A technology of vacuum freeze-drying and rose tea, applied in the direction of reducing the alkali content of tea, can solve the problems of affecting product quality, fading during storage, loss of flavor, etc., and achieve the effect of better color, no elimination rate, and uniform color.

Inactive Publication Date: 2016-03-23
YUNNAN LIDU FLOWERS DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the deficiencies of the prior art, to provide a method for preparing Qianye rose flower tea by vacuum

Method used

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  • Method for preparing centifolia rose scented tea by vacuum freezing and drying

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Experimental program
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Effect test

Embodiment 1

[0047] A method for preparing Qianye rose tea by vacuum freeze-drying, comprising the steps of:

[0048] Step (1), screening of rose buds: screening of buds whose sepals are fully open and with 3 petals in the outermost layer of the bud, remove all impurities, eliminate buds with disease and insect spots and deformed buds, and remove the length of the buds Flowers larger than 3.5cm and diameter larger than 2.5cm, and flower buds with a length of less than 2cm and a diameter of less than 2cm are removed;

[0049] Step (2), pre-freezing in trays: Freeze the rose buds obtained in step (1) at -31°C for 2.1 hours under normal pressure to obtain frozen buds;

[0050] Step (3), vacuum drying: The frozen flower buds obtained in step (2) are heated and dried under 119pa to obtain dried flower buds; electric heating and drying are divided into 5 stages, the first stage The drying temperature is 29°C, continuous working for 245 minutes; the second heating temperature is 34°C, continuous...

Embodiment 2

[0053] A method for preparing Qianye rose tea by vacuum freeze-drying, comprising the steps of:

[0054] Step (1), screening of rose buds: screening of buds whose sepals are fully open and with 3 petals in the outermost layer of the bud, remove all impurities, eliminate buds with disease and insect spots and deformed buds, and remove the length of the buds Flowers larger than 3.5cm and diameter larger than 2.5cm, and flower buds with a length of less than 2cm and a diameter of less than 2cm are removed;

[0055] Step (2), pre-freezing in trays: Freeze the rose buds obtained in step (1) at -32°C for 2 hours under normal pressure to obtain frozen buds;

[0056] Step (3), vacuum drying: The frozen flower buds obtained in step (2) are heated and dried under 120pa to obtain dried flower buds; the electric heating and drying are divided into 5 stages, the first stage The drying temperature is 30°C, continuous working for 240 minutes; the second heating temperature is 35°C, continuo...

Embodiment 3

[0059] A method for preparing Qianye rose tea by vacuum freeze-drying, comprising the steps of:

[0060] Step (1), screening of rose buds: screening of buds whose sepals are fully open and with 3 petals in the outermost layer of the bud, remove all impurities, eliminate buds with disease and insect spots and deformed buds, and remove the length of the buds Flowers larger than 3.5cm and diameter larger than 2.5cm, and flower buds with a length of less than 2cm and a diameter of less than 2cm are removed;

[0061] Step (2), pre-freezing in trays: freeze the rose buds obtained in step (1) at -33°C for 1.9 hours under normal pressure to obtain frozen buds;

[0062] Step (3), vacuum drying: The frozen flower buds obtained in step (2) are dried by electric heating at 121pa to obtain dried flower buds; the electric heating drying is divided into 5 stages, the first stage The drying temperature is 31°C, continuous working for 235 minutes; the second heating temperature is 36°C, conti...

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Abstract

The invention relates to a method for preparing centifolia rose scented tea by vacuum freezing and drying and belongs to the technical field of processing of scented tea. The method comprises the following four steps: screening fresh rose flower buds, filling the fresh rose flower buds into a disc and pre-freezing, drying in vacuum, and cooling and packaging. The problems of conventional drying that aroma is lost and the color is seriously faded after the raw materials are heated, and the color is faded in a storage process and the like so that the quality of products is influenced are solved very well through heating by sections, rapidly rising the temperature, sterilizing for short time and drying at a low-temperature and low-pressure state. The method for preparing the centifolia rose scented tea keeps the inherent aroma of the flower buds, the color and luster are relatively good, and the flower buds are not faded after a long period; in a vacuum freezing process, compared with tea which is commonly dried, the surface area of the tea is improved by 200 times, so that the brewing performance of the scented tea and the dissolution rate of effective components of the scented tea are greatly improved, and the quality upgrading and benefit maximization are realized.

Description

technical field [0001] The invention belongs to the technical field of scented tea processing, and in particular relates to a method for preparing Qianye rose scented tea by vacuum freeze-drying. Background technique [0002] Rose tea is a kind of scented tea in the reprocessed tea in China. There are two styles, one is made of tea leaves and half-open rose flowers, and the other is a single rose bud, half-open flower or petal. Made dry. Dried rose buds are not only a kind of rose tea, but also a precious medicinal material. It is rich in citronellol, eugenol, phenylhexyl alcohol, zinc, potassium, sodium, calcium, selenium and other trace elements. The content of moth alcohol is as high as 60%, and the content of eugenol and phenylhexanol is 1%. When drinking tea, the taste is rich and fragrant, and the aroma is long, refreshing. Traditional Chinese medicine believes that rose buds have the effects of regulating qi and relieving depression, promoting blood circulation and...

Claims

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Application Information

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IPC IPC(8): A23F3/36
Inventor 王伟王其刚杨泽军董金金郑淑彦
Owner YUNNAN LIDU FLOWERS DEV CO LTD
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