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.
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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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