A method for improving the stability of natural color during the drying process and storage of red roses
A drying process, rose technology, applied in the fields of food science, food preservation, application, etc., to achieve the effect of improving drying efficiency, stable color and simple processing method
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Embodiment 1
[0039] Embodiment 1, the microwave drying preparation method of red rose corolla tea
[0040] Preparation of konjac-β-cyclodextrin compound solution: Weigh 2.0g of β-cyclodextrin, dissolve it in 100mL of distilled water, and use a constant temperature magnetic stirrer to stir at 65°C and 200r / min for 10min to obtain β- Cyclodextrin solution, and then weigh 0.15g of konjac powder, add the prepared β-cyclodextrin solution, and stir for 10 minutes according to the above method to prepare konjac-β-cyclodextrin composite solution for future use.
[0041]Shandong Pingyin double-petalled red roses, choose bright, bright, complete appearance, and no pests, clean the soil and weeds attached to the surface, soak 100g fresh red rose corollas in 0.5% roselle pigment, 0.3% chlorine Calcium chloride, 0.5% sodium ascorbate compound solution, soaking time is 30min. Take it out and drain it quickly, and put it in a -20°C low-temperature refrigerator for quick freezing, and the freezing time i...
Embodiment 2
[0050] Embodiment 2, the radio frequency drying preparation method of red rose corolla tea
[0051] First, the preparation of the coating solution, the specific operation method is as described in Example 1.
[0052] The raw material is selected from the fresh corolla of double-petaled red roses in Pingyin, Shandong Province. Select rose flowers with bright colors and no damaged petals, remove surface impurities, weigh about 100g of rose corolla, soak in 0.5% roselle pigment, 0.3% chlorine Calcium chloride, 0.5% sodium ascorbate compound solution, soaking time is 30min. After quick draining, it was quickly frozen in a -20°C low-temperature refrigerator for 5 hours. Roses are tiled in the radio frequency drying chamber, and the distance between the upper and lower plates of the radio frequency drying equipment is adjusted to be 130mm, and the roses are dried by radio frequency, taken out after drying for 90min, and quickly coated with a spouted bed (0.15% konjac polysaccharide...
Embodiment 3
[0055] Embodiment 3, the medium and short wave infrared drying preparation method of red rose corolla tea
[0056] First, the preparation of the coating solution, the specific operation method is as described in Example 1.
[0057] The raw materials are selected from the fresh corolla of double-petaled red roses in Pingyin, Shandong. Select rose flowers with bright colors and complete shapes, remove surface impurities, weigh about 100g of rose corolla, soak in 0.5% roselle pigment, 0.3% chloride Calcium, 0.5% sodium ascorbate compound solution, soaking time is 30min. After quick draining, it was quickly frozen in a -20°C low-temperature refrigerator for 5 hours. Carry out medium-short wave infrared drying, drying temperature is 60 ℃, take out after drying 90min, carry out spouted bed rapid film coating (0.15% konjac polysaccharide solution and 2.0% β-cyclodextrin solution), and then carry out under the same conditions Medium and short wave infrared drying, drying for 30min, ...
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