Lotus seed drying method

A drying method and technology for lotus seeds, which are applied in the direction of preserving seeds through drying, can solve the problems of long drying time, gelatinization of lotus seed starch, and low efficiency, and achieve the effects of improving drying rate, no rehydration rate, and increasing hardness

Inactive Publication Date: 2018-12-14
江西省科学院食品工程创新中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of long drying time of lotus seeds with low-temperature hot air, low efficiency in the later stage of drying, and gelatinization of lotus seed starch due to high-temperature hot-air drying, the present invention adopts low-temperature hot-air drying in the early stage, and then adopts temperature-controlled microwave final drying mode to dry large-grained lotus seeds in stages , in order to improve drying efficiency and product quality, and provide processing methods for efficient and high-quality production of lotus seeds

Method used

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Embodiment 1

[0019] The lotus seed variety is Jiangxi Guangchang Bailian. The lotus shells were peeled off with a lotus seed peeling machine to obtain fresh lotus seeds, and the lotus seeds were placed in a hot air drying device. The drying conditions were set at a drying temperature of 60 °C and a wind speed of 1 m / s. The water content of lotus seeds on a wet basis was obtained by weighing at 105 °C. When the moisture content of the lotus seeds on a wet basis drops to 29%, the lotus seeds are dried by microwave to the end of drying. The microwave drying conditions are: specific power 1.5W / g, drying wind speed 1m / s, surface temperature range 50℃-55℃. The average drying time is 328min, the product hardness is 115.5N, and the rehydration rate is about 54.95%.

Embodiment 2

[0021] The lotus seed variety is Jiangxi Guangchang Bailian. The lotus shells were peeled off with a lotus seed peeling machine to obtain fresh lotus seeds, and the lotus seeds were placed in a hot air drying device. The drying conditions were set at a drying temperature of 60 °C and a wind speed of 1 m / s. The water content of lotus seeds on a wet basis was obtained by weighing at 105 °C. When the water content of the lotus seeds on a wet basis drops to 35%, the lotus seeds are dried by microwave to the end of drying. The microwave drying conditions are specific power 2W / g, drying wind speed 1m / s, surface temperature range 55°C-60°C. The average drying time is 233min, the product hardness is 118.3N, and the rehydration rate is about 54.53%.

Embodiment 3

[0023] The lotus seed variety is Jiangxi Guangchang Bailian. The lotus shells were peeled off with a lotus seed peeling machine to obtain fresh lotus seeds, and the lotus seeds were placed in a hot air drying device. The drying conditions were set at a drying temperature of 60 °C and a wind speed of 1 m / s. The water content of lotus seeds on a wet basis was obtained by weighing at 105 °C. When the water content of the lotus seeds on a wet basis drops to 25%, the lotus seeds are dried by microwave to the end of drying. The microwave drying conditions are specific power of 1W / g, drying wind speed of 1m / s, and surface temperature range of 50°C-55°C. The average drying time is 323min, the product hardness is 102.7N, and the rehydration rate is about 53.92%.

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Abstract

The invention discloses a lotus seed drying method. The process procedures comprise the steps of drying fresh lotus seeds to a certain moisture content by adopting hot air, and drying to safe moisturecontent by adopting surface temperature controlled microwaves. The optimized stage drying process comprises the following steps: drying by adopting hot air with the drying air speed of 1m / s and the drying temperature of 60 DEG C at an early stage; drying by adopting microwaves having the specific power of 1.5W / g, the average surface temperature of 52.5 DEG C and the drying rate of 1m / s when the moisture content of the lotus seed wet base is reduced to 29%, and ending the drying process. Compared with the process of drying by hot air at 60 DEG C for 360 minutes, the process in the invention has the advantages that the drying time is 328 minutes and is obviously shortened, the hardness of the dried lotus seeds is 115.5N and is obviously increased, the rehydration rate is 54.95%, and any significant differences do not exist. The lotus seed product dried by adopting the method disclosed by the invention is controllable in quality, and the lotus seed drying time is greatly shortened. The stage drying method involved in the invention can be further used for drying large-granule agricultural products, chemicals and other products.

Description

technical field [0001] The invention relates to a lotus seed drying method. Background technique [0002] Lotus seeds are a unique agricultural product with advantages in China. They are rich in nutrients and are deeply loved by the public. Drying is an important means of production and processing of dried lotus seeds. The lotus seeds have large granules and high starch content. Unsuitable drying process seriously affects the drying time, energy consumption and drying quality of lotus seeds. It takes a long time to dry in the sun, and it is easy to oxidize the polyphenols of lotus seeds, resulting in blackening of the product; it is difficult to control the heat of charcoal fire baking, and it is easy to be yellowed and burnt. Traditional hot-air drying is low in cost and widely used, but the drying time of lotus seeds with low-temperature hot-air is too long, and high-temperature hot-air drying tends to gelatinize starch and harden the product. During microwave drying, t...

Claims

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Application Information

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IPC IPC(8): A23B9/08
CPCA23B9/08
Inventor 徐建国徐刚张森旺顾震刘胜平张绪坤李华栋
Owner 江西省科学院食品工程创新中心
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