A litchi drying method that can improve the immunomodulatory activity of pulp polysaccharides

Abstract

A disclosed lichee drying method capable of improving pulp polysaccharide immunoloregulation activity is characterized by comprising the following steps: (1) cleaning lichee to clean, draining water, and sending to hot-air drying equipment to perform enzyme deactivating; and (2) sending lichee subjected to enzyme deactivating into a heat-pump drying apparatus, and drying lichee to have a water content of 25% or less, so as to obtain dried lichee. The method helps to improve lichee pulp polysaccharide immunoloregulation activity, and helps to prevent from mildewing during drying, and energy consumption is saved.

Description

technical field

[0001] The invention relates to a fruit drying method, in particular to an energy-saving drying method for litchi that can improve the immune activity of pulp polysaccharides. technical background

[0002] Litchi is a characteristic fruit in the subtropical region, and it occupies an important position in the agricultural and socio-economic development of South my country. Because lychee is not resistant to storage, it is easy to brown and rot after harvesting. At the same time, its production period is concentrated, so it is very difficult and stressful to keep fresh. Dried processing is the main form of litchi processing, accounting for 80% of the total litchi processing. At present, the traditional dried litchi fruit processing method is hot air drying. Hot air drying has the advantages of simple device and convenient operation, but due to the high drying temperature, it is easy to cause food quality degradation and solute loss, it is difficult to retain...

Examples

Embodiment 1

[0017] (1) Select lychees that are free from diseases and insect pests, intact and without cracks, and after cleaning, drain the water on the stainless steel grid.

[0018] (2) Send the drained lychees to the hot air drying equipment for 4 h at 92 °C.

[0019] (3) Turn on the heat pump drying device, keep the temperature in the machine cavity at 55 °C, and the wind speed at 1 m / s, transfer the lychee after greening to the heat pump drying system, and start the heat pump drying process.

[0020] (4) The heat pump drying adopts the intermittent drying mode in which the drying system is turned off for 4 h after drying for 12 h, and the drying-slow cycle is repeated for a total of 3 times to obtain dried litchi fruits.

Embodiment 2

[0022] (1) Select lychees that are free from diseases and insect pests, intact and without cracks, and after cleaning, drain the water on the stainless steel grid.

[0023] (2) Send the drained lychees to the hot air drying equipment for 6 hours at 86°C.

[0024] (3) Turn on the heat pump drying device, keep the temperature in the machine cavity at 50°C, and the wind speed at 1 m / s, transfer the dried lychees to the heat pump drying system, and start the heat pump drying process.

[0025] (4) The heat pump drying adopts the intermittent drying mode in which the drying system is turned off for 3 h after drying for 12 h, and the drying-slow cycle is repeated for a total of 3 times to obtain dried litchi fruits.

Embodiment 3

[0027] (1) Select lychees that are free from diseases and insect pests, intact and without cracks, and after cleaning, drain the water on the stainless steel grid.

[0028] (2) Send the drained lychee into hot air drying equipment for 5 hours at 90°C.

[0029] (3) Turn on the heat pump drying device, keep the temperature in the machine cavity at 55°C, and the wind speed at 1 m / s, transfer the lychee after greening to the heat pump drying system, and start the heat pump drying process.

[0030] (4) The heat pump drying adopts the intermittent drying mode in which the drying system is turned off for 4 h after drying for 10 h, and the drying-slow cycle is repeated for a total of 3 times to obtain dried litchi fruits.

technical field

[0001] The invention relates to a fruit drying method, in particular to an energy-saving drying method for litchi that can improve the immune activity of pulp polysaccharides. technical background

[0002] Litchi is a characteristic fruit in the subtropical region, and it occupies an important position in the agricultural and socio-economic development of South my country. Because lychee is not resistant to storage, it is easy to brown and rot after harvesting. At the same time, its production period is concentrated, so it is very difficult and stressful to keep fresh. Dried processing is the main form of litchi processing, accounting for 80% of the total litchi processing. At present, the traditional dried litchi fruit processing method is hot air drying. Hot air drying has the advantages of simple device and convenient operation, but due to the high drying temperature, it is easy to cause food quality degradation and solute loss, it is difficult to retain...

Examples

Embodiment 1

[0017] (1) Select lychees that are free from diseases and insect pests, intact and without cracks, and after cleaning, drain the water on the stainless steel grid.

[0018] (2) Send the drained lychees to the hot air drying equipment for 4 h at 92 °C.

[0019] (3) Turn on the heat pump drying device, keep the temperature in the machine cavity at 55 °C, and the wind speed at 1 m / s, transfer the lychee after greening to the heat pump drying system, and start the heat pump drying process.

[0020] (4) The heat pump drying adopts the intermittent drying mode in which the drying system is turned off for 4 h after drying for 12 h, and the drying-slow cycle is repeated for a total of 3 times to obtain dried litchi fruits.

Embodiment 2

[0022] (1) Select lychees that are free from diseases and insect pests, intact and without cracks, and after cleaning, drain the water on the stainless steel grid.

[0023] (2) Send the drained lychees to the hot air drying equipment for 6 hours at 86°C.

[0024] (3) Turn on the heat pump drying device, keep the temperature in the machine cavity at 50°C, and the wind speed at 1 m / s, transfer the dried lychees to the heat pump drying system, and start the heat pump drying process.

[0025] (4) The heat pump drying adopts the intermittent drying mode in which the drying system is turned off for 3 h after drying for 12 h, and the drying-slow cycle is repeated for a total of 3 times to obtain dried litchi fruits.

Embodiment 3

[0027] (1) Select lychees that are free from diseases and insect pests, intact and without cracks, and after cleaning, drain the water on the stainless steel grid.

[0028] (2) Send the drained lychee into hot air drying equipment for 5 hours at 90°C.

[0029] (3) Turn on the heat pump drying device, keep the temperature in the machine cavity at 55°C, and the wind speed at 1 m / s, transfer the lychee after greening to the heat pump drying system, and start the heat pump drying process.

[0030] (4) The heat pump drying adopts the intermittent drying mode in which the drying system is turned off for 4 h after drying for 10 h, and the drying-slow cycle is repeated for a total of 3 times to obtain dried litchi fruits.

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