CN107028074A - A kind of storage method of Cordyceps militaris - Google Patents

Abstract

A storage method for Cordyceps militaris, comprising: soaking Cordyceps militaris in citric acid aqueous solution to solidify, filtering the water, laying it flat on a material board, putting it into a material box of a vacuum freeze dryer, and precooling the material at a temperature of -40°C to - At 50°C, keep it for 2.0 hours to 2.5 hours; vacuumize, when the vacuum pressure drops below 50Pa, start to heat up, continue to vacuumize, after the temperature of the material bin rises to 35°C, turn off the equipment, take out the dried Cordyceps militaris, and obtain frozen Dried Cordyceps militaris; when eating, freeze-dried Cordyceps militaris pupae are soaked in water for 20-30 minutes to obtain fresh edible Cordyceps militaris. After pretreatment with citric acid soaking solution, the dried product has reduced fragility and is more conducive to long-term storage. It will not be moldy and deteriorated, and will not be eaten by insects, and its organizational structure and appearance are better preserved. The rehydration effect of Cordyceps militaris is the best. After rehydration, the dipping juice is golden and clear, and the color and appearance of the grass body are close to that of fresh Cordyceps militaris. It can be eaten as a dish on the table.

Description

A kind of storage method of Cordyceps militaris

technical field

The invention relates to a storage method of Cordyceps militaris.

Background technique

Cordyceps militaris is rich in protein and amino acids, and contains more than 30 trace elements needed by the human body. It is a top-notch nourishing product. With the development of society and the enhancement of people's awareness of health care, the output of artificially cultivated Cordyceps militaris has also increased year by year, but storage and transportation have become problems. If it is not processed in time, it will quickly rot and deteriorate.

Vacuum freeze-drying technology is a better method for food storage and processing, which can retain the color, aroma, taste and nutritional components of food to the greatest extent. The development history of freeze-drying technology in my country is relatively short, and there is a lack of systematic research on the theory of freeze-drying process and related disciplines, and the lack of systematic analysis and reference value of freeze-drying process parameters. At present, most of the freeze-dried products are fruits and vegetables, aquatic products, meat and poultry, etc., but they are rarely used in the processing of edible fungi, and the products after freeze-drying of edible fungi are brittle and fragile, which is not conducive to storage. Therefore, vacuum freeze-drying technology is used to produce Cordyceps militaris jelly Dried products need to be developed urgently.

Contents of the invention

The technical problem to be solved by the present invention is to provide a vacuum freeze-drying method of Cordyceps militaris that is not fragile, does not decolorize, has a complete tissue structure, and has less loss of efficacy and nutritional components, which is convenient for long-term storage and transportation, and provides a new method for the deep processing of Cordyceps militaris. method.

Technical scheme of the present invention is:

A storage method for Cordyceps militaris, comprising the following steps:

Step 1: Pretreatment of fresh Cordyceps militaris

Take the fresh artificially cultivated Cordyceps militaris out of the incubator, cut off the root, remove impurities, and avoid destroying the integrity of the entity;

The second step: preparation of Cordyceps militaris infusion

Adding citric acid into water is prepared to prepare Cordyceps militaris infusion, citric acid: water = 0.3:100～0.6:100 (mass ratio);

The third step: Cordyceps militaris vacuum freeze-drying treatment

1. Soak Cordyceps militaris in the above-mentioned Cordyceps militaris infusion for 5 to 10 minutes, solidify, drain and lay flat on the material board;

2. Operation steps of vacuum freeze dryer:

①Start the vacuum freeze dryer, turn on the freeze-drying chamber for refrigeration, and put the material plate containing the treated Cordyceps militaris into the material box;

②When the pre-cooling temperature of the material reaches -40℃～-50℃, keep it for 2.0 hours to 2.5 hours, and the material setting effect is the best at this time;

③Vacuumize, when the vacuum pressure drops below 50Pa, start to heat up and continue to vacuumize;

④ After the vacuum freeze dryer has been running for more than 18 hours, and the temperature of the material bin is 35°C, turn off the equipment, take out the dried Cordyceps militaris, obtain freeze-dried Cordyceps militaris, and store them in a sealed bag away from light;

Step 4: Rehydration of freeze-dried Cordyceps militaris

When eating, the freeze-dried Cordyceps militaris is soaked in water for 2-3 minutes to obtain fresh edible Cordyceps militaris.

Further, when the temperature is raised in step ③, the sublimation drying temperature is -40°C to -30°C, and the eutectic point is -28.5°C.

Further, the vacuum pressure drops to 50Pa-48Pa, and the temperature starts to rise.

Further, the temperature of the material bin is 35°C, and the vacuum degree is 10Pa-12Pa.

Further, the equipment runs for 18 to 20 hours, and the temperature of the material bin is raised to 35°C.

Further, the moisture content of the dried Cordyceps militaris is 3.8%-4.1%.

Beneficial effects of the present invention:

1. The dried product after pretreatment with citric acid soaking solution reduces the fragility and is more conducive to long-term storage. It will not be moldy or spoiled, and it will not be eaten by insects, and its organizational structure and appearance are better preserved.

2. The finished product has good rehydration property. After rehydration, the soaking juice is golden and clear, and the color and appearance of the grass body are not significantly different from those of fresh Cordyceps militaris.

3. The moisture content of dried Cordyceps militaris is 3.8%-4.1%. The color of the finished product is golden and bright without oxidative browning. and nutrients.

detailed description

Below in conjunction with embodiment, further illustrate the present invention.

Example 1

1. Material pretreatment

①Weigh 200g of fresh artificially cultivated Cordyceps militaris after pretreatment, soak in the extract of Cordyceps militaris for 5 minutes, solidify and set aside;

②Cordyceps militaris extract formula: citric acid 12g, water 2000mL;

2. Vacuum freeze drying

① Spread Cordyceps militaris on the material board;

②Start the equipment, put the material plate containing the treated Cordyceps militaris into the material box;

③When the pre-cooling temperature of the material reaches -40°C, keep it for 2.5 hours;

④When the vacuum pressure drops to 48Pa, start to heat up;

⑤ After the equipment has been running for 18 hours and the temperature of the silo is 35°C, turn off the equipment, take out the dried Cordyceps militaris, and store them in a sealed bag away from light;

3. Rehydration of freeze-dried Cordyceps militaris

When eating, 10 freeze-dried Cordyceps militaris pupae are soaked in 150 mL of water for 2 minutes to obtain fresh edible Cordyceps militaris.

Example 2

1. Material pretreatment

①Weigh 200g of fresh artificially cultivated Cordyceps militaris after pretreatment, soak in the extract of Cordyceps militaris for 10 minutes, solidify and set aside;

② Formula of Cordyceps militaris extract: 3g citric acid, 1000mL water;

2. Vacuum freeze drying

① Spread Cordyceps militaris on the material board;

②Start the equipment, put the material plate containing the treated Cordyceps militaris into the material box;

③When the pre-cooling temperature of the material reaches -50°C, keep it for 2.0 hours;

④When the vacuum pressure drops to 50Pa, start to heat up;

⑤ After the equipment has been running for 20 hours, the vacuum pressure has dropped to 12Pa, and the temperature of the material bin has reached 35°C. Turn off the equipment, take out the dried Cordyceps militaris, and store them in a sealed bag away from light;

3. Rehydration of freeze-dried Cordyceps militaris

When eating, 12 freeze-dried Cordyceps militaris pupae are soaked in 200 mL of water for 3 minutes to obtain fresh edible Cordyceps militaris.

Example 3

1. Material pretreatment

①Weigh 200g of fresh artificially cultivated Cordyceps militaris after pretreatment, soak in the extract of Cordyceps militaris for 8 minutes, solidify and set aside;

② Formula of Cordyceps militaris extract: 5g citric acid, 1000mL water;

2. Vacuum freeze drying

① Spread Cordyceps militaris on the material board;

②Start the equipment, put the material plate containing the treated Cordyceps militaris into the material box;

③ When the pre-cooling temperature of the material reaches -45°C, keep it for 135 minutes;

④When the vacuum pressure drops to 50Pa, start to heat up;

⑤ After the equipment has been running for 20 hours, the vacuum pressure has dropped to 12Pa, and the temperature of the material bin has reached 35°C. Turn off the equipment, take out the dried Cordyceps militaris, and store them in a sealed bag away from light;

3. Rehydration of freeze-dried Cordyceps militaris

When eating, 15 freeze-dried Cordyceps militaris pupae were soaked in 200 mL of water for 2.5 minutes to obtain fresh edible Cordyceps militaris.

comparative example

1. Material pretreatment

Fresh artificially cultivated Cordyceps militaris weighs 200g after pretreatment;

2. Vacuum freeze drying

① Spread the fresh Cordyceps militaris on the material board;

②Start the equipment, turn on the freeze-drying chamber for refrigeration, and put the material plate containing the treated Cordyceps militaris into the material box;

③ When the pre-cooling temperature of the material reaches -40°C to -50°C, keep it for 2.0 hours to 2.5 hours. In this comparative example, take -40°C and keep it for 2.5 hours as an example;

④When the vacuum pressure drops to 48Pa, start to heat up;

⑤ After the equipment has been running for 18 hours and the temperature of the material bin reaches 35°C, turn off the equipment, take out the dried Cordyceps militaris, and store them in sealed bags away from light.

The Cordyceps militaris prepared by the method of the invention can be eaten after being soaked in water for 2 to 3 minutes, and can reach the best state after being soaked for 5 minutes. After rehydration, leave it at room temperature for 12 hours, the dipping juice still remains golden and clear, and the color and appearance of the grass are close to that of fresh Cordyceps militaris. It can be eaten as a side dish or stew.

Table 1 Comparison table of freeze-dried finished products of Cordyceps militaris after immersion in citric acid infusion

Note: "+" indicates the degree of fragility; the more + signs, the more friable.

Table 2 takes the finished product of example 2 as an example and compares the comparison table in terms of storage effect

Note: "+" indicates the storage effect of the finished product; the more "+" signs, the better the appearance shape and color.

The above are only specific embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (6)

1. a kind of storage method of Cordyceps militaris, it is characterized in that：

Comprise the following steps：

(1) fresh Cordyceps militaris pretreatment

Fresh Artificial Cultivation of Cordyceps militaris Link is taken out from incubator, root is cut off, impurity is removed, it is to avoid destruction entity is complete Property；

(2) preparation of Cordyceps militaris immersion liquid

Citric acid is added to the water and is configured to Cordyceps militaris immersion liquid, the mass ratio of the citric acid and water is 0.3:100~0.6: 100；

(3) Cordyceps militaris vacuum freeze drying is handled

Cordyceps militaris is soaked 5 minutes~10 minutes in Cordyceps militaris immersion liquid, curable type, be laid in after drainage in material plate；Start true Vacuum freecing-dry machine, opens dry storehouse refrigeration, the material plate equipped with Cordyceps militaris after processing is loaded in body feed tank；Material precooling temperature When degree reaches -40 DEG C~-50 DEG C, kept for 2.0 hours~2.5 hours；Vacuumize, when vacuum pressure is down to below 50Pa, start Heating, continues to vacuumize, and vacuum freeze drier is run more than 18 hours, and material bin temperature is after 35 DEG C, pass hull closure is taken out Dried Cordyceps militaris, obtains lyophilized Cordyceps militaris；

(4) when eating, lyophilized Cordyceps militaris pupa is soaked in water -3 minutes 2 minutes, obtains eating Cordyceps militaris raw.

2. the storage method of Cordyceps militaris according to claim 1, it is characterized in that：During heating, lyophilization temperature is -40 DEG C To -30 DEG C, eutectic point is -28.5 DEG C.

3. the storage method of Cordyceps militaris according to claim 1, it is characterized in that：Vacuum pressure is down to 50Pa~48Pa, opens Begin to heat up.

4. the storage method of Cordyceps militaris according to claim 1, it is characterized in that：Material bin temperature is 35 DEG C, and vacuum is 10Pa~12Pa.

5. the storage method of Cordyceps militaris according to claim 1, it is characterized in that：Vacuum freeze drier run 18 hours~ 20 hours, material bin temperature was warming up to 35 DEG C.

6. the storage method of Cordyceps militaris according to claim 1, it is characterized in that：Dried Cordyceps militaris moisture content is 3.8%~4.1%.