Asparagus strips and preparation method thereof

Abstract

The preparation method comprises the following steps: heating fresh asparagus strips in a free oscillation type parallel pole plate radio frequency heating system with the power of 6kW and the frequency of 27.12 MHz for 2-4 minutes, taking out the fresh asparagus strips, and quickly cooling the fresh asparagus strips to about 4 DEG C in a refrigerator; setting the temperature of the heat pump drying machine to 35-45 DEG C and the humidity to 35-40%, putting the asparagus strips into the heat pump drying machine, filling nitrogen, when the oxygen content of the heat pump drying machine is higher than 3-5%, repeating the nitrogen filling operation, circularly treating for 3-5 hours, taking out the asparagus sample tray, putting the asparagus sample tray in a normal-temperature environment for balancing for 20-30 minutes, putting the asparagus sample tray into the heat pump drying machine again, and carrying out heat preservation for 20-30 minutes under the conditions of 45-55 DEG C and the humidity to 30-35%. Treating for 3-5 hours; and taking out the asparagus strips, packaging with nitrogen, and storing at 4 DEG C. The asparagus strips prepared by the method disclosed by the invention can be effectively prevented from browning and spoilage, meanwhile, the problems of soft tissues, nutrient loss, unsafe eating and the like caused by traditional drying are solved, and the prepared asparagus strips are uniform in internal texture, bright in color and luster and quick in rehydration.

Description

technical field

[0001] The invention belongs to the technical field of asparagus processing, in particular to a preparation method of asparagus strips and asparagus strips prepared by the preparation method. Background technique

[0002] Asparagus is rich in a variety of amino acids, proteins and vitamins, and its content is higher than that of ordinary fruits and vegetables, especially asparagine and trace elements selenium, molybdenum, chromium, manganese, etc. in asparagus, which can regulate body metabolism and improve body immunity. The efficacy of asparagus has strong inhibitory and pharmacological effects in the prevention and treatment of hypertension, heart disease, leukemia, blood cancer, edema, cystitis, etc. In recent years, with the enhancement of people's health awareness, the demand for asparagus increase yearly.

[0003] Drying is one way to keep asparagus from spoiling. There are many methods for drying asparagus, such as sun drying, boiling, drying, spray...

Examples

Embodiment 1

[0022] A preparation method of asparagus strips, comprising:

[0023] (1) Arranging asparagus strips: Select fresh asparagus with a diameter of 14mm, rinse them with running water, cut them into 4cm strips, drain the water, and get asparagus strips for use; place the asparagus strips in the same direction as the head and tail. In the sample tray made of polypropylene, the sample tray is 400mm long, 270mm wide and 20mm high, and the distance between the top and bottom and left and right of the asparagus strips is 1.2cm;

[0024] (2) Radio frequency heating treatment of asparagus strips: The tray was placed in a 6kW, 27.12MHz free-oscillating parallel plate radio frequency heating system (Strayfield International Ltd., workingham, UK), the distance between the plates: 10cm, and the radio frequency equipment was used for rapid heating for 3min After that, take it out and put it in the refrigerator to quickly cool to about 4 °C, and then heat the asparagus strips;

[0025] (3) Th...

Embodiment 2

[0029] A preparation method of asparagus strips, comprising:

[0030] (1) Arranging asparagus strips: Select fresh asparagus with a diameter of 12mm, rinse with running water, cut asparagus strips into 3cm strips, drain the water, and get asparagus strips for use; place the asparagus strips in the same direction as the head and tail. In the sample tray made of polypropylene, the sample tray is 400mm long, 270mm wide and 20mm high, and the distance between the top and bottom and left and right of the asparagus strips is 1cm;

[0031] (2) RF heating treatment of asparagus strips: The tray was placed in a 6kW, 27.12MHz free-oscillating parallel-plate RF heating system (Strayfield International Ltd., workingham, UK), the distance between the plates: 9cm, and rapid heating for 2min using RF equipment After that, take it out and put it in the refrigerator to quickly cool to about 4 °C, and then heat the asparagus strips;

[0032] (3) The first heat pump drying treatment of asparagu...

Embodiment 3

[0036] A preparation method of asparagus strips, comprising:

[0037] (1) Arranging asparagus strips: Select fresh asparagus with a diameter of 16mm, rinse them with running water, cut them into 5cm strips, drain the water, and get asparagus strips for use; place the asparagus strips in the same direction as the head and tail. In the sample tray made of polypropylene, the sample tray is 400mm long, 270mm wide and 20mm high, and the distance between the top and bottom and left and right of the asparagus strips is 1.5cm;

[0038](2) Radio frequency heating treatment of asparagus strips: The tray was placed in a 6kW, 27.12MHz free-oscillating parallel plate radio frequency heating system (Strayfield International Co., Ltd., workingham, UK), the distance between the plates: 12cm, and the radio frequency equipment was used for rapid heating for 4min After that, take it out and put it in the refrigerator to quickly cool to about 4 °C, and then heat the asparagus strips;

[0039] (3...

technical field

[0001] The invention belongs to the technical field of asparagus processing, in particular to a preparation method of asparagus strips and asparagus strips prepared by the preparation method. Background technique

[0002] Asparagus is rich in a variety of amino acids, proteins and vitamins, and its content is higher than that of ordinary fruits and vegetables, especially asparagine and trace elements selenium, molybdenum, chromium, manganese, etc. in asparagus, which can regulate body metabolism and improve body immunity. The efficacy of asparagus has strong inhibitory and pharmacological effects in the prevention and treatment of hypertension, heart disease, leukemia, blood cancer, edema, cystitis, etc. In recent years, with the enhancement of people's health awareness, the demand for asparagus increase yearly.

[0003] Drying is one way to keep asparagus from spoiling. There are many methods for drying asparagus, such as sun drying, boiling, drying, spray...

Examples

Embodiment 1

[0022] A preparation method of asparagus strips, comprising:

[0023] (1) Arranging asparagus strips: Select fresh asparagus with a diameter of 14mm, rinse them with running water, cut them into 4cm strips, drain the water, and get asparagus strips for use; place the asparagus strips in the same direction as the head and tail. In the sample tray made of polypropylene, the sample tray is 400mm long, 270mm wide and 20mm high, and the distance between the top and bottom and left and right of the asparagus strips is 1.2cm;

[0024] (2) Radio frequency heating treatment of asparagus strips: The tray was placed in a 6kW, 27.12MHz free-oscillating parallel plate radio frequency heating system (Strayfield International Ltd., workingham, UK), the distance between the plates: 10cm, and the radio frequency equipment was used for rapid heating for 3min After that, take it out and put it in the refrigerator to quickly cool to about 4 °C, and then heat the asparagus strips;

[0025] (3) Th...

Embodiment 2

[0029] A preparation method of asparagus strips, comprising:

[0030] (1) Arranging asparagus strips: Select fresh asparagus with a diameter of 12mm, rinse with running water, cut asparagus strips into 3cm strips, drain the water, and get asparagus strips for use; place the asparagus strips in the same direction as the head and tail. In the sample tray made of polypropylene, the sample tray is 400mm long, 270mm wide and 20mm high, and the distance between the top and bottom and left and right of the asparagus strips is 1cm;

[0031] (2) RF heating treatment of asparagus strips: The tray was placed in a 6kW, 27.12MHz free-oscillating parallel-plate RF heating system (Strayfield International Ltd., workingham, UK), the distance between the plates: 9cm, and rapid heating for 2min using RF equipment After that, take it out and put it in the refrigerator to quickly cool to about 4 °C, and then heat the asparagus strips;

[0032] (3) The first heat pump drying treatment of asparagu...

Embodiment 3

[0036] A preparation method of asparagus strips, comprising:

[0037] (1) Arranging asparagus strips: Select fresh asparagus with a diameter of 16mm, rinse them with running water, cut them into 5cm strips, drain the water, and get asparagus strips for use; place the asparagus strips in the same direction as the head and tail. In the sample tray made of polypropylene, the sample tray is 400mm long, 270mm wide and 20mm high, and the distance between the top and bottom and left and right of the asparagus strips is 1.5cm;

[0038](2) Radio frequency heating treatment of asparagus strips: The tray was placed in a 6kW, 27.12MHz free-oscillating parallel plate radio frequency heating system (Strayfield International Co., Ltd., workingham, UK), the distance between the plates: 12cm, and the radio frequency equipment was used for rapid heating for 4min After that, take it out and put it in the refrigerator to quickly cool to about 4 °C, and then heat the asparagus strips;

[0039] (3...