Fruit and vegetable juice processing method by radio frequency coupling high-voltage pulse electric field processing

A high-voltage pulsed electric field and processing method technology, applied in the fields of food electrical treatment, food heat treatment, food science, etc., can solve the problems of high environmental protection pressure, water and energy consumption, etc. The effect of reducing flavor loss and quality degradation

Active Publication Date: 2017-09-22
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process consumes water and energy, and th

Method used

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  • Fruit and vegetable juice processing method by radio frequency coupling high-voltage pulse electric field processing
  • Fruit and vegetable juice processing method by radio frequency coupling high-voltage pulse electric field processing
  • Fruit and vegetable juice processing method by radio frequency coupling high-voltage pulse electric field processing

Examples

Experimental program
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Example Embodiment

[0020] (1) Preparation of polyphenol oxidase crude enzyme solution: a 100g apple sample was quickly removed from the stem and nucleus, then cut into small pieces, and poured into a tissue masher together with about 400ml of acetone pre-cooled to -18℃ ( 20000rpm, 1min), and then quickly filter with suction to retain the precipitated part on the filter paper, and blow off the residual acetone in the thin layer of precipitation with cold air until the precipitate has no acetone smell. The obtained acetone powder was transferred to 100 mL of 0.05 mol / L phosphate buffer (pH 6.5) and stirred for 30 min, then centrifuged (4° C., 10000 r / min, 20 min), and the supernatant obtained by centrifugation was a crude polyphenol oxidase enzyme solution.

[0021] (2) Determination of the activity of polyphenol oxidase: add 0.5mL crude enzyme solution and 2.5mL 0.2mol / L catechol solution (pH 6.5) into the cuvette and quickly shake it and put it into the spectrophotometer. The change in absorbance o...

Example Embodiment

[0023] Example 1

[0024] The radio frequency device with the publication number CN104782758A is used to process apple tissue; among them, the radio frequency device includes a conveying device and a radio frequency device with an upper plate and a lower plate. The upper plate is located above the conveying device and the material conveyed by the conveying device is on the upper The electrode plate and the lower electrode plate move between the upper electrode plate and the lower electrode plate, and high-frequency current flows through the upper electrode plate and the lower electrode plate. Therefore, after the upper electrode plate and the lower electrode plate pass high-frequency current, there is a radio frequency between the two, and the conveying device moves the animal material between the upper electrode plate and the lower electrode plate.

[0025] Specific steps are as follows:

[0026] (1) Pretreatment: Choose fresh red Fuji apples, wash them with water, peel them, and s...

Example Embodiment

[0037] Example 2

[0038] The application of radio frequency heating treatment device (invention patent application with publication number CN104782758A) is used to process apple tissue, the specific steps are as follows:

[0039] (1) Pretreatment: Choose fresh red Fuji apples, wash them with water, peel them, and slice them. The slice thickness is 10mm.

[0040] (2) Radio frequency processing: Place the cut apple slices on the conveyor belt in the center of the lower electrode plate of the radio frequency processing chamber. The operating frequency of the radio frequency processing device is 27.12MHz, the power is set to 3.5kW, and different electrode plate spacing is set, and the sample thickness is 10mm, set different processing time, control the auxiliary temperature in the radio frequency processing chamber to 55℃, the auxiliary temperature is provided by hot air ≥55℃, and an external hot air generator can be used to collect ambient air and pass it through a 5.6kW electric heate...

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Abstract

The invention discloses a fruit and vegetable juice processing method by radio frequency coupling high-voltage pulse electric field processing, and belongs to the field of farm product processing. According to the method, in an apple juice production process, apple tissues are subjected to radio frequency enzyme inactivation processing; for the radio frequency processing, a radio frequency continuous processing device disclosed in the patent application of CN104782758A and OSU-4L type high-voltage pulse electric field continuous processing equipment in a laboratory scale are used for radio frequency processing; apple slices are fast cooled after being processed in a radio frequency processing cavity, and are extruded into juice; then, the apple juice is processed by a high-voltage pulse electric field. The processing method has the advantages that 70 to 80 percent of activity of polyphenol oxidase can be passivated; the enzyme inactivation effect is good; the apple juice browning can be better prevented; meanwhile, the flavor loss of the apple juice can be reduced; the nutrition and the quality of apples is ensured.

Description

technical field [0001] The invention relates to a method for processing fruit and vegetable juice by radio frequency coupling high-voltage pulse electric field treatment, belonging to the field of agricultural product processing. Background technique [0002] In recent years, due to the enhancement of consumers' health and nutrition awareness, the consumption of fruit and vegetable juice in my country has continued to grow. In the process of fruit and vegetable juice processing, inactivating enzymes is an important and indispensable unit operation of fruit and vegetable juice processing. Fruit and vegetable juice needs to inactivate endogenous enzymes such as polyphenol oxidase and peroxidase first to protect color and flavor. Traditional fruit and vegetable juice processing usually blanches in advance to inactivate enzymes to protect color or quickly deactivates fruits and vegetables after juicing. The process consumes water and energy, and the pressure on environmental pr...

Claims

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Application Information

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IPC IPC(8): A23L2/04A23L2/50
CPCA23L2/04A23L2/50A23V2002/00A23V2300/12A23V2300/24
Inventor 赵伟田一雄杨瑞金颜文旭
Owner JIANGNAN UNIV
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