Method for drying pumpkin pulp through combination of ultrasound, freezing and far infrared rays

A technology of far-infrared drying and pumpkin pulp, which is applied in food drying, food ultrasonic treatment, fruit and vegetable preservation, etc. Effect

Inactive Publication Date: 2021-10-08
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current research on ultrasonic technology in the field of drying is mainly limited to how to improve the drying efficiency of a single drying method, and there is still a lack of research on the application of ultrasonic pretreatment combined with combined drying to improve the nutritional quality of dried products

Method used

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  • Method for drying pumpkin pulp through combination of ultrasound, freezing and far infrared rays
  • Method for drying pumpkin pulp through combination of ultrasound, freezing and far infrared rays
  • Method for drying pumpkin pulp through combination of ultrasound, freezing and far infrared rays

Examples

Experimental program
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Effect test

Embodiment 1

[0040] A method for ultrasonically combined vacuum freezing-far-infrared combined drying of pumpkin pulp for seeds, comprising the following steps:

[0041] (1) Wash the mature, fresh and undamaged seeds with pumpkin, peel and remove the seeds, weigh 200±0.5g of pulp and cut into strips of about 3.5cm×0.8cm×0.3cm;

[0042] (2) Ultrasonic pretreatment: put pumpkin pulp for seeds in step (1) in a beaker filled with 1000 mL of deionized water, immerse an ultrasonic probe with a diameter of 15 mm in distilled water for 15 mm, ultrasonic power 240W, ultrasonic frequency 20KHz, work The temperature is 30°C, and the working time is 30 minutes; after ultrasonic pretreatment, dry the surface moisture of pumpkin pulp for seeds with a paper towel, and place it in a freeze-drying bottle.

[0043] (3) Pre-freezing: place the freeze-dried bottle containing pumpkin pulp for seeds in step (2) in a -30°C refrigerator for 30 hours;

[0044] (4) Vacuum freeze-drying: put the pumpkin pulp for se...

Embodiment 2

[0049] A method for vacuum-far-infrared segmented drying of pumpkin pulp for seeds combined with ultrasound, comprising the following steps:

[0050] (1) is identical with the step (1) in embodiment 1;

[0051] (2) same as step (2) in embodiment 1;

[0052] (3) same as step (3) in embodiment 1;

[0053] (4) The difference from step (4) in Example 1 is that the vacuum freeze-drying until the water content conversion point is 40%. Close the freeze-vacuum dryer, take out the pumpkin pulp for seeds, and put it into a far-infrared drying device to continue drying;

[0054] (5) same as step (5) in embodiment 1;

[0055] (6) is the same as step (6) in Example 1.

[0056] The invention improves the freeze-drying efficiency of pumpkin for seeds. Compared with freeze-drying alone, the total drying time is shortened by 51.75% by using ultrasonic pretreatment combined with vacuum freezing-far-infrared segmental drying. Compared with separate far-infrared drying, the product The appea...

Embodiment 3

[0058] A method for vacuum-far-infrared segmented drying of pumpkin pulp for seeds combined with ultrasound, comprising the following steps:

[0059] (1) is identical with the step (1) in embodiment 1;

[0060] (2) same as step (2) in embodiment 1;

[0061] (3) same as step (3) in embodiment 1;

[0062] (4) same as step (4) in embodiment 1;

[0063] (5) The difference from step (5) in Example 1 is that the temperature of the far-infrared drying device is set to 80°C. When the temperature in the drying box reaches 80°C and is basically constant, use pumpkin pulp for the seeds in step (4). Put it into it and dry until the moisture content drops to 7% of the final safe moisture content, then stop drying;

[0064] (6) is the same as step (6) in Example 1.

[0065] The invention improves the freeze-drying efficiency of pumpkin for seeds. Compared with freeze-drying alone, the total drying time is shortened by 33.5% by using ultrasonic pretreatment combined with vacuum freezing-...

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Abstract

The invention discloses a method for drying pumpkin pulp through combination of ultrasound, freezing and far infrared rays, and belongs to the technical field of deep processing of fruits and vegetables. The method comprises the following steps of: firstly, pretreating pumpkin pulp by adopting ultrasound, and then performing vacuum freeze drying and far infrared drying on the pretreated pumpkin pulp to obtain the dried pumpkin pulp. According to the invention, ultrasonic pretreatment is combined with vacuum freezing and far infrared sectional type combined drying; the seed pumpkin drying time is effectively shortened; the drying rate is increased; the dried seed pumpkin pulp finished product keeps good appearance; and compared with a single drying mode, the phenol content and the carotenoid content are greatly increased.

Description

technical field [0001] The invention relates to a method for drying pumpkin pulp combined with ultrasound, freezing and far infrared, and belongs to the technical field of deep processing of fruits and vegetables. Background technique [0002] Pumpkin for seeds is a general term for cultivars of edible seeds in Cucurbitaceae Cucurbita, mainly including three cultivars of Indian squash, American squash and Chinese squash. At present, pumpkins for seeds are mainly planted in Xinjiang, Heilongjiang, Inner Mongolia, Gansu and other places in my country, and the planting area has exceeded 300,000 hectares. In recent years, pumpkin seeds have attracted much attention due to their nutritional and health value such as anti-oxidation, anti-inflammation, hypoglycemic, and hypolipidemic. The annual output of pumpkin seeds in China exceeds 150,000 tons, accounting for about 70% of the world's export volume. However, due to the large-scale production and global consumption of pumpkin f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23L19/00A23L5/00A23L5/30A23B7/024A23B7/02
CPCA23L19/01A23L19/03A23L5/00A23L5/32A23B7/024A23B7/02A23V2002/00A23V2300/10A23V2300/24A23V2300/48
Inventor 范柳萍绰尔鹏李进伟
Owner JIANGNAN UNIV
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