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Fresh keeping method for longan

A fresh-keeping method and longan technology are applied in the directions of fruit and vegetable fresh-keeping, food preservation, and protection of fruits/vegetables with a coating protective layer, which can solve the problems of short fresh-keeping time, easy decline of antibacterial ability of sodium alginate, and non-persistent antibacterial, etc. Achieve the effect of prolonging fresh-keeping time, significant antibacterial and insecticidal effect, and improving antibacterial ability

Inactive Publication Date: 2017-12-22
平南县正达农业发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sodium alginate has film-forming, moisturizing, adhesive and antibacterial properties, and is safe and non-toxic. It is a commonly used film coating agent in fruit and vegetable preservation, but the antibacterial ability of sodium alginate is easy to decline, antibacterial is not durable, and the preservation time is short. , needs further improvement

Method used

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  • Fresh keeping method for longan
  • Fresh keeping method for longan

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Experimental program
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Effect test

Embodiment 1

[0023] A kind of fresh-keeping method of longan of the present embodiment, comprises the following steps:

[0024] (1) screening: select 8-9 mature longans to harvest, remove damaged fruit and diseased fruit after harvest, and obtain longan to be preserved;

[0025] (2) Disinfection: putting the above-mentioned longan to be preserved into the ozone water with a concentration of 0.001% and soaking it for 1min, pulling it out, and air-drying the surface moisture;

[0026] (3) coating film: the above-mentioned sterilized longan is put into the composite coating film preservative and soaked, so that the fruit surface is covered with a transparent film, and naturally air-dried; the preparation method of the composite coating film preservative is: A. Add an equal amount of absolute ethanol and methoxybenzaldehyde to sodium alginate with a volume fraction of 2% and mix well, then add tartaric acid 2 times the weight of the sodium alginate to react together for 8 hours, the reaction t...

Embodiment 2

[0029] A kind of fresh-keeping method of longan of the present embodiment, comprises the following steps:

[0030] (1) screening: select 8-9 mature longans to harvest, remove damaged fruit and diseased fruit after harvest, and obtain longan to be preserved;

[0031] (2) Disinfection: put the above-mentioned longan to be kept fresh into the ozone water with a concentration of 0.004% and soak for 2min, pull out, and air-dry the surface moisture;

[0032] (3) coating film: the above-mentioned sterilized longan is put into the composite coating film preservative and soaked, so that the fruit surface is covered with a transparent film, and naturally air-dried; the preparation method of the composite coating film preservative is: A. Add an equal amount of absolute ethanol and methoxybenzaldehyde to sodium alginate with a volume fraction of 4% and mix well, then add citric acid 3 times the weight of the sodium alginate to react together for 10 hours, and the reaction temperature is 5...

Embodiment 3

[0035] A kind of fresh-keeping method of longan of the present embodiment, comprises the following steps:

[0036] (1) screening: select 8-9 mature longans to harvest, remove damaged fruit and diseased fruit after harvest, and obtain longan to be preserved;

[0037] (2) Disinfection: put the above-mentioned longan to be preserved into the ozone water with a concentration of 0.002% and soak for 1.5min, pull it out, and air-dry the surface moisture;

[0038](3) coating film: the above-mentioned sterilized longan is put into the composite coating film preservative and soaked, so that the fruit surface is covered with a transparent film, and naturally air-dried; the preparation method of the composite coating film preservative is: A. Add an equal amount of absolute ethanol and methoxybenzaldehyde to sodium alginate with a volume fraction of 3% and mix well, then add tartaric acid 2.5 times the weight of the sodium alginate and react together for 9 hours, the reaction temperature i...

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Abstract

The invention discloses a fresh keeping method for longan and relates to the technical field of fresh keeping of agricultural products. The method includes the steps of screening, disinfection, film coating, packaging and storage. In the method, sodium alginate is modified to improve antibacterial capability and sustained release performance thereof; after the longan is picked, the surface of the fruit is sterilized and then is coated with a film by means of the modified sodium alginate; finally the longan is stored under low-temperature regulation and control. By combination of the mentioned methods, fresh keeping time of longan is prolonged and quality of the longan is maintained.

Description

【Technical field】 [0001] The invention relates to the technical field of fresh-keeping of agricultural products, in particular to a method for keeping fresh of longan. 【Background technique】 [0002] Longan, also known as longan, is a famous and precious specialty in the south subtropical zone of my country. Its fruit is rich in nutrition and has been loved by people since ancient times, and it is even regarded as a precious tonic. Longan is native to subtropical regions and matures in hot and humid seasons. The fruit has high water content and sugar content, strong respiration, and is susceptible to various pathogenic bacteria. Under normal temperature conditions, 3-4 days after harvest, it will brown, become sour, and deteriorate. It is one of the fruits that are difficult to store and keep fresh. Using longan storage and fresh-keeping technology for fresh-keeping can relieve the pressure of fresh fruit sales, prolong the supply period and improve economic benefits. [0...

Claims

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Application Information

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IPC IPC(8): A23B7/16A23B7/157A23B7/154A23B7/04
CPCA23B7/04A23B7/154A23B7/157A23B7/16
Inventor 李达耀
Owner 平南县正达农业发展有限公司
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