CN1180699C - Production process of dewatered litchi pulp - Google Patents

Production process of dewatered litchi pulp Download PDF

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Publication number
CN1180699C
CN1180699C CNB021348707A CN02134870A CN1180699C CN 1180699 C CN1180699 C CN 1180699C CN B021348707 A CNB021348707 A CN B021348707A CN 02134870 A CN02134870 A CN 02134870A CN 1180699 C CN1180699 C CN 1180699C
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CN
China
Prior art keywords
pulp
quick
precooling
frozen
litchi pulp
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Application number
CNB021348707A
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Chinese (zh)
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CN1403004A (en
Inventor
李远志
薛子光
翟国华
罗树灿
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华南农业大学
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Priority to CNB021348707A priority Critical patent/CN1180699C/en
Publication of CN1403004A publication Critical patent/CN1403004A/en
Application granted granted Critical
Publication of CN1180699C publication Critical patent/CN1180699C/en

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Abstract

The present invention relates to a method for processing dewatered litchi pulp, which comprises the following processes: raw material selection, wash, disinfection, shelling, core removing, color protection, precooling, quick freezing, vacuum freeze drying and packing. The present invention is characterized in that litchi pulp is soaked in a color protection solution for color protection processing; the quick freezing processing is carried out before the litchi pulp is dried, the color of products is maintained, and the recovery of the products is enhanced. Material water content is reduced below 3 % by vacuum freeze drying, and finished products can be obtained. The method can efficiency maintain the original color, perfume, taste and shape of litchi pulp and prevent largely damaging nutrient substances. The recovery performance of the products is good.

Description

The processing method of dewatered litchi pulp

Technical field

The present invention relates to foods processing technique, particularly relates to the deep process technology of litchi pulp.

Background technology

The processing mode of traditional dehydration lichee (lichee is done) is to utilize " Exposure to Sunlight " or " heated-air drying ", fresh litchi is connected the shell band examine drying and dehydrating processing together.The shortcoming that the mode of this processing exists is the long-time action of high temperature of material warp, and pulp shrinks, and the color and luster blackening is brown, and nutritive value reduces greatly, and owing to be with shell, nuclear, eats inconvenient.

Summary of the invention

Purpose of the present invention: the processing method that a kind of new dewatered litchi pulp is provided, overcome the shortcoming that traditional lichee is done, helped keeping the original color of litchi pulp, shape, prevented the considerable damage of nutrient, good quality of product meets national related food sanitary standard.

The method of processing dewatered litchi pulp provided by the invention, comprise the fresh lichee raw material the stoning of selecting, clean, sterilize, shell, protect look, precooling, quick-frozen, vacuum freeze drying, packaging process.It is characterized in that placing 0.2%~1.0% edible-type citric acid and 0.02~0.2% ascorbic acid mixed solution to soak 15~30 minutes the litchi pulp of shelling stoning, protecting look handles, to suppress the polyphenol oxidase activity in the litchi pulp, make product in process, keep original color and luster.It is 4 ℃-5 ℃ precooling room precooling that pulp after protecting look and handling is put into temperature, and the pulp after the precooling should in time carry out quick-frozen to be handled.Used air themperature is-23 ℃~-45 ℃ in the quick freezing unit, and compulsory air velocity is 10~15 meter per seconds, and the quick-frozen time is 2~4 hours.The pulp that quick-frozen is good places vacuum freeze, vacuum remains on 30~100Pa, condenser temperature is lower than-35 ℃, heating and temperature control is at 50 ℃~100 ℃, 8~14 hours time was reduced to below 3% material moisture, then packing, be product, product should meet enterprise-quality standard and national food hygienic standard.

Protect look and handle and can carry out in Stainless steel basin or fermentation vat, quick-frozen is handled and is carried out in the blowing-type quick-freezing plant, and vacuum freeze drying is carried out in vacuum freeze.

The present invention adopts and protects look, quick-frozen, Vacuum Freezing ﹠ Drying Technology processing dewatered litchi pulp product, has following advantage:

(1) product is handled through protecting look and low-temperature vacuum drying, and color and luster, local flavor remain unchanged substantially, and nutrient loss is few, and the Vit C contents of product exceeds about 15 times than traditional lichee is dried.(2) through quick-frozen and vacuum drying treatment, dewatered litchi pulp can keep original fruit shape substantially, and rehydration is functional.

The specific embodiment

Embodiment:

Select the fresh lichee of no bad change, no disease and pest for use, putting into 0.02% javelle water after the cleaning disinfects, after the shelling stoning, pulp promptly places the mixed solution of the ascorbic acid of 0.6% edible-type citric acid and 0.2% to soak 20 minutes, protect look and handle, put into temperature then and be 4 ℃~5 ℃ precooling room and store.After 30 minutes, the pulp of precooling is put into quick freezing unit and carry out the quick-frozen processing.The air themperature of quick-frozen is-35 ℃, and air velocity is 15 meter per seconds, and the quick-frozen time is 3 hours.The pulp good quick-frozen places vacuum freeze, and vacuum remains on 60Pa, and condenser temperature is-45 ℃, and heating and temperature control is at 60 ℃~80 ℃, and the time is about 8 hours, and material moisture is reduced to below 3%, and packing is product then.

Claims (1)

1, a kind of processing method of dewatered litchi pulp, comprise selecting of fresh lichee raw material, clean, sterilization, the shelling stoning, protect look, precooling, quick-frozen, vacuum freeze drying, packaging process, it is characterized in that litchi pulp with the shelling stoning places the ascorbic acid mixed solution of 0.2%~1.0% edible-type citric acid and 0.02%~0.2% to soak to protect look in 15~30 minutes handles, to suppress the polyphenol oxidase activity in the litchi pulp, it is 4 ℃-5 ℃ precooling room precooling that pulp after handling is put into temperature, after the precooling 30 minutes, pulp after the precooling is carried out quick-frozen to be handled, used air themperature is-23 ℃~-45 ℃ in the quick freezing unit, compulsory air velocity is 10~15 meter per seconds, the quick-frozen time is 2~4 hours, the pulp that quick-frozen is good places vacuum freeze, vacuum remains on 30Pa~100Pa, condenser temperature is lower than-35 ℃, heating and temperature control is at 50 ℃~100 ℃, 8~14 hours time, material moisture is reduced to below 3%, packing is product then.
CNB021348707A 2002-09-30 2002-09-30 Production process of dewatered litchi pulp CN1180699C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB021348707A CN1180699C (en) 2002-09-30 2002-09-30 Production process of dewatered litchi pulp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB021348707A CN1180699C (en) 2002-09-30 2002-09-30 Production process of dewatered litchi pulp

Publications (2)

Publication Number Publication Date
CN1403004A CN1403004A (en) 2003-03-19
CN1180699C true CN1180699C (en) 2004-12-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CNB021348707A CN1180699C (en) 2002-09-30 2002-09-30 Production process of dewatered litchi pulp

Country Status (1)

Country Link
CN (1) CN1180699C (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1294819C (en) * 2004-10-09 2007-01-17 宋述孝 Dehydrating and freshness preserving method for lichee and longan and product produced by said method
CN100357686C (en) * 2004-12-30 2007-12-26 周强 Freeze drying and processing method for gastrodia tuber
IL172001A (en) * 2005-11-16 2012-10-31 Fresh Defrost Ltd Method for preserving pomegranate arils and other small seedless and seed-bearing fruit juice bearing vesicles
CN101129146B (en) * 2007-09-18 2011-02-16 华南农业大学 Method for processing dewatered fruits and vegetables
CN102119712B (en) * 2010-03-28 2012-11-07 惠州市四季鲜绿色食品有限公司 Preparation method of semi-dry litchis or longans capable of keeping flavor, color and luster of fresh fruit
CN101919438A (en) * 2010-09-26 2010-12-22 福建农林大学 Arillus longan microwave vacuum drying process
CN102613283B (en) * 2011-01-26 2014-01-22 深圳职业技术学院 Fruit vacuum freeze drying method
CN104336164A (en) * 2013-08-02 2015-02-11 梁活 Method for drying litchis
CN103907831B (en) * 2014-04-22 2015-11-25 宁波江东唐通机电设备有限公司 The preparation method of mulberry fruit rice crust
CN104970311A (en) * 2015-06-11 2015-10-14 钟兴欢 Processing method of dried litchi chinensis
CN105361026A (en) * 2015-11-13 2016-03-02 陈启芬 Preparation method of lichee powder
CN106359545A (en) * 2016-08-26 2017-02-01 广西慧投互联网金融服务有限公司 Production technology of dehydrated litchi flesh
CN107114720A (en) * 2017-04-01 2017-09-01 福建立兴食品有限公司 A kind of preparation method of vacuum freeze drying longan center-filled product

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