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Processing method of quick-frozen lotus seeds

A processing method and a technology for quick-freezing lotus seeds, which are applied in the directions of preservation of fruits/vegetables by freezing/refrigeration, preservation of fruits/vegetables by radiation/electrical treatment, protection of fruits/vegetables with a coating protective layer, etc., and can solve the damage of lotus seed cells and protoplasm. , The quality of quick-frozen lotus seeds is reduced, and nutrients are taken away, so as to reduce the loss of nutrients, improve the loss of water, and prolong the preservation period.

Pending Publication Date: 2018-05-18
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above three methods and other fresh-keeping storage techniques delay the browning of fresh lotus to a certain extent through methods such as color protection, smearing, and quick-freezing of lotus seeds, and prolong the fresh-keeping period of fresh lotus. However, IQF monomer quick-freezing and ordinary quick-freezing freeze The speed is slow, causing damage to the lotus seed cells and protoplasm, and the polyphenol oxidase in the cells escapes after freezing and thawing to cause browning, and the loss of thawed juice will take away some nutrients; at the same time, during the circulation process of quick-frozen lotus seeds, The browning problem caused by repeated freezing and thawing of quick-frozen lotus seeds due to many reasons such as shopping malls or consumer buying habits has not been effectively solved, making the quality of quick-frozen lotus seeds decline in the circulation process

Method used

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  • Processing method of quick-frozen lotus seeds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Materials and Methods

[0037] 1. Materials

[0038] Fresh lotus seeds, zein powder, ethanol, oleic acid, glycerides, ascorbic acid, propyl gallate, citric acid, calcium chloride, guaiacol, hydrogen peroxide, catechol;

[0039] 2. Main instruments

[0040] DHH1-GYB homogenizer Xihuayi (Beijing) Technology Co., Ltd.

[0041] KQ5200DE CNC Ultrasonic Cleaner Kunshan Ultrasonic Instrument Co., Ltd.

[0042] SD-X-1200 Tunnel Liquid Nitrogen Quick Freezer Kewei Jiani (Beijing) Technology Co., Ltd.

[0043] ZDQ400 / 2 single chamber vacuum machine Wenzhou Xinda Packaging Machinery Factory

[0044] BC / BD-272SE Haier Freezer

[0045] 3. Test method

[0046] A processing method for quick-frozen lotus seeds, comprising the following steps:

[0047] Step 1: Select fresh lotus seeds with full grains and no pests and diseases, and perform shelling, film removal, core treatment and cleaning;

[0048] Add an ethanol solution with a volume concentration of 80% to the zein powder (th...

Embodiment 2

[0068] Others are the same as Example 1, and the difference is that the test method is as follows:

[0069] A processing method for quick-frozen lotus seeds, comprising the following steps:

[0070] Step 1: Select fresh lotus seeds with full grains and no pests and diseases, and perform shelling, film removal, core treatment and cleaning;

[0071] Add an ethanol solution with a volume concentration of 80% to the zein powder (the ratio of solid to liquid of the zein powder to the ethanol solution is 1:10, unit g / mL), and then place it in a water bath at 60°C. Heating while stirring for 20min, then centrifugal 20min under the rotating speed of 4000r / min, get supernatant, add oleic acid (addition is 40wt% of zein powder consumption) in supernatant, glyceride (addition is zein powder consumption) 60wt% of the amount of prolamin powder) and ascorbic acid (the addition amount is 0.20wt% of the compound liquid) are homogeneously mixed to obtain the compound liquid (for actual use, a...

Embodiment 3

[0077] Others are the same as Example 1, and the difference is that the test method is as follows:

[0078] A processing method for quick-frozen lotus seeds, comprising the following steps:

[0079] Step 1: Select fresh lotus seeds with full grains and no pests and diseases, and perform shelling, film removal, core treatment and cleaning;

[0080] Add an ethanol solution with a volume concentration of 80% to the zein powder (the solid-liquid ratio of the zein powder to the ethanol solution is 1:12, unit g / mL), and then place it in a water bath at 65°C. Heating while stirring for 18min, then centrifuging for 20min at a rotating speed of 4000r / min, getting the supernatant, adding oleic acid (addition is 45wt% of zein powder consumption), glyceride (addition is zein powder) in the supernatant 65wt% of the amount of prolamin powder) and ascorbic acid (the addition amount is 0.25wt% of the compound liquid) are homogeneously mixed to obtain the compound liquid (for actual use, acco...

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Abstract

The present invention relates to a processing method of quick-frozen lotus seeds. The processing method comprises the following steps: full-particle and disease-and-insect-damage-free fresh lotus seeds are selected, and the selected lotus seeds are pretreated; an ethanol solution at a volume concentration of 80% is added into zein powder, stirring is conducted while heating is conducted, then thematerial is centrifuged to obtain supernatant, oleic acid, glycerol ester and ascorbic acid are added into the supernatant, the materials are mixed to obtain compound liquid, and the compound liquid is cold-stored to a liquid temperature of 8-12 DEG C; the pretreated lotus seeds are soaked in a color protection solution to be subjected to an ultrasonic treatment for 5-7 min; the color-protected lotus seeds are soaked in the cold-stored compound liquid in the step 1 to be subjected to membrane coating for 2 min; and the membrane-coated lotus seeds are quick-frozen using a liquid-nitrogen quick-freezing method, then the quick-frozen lotus seeds are vacuum-packed, and then the vacuum-packed lotus seeds are put at -15 to -20 DEG C to be cold-stored to obtain a desired product. The processing method of the quick-frozen lotus seeds can effectively prevent browning of the quick-frozen lotus seeds during circulation processes to prolong a fresh-keeping period of the quick-frozen lotus seeds.

Description

technical field [0001] The invention relates to the technical field of food processing, in particular to a processing method for quick-frozen lotus seeds. Background technique [0002] Lotus seeds (also known as Shuizhidan, lotus seeds, and lotus seeds) are the fruits or seeds of lotus, a plant of the genus Lily in the family Nymphaeaceae. Since ancient times, lotus seeds, as a high-grade nourishing food, have been widely eaten among the people. The dual-purpose properties of high nutritional value and strong health effects make them popular among consumers in domestic and foreign markets. [0003] The activity of polyphenol oxidase in fresh lotus seeds is high, the storage period is very short, and it is easy to brown. As an improvement, the journal paper "Studies on the Inhibition of Polyphenol Oxidase Activity in the Processing and Storage of Quick-frozen Jianlian" used color protection solution to soak for 20 minutes to inhibit browning; the Chinese patent application n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23B7/16A23B7/04A23B7/015
CPCA23B7/015A23B7/04A23B7/16
Inventor 郭泽镔赵蓓蓓郑宝东林鸿林雄孙思薇
Owner FUJIAN AGRI & FORESTRY UNIV
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