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Method for removing walnut seed coats

A technology of walnut kernels and lye, applied in the fields of shelling, pod removal, food science, etc., can solve the problems of hard to remove seed coat, time-consuming, etc., achieve the effect of retaining content, reducing the amount of alkali, and reducing damage

Active Publication Date: 2019-01-11
GUIYANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method generally uses a single hot alkali solution to remove the seed coat, which is time-consuming.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) Freeze fresh walnut kernels at -18°C for 2 hours, and then spray them with steam at 60°C for 15 minutes;

[0017] 2) Immerse the sprayed walnut kernels in the lye at 60°C in a weight ratio of 1:2, and keep it warm for 20 minutes; among them:

[0018] The lye is composed of a concentration of 2% composite phosphate solution, a concentration of 0.5% Na 2 CO 3 Solution, the concentration is that the NaOH solution of 1% is formulated by the volume ratio of 1:1:1, and described composite phosphate is made of NaOH solution 3 PO 4 12H 2 O, Na 2 HPO 4 12H 2 O, Na 4 P 2 o 7 10H 2 O is mixed in a weight ratio of 7.5:1.5:1;

[0019] 3) Rinse the soaked walnut kernels with water with a certain pressure until neutral;

[0020] 4) Dry the washed walnuts in an oven at 50°C.

Embodiment 2

[0022] The steps are the same as in Example 1, wherein: the freezing time in step 1) is 3h, the steam temperature is 50°C, and the steam spraying time is 20min; the temperature of the lye in step 2) is 50°C, and the soaking time is 30min; 4) The drying temperature in the oven is 40°C.

Embodiment 3

[0024] The steps are the same as in Example 1, wherein: the freezing time in step 1) is 2.5 hours, the steam temperature is 55°C, and the steam spraying time is 18 minutes; the temperature of the lye in step 2) is 55°C, and the soaking time is 25 minutes; Step 4) The drying temperature in the medium is 45°C.

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PUM

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Abstract

The invention discloses a method for removing walnut seed coat, belongs to a nut processing method; and aims to provide a method for quickly and effectively removing the walnut seed coats. The methodcomprises the following steps: carrying out lye soaking by freezing the fresh walnut seeds for 2-3 h, then spraying the walnut seeds with steam for 15-20 min, immersing the sprayed walnut kernel intohot lye prepared from compound phosphate, Na2CO3, and NaOH, and conducting soaking for 20-30 minutes; and rinsing the soaked walnut seeds with water with certain pressure to a neutral state, and thendrying the walnut seeds. By the method of the invention, the seed coat removal rate can reach 98% or above, protein content of the processed walnut seeds can reach 15.938%, and the loss is not high; the method can quickly remove the walnut seed coats.

Description

technical field [0001] The invention relates to a method for processing nuts, in particular to a method for removing seed coats of walnut kernels. Background technique [0002] As we all know, there is a brown seed coat containing tannin, cellulose, pectin, pigment and other substances attached to the surface of walnut kernel. Tannins in the seed coat not only give walnuts a bitter taste and lead to browning of walnut beverages, but also form precipitation complexes when combined with proteins, thereby reducing product quality; in addition, in the production process of walnut oil, tannins Substances often affect the taste and color of oils. Therefore walnut kernel seed coat generally will be removed when carrying out deep processing to walnut. [0003] At present, the methods for removing walnut seed coat mainly include baking method, freezing method, and hot alkali soaking method. The roasting method is to heat the walnut kernel at high temperature, knead the walnut kern...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23N5/00
CPCA23N5/002
Inventor 裴璞花马立志安传相谢丹岑顺友刘晓燕何劲王金华毕远林宋明发
Owner GUIYANG UNIV
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