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Pretreatment method of walnut kernels

A walnut kernel and pretreatment technology, applied in the field of food processing, can solve problems such as high cost, protein denaturation, and environmental pollution

Active Publication Date: 2021-07-30
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, lye immersion, salt solution immersion and freeze-thaw methods are often used for peeling to reduce or remove the impact of polyphenols in the walnut seed coat on the product. Although the above methods can quickly remove the walnut seed coat, there are Pollution of the environment, high cost and even protein denaturation affect the subsequent utilization of proteins and other issues

Method used

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  • Pretreatment method of walnut kernels
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  • Pretreatment method of walnut kernels

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Embodiment 1: A kind of method of walnut kernel dephenolization

[0057] Prepare 70% ethanol solution, adjust the solution hydrochloric acid concentration to be 0.05mol / L, weigh 100g of commercially available Yunnan walnut kernels and complete walnut kernels, according to the ratio of the quality of walnut kernels in g to the volume of ethanol aqueous solution in mL of 1:20 Proportional mixing, put the mixed system in an ultrasonic cleaning machine, fix the ultrasonic temperature at 60°C, and the power at 200w, first use 40kHz ultrasonic treatment for 30 minutes, then 28kHz ultrasonic treatment for 30 minutes, then filter, recover dephenolized walnut kernels and dry them in an oven at 60°C Finally, moisture is removed (moisture content is less than 3%) to obtain dephenolized walnut kernels with a dephenolization rate of 97.5%.

Embodiment 2

[0058] Embodiment 2: a kind of method of walnut kernel dephenolization

[0059] Prepare 70% ethanol solution, adjust the solution hydrochloric acid concentration to be 0.05mol / L, take by weighing 200g of complete walnut kernels from Yunnan walnut kernels commercially available, according to the quality of walnut kernels in g and the volume ratio of ethanol aqueous solution in mL 1:20 Proportionally mixed, the mixed system is placed in an ultrasonic cleaning machine, the ultrasonic temperature is fixed at 60°C, and the power is 200w. First, 28kHz ultrasonic treatment is used for 30 minutes, and then 40kHz ultrasonic treatment is used for 30 minutes, and then filtered, and the dephenolized walnut kernels are recovered and dried in an oven at 60°C. Finally, the water is removed (moisture content is less than 3%), and the dephenolized walnut kernel with a dephenolization rate of more than 97.5% is obtained.

Embodiment 3

[0060] Embodiment 3: a kind of method of walnut kernel dephenolization

[0061] Prepare 70% ethanol solution, adjust the solution hydrochloric acid concentration to be 0.05mol / L, take 500g of commercially available Yunnan walnut kernels and complete walnut kernels, according to the quality of walnut kernels in g and the volume ratio of ethanol aqueous solution in mL 1:20 Proportionally mixed, put the mixed system in an ultrasonic cleaning machine, fix the ultrasonic temperature at 60°C, and the power at 190w, use 40kHz ultrasonic treatment for 30 minutes and then 28kHz ultrasonic treatment for 30 minutes, then filter, recover the dephenolized walnut kernels and dry them in an oven at 60°C Water is removed (moisture content is less than 3%) to obtain dephenolized walnut kernels with a dephenolization rate of more than 97.5%.

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Abstract

The invention discloses a pretreatment method of walnut kernels, and belongs to the technical field of food processing. The method comprises the following steps: by taking walnut kernels without seed coats removed as raw materials, carrying out composite frequency ultrasonic treatment to obtain dephenolized walnut kernels; the composite frequency ultrasonic treatment refers to ultrasonic treatment under multiple sections of different frequencies, and the frequency is 20-80 kHz; the composite frequency ultrasonic treatment time is 50 to 60 minutes. The composite ultrasonic frequency dephenolization solves the problems of low oil extraction rate and poor protein function property of walnut seed coat polyphenol in a walnut aqueous enzymatic method, maximally utilizes walnut resources, and improves the additional value of walnuts.

Description

technical field [0001] The invention relates to a pretreatment method for walnut kernels, belonging to the technical field of food processing. Background technique [0002] Walnut (Juglans regia L.) is a plant of the Juglandaceae Juglans genus, which has the effects of moistening the intestines and laxative, nourishing the kidney, improving intelligence, warming the lungs and relieving asthma, solidifying essence and strengthening the waist. The fat content in the walnut kernel is about 55% to 70%, the protein content is about 14 to 24%, and there are also various trace elements such as niacin, pantothenic acid, calcium, iron, phosphorus, vitamins and polyphenols that are necessary for the human body. Rich in nutritional value, it is one of the nut foods loved by the common people. Walnut oil is a potential lipid resource, and its high content of phospholipids helps to improve intelligence and memory, and is a key component of infant vision and brain neurodevelopment. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23L25/00A23L5/30A23L5/20A23D9/007A23D9/04A21D2/26C11B1/04B01D11/02
CPCA23L25/20A23L5/32A23L5/20A23D9/007A23D9/04A21D2/266C11B1/04B01D11/0265A23V2002/00A23V2300/48
Inventor 张文斌孙敬敬杨瑞金蒋将
Owner JIANGNAN UNIV
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