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Efficient preparation technology of high-quality hickory nut oil

A technology of pecan oil and preparation process, which is applied in the direction of fat oil/fat refining, fat oil/fat production, fat production, etc., can solve the problems of high production temperature, rising pressure and energy consumption, low oil yield, etc., and achieve oil quality. Good, mild conditions, high oil yield

Inactive Publication Date: 2019-05-17
RES INST OF SUBTROPICAL FORESTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The screw pressing method has simple process and equipment, but due to the high oil content of hickory, it is easy to produce smooth bore phenomenon, and the production temperature is high, which is easy to cause the rich polyunsaturated fatty acids in hickory oil to be easily oxidized; the hydraulic method has mild conditions and high oil quality. High-grade characteristics, but the oil yield is not high, and as the oil content in hickory nuts decreases, the pressure and energy consumption rise rapidly; the organic solvent extraction method has the advantages of high oil yield, easy to realize large-scale production and production automation, but There are risks in terms of production safety and solvent residues
The water extraction method and the water enzyme method have mild treatment conditions, but there are also disadvantages such as high enzyme cost, low oil yield, and long reaction time

Method used

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  • Efficient preparation technology of high-quality hickory nut oil

Examples

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Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Take hickory kernels and dry them in a dryer at 60°C until the moisture content is about 5%. After wrapping the cakes, put them in a vertical hydraulic oil press and squeeze them for about 20 minutes. Vacuum drying for 30min dehydration, the oil is hickory cold pressed oil. After hydraulic pressure, the residual oil in the residual cake is about 25%. Add pH 3.5 deionized water according to the ratio of material to liquid 1:4 (w / v), homogenize at 2000rpm for 2min, filter with plate and frame, and centrifuge the filtrate at 3000rpm for 10 minutes. ℃ vacuum drying for 30min dehydration, the oil is hickory water extraction oil. The calculated total oil yield is about 89%. The cold-pressed hickory oil and the water-extracted oil were tested respectively, and the acid values ​​were 0.20 and 0.15 mgKOH / g, and the peroxide values ​​were 2.1 and 1.9 mmol / kg. Its quality meets the relevant requirements of "GB2716-2018 National Food Safety Standard Edible Vegetable Oil...

Embodiment 2

[0024] Example 2: Take pecan seeds and dry them in a dryer at 60°C until the moisture content is about 6%, mechanically break the shells until the shell-to-kernel ratio is about 1:9, wrap the cakes and put them in a vertical hydraulic oil press for about 30 minutes , collect the pressed oil, filter, and vacuum-dry the oil sample at 90°C for 30 minutes to dehydrate. The oil is cold-pressed hickory oil. After hydraulic pressure, the residual oil in the residual cake is about 20%. Add deionized water according to the material-to-liquid ratio of 1:4 (w / v), stir and disperse in a 1000rpm mixer, remove the residual husk after standing, and adjust the solution to about pH 3.5. Homogenize at 2000rpm for 2 minutes, centrifuge at 3000rpm for 30 minutes, and vacuum-dry the upper oil layer at 90°C for 30 minutes to dehydrate. The calculated total oil yield is about 90%. The cold-pressed hickory oil and the water-extracted oil were tested respectively, and the acid values ​​were 0.21 and 0...

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Abstract

The invention discloses an efficient preparation technology of high-quality hickory nut oil. The technology comprises the following steps that (1) hulled hickory nut seeds are dried at low temperatureof 50-80 DEG C; (2) the hickory nut seeds dried at low temperature are placed into a hydraulic oil press to produce oil, pressing is stopped after the oil yield is 40-60%, the hickory nut oil and residue cakes are collected respectively; (3) deionized water or distilled water is added into the residue cakes at the feed-liquid ratio of 1 to (3-10)w / v, the mixture is standing, and then residual hull is removed; and (4) homogenizing is conducted after the mixed liquid pH value is conditioned to be 3-5 or 8-10, and the homogenized mixed liquid is centrifugated for 10-30 minutes in a centrifugal machine. The efficient preparation technology has the beneficial effects that aiming at oil materials such as hickory nut which is high in oil content and unsaturated fatty acid content, the high-quality hickory nut oil is efficiently prepared by adopting a two-step technology including hydraulic pressing and water extraction on the basis of low temperature drying, the nutrient elements such as vitamins and sterol in grease are not damaged, application of hickory nut protein and hickory nut cakes is facilitated, and the preparation technology has the characteristics of mild condition, low energy consumption, high oil yield, good oil quality and the like.

Description

technical field [0001] The invention relates to edible hickory oil, mainly a high-efficiency preparation process of high-quality hickory oil. Background technique [0002] Pecan (Carya cathayensis sarg) is a plant of the genus Carya Nutt of the family Juglandaceae. Pecan nuts are crispy and delicious, rich in nutrition, and are one of the most valuable varieties in many dried fruits in my country. Pecan nuts are crispy, delicious and nutritious. It is one of the most valuable varieties of dried fruits in my country. , black hair, nourishing qi and nourishing blood, warming the lungs and intestines" and other functions. [0003] Pecan kernels contain a variety of nutrients, among which the oil content is the highest, accounting for 65.8% to 74.1% of the kernel, and the unsaturated fatty acids in oil account for about 88.38% to 95.78%, especially the high content of oleic acid, linoleic acid and linolenic acid . Hickory oil is mainly produced by screw pressing, organic solv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11B1/04C11B1/06C11B3/00
Inventor 方学智杜孟浩郭少海罗凡
Owner RES INST OF SUBTROPICAL FORESTRY CHINESE ACAD OF FORESTRY
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