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Structure lipid prepared from modified cottonseed oil fractionation product and preparation method thereof

A technology of structural lipids and cottonseed oil, which is applied in the field of physical and chemical properties, can solve the problems of poor fluidity of oil products, affect the edible performance of cottonseed oil, and is not easy to store, and achieve the improvement of physical and chemical indicators, the reduction of glyceride content, and the long-chain saturated fatty acids The effect of content reduction

Active Publication Date: 2014-04-23
HUNAN AGRICULTURAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The relatively high content of long-chain saturated fatty acid esters in cottonseed oil (palmitic acid 21.6-24.8%, stearic acid 1.9-2.4%) will precipitate from the oil during low-temperature storage, resulting in poor fluidity of the oil and difficult storage, thus Affect the Edible Properties of Cottonseed Oil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh 200kg cottonseed oil fractionation product, add caprylic acid as substrate (the molar ratio of octanoic acid and cottonseed oil fractionation product is 4:1), then add the immobilized lipase Lipozyme RM IM that is 10% of substrate weight, stir at constant temperature to make it Fully react, set the reaction temperature to 80°C, the reaction time to 14h, and the stirring speed to 100r / min. Put it in a centrifuge to remove the lipase in the lower layer, take the upper layer (oil sample) and extract it in n-hexane, measure its acid value, neutralize the free acid with a corresponding concentration of sodium hydroxide-ethanol aqueous solution according to the acid value, stir to make it Blend until the acid value is ≤0.30mg / g, separate the n-hexane layer and conduct vacuum constant temperature evaporation, set the evaporation temperature to 75°C, evaporate until the residual n-hexane solution is lower than 50ppm, stop evaporation when the water content is lower than 0....

Embodiment 2

[0017] Weigh 200kg of cottonseed oil fractionation product, add caprylic acid as substrate (the molar ratio of caprylic acid to cottonseed oil fractionation product is 4.5:1), then add immobilized lipase Lipozyme RM IM with 12% of substrate weight, stir at constant temperature to make it fully For the reaction, set the reaction temperature to 74° C., the reaction time to 15.5 hours, and the stirring speed to 90 r / min. Put it in a centrifuge to remove the lipase in the lower layer, take the upper layer (oil sample) and extract it in n-hexane, measure its acid value, neutralize the free acid with a corresponding concentration of sodium hydroxide-ethanol aqueous solution according to the acid value, stir to make it Blend until the acid value is ≤0.30mg / g, separate the n-hexane layer and conduct vacuum constant-temperature evaporation, set the evaporation temperature to 70°C, evaporate until the residual n-hexane solution is lower than 50ppm, stop evaporation when the water content...

Embodiment 3

[0019] Weigh 500kg of cottonseed oil fractionation product, add caprylic acid as substrate (the molar ratio of caprylic acid to cottonseed oil fractionation product is 5:1), then add immobilized lipase Lipozyme RM IM with 14% of substrate weight, and stir at constant temperature to make it fully For the reaction, set the reaction temperature to 70° C., the reaction time to 16 hours, and the stirring speed to 110 r / min. Put it in a centrifuge to remove the lipase in the lower layer, take the upper layer (oil sample) and extract it in n-hexane, measure its acid value, neutralize the free acid with a corresponding concentration of sodium hydroxide-ethanol aqueous solution according to the acid value, stir to make it Blend until the acid value is ≤0.30mg / g, separate the n-hexane layer and conduct vacuum constant temperature evaporation, set the evaporation temperature to 80°C, evaporate until the residual n-hexane solution is less than 50ppm, stop evaporation when the water content...

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Abstract

The invention discloses a structure lipid prepared from a modified cottonseed oil fractionation product and a preparation method of the structure lipid. The method comprises the following steps: selecting a product obtained from machined and fractionated cottonseed oil, that is, glyceride with high melting point greater than 35 DEG C, as a raw material, performing enzymatic acidolysis ester exchange on the cottonseed oil fractionation product, centrifuging, deacidifying by using an alkali liquid, extracting by using n-hexane, and evaporating in vacuum at constant temperature so as to prepare the structure lipid with the melting point lower than 6 DEG C. Not only is the cottonseed oil resource reasonably and sufficiently utilized, that is, the nutrient structure lipid which contains 41-49% of octylic acid, 28-35% of linoleic acid, 8-11% of oleic acid, less than 15% of saturated fatty acid with high melting point and which is greatly improved in physicochemical properties when being compared with the conventional structure lipid, is prepared, but also the scientific additional values of a cottonseed oil byproduct are greatly increased.

Description

technical field [0001] The present invention relates to a kind of structural lipid prepared by modification of the cottonseed oil fractionation product, and also relates to the preparation method of the structured lipid, specifically changing the fatty acid structure composition of the cottonseed oil fractionation product itself through enzymatic acidolysis, Thereby improving its melting point and other physical and chemical properties. Background technique [0002] Due to the short domestic cottonseed industry chain, most enterprises directly put the by-products into demand without further processing. The relatively high content of long-chain saturated fatty acid esters in cottonseed oil (palmitic acid 21.6-24.8%, stearic acid 1.9-2.4%) will precipitate from the oil during low-temperature storage, resulting in poor fluidity of the oil and difficult storage, thus Affect the edible performance of cottonseed oil. International oil biomodification technology based on microbia...

Claims

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Application Information

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IPC IPC(8): A23D9/04C11B3/00C11B3/06C12P7/64
Inventor 李宗军黄璜李珂
Owner HUNAN AGRICULTURAL UNIV
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