Preparation method of food standard substance lauric acid

A technology of lauric acid and standard products, which is applied in the field of preparation of food standard lauric acid, which can solve the problems of accuracy impact, environmental pollution, complicated operation, etc.

Inactive Publication Date: 2016-05-11
TIANJIN GUANGFU TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lauric acid is a fatty acid, and its content determination has always been a problem. Generally, it is determined by gas chromatography after methyl esterification (GB / T17377-2008). Because there is a synthesis process of methyl esterification, the accuracy of the measurement is greatly affected. At the same time, the operation is complicated, pollutes the environment, and seriously affects the health of the determination personnel, so it is necessary to study a new, simple and environmentally friendly method for the determination of lauric acid

Method used

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  • Preparation method of food standard substance lauric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A preparation method of food standard product lauric acid, the steps are as follows:

[0019] Take 1Kg of lauric acid with a content of 98%, put it into a melter, install a stirring device, put it in a 60°C water bath, heat it to dissolve it completely, take out the melter, start stirring, and let it cool slowly. When part of the precipitation is observed, the stirring is stopped immediately, and the upper liquid is collected in another melting tube for secondary melting. The remaining solid was removed from the melt and placed in a large beaker for later use. The two molten solids were combined. Wash twice with cold petroleum ether and dry in a vacuum dryer at 30-40°C for 2-3 hours to obtain 750 g of lauric acid with a yield of 75% and a content of 99.0%.

Embodiment 2

[0021] A preparation method of food standard product lauric acid, the steps are as follows:

[0022] Weigh 1.5Kg of industrial lauric acid with a content of 98%, add 2 liters of chromatographic grade hexane, heat to dissolve, boil for 2-3min, filter, put the filtrate in a 5L distillation bottle, recover about 500ml of hexane by distillation, pour it into a beaker, and carry out Cooling, at 20-30°C, crystals are precipitated, washed with cold hexane for 2-3 times, and dried in a vacuum dryer at 30-40°C for 2-3 hours, with a yield of 80% and a content of 99.5%.

[0023] If a product with a higher content is required, the above-mentioned crystallization is then subjected to the above-mentioned secondary crystallization, the content is 99.9%, and the yield is 60%.

Embodiment 3

[0025] The lauric acid of Example 1 grade is crystallized in the first step of Example 2 to obtain 99.9% lauric acid with a yield of 60%.

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Abstract

The invention relates to a preparation method of a food standard substance lauric acid. The method includes the steps of: weighing 98% industrial lauric acid, adding chromatographic grade hexane, conducting heating dissolving, performing boiling for 2-3min, then carrying out filtering, putting the filtrate into a distillation flask, conducting distillation to recover part of the hexane, pouring the product into a beaker to perform cooling, precipitating crystals at 20-30DEG C, washing the crystals with cold hexane 2-3 times, and drying the crystals in a vacuum dryer at 30-40DEG C for 2-3h so as to obtain food standard substance lauric acid with a content of 99.5%. The method provided by the invention purifies industrial grade lauric acid by fusion method and recrystallization method to obtain standard grade lauric acid with a content of 99.5-99.9%, solves the problem of content determination, changes the original method of measuring lauric acid purity by determining the freezing point to direct determination of the lauric acid content by gas chromatography, and establishes determination conditions.

Description

technical field [0001] The invention belongs to the field of food chemistry, in particular to a preparation method of food standard lauric acid. technical background [0002] Lauric acid is a white needle-like crystal with a slight aroma of lauric oil, so it is not only widely used in the production of alkyd resins, wetting agents, detergents, insecticides, and surfactants, but also used as raw materials for food additives and cosmetics And spice industry, pharmaceutical industry. GB2760-1986 stipulates that spices are allowed to be used, and the limit (mg / g) is: soft drinks 65, cold drinks 16, candies 2.4, baked goods 39, puddings 25, oil 3.5, GB2760-1996 also stipulates that the limit for peeling fruits and vegetables is 3.0g / Kg. [0003] In order to ensure food safety, the above products must be strictly controlled. The first task is to determine its content. Lauric acid is a fatty acid, and its content determination has always been a problem. Generally, it is determi...

Claims

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Application Information

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IPC IPC(8): C07C51/43C07C53/126
Inventor 梁玉明李倩
Owner TIANJIN GUANGFU TECH DEV
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