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Method for measuring freezing points of perfumes, essential oil and composite essential oil

A technology for compounding essential oils and essential oils, applied in transmittance measurement and other directions, can solve the problems of inconvenient observation and reading of temperature, raising or lowering temperature, inaccurate temperature control, etc., and achieves high repeatability, convenient operation and high sensitivity. Effect

Inactive Publication Date: 2015-02-25
GUANGZHOU LONKEY INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) The device is cumbersome: the device for measuring the freezing point includes a 500mL jar, a thick-walled test tube, and a test tube. and a stirrer made of stainless steel wire;
[0005] (2) Inaccurate temperature control: The temperature control of the test device is based on adding water, melting ice or any suitable mixed refrigerant to the jar. It needs to increase or decrease the temperature, and it needs to add water or ice again.
[0006] (3) Inconvenient operation: it is necessary to adjust the temperature, add cooling media such as water or ice, and all need to open the cork or rubber stopper on the jar; when measuring, it is necessary to use manual operation to stir the iron wire continuously, which is difficult for simultaneous observation and It is inconvenient to read the temperature; in addition, the sample needs to be melted again after the initial test and when it needs to be re-measured

Method used

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  • Method for measuring freezing points of perfumes, essential oil and composite essential oil
  • Method for measuring freezing points of perfumes, essential oil and composite essential oil
  • Method for measuring freezing points of perfumes, essential oil and composite essential oil

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1: determination of freezing point of pure rose essential oil

[0029] Put 2mL of the pure rose essential oil sample to be tested into the washed and dried test tube, put it into the stirring magnet, screw on the cock, insert the temperature probe and infrared probe, and put it into the reaction pool of the multi-tube parallel reaction workstation; set the magnet The stirring rate is 1200rpm, and the temperature of the sample is lowered under continuous stirring until crystals are precipitated and the liquid becomes turbid; the temperature is raised slowly and continuously at a heating rate of 1°C / min until the sample becomes completely clear; it is measured by visual observation or according to the turbidity probe The corresponding temperature detected by the temperature probe when the infrared transmittance turns a turning point, so as to obtain the freezing point detection results, the results are shown in Table 1 and figure 1 shown.

Embodiment 2

[0030] Embodiment 2: Determination of the freezing point of compound rose essential oil

[0031] Put 2 mL of the compound rose essential oil sample to be tested into a washed and dried test tube, put it into the stirring magnet, screw on the cock, insert the temperature probe and infrared probe, and put it into the reaction pool of the multi-tube parallel reaction workstation or similar device; The stirring rate of the stator is 1200rpm, and the temperature of the sample is lowered under continuous stirring until crystals are precipitated and the liquid becomes turbid; the temperature is raised slowly and continuously at a heating rate of 1°C / min until the sample becomes completely clear; according to the test results displayed by the instrument, infrared The temperature corresponding to the turning point of the transmittance is the freezing point. The results are shown in Table 1 and figure 2 shown.

[0032] Table 1: the test result of embodiment 1 and embodiment 2

[0033...

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Abstract

The invention provides a method for measuring freezing points of perfumes, essential oil and composite essential oil. The method comprises the following steps: (1) putting a sample of to-be-measured liquid-state perfumes, essential oil or composite essential oil into a test tube which is cleaned and dried, putting a magnetic stirrer into the test tube, inserting a temperature probe into the to-be-measured sample, inserting a turbidity probe into the test tube, sealing the opening of the test tube and putting the test tube into a reaction tank of a multi-tube parallel reaction workstation; (2) starting magnetic stirring, and cooling the to-be-measured sample under continuous stirring until crystals are precipitated in the test tube and the liquid becomes turbid; and (3) slowly and continuously heating until the liquid in the test tube is completely clarified, thereby obtaining a freezing point detection value according to the temperature measured by the corresponding temperature probe when infrared transmittance which is measured by the turbidity probe turns. The method provided by the invention has the characteristics of convenience in operation, easiness in temperature control, accurate and reliable detection result and high sensitivity.

Description

technical field [0001] The invention relates to a method for measuring the freezing points of spices, essential oils and compound essential oils. Background technique [0002] When spices change from liquid to solid at supercooled temperatures and release their latent heat of fusion, the observed constant or maximum temperature is called the freezing point. Freezing point is a useful constant for rating certain substances. The content of main components in some samples is directly related to the freezing point, such as anethole in anise oil, its content can be directly found from the table according to the freezing point. In addition, such as eucalyptol in eucalyptus oil and safrole in sassafras oil can be directly measured by freezing point method. The freezing point value of some synthetic spices can judge the purity of its samples. It can be seen that the freezing point is an important physical constant. [0003] As for the determination method of the freezing point of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/59
Inventor 李新赵建红陈韬陈树旭刘保陈武渊戴殷
Owner GUANGZHOU LONKEY INDAL
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