Method for measuring azalea oil content of aqueous emulsion by using double-wave length spectrophotometry
A spectrophotometry, water emulsion technology, applied in the field of spectral analysis, can solve the problems of long time, cumbersome and so on
Inactive Publication Date: 2011-06-22
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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Problems solved by technology
Usually, the determination method of volatile oil is used to measure the content of rhododendron oil in water emulsion, but this method is cumbersome and takes a long time
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[0036] Determination of Rhododendron oil content in water emulsion:
[0037] Take 50mL of Rhododendron azalea oil-water emulsion, add 36mg of Tween-80 to the Rhododendron rhododendron oil-water emulsion, and stir to fully disperse the rhododendron oil.
[0038] Seal the fully dispersed rhododendron oil-water emulsion sample in a glass bottle, place it in a 40kH, 200W ultrasonic disperser, and ultrasonically disperse for 20 minutes.
[0039] After the ultrasonically dispersed sample was left for 60 minutes, its absorbance at 244 and 220 nm was measured; after measurement, they were 0.409 and 0.820 respectively, and the difference was ΔA=0.411.
[0040] With the difference of absorbance at two wavelengths, through the concentration-absorbance difference standard curve of the above-mentioned rhododendron oil emulsion or the following formula, the rhododendron rhododendron oil in the uniform dispersion prepared after adding Tween-80 is calculated. The content is 0.0321g·L -1 . ...
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The invention discloses a method for measuring the azalea oil content of an aqueous emulsion by using double-wave length spectrophotometry. Firstly, a sample to be tested is added with a emulsifier; sThe invention discloses a method for measuring the azalea oil content of an aqueous emulsion by using double-wave length spectrophotometry. Firstly, a sample to be tested is added with a emulsifier; secondly, the mixture is placed in an ultrasonic cleaner for ultrasonic dispersion first and then a spectrophotometer is used to measure the absorbance of the dispersion at a wavelength of 244 nanometeecondly, the mixture is placed in an ultrasonic cleaner for ultrasonic dispersion first and then a spectrophotometer is used to measure the absorbance of the dispersion at a wavelength of 244 nanometers and the absorbance of the dispersion at a wavelength of 220 nanometers; thirdly, the absorbance difference of the dispersion at the two wavelengths is used to calculate the azalea oil content of thrs and the absorbance of the dispersion at a wavelength of 220 nanometers; thirdly, the absorbance difference of the dispersion at the two wavelengths is used to calculate the azalea oil content of the dispersion containing the emulsifier according to a curve of the concentration of an azalea oil emulsion and the standard of absorbance difference; and finally, the azalea oil content of the aqueouse dispersion containing the emulsifier according to a curve of the concentration of an azalea oil emulsion and the standard of absorbance difference; and finally, the azalea oil content of the aqueousemulsion is obtained through concentration conversion. The method has the advantages of simple and quick analysis means, low cost, accurate measurement, 99.92 percent recovery rate and 0.98 percent d emulsion is obtained through concentration conversion. The method has the advantages of simple and quick analysis means, low cost, accurate measurement, 99.92 percent recovery rate and 0.98 percent deflection relative to the standard.eflection relative to the standard.
Description
technical field [0001] The invention belongs to the technical field of spectral analysis, and relates to a method for the content of rhododendron oil in emulsion, in particular to a method for measuring the content of rhododendron oil in emulsion with a dual-wavelength spectrophotometry. Background technique [0002] Rhododendron azalea belongs to Rhododendronaceae Rhododendron, mainly distributed in Qinghai, Gansu, Shaanxi, Sichuan and other places. The volatile oil contained in the leaves of Rhododendron lanceolata has good curative effect on chronic bronchitis. It has the effects of clearing heat and detoxifying, relieving cough and asthma, relieving spasm and promoting qi, invigorating stomach and reducing swelling. It has low toxicity and few side effects. Savoury rhododendron oil (SRO, hereinafter referred to as rhododendron oil) is extracted from the fresh leaves and twigs of Rhododendron sativa by steam distillation. Using capillary gas chromatography-mass spectrome...
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IPC IPC(8): G01N1/38G01N21/33
Inventor 卿彬菊吴志坚李权叶秀深刘海宁郭敏葛飞
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI