Time filter

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Kong H.,China Tobacco Guangdong Industrial Co. | Wu J.,China Tobacco Guangdong Industrial Co. | Shen G.,China Tobacco Guangdong Industrial Co.
Tobacco Science and Technology | Year: 2016

In order to accurately determine the particle size distribution in mainstream cigarette smoke aerosol, a dilution system, which was composed of a diverter, an axial diluter and a 20 times jet-flow diluter, and the corresponding detection method for electrical low pressure impactor (ELPI) instrument were established. The experimental results indicated that: 1) The dilution system met the requirements of ELPI for detection stability and instrument detection limits in the determination of mainstream cigarette smoke aerosol. 2) The influence of test time on the test results was minor when detecting smoke aerosol with this ELPI-based method, and the inter-assay relative standard deviation (RSD) was less than 10%. 3) This method featured a good stability, and RSDs of determination results of total mass numbers of aerosol were less than 15%. This method was found to be accurate, stable, reliable and suitable for determining the aerosol particles in smoke of cigarettes with different tar deliveries. © 2016, Editorial Office of Tobacco Science and Technology. All right reserved.


Shi W.,China Tobacco Guangdong Industrial Co. | Hu J.,China Tobacco Guangdong Industrial Co. | Li F.,China Tobacco Guangdong Industrial Co.
Tobacco Science and Technology | Year: 2016

In order to accurately determine the contents of oxalate, succinate, sulfate and phosphate in reconstituted tobacco, the effects of water, sodium hydroxide solution and different concentration methanesulfonic acid (MSA) solution on the extraction efficiency of the above four acidic anions were studied. A method for the quantification of the four acidic anions was developed with ion chromatography, and the amounts of the four acidic anions in 26 samples of reconstituted tobacco were determined. The results showed that: 1) The extraction efficiency of each tested component was more than 99.7% with 40 mmol/L MSA as extraction solution. 2) The recoveries of the four acidic anions ranged from 99.3% to 106.2% and the relative standard deviations were from 0.27% to 0.99%. The method is accurate, simple, reliable and suitable to determine the levels of oxalate, succinate, sulfate and phosphate in reconstituted tobacco. © 2016, Editorial Office of Tobacco Science and Technology. All right reserved.


Zhong L.,China Tobacco Guangdong Industrial Co.. | Liao Y.,China Tobacco Guangdong Industrial Co..
Tobacco Science and Technology | Year: 2015

The shaping device in CH over wrapper is not able to match cigarette packets with special shape, therefore a device for shaping six sides of special cigarette packet was designed. The control system of the designed device was composed of a PLC, four two-position five-way solenoid valves and a three-position four-way manual valve. Heaters driven by cylinders heated the film wrapping on the six sides of a packet. The results showed that the film heating and shaping was automatically completed, the shaping efficiency was improved, the film wrinkling or loosely wrapping packet was eliminated, and the rejected defective packets decreased from 27 to 4 packet/shift. ©, 2015, Editorial Office of Tobacco Science and Technology. All right reserved.


Huang Y.,China Tobacco Guangdong Industrial Co. | Hu J.,China Tobacco Guangdong Industrial Co.
Chinese Journal of Chromatography (Se Pu) | Year: 2010

A method for simultaneous analysis of 20 free amino acids in tobacco was developed using liquid chromatography-electrospray ionization/ion trap tandem mass spectrometry (LC-ESI-IT-MS/MS). Tobacco samples were extracted and filtered, and analyzed without derivatization or solid phase extraction. The LC separation was carried on a reversed-phase HyPURITY C l8 column (200 mm × 2. 1 mm, 5 μm) with the mobile phase of 1% (v/v) acetonitrile/water solution containing 0. 1% nonafluoropentanoic acid and 90% acetonitrile/water solution containing 0. 1% nonafluoropentanoic acid in gradient mode. The results showed that the limits of detection (LODS) of 20 amino acids were in the range of 0. 01-0. 05 μmol/L (S/N = 3), the linear correlation coefficients were above 0. 997 7 in all cases, and the relative standard deviations (RSDs) of peak areas of the extracted ion chromatograms were in the range of 0. 78%-4. 93%. The developed method is of good efficieney, sensitivity and selectivity, and has been success-fully applied to determine the free amino acids in varieties of tobacco samples.


Patent
China Tobacco Guangdong Industrial Co. | Date: 2013-11-20

Disclosed is a method for determining pectin content in a plant sample, comprising the following steps: 1) adding an acidic alcohol solution to the plant sample, then heating the resulting mixture to reflux in a water bath, followed by a first filtration; 2) soaking the filtered residue obtained from the first filtration with an acidic solution, then heating the resulting mixture to reflux in a water bath, followed by a second filtration, then bringing to volume after cooling, obtaining filtrate for later use; 3) adding an acetic acid/sodium acetate buffer solution to treat the filtered residue obtained from the second filtration, then adding a pectinase solution and heating the resulting mixture under vibration in a water bath, followed by a third filtration to obtain a filtrate for later use; 4) sequentially adding an acetic acid/sodium acetate buffer solution and a pectinase solution to the filtrate obtained in step 2) and heating the resulting mixture under vibration in a water bath to obtain an enzymatic hydrolysate, then adding the filtrate obtained in step 3) to the enzymatic hydrolysate followed by bringing to volume, obtaining a test solution; and 5) drawing the test solution into a continuous flow analyzer to perform analysis. The method disclosed has the advantage of providing accurate analysis results.


The present invention discloses a method for quick and simultaneous determination of 16 inorganic anions and organic acids in tobacco by ion chromatography The retention behavior of inorganic anions and organic acids on the anion exchange column was investigated using potassium hydroxide produced by EGC-II KOH eluent autogenerator as eluent. The optimized gradient elution condition was obtained. The samples were prepared through extraction, filtration and dilution before analysis. The separation was performed on an anion exchange column. The time of the gradient elution program was 50 mins. Under the optimized conditions, the calibration of peak area for all the analytes were linear in the ranges of 10^(5). The method in the present invention has the advantadges of simplicity, rapidity and accuracy, and is able to simultaneously determine 16 inorganic anions and organic acids in tobacco by one single time of injection.


Patent
China Tobacco Guangdong Industrial Co. | Date: 2011-12-12

Disclosed is a method for determining pectin content in a plant sample, comprising the following steps: 1) adding an acidic alcohol solution to the plant sample, then heating the resulting mixture to reflux in a water bath, followed by a first filtration; 2) soaking the filtered residue obtained from the first filtration with an acidic solution, then heating the resulting mixture to reflux in a water bath, followed by a second filtration, then bringing to volume after cooling, obtaining filtrate for later use; 3) adding an acetic acid/sodium acetate buffer solution to treat the filtered residue obtained from the second filtration, then adding a pectinase solution and heating the resulting mixture under vibration in a water bath, followed by a third filtration to obtain a filtrate for later use; 4) sequentially adding an acetic acid/sodium acetate buffer solution and a pectinase solution to the filtrate obtained in step 2) and heating the resulting mixture under vibration in a water bath to obtain an enzymatic hydrolysate, then adding the filtrate obtained in step 3) to the enzymatic hydrolysate followed by bringing to volume, obtaining a test solution; and 5) drawing the test solution into a continuous flow analyzer to perform analysis. The method disclosed has the advantage of providing accurate analysis results.


The present invention discloses a method for quick and simultaneous determination of 16 inorganic anions and organic acids in tobacco by ion chromatography The retention behavior of inorganic anions and organic acids on the anion exchange column was investigated using potassium hydroxide produced by EGC-II KOH eluent autogenerator as eluent. The optimized gradient elution condition was obtained. The samples were prepared through extraction, filtration and dilution before analysis. The separation was performed on an anion exchange column. The time of the gradient elution program was 50 mins. Under the optimized conditions, the calibration of peak area for all the analytes were linear in the ranges of 10^(5). The method in the present invention has the advantadges of simplicity, rapidity and accuracy, and is able to simultaneously determine 16 inorganic anions and organic acids in tobacco by one single time of injection.


Trademark
China Tobacco Guangdong Industrial Co. | Date: 2012-03-28

Cigarettes; Cigarettes containing tobacco substitutes not for medical purposes; Tobacco.


Trademark
China Tobacco Guangdong Industrial Co. | Date: 2011-06-14

Tobacco; Cigarettes containing tobacco substitutes not for medical purposes; Cigarettes; Cigarette cases; Cigarette holders; Ashtrays for smokers; Tobacco jars; Lighters for smokers, namely cigarette lighters, not for automobiles; Cigarette filters; Cigarette paper.

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