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Iodine value absorbance measurement method for judging quality of aged tobacco leaves

A technology of absorbance and tobacco leaves, which is applied to the measurement of color/spectral characteristics, etc., can solve the problems of large human factors in the measured value and difficulty in judging the titration end point, etc., and achieve the effect of accurate and reliable measurement data, strong repeatability and good correspondence

Inactive Publication Date: 2013-04-24
HUBEI CHINA TOBACCO IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method of determining iodine value uses Na 2 S 2 o 3 Titration method, consumes Na through the reaction solution 2 S 2 o 3 To determine the ability of tobacco leaves to fix oxygen, that is, the degree of alcoholization of tobacco leaves, due to the influence of tobacco leaf pigment and background color, it is often difficult to judge the titration end point, and the measured value has a large human factor

Method used

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  • Iodine value absorbance measurement method for judging quality of aged tobacco leaves
  • Iodine value absorbance measurement method for judging quality of aged tobacco leaves
  • Iodine value absorbance measurement method for judging quality of aged tobacco leaves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: Quality of flue-cured tobacco leaves of five aging times in Qujing, Yunnan

[0033] The tobacco leaves are five-year flue-cured tobacco from 2004 to 2008 in the Qujing area of ​​Yunnan Province, with an aging time of 5 to 1 year, and the grades of the tobacco leaves are all middle tobacco CLF. It was measured by the following method.

[0034] (1) Preparation of water filtrate of aged tobacco leaves: dry and pulverize the tobacco leaves and sieve 60 mesh, boil in distilled water for 20min to obtain CO2-free 2 For distilled water, take 1 g of pulverized tobacco powder, and add 10 g of CO2-free distilled water according to the ratio of tobacco leaf: water weight ratio of 1:10. Oscillate evenly for 20 minutes under the conditions of an oscillation speed of 120 rpm and an oscillation temperature of 25° C., and obtain the water filtrate of aged tobacco leaves by suction filtration.

[0035] (2) Pre-measurement treatment: Take 1ml of the water filtrate of aged tob...

Embodiment 2

[0042] Example 2: Quality of Flue-cured Tobacco Leaf at Three Aging Times in Enshi, Hubei

[0043] The tobacco leaves are flue-cured tobacco of three years in Enshi, Hubei Province in 2006, 2007, and 2008. The aging time is three years, two years, and one year respectively. The tobacco leaves are all central tobacco, and the grades are all C2F. It was measured by the following method.

[0044] (1) Preparation of the water filtrate of aged tobacco leaves: dry the tobacco leaves, crush them, and sieve them to 90 meshes, boil them in distilled water for 40 minutes to obtain CO2-free 2 For distilled water, take 5 g of pulverized tobacco powder, and add 250 g of CO2-free distilled water according to the ratio of tobacco leaves: water weight ratio of 1:50. Shake evenly for 30 minutes, the shaking conditions are shaking speed of 180 rpm, shaking temperature of 30°C, and suction filtration to obtain the water filtrate of aged tobacco leaves.

[0045] (2) Pre-measurement treatment: G...

Embodiment 3

[0052] Example 3: Burley Tobacco Leaf Quality of Three Aging Times in the United States

[0053] The tobacco leaves are flue-cured tobacco from the United States in 2003, 2005, and 2006. The aging time is six years, four years, and three years respectively. The tobacco leaves are all central tobacco, and the grade is SC3F. It was measured by the following method.

[0054] (1) Preparation of aged tobacco water filtrate: dry aged tobacco leaves, pulverize, sieve 100 mesh, boil in distilled water for 60min to obtain CO2-free 2 Distilled water, take 6g of pulverized tobacco powder, and add 480g of CO2-free distilled water according to the ratio of tobacco leaves: water weight ratio of 1:80. Oscillate evenly for 50 minutes under the conditions of an oscillating speed of 200 rpm and an oscillating temperature of 37° C., and obtain the water filtrate of aged tobacco leaves by suction filtration.

[0055] (2) Pre-measurement treatment: Get 5ml of the water filtrate of aged tobacco l...

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Abstract

The invention discloses an iodine value absorbance measurement method for judging the quality of aged tobacco leaves and belongs to the technical field of measurement of the quality of the tobacco leaves. The iodine value absorbance measurement method for judging the quality of the aged tobacco leaves is sequentially carried out according to the following steps of: (1) preparing water filtrate ofthe aged tobacco leaves; (2) processing before measuring; (3) diluting a sample and measuring absorbance, i.e. taking test solution to be measured and background test solution which have the same diluted times and measuring the absorbance at the position with the wavelength of 480 to 485nm; and (4) calculating an iodine value absorbance value, i.e. subtracting the absorbance of the test solution to be measured from the absorbance of the background test solution with the same diluted times with the test solution to be measured to obtain the iodine value absorbance of the aged tobacco leaves ofthe test solution to be measured. Data measured by the method disclosed by the invention is accurate and reliable. The method disclosed by the invention has strong repeatability and small personal error. The correspondence of the obtained data to the quality of the tobacco leaves is high. The obtained data can really reflect the quality data of the aged tobacco leaves.

Description

technical field [0001] The invention belongs to the technical field of tobacco leaf quality measurement, and in particular relates to an iodine value absorbance measurement method for judging the aging quality of tobacco leaves by the level of iodine value content in tobacco leaves. Background technique [0002] The original tobacco still has various defects in quality, such as rough aroma, heavy green and earthy smell, strong irritation, spicy taste, astringent tongue, not delicate smoke, and poor color and flammability of tobacco leaves. To meet the processing requirements and other shortcomings, it must be aged to promote the transformation of the internal chemical components of the tobacco leaves. The alcoholization process of tobacco leaves is one of the main links necessary for cigarette production. The quality of tobacco leaf alcoholization directly affects the quality of cigarette products. The aging process of tobacco leaves is a stage in which macromolecular starch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31
Inventor 李琳何结望吴风光冀志霞闫铁军谢豪刘洋陈守文
Owner HUBEI CHINA TOBACCO IND
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