Scientia Agricultura Sinica ›› 2011, Vol. 44 ›› Issue (10): 2013-2021.doi: 10.3864/j.issn.0578-1752.2011.10.006

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY·AGRICULTURE INFORMATION TECHNOLOGY • Previous Articles     Next Articles

Study on Changes of Color Parameters and Pigment Contents in Flue-cured Tobacco Leaves with Different Maturities During Bulk-curing Process

 HUO  Kai-Ling, SONG  Chao-Peng, WU  Sheng-Jiang, LIU  Chuang, HE  Fan, GONG  Chang-Rong   

  1. 1.河南农业大学烟草学院，郑州 450002
  • Received:2010-07-19 Online:2011-05-15 Published:2010-11-03

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Abstract: 【Objective】 Changes of color parameters and pigment contents in flue-cured tobacco leaves with different maturities and their relationships during bulk curing process were studied in order to provide a theoretical basis for optimization and perfection of curing technology.【Method】Automatic color difference meter and spectrophotometer were used to study the color parameters(L*, a*, b*) and chromaticity parameters(△L*, △a*, △b*) , chlorophyll and carotenoid content of unripe, immature, ripe and overripe tobacco leaves during bulk curing process. 【Result】 During bulk curing process, both L* and a* value of flue-cured tobacco leaves of different maturities showed an ascending tendency. The b*value of flue-cured tobacco leaves with four different maturities increased before 48℃, decreased between 48℃ and 54℃, and then rose again slightly. L* value of flue-cured tobacco leaves with four different maturities showed as overripe > ripe > unripe > immature, there was little difference in a* value between four kinds of fresh tobacco leaves, among which high maturity ascended quicker, and b* of flue-cured tobacco leaves showed as immature > unripe > overripe > ripe. △L* values of flue-cured tobacco leaves with four different maturities decreased generally during bulk curing process, △a* increased obviously at 48℃ and △b* reduced, especially unripe and overripe flue-cured tobacco leaves. Correlation analysis showed that there was a significant relationship between carotenoid content and L* value in immature, ripe flue-curing tobacco leaves. Regression equation between L*, a*, b* and pigments in ripe flue-cured tobacco leaves was established during bulk curing process, (r = - 0.979, - 0.851, P < 0.05), carotenoid content was clearly negatively correlated with a* value (r = - 0.832, - 0.853, P < 0.05), which equation between L*, a*, b*and pigments in ripe flue-cured tobacco leaves was, established during bulk-curing process, which respectively were followed as:  = 245.67 x1 + 114.75 x2 - 211.69 x3 - 125.21 x4 + 118.69;  = 416.9 x1 + 369.19 x2 - 404.38 x3 - 78.38 x4 + 43.55;  = - 1051.55 x1 - 1270.02 x2 + 1106.42 x3 + 17.48 x4 + 40.1.【Conclusion】Color values of front and back of flue-cured tobacco leaves with different maturities had similar changing trend during bulk-curing process, color parameters of flue-curing showed a positive correlation with pigment contents, and color parameters could be used as an auxiliary index to judge the maturity of flue-cured tobacco.

Key words: flue-cured tobacco, bulk curing, maturity, color parameters, pigment

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