Determination of optimum humidity for air-curing of cigar tobacco leaves during the browning period

Zhao, Songchao; Wu, Zhi‐Yong; Lai, Miao; Zhao, Mingqin; Lin, Beisen

doi:10.1016/j.indcrop.2022.114939

Cited by 26 publications

(27 citation statements)

References 34 publications

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“…In tobacco, PPO mainly exists in chloroplasts ( Lax and Vaughn, 1991 ; Mayer, 2006 ). Previous studies showed that PPO activity positively correlates with the environmental moisture content during tobacco leaf processing ( Song et al., 2010 ; Zhao et al., 2022 ). In our study, the moisture content of tobacco leaves decreased in the following order: CK > stem(+) > stem(-).…”

Section: Resultsmentioning

confidence: 99%

“…The MDA content was enormously higher in stem(-) than in Stem(+) ( Figure 4F ). This is because the dehydration rate was more rapid in stem(-), leading to lower antioxidant enzyme activities and higher ROS accumulation ( Jiang and Huang, 2001 ; Su et al., 2017 ; Zhao et al., 2022 ). Our observation showed that separated leaves (stem(-)) underwent a higher level of membrane lipid peroxidation than leaves with stems (stem(+)) during flue-curing.…”

Section: Resultsmentioning

confidence: 99%

“…They play an essential role in determining the flue-cured tobacco quality, principally the color and aroma of flue-cured leaves and the odor and taste of smoke ( Gong et al., 2006 ; Dagnon et al., 2006 ). During flue-curing of separated top tobacco leaves, however, polyphenols were easily oxidized into quinone by PPO to form brown-colored substances, which cause cured leaf browning and reduce flue-cured tobacco quality ( Chen et al., 2021 ; Zhao et al., 2022 ). In tobacco, polyphenols exist in the form of glucoside and ester ( Romero et al., 2004 ).…”

Section: Resultsmentioning

confidence: 99%

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Widely targeted metabolomics analysis reveals the mechanism of quality improvement of flue-cured tobacco

et al. 2022

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Flue-curing of top leaves with stems is a widely applied curing technology. Owing to the presence of stems, the quality of flue-cured leaves was significantly improved. However, the contribution of stems to flue-cured leaves is still unknown. In this study, the differences in physicochemical properties and metabolomics data between separated leaves (stem(-)) and leaves with stems (stem(+)) were investigated. The metabolic profiling of stem(+) was significantly different from that of stem(-), with phytohormone indole-3-acetic acid (IAA) being one of the most differential metabolites. The presence of stems reduced the rate of water loss in leaves, which led to less ROS accumulation, higher antioxidant enzyme activities and a lower level of membrane lipid peroxidation in stem(+) than in stem(-). The presence of stems also helped maintain the cellular membrane integrity of leaf cells by preventing the accumulation of IAA in leaf cells. Better cellular membrane integrity during flue-curing means a lower risk of leaf browning. In addition, stem(+) had a lower starch content than stem(-) because of a higher level of amylase activity. In summary, these results indicated that the presence of stems caused metabolism changes in leaves, prevented flue-cured leaves from browning and enhanced starch degradation in leaves during flue-curing.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Widely targeted metabolomics analysis reveals the mechanism of quality improvement of flue-cured tobacco

et al. 2022

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“…Wu et al [15] used a deep learning-based method to model of the bulk tobacco flue-curing process. Zhao et al [16] measured the optimum humidity for air-curing of cigar tobacco leaves during the browning period. Wei et al [17] explored the practicability of on-line monitoring of moisture, starch, protein, and soluble sugars for tobacco leaves by near-infrared spectroscopy and deep transfer learning.…”

Section: Introductionmentioning

confidence: 99%

Design and Temperature Modeling Simulation of the Full Closed Hot Air Circulation Tobacco Bulk Curing Barn

2022

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For now, the open humidification method is applied in the tobacco bulk curing barn, which has some disadvantages, such as the loss of the oil content and aroma components of the tobacco leaves and the waste heat loss of the exhaust air flow. In this context, a tobacco bulk curing barn with totally closed hot air circulation is designed to perfect the curing quality of tobacco and avoid the loss of residual heat in the bulk curing barn. Meanwhile, due to the balance and symmetry of input and output of the curing barn temperature, according to the law of conservation of energy, a mathematical model of the temperature control system of the closed hot air circulation tobacco bulk curing barn is established, and the temperature transfer function of the system is obtained. On this basis, 10 algorithms are used to optimize the full closed hot air circulation tobacco bulk curing barn temperature control system PID parameters. The result of the sobol sequence seeker optimization algorithm (SSOA) is better than the other algorithms. So, the PID control strategy based on the SSOA is used to simulate and experiment the temperature control system of tobacco bulk curing barn. The simulation and experimental results show that for the tobacco bulk curing barn temperature control system, the sobol sequence seeker optimization algorithm PID control has better dynamic characteristics compared with fuzzy PID control, and the temperature control system of tobacco bulk curing barn has fast adjustment and small overshoot. Therefore, the new baking barn with proper PID parameters can improve the tobacco’s curing quality and save energy by reducing the residual heat.

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“…During the drying process, the weight of tobacco leaves can be reduced by as much as 85 percent due to the reduction of moisture from the leaves [1]. This is one of the most important steps in tobacco processing because it determines tobacco's colour, taste, and micronutrients [2][3][4][5][6][7]. In Vietnam, tobacco is often dried in manual drying chambers using wood fuel.…”

Section: Introductionmentioning

confidence: 99%

Influences of Loading Density of Tobacco Drying Chamber on Drying Quality

Chuong¹,

Nam²,

Huong³

et al. 2022

IJHT

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Drying is one of the most important steps in tobacco processing because it determines the color, taste, and micronutrients in tobacco. The loading density and the arrangement of tobacco leaves in the drying chamber affect the temperature and humidity distribution of the air, thereby affecting the drying quality. In this paper, three drying cases with different tobacco weights were studied by computational fluid dynamics (CFD) simulation as well as experimental. The results show that when the loading density of the tobacco drying chamber increases, the local resistance of tobacco leaves increases sharply, and the velocity difference and temperature difference of the air in the tobacco drying chamber increases. The maximum temperature difference in the highest loading density reaches 10 K. The uneven temperature distribution of the air reduces the quality of the dried tobacco.

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Determination of optimum humidity for air-curing of cigar tobacco leaves during the browning period

Cited by 26 publications

References 34 publications

Widely targeted metabolomics analysis reveals the mechanism of quality improvement of flue-cured tobacco

Widely targeted metabolomics analysis reveals the mechanism of quality improvement of flue-cured tobacco

Design and Temperature Modeling Simulation of the Full Closed Hot Air Circulation Tobacco Bulk Curing Barn

Influences of Loading Density of Tobacco Drying Chamber on Drying Quality

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