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Effects of packaging materials and storage conditions on the natural aging of flue-cured tobacco (Part 2)

2.2.2 effects of storage conditions on the chemical composition of Fujian z-piece tobacco during the aging process

during the aging process, the change trends of reducing sugar, nicotine, volatile alkali and volatile acid contents of Fujian z-piece tobacco under different storage conditions are shown in Figure 5, Figure 6, Figure 7 and figure 8 respectively

it can be seen from Figure 5 that under different storage conditions, there are certain differences in the change trend of reducing sugar in the aging process of Fujian z-piece tobacco. Before October 2000, the content of reducing sugar in treatment 1 was significantly higher than that in treatment 2 and treatment 3, and the reduction of reducing sugar content was small; In treatment 2 and treatment 3, the reducing sugar content of each sample is close, and the reducing sugar content decreases significantly in the early stage of alcoholization, while with the progress of alcoholization, the reducing sugar content decreases

it is possible that there is a certain difference in the quality of samples taken each time, and there is no consistent rule for the change of nicotine content in the aging process of Fujian z-piece tobacco stored under different conditions

it can be seen from Figure 7 that with the progress of alcoholization, the volatile alkali content of Fujian z-piece tobacco in treatment 1 decreased slightly lower than that in treatment 2 and treatment 3, while the volatile alkali content of Fujian z-piece tobacco in treatment 3 decreased significantly in the early stage of alcoholization (before October 1999); After one year of alcoholization, the change curve of volatile alkali content of treatment 2 and treatment 3 is close, and the decline range is slightly higher than that of treatment 1. It shows that the storage conditions with low temperature and high humidity are not conducive to the reduction of volatile alkali content, while slightly higher temperature is conducive to the degradation of volatile alkali

it can be seen from figure 8 that before July 2000, there was little difference in volatile acid content between different treatments. From July 2000 to July 2001, the volatile acid content of treatment II still showed a slow increasing trend, and the volatile acid content of the last sample taken in October 2001 increased more; In treatment 1, the volatile acid content of samples taken in October 2000 was significantly lower than that in July 2000, which may be caused by the differences between samples. The volatile acid content of samples taken in April 2001 was still significantly higher than that of samples taken in July 2000; In treatment 3, the volatile acid content showed an irregular upward trend after July 2000. The volatile acid content of the last sample taken in October 2001 increased more. The storage conditions have no obvious effect on the change of pH value during the aging process, and the change trend of pH value of the three treated test pieces is basically the same during the aging process

2.3 effects of packaging materials and storage conditions on the smoking quality of tobacco during aging

during the aging process, the smoking quality of tobacco has also changed greatly due to a series of changes in chemical composition and appearance. The changes of smoking quality are mainly manifested in the improvement of aroma quality, the increase of aroma quantity, the decrease of strength and concentration, the reduction of miscellaneous gas, the reduction of irritation, and the more comfortable taste. During the aging process, the flammability also changed. With the aging process, the flammability increased. However, since the flammability of tobacco leaves is not the limiting factor of tobacco quality at present, the change of flammability will not be considered when studying the influence of packaging materials and storage conditions on the aging quality of tobacco leaves. In order to better show the change law of smoking quality of the tested piece of tobacco during the aging process, after the panel discussion of the judges of Zhengzhou Tobacco Research Institute, it was decided to combine the aroma quality and aroma amount into aroma, the aftertaste and irritation into taste, and the strength and concentration into concentration. The smoking quality of the piece of tobacco was expressed in terms of aroma, taste, concentration, industrial structure adjustment, transformation and upgrading degree, and miscellaneous gas

see Table 5 for the influence of packaging materials on the smoking quality of tobacco during aging. It can be seen from table 5 that packaging materials have a great impact on the smoking quality of cigarettes during the aging process. Kraft paper packaging is conducive to the increase of aroma and the improvement of aroma quality. From the second sampling to the tenth sampling, except for the fifth sampling, the aroma score of kraft paper packaged cigarettes is higher in each sampling, and kraft paper packaged cigarettes maintain a high aroma concentration for a long time. The effect of kraft paper packaging on the taste is better than that of plastic bag packaging, which is less irritating. From the second sampling to the tenth sampling, except for the seventh sampling, the taste score of flakes packaged in plastic bag is slightly higher than that of kraft paper packaging, the other eight sampling are all kraft paper packaging. Packaging materials have little effect on the concentration, and the concentration score difference between the two kinds of packaging cigarettes sampled each time is very small. Packaging materials also have a certain impact on the miscellaneous gas. In the early and middle stages of aging (before April 2001), the miscellaneous gas score of plastic bag packaged cigarettes is slightly higher than that of kraft paper packaging, while in the late stage of aging (after April 2001), the miscellaneous gas score of plastic bag packaged cigarettes is slightly lower than that of kraft paper packaging. From the corrected smoking evaluation score, from the second sampling to the tenth sampling, the second sampling (April 1999), the fifth sampling (April 2000), and the seventh sampling (October 2000), the smoking evaluation score of sheet cigarettes packaged in plastic bags is slightly higher than that of kraft paper, and the smoking evaluation score of sheet cigarettes packaged in kraft paper is higher than that of plastic bags in the other several times. In the process of aging, the smoking quality of kraft paper packaged tobacco is in a higher state for a longer time than that of plastic bag packaged tobacco. In general, kraft paper packaging is more beneficial to the aging of tobacco

see Table 6 for the influence of storage conditions on the smoking quality of Fujian z-cigarette during aging. It can be seen from table 6 that the storage conditions have a great impact on the smoking quality of tobacco during the aging process. Treatment I is not conducive to the increase of aroma and the improvement of aroma quality. From the second sampling to the tenth sampling, except for the fifth sampling, the rest of the samples taken on the top half of the page each time can be input into the experiment. The aroma score of treatment I is low; The aroma scores of treatment two and treatment three were close, but the aroma scores of treatment three were slightly higher. The effect of treatment 2 and treatment 3 on the taste was better than that of treatment 1, which showed that the irritation decreased significantly. From the second sampling to the tenth sampling, the taste score of treatment 1 was lower in each sampling; In the early stage of aging (before April 2000), the taste score of treatment 2 was lower than that of treatment 3, while in the late stage of aging (after April 2000), the taste score of treatment 2 was higher than that of treatment 3; Storage conditions also have a great impact on the concentration. The concentration of treatment 1 decreases significantly, followed by treatment 2, and the concentration of treatment 3 decreases slightly. Storage conditions also have a certain impact on the miscellaneous gas. In the whole process of alcoholization, the miscellaneous gas scores of treatment three are higher than those of treatment one and treatment two; For treatment 2 and treatment 1, in the early and middle stage of aging (before April 2001), the score of impurity gas in treatment 2 is lower than that in treatment 1, while in the late stage of aging (after April 2001), the score of impurity gas in treatment 2 is higher than that in treatment 1, indicating that treatment 3 (higher temperature) is more conducive to the improvement of impurity gas. From the corrected aspiration scores, from the second sampling to the tenth sampling, except for the fifth (April, 2000) and sixth (July, 2000) sampling, the aspiration scores of the samples taken from treatment I are higher than those of treatment II and treatment III, the rest are that the aspiration scores of the samples from treatment I are lower, and the aspiration scores of treatment II and treatment III are relatively close. It shows that the treatment of three pairs of tobacco is more beneficial to the aging, followed by treatment two, and firmly focus on the high-efficiency, low toxicity and harmless treatment one, which is not conducive to the aging of tobacco

3 conclusion and discussion

3.1 packaging materials have a great impact on the appearance quality, chemical composition and smoking quality of Fujian so alcoholization process. Kraft paper packaging is more conducive to the improvement and stability of appearance quality than plastic bag packaging, which shows that the aroma of kraft paper packaged tobacco is exposed earlier than that of plastic bag packaged tobacco, and the aroma stability is good; Kraft paper packaging is more conducive to the maintenance and stability of color. With the aging process, the color of cigarettes packaged in plastic bags turns dark obviously, while the color change range of cigarettes packaged in kraft paper is smaller than that of cigarettes packaged in plastic bags. The two packaging materials have a significant impact on the chemical composition of tobacco during the aging process. In the case of plastic bag packaging, the reduction sugar content decreases significantly, while in the case of kraft paper packaging, the reduction sugar content decreases slightly; Kraft paper packaging is more conducive to the degradation of nicotine and volatile alkali; The packaging materials have little effect on the pH value of the aqueous extract of cigarette smoke in the alcoholization process; Packaging materials have a greater impact on the volatile acid content in the aging process, and the volatile acid content of plastic bag packaging tobacco increased significantly. Packaging materials have a great impact on the smoking quality of tobacco during the aging process. In general, kraft paper packaging is more beneficial to the aging of tobacco. The smoking quality of kraft paper packaged tobacco during the aging process is significantly longer than that of plastic bag packaged tobacco

3.2 packaging materials have a greater impact on the aging of tobacco. Kraft paper packaging is more conducive to the aging of tobacco than plastic bag packaging. The reason why the two kinds of packaging have a significant impact on the aging of cigarette lies in the difference of air permeability conditions between the two kinds of packaging. At present, most cigarettes in China are packed in cartons, and a few places are packed in plastic bags with plywood. The cost of plastic bag packaging is low, but it does have a negative impact on the natural aging of cigarettes. Although the cost of kraft paper packaging is slightly higher than that of plastic bags, it is far lower than that of carton packaging. It is suggested that enterprises that use plastic bags to pack cigarettes change the packaging materials and replace plastic bags with kraft paper packaging

3.3 Fujian z-piece tobacco stored under different conditions has obvious differences in the appearance quality during aging. The appearance quality of treatment 1 is poor, the lack of oil storage in treatment 2 C tank has little difference with that of treatment 3, and the appearance quality of treatment 3 is slightly better than that of treatment 2. It shows that the relative humidity has a great impact on the appearance quality, and higher relative humidity is unfavorable to the aging of tobacco. Storage conditions have a great influence on the conventional chemical components of tobacco during the aging process. The reducing sugar content of treated tobacco decreased slightly. Storage conditions have a great impact on the volatile alkali content, and treatment I is not conducive to the reduction of volatile alkali content. Storage conditions also have a certain impact on the content of volatile acid. Before July 2000, there was little difference in the content of volatile acid between different treatments; After July, 2000, the volatile acid content of tobacco leaves varied greatly among different treatments. The volatile acid content of samples sampled three times after treatment 1 was significantly higher than that of treatment 2 and treatment 3. Storage conditions have a great impact on the smoking quality of tobacco during the aging process. Treatment I (slightly lower temperature and higher relative humidity) is not conducive to the improvement of smoking quality of tobacco, while treatment III (higher temperature and appropriate relative humidity) is more conducive to the improvement of smoking quality of tobacco

3.4 storage and aging of tobacco leaves

the storage conditions of tobacco leaves have a great impact on the aging of tobacco leaves. Higher relative humidity is not conducive to the aging of tobacco leaves, while the warehouse conditions with higher temperature and appropriate relative humidity are more conducive to the aging of tobacco leaves. There has always been a big misunderstanding in the storage and management of tobacco leaves. It is believed that high temperature tobacco leaves are prone to insects and mildew, which is detrimental to the storage of tobacco leaves. In fact, the mildew of tobacco leaves is mainly related to the relative humidity. As long as the relative humidity of the warehouse is controlled below 65%, the tobacco leaves are impossible to mildew. This gives us an enlightenment: when formulating the storage principles of tobacco leaves, tobacco leaves with good quality should be stored in warehouses with appropriate relative humidity, and warehouses with poor warehouse conditions and difficult relative humidity control can only store low-grade tobacco with poor quality

3.5 temperature and humidity management of warehouse and tobacco alcohol