A formulation and method for promoting rapid and uniform yellowing of flue-cured tobacco leaves

Abstract

The application discloses a preparation and a method for promoting fast and uniform yellowing of flue-cured tobacco leaves. The preparation comprises hydrogen peroxide, vitamin C and a solvent. Spraying the preparation on the surface of the tobacco leaves or soaking the tobacco leaves in the preparation can promote fast and uniform yellowing of the tobacco leaves. The application can promote uniform and fast yellowing of post-harvest tobacco leaves, and has the advantages of simple operation, low cost, non-toxicity, no residue, green environmental protection, wide application prospect for improving color and quality of the tobacco leaves, and the like.

Description

Technical Field

[0001] This invention relates to a formulation for promoting the rapid and uniform yellowing of flue-cured tobacco leaves, and also to a method for promoting the rapid and uniform yellowing of flue-cured tobacco leaves, belonging to the field of tobacco processing technology. Background Technology

[0002] Tobacco curing involves placing freshly harvested, mature tobacco leaves in curing barns or similar equipment. By controlling suitable temperature, humidity, wind speed, and time intervals, the tobacco leaves gradually achieve the yellow, bright, and soft characteristics required by the cigarette industry. Quality states such as ripeness and aroma. The curing process is divided into three stages: yellowing stage, color fixing stage, and dry stem stage. The yellowing stage is the key period for leaf senescence, color change, material transformation, and the formation of high-quality tobacco leaves (Gong Changrong et al. Introduction to Three-Stage Curing of Flue-Cured Tobacco. Science Press, 2005, 94-235). If the tobacco leaves do not turn yellow evenly or fail to turn yellow during this stage, it is very easy for the cured tobacco leaves to turn brown, have mixed colors, and be covered with ash, which seriously affects the quality of the tobacco leaves. The ease with which tobacco leaves turn yellow during the curing process is a criterion for judging their ease of curing. It is influenced by a variety of factors, including: variety (Li Xuejun et al. Curing characteristics and curing technology of the middle leaves of the new flue-cured tobacco variety Yu Nongxiang 201. Zhejiang Agricultural Sciences, 2024, 65; Su Jiaen et al. Analysis of the coordination between yellowing and water loss during the yellowing period of different flue-cured tobacco varieties. Hubei Agricultural Sciences, 55(19): 5148-5150), cultivation measures (Yang Shuxun. Research progress on the principle and technology of tobacco curing. Crop Research, 2018, 32(6): 541-544), maturity (Niu Hao et al. Study on the antioxidant capacity and energy metabolism of tobacco leaves at different maturity levels after harvest. China Tobacco Science, 2021, 42(6): 45-52), and curing technology (Niu Hao et al. Effects of different yellowing temperatures on yellowing and energy metabolism of tobacco leaves during curing. Modern Agricultural Science and Technology, 2023, 7: 189-193). However, there is an urgent need for methods or processes to achieve rapid and uniform yellowing during tobacco curing in order to improve and enhance the quality of tobacco leaves.

[0003] Currently, reports indicate that methods such as spraying enzyme preparations (Zhao Qianyi, Min Chen. A tobacco processing technology. Application No.: CN202310722268.5) and improving the temperature, humidity, and CO2 concentration in the curing barn (Han Guangming et al. A high-temperature yellowing, moisturizing, and slow-curing method. Application No.: CN202311336107.9), as well as adjusting the curing temperature and CO2 concentration (Cui Guomin et al. A method to promote rapid and uniform yellowing of flue-cured tobacco leaves. Application No.: CN202211516957.2; Yang Xinling et al. A method to improve the curing quality of tobacco leaves using a CO2 catalyst. Application No.: CN202410409546.6) can effectively shorten the yellowing time of tobacco leaves and promote rapid yellowing. However, these methods are complex to operate and difficult to control and master, resulting in unstable and uneven yellowing of tobacco leaves during the curing process, which prevents their widespread application.

[0004] Therefore, it is of great significance to develop a method that can rapidly promote the yellowing of tobacco leaves in order to improve and enhance the quality of tobacco leaves. Summary of the Invention

[0005] To address the problems of unstable and uneven yellowing of flue-cured tobacco leaves during the curing process, the first objective of this invention is to provide a formulation that promotes rapid and uniform yellowing of flue-cured tobacco leaves. This formulation effectively promotes uniform yellowing of tobacco leaves and is made from environmentally friendly ingredients.

[0006] The second objective of this invention is to provide a method for promoting the rapid and uniform yellowing of flue-cured tobacco leaves. This method is simple, inexpensive, and suitable for industrial application.

[0007] To achieve the above-mentioned technical objectives, the present invention provides a formulation that promotes rapid and uniform yellowing of flue-cured tobacco leaves, comprising hydrogen peroxide, vitamin C, and a solvent.

[0008] The hydrogen peroxide in this invention has strong oxidizing properties, which can promote a chain reaction of membrane lipid peroxidation, disrupt cell membrane integrity, and facilitate the rapid degradation and transformation of pigments in tobacco leaf plastids during the curing process, thus promoting the formation of yellow leaves. Vitamin C is an important antioxidant in plants, which can prevent enzymatic browning after the plasma membrane is damaged, thus preventing leaves from turning yellow. By using these two components in combination, tobacco leaves can be made to turn yellow quickly and evenly during the curing process, improving the color and quality of the tobacco leaves.

[0009] As a preferred embodiment, the solvent is water.

[0010] As a preferred embodiment, the hydrogen peroxide content is 1.95~6.85 g / L. A further preferred content is 3.91~5.87 g / L, and the most preferred content is 4.44~5.38 g / L. Controlling the hydrogen peroxide content within a suitable range is beneficial for improving the formulation's effectiveness. Excessive content can cause rapid yellowing of tobacco leaves and may lead to browning, while insufficient content results in a relatively decreased effect.

[0011] As a preferred embodiment, the hydrogen peroxide is introduced via a hydrogen peroxide solution with a mass concentration of 3% to 30%.

[0012] As a preferred embodiment, the vitamin C content is 10-60 g / L. A further preferred vitamin C content is 20-40 g / L, and the most preferred vitamin C content is 25-35 g / L. Controlling the vitamin C content within a suitable range is beneficial for improving the formulation's effectiveness; excessively high or low content will prevent it from achieving a good synergistic promoting effect with hydrogen peroxide, potentially leading to uneven yellowing.

[0013] The present invention also provides a method for promoting rapid and uniform yellowing of flue-cured tobacco leaves. The method involves spraying the above-mentioned preparation onto the surface of the tobacco leaves, or soaking the tobacco leaves in the above-mentioned preparation, and then curing the tobacco leaves.

[0014] As a preferred embodiment, the formulation is sprayed onto both the front and back surfaces of the tobacco leaves.

[0015] As a preferred embodiment, the soaking temperature is 10~30℃ and the soaking time is 2~3 minutes.

[0016] Compared with the prior art, the effective effects of the present invention are as follows: (1) The preparation for promoting the rapid and uniform yellowing of flue-cured tobacco leaves in this invention is a colorless and transparent liquid with a low concentration of active ingredients. It is harmless to humans and animals, leaves no residue, is green and environmentally friendly, and can be prepared and used immediately, making it convenient to use. (2) The method of promoting rapid and uniform yellowing of flue-cured tobacco leaves is simple and easy to implement. It is only necessary to spray the preparation evenly on the front and back of the tobacco leaves with a sprayer once, or soak the tobacco leaves in the solution, wait for the water on the surface of the leaves to drain and air dry, and then put them into the drying room for drying. This will achieve rapid and uniform yellowing of the tobacco leaves. (3) This invention is suitable for various flue-cured tobacco varieties, such as Da Bai Jin, Yunyan 87 and Xiangyan No. 7, and can also be applied to the treatment of cigars and white tobacco before drying, which can shorten the yellowing time and improve the color and quality of tobacco leaves. Attached Figure Description

[0017] Figure 1This is a comparison chart showing the yellowing effect of tobacco leaves treated with the formulation of the present invention in Example 3 and untreated blank control tobacco leaves.

[0018] Figure 2 This is a comparison chart of the yellowing effect of tobacco leaves treated with the formulation of the present invention and untreated blank control tobacco leaves at the end of the yellowing period during baking, as shown in Example 4.

[0019] Figure 3 This image shows the yellowing effect of tobacco leaves treated with the formulation of Comparative Example 1 at the end of the yellowing process during curing. Detailed Implementation

[0020] The following examples illustrate the invention, but the invention is not limited to these examples. Considering the adverse effects of frequent sampling from the curing barn during tobacco curing, Examples 1-3 do not involve curing treatment. The tobacco leaf samples treated with the formulation of this invention, as well as the untreated blank control tobacco leaf samples, are directly analyzed for yellowing degree according to the evaluation method for curing characteristics of flue-cured tobacco varieties (YC / T 311-2009) formulated by the State Tobacco Monopoly Administration. This yellowing process is the same as the actual yellowing effect of curing.

[0021] Example 1 Based on a dosage of 10 liters, 0.1 liters of commercially available 30% hydrogen peroxide (analytical grade) and 200 grams of vitamin C were weighed and added to 9.9 liters of distilled water. After dissolving and mixing, a compound preparation was obtained. The preparation was placed in a sprayer and sprayed evenly on the front and back of the harvested mature tobacco leaves until dripping water was applied. After the water on the surface of the leaves was drained and air-dried, a dark chamber test was conducted in a dark and sealed environment according to the evaluation method for the curing characteristics of flue-cured tobacco varieties (YC / T 311-2009) formulated by the State Tobacco Monopoly Administration. The degree of yellowing was calculated according to the method of Niu Hao et al. (Niu Hao et al. Study on post-harvest antioxidant capacity and energy metabolism of tobacco leaves at different maturity levels. China Tobacco Science, 2021, 42(6): 45-52). The results were recorded from the day of harvest (day 1) to day 4. The results are shown in Table 1.

[0022]

[0023] CK was the blank control group, and HC was the experimental group sprayed with the preparation of the present invention.

[0024] As shown in Table 1, the white veneer treated with the formulation of this invention turned almost completely yellow by the fourth day (88.46%), while the untreated white veneer control group showed a significantly lower yellowing rate on the fourth day (81.76%). Yunyan 87 treated with the formulation of this invention turned almost completely yellow by the third day (95.16%), while the untreated Yunyan 87 only showed a yellowing rate of 76.32% on the third day.

[0025] Example 2 For a 10-liter dosage, 0.2 liters of commercially available 30% hydrogen peroxide (analytical grade) and 400 grams of vitamin C were weighed and added to 9.8 liters of distilled water. After dissolving and mixing, the compound preparation was obtained. The harvested mature tobacco leaves were soaked in the prepared preparation for 2 minutes, then removed and allowed to drain the water from the leaf surface and air-dry. Then, a dark box test and yellowing degree statistics were carried out according to the method of Example 1. The results are shown in Table 2.

[0026]

[0027] CK was the blank control group, and HC was the experimental group soaked in the preparation of the present invention.

[0028] As shown in Table 2, the white sesame seeds soaked in the formulation of this invention turned almost completely yellow by the fourth day (95.24%), while the untreated white sesame seeds in the control group showed a significantly lower degree of yellowing by the fourth day (89.64%). The Yunyan 87 seeds soaked in the formulation of this invention turned completely yellow by the third day (100%), while the untreated Yunyan 87 seeds showed a significantly lower degree of yellowing by the third day (86.26%).

[0029] Example 3 Based on a dosage of 10 liters, 0.1667 liters of commercially available 30% hydrogen peroxide (analytical grade) and 300 grams of vitamin C were weighed and added to 9.8333 liters of distilled water. After dissolving and mixing, a compound preparation was obtained. Mature tobacco leaves were soaked in the prepared preparation for 3 minutes, then removed and allowed to drain and air-dry. A dark-box test and yellowing degree analysis were then conducted according to the method in Example 1. The results are shown in Table 3.

[0030]

[0031] CK was the blank control group, and HC was the experimental group soaked in the preparation of the present invention.

[0032] As can be seen from the data in Table 3, the white gluten treated with the formulation of this invention turned almost completely yellow by the fourth day (91.13%), while the untreated white gluten in the control group turned significantly less yellow by the fourth day (84.35%). Yunyan 87 treated with the formulation of this invention turned completely yellow by the third day (100%), while the untreated Yunyan 87 only turned yellow by 77.34% by the third day.

[0033] Figure 1 Photos of the yellowing of tobacco leaves on the third day of the experiment are provided. (b) shows Yunyan 87 and Dabaijin tobacco leaves soaked in the formulation of this invention, while (a) shows the untreated Yunyan 87 and Dabaijin blank control group. The images also show that the yellowing of Yunyan 87 tobacco leaves soaked in the formulation of this invention... Figure 1 b) By the third day, all the tobacco leaves had quickly turned yellow, and the color was uniform, with large white veins. Figure 1b) also showed significantly better yellowing than the blank control group ( Figure 1 a).

[0034] Example 4 The mature upper leaves of Xiangyan No. 7 tobacco were sprayed evenly with the formulation prepared in Example 3 until dripping water was applied to both the front and back surfaces. After the water on the leaf surface had drained and the leaves were air-dried, they were placed in a dense curing barn for curing according to the "Technical Specification for Tobacco Curing (GB / T 23219-2008)". Samples were taken at the end of the yellowing stage during curing to observe the yellowing process. The results are shown in […]. Figure 2 .

[0035] from Figure 2 As can be seen, the tobacco leaves of Xiangyan No. 7 sprayed with the formulation of this invention (right) are significantly brighter and more golden than the blank control group (left).

[0036] Comparative Example 1 Based on a dosage of 10 liters, measure 0.3334 liters of commercially available 30% hydrogen peroxide (analytical grade), weigh 700 grams of vitamin C, add 9.6666 liters of distilled water, dissolve and mix well to obtain the compound preparation. Spray the upper mature tobacco leaves of Xiangyan No. 7 evenly with a mist until dripping water, allowing the water on the leaf surface to drain and air dry. Then, place the leaves in a dense curing barn for curing according to the "Technical Specification for Tobacco Curing (GB / T 23219-2008)". Samples are taken at the end of the yellowing stage during curing to observe the yellowing of the tobacco leaves. The results are shown in […]. Figure 3 .

[0037] from Figure 3 It can be seen that preparations containing excessive hydrogen peroxide will cause the leaves of Xiangyan No. 7 tobacco to turn significantly brown.

[0038] In summary, the formulation provided by this invention can promote the rapid and uniform yellowing of flue-cured tobacco leaves, which can greatly improve the efficiency of tobacco leaf preparation and the color and quality of tobacco leaves.

Claims

1. A formulation for promoting rapid and uniform yellowing of flue-cured tobacco leaves, characterized in that: It contains hydrogen peroxide, vitamin C, and a solvent.

2. The formulation for promoting rapid and uniform yellowing of flue-cured tobacco leaves according to claim 1, characterized in that: The solvent is water.

3. A formulation for promoting rapid and uniform yellowing of flue-cured tobacco leaves according to claim 1 or 2, characterized in that: The hydrogen peroxide content is 1.95~6.85 g / L.

4. The formulation for promoting rapid and uniform yellowing of flue-cured tobacco leaves according to claim 3, characterized in that: The mass content of the hydrogen peroxide is 4.44 g to 5.38 g / L.

5. A formulation for promoting rapid and uniform yellowing of flue-cured tobacco leaves according to claim 1 or 2, characterized in that: The vitamin C content is 10~60g / L.

6. The formulation for promoting rapid and uniform yellowing of flue-cured tobacco leaves according to claim 5, characterized in that: The vitamin C content is 25~35g / L.

7. A method for promoting rapid and uniform yellowing of flue-cured tobacco leaves, characterized in that: The preparation described in any one of claims 1 to 6 is sprayed onto the surface of tobacco leaves, or the tobacco leaves are soaked in the preparation described in any one of claims 1 to 6 and then the tobacco leaves are roasted.

8. The method for promoting rapid and uniform yellowing of flue-cured tobacco leaves according to claim 7, characterized in that: The formulation is sprayed onto both the front and back surfaces of the tobacco leaves.

9. A method for promoting rapid and uniform yellowing of flue-cured tobacco leaves according to claim 7 or 8, characterized in that: The soaking temperature is 10~30℃, and the soaking time is 2~3 minutes.

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